The transformer in flux current may be a transient current that happens in
electrical devices has been charged. This current depends on completely
different parameters probably the voltage magnitude, the switching on angle
the permanent flux, the core physical phemeon characteristics, the primary
circuit resistance, etc. To beat the issues arising owing to transients, these are
required to be suppressed.In this paper, an easy and economical techniquie is
conferred to limit the transient current of the Y-yg transformers. One
amongst the most benefit of this technique is it doesn’t would like any
negative feedback circuit or activity unit. The tactic relies on a three-phase
thyristors bridge single RL reactor with the individual phases of electrical
device. Since the amount of thyristors is reduced, the voltage ripple,
electrical losses and therefore the malfunction likelihood due to device
failure is reduced significantly. The projected technique has been simulated
by MATLAB simulation. It’s shown that the projected method is a lot of
economical for the transient current limitation of Y-yg transformers.
Analysis of Multilevel Inverter using Bipolar and Unipolar Switching Schemes ...ijsrd.com
Cascaded H-bridge Multilevel Inverter (MLI) is most efficient topology for medium and high voltage DC-AC conversion, having less output harmonics and less commutation losses. Disadvantages are their complexity, more number of power devices, passive components and a complex control circuitry. Here a Cascaded Hybrid Multilevel Inverter is used to produce a three phase 9-level output voltages. Now a day inverter is also know as a DC-AC converter, is one of the most popular part of electrical device. This proposed inverter widely used in industries application such as speed control of induction motor. This thesis focus on three phase 9-level bipolar and unipolar switching inverter with characteristics like output voltage boosting ability and also we discus about the bipolar and unipolar switching scheme along with capacitor voltage control. The modified topology uses Cascaded H-bridge (CHB) with bidirectional and unidirectional switches producing boost up output voltage. Here a hybrid Pulse Width Modulation (PWM) technique is applied to control the power devices. This modulation technique uses a sine wave and a repeating wave, these waves are combined and a complete reference wave is generated. There is comparative study between CHB and modified topology between number of power devices used and Total Harmonic Distortions (THD). THD of modified topology is reduced and analyzed by FFT window. The results are observed by MATLAB/SIMULINK software.
Multilevel inverters have become more popular over the years in electric high power application
with the promise of less disturbances and the possibility to function at lower switching frequencies than
ordinary two-level inverters. This paper presents information about several multilevel inverter topologies,
such as the Neutral-Point Clamped Inverter and the Cascaded Multi cell Inverter. These multilevel
inverters will also be compared with two-level inverters in simulations to investigate the advantages of
using multilevel inverters. Modulation strategies, component comparison and solutions to the multilevel
voltage source balancing problem will also be presented in this work.
Keywords — multilevel, Neutral-clamped, PWM.
This paper proposed a new sparce matrix converter with Z-source network to provide unity voltage transfer ratio. It is an ac-to-ac converter with diode-IGBT bidirectional switches. The limitations of existing matrix converter like higher current THD and less voltage transfer ratio issues are overcome by this proposed matrix converter by inserting a Z-source. Due to this Z-source current harmonics are totally removed. The simulation is performed for different frequencies. The simulation results are presented to verify the THD and voltage transfer ratio and compared with the existing virtual AC/DC/AC matrix converter. The experimental output voltage amplitude can be varied with the variable frequencies.
SIMULATION ANALYSIS OF CLOSED LOOP DUAL INDUCTOR CURRENT-FED PUSH-PULL CONVER...Journal For Research
The current electronic devices require DC power source, which is taken from a battery or DC power supply. DC-DC converter is utilized to get regulated dc voltage from unregulated one. Switched mode power supply (SMPS) are commonly used in industrial applications, because of more advantages compared to linear power supply. In SMPS we have isolated and non-isolated converters, where isolated converters are frequently used, in order to get more voltage with multiple outputs. So among different isolated converters, push-pull converter is chosen for micro converter applications to obtain high voltage conversion ratio by using HF transformer, due to their better utilization of transformer. New methodology of control is implemented for making ZVS and ZCS at same time and to reduce the number of switches in the secondary side of dual inductor CFPP converter, which is a voltage doubler circuit. This becomes the solution for problem identification. Thus this converter with soft-switching reduces the switching losses.The current-fed push-pull converters are used in many applications like photo-voltaic (PV) power converters for boosting the output voltage. Push-pull converter is chosen for micro converter applications, to obtain high voltage conversion ratio by using high frequency (HF) transformer, due to their better utilization of transformer. This deals with the design of dual inductor CFPP converter, where zero voltage switching (ZVS) and zero current switching (ZCS) is achieved for the primary side of the converter by using secondary switches. Primary side switches are controlled by closed loop control topology. The secondary side is made with voltage doubler to obtain high voltage. Open loop and closed loop control of dual inductor current fed push pull converter simulation is finished by MATLAB/SIMULINK and their outcomes are analyzed.
This paper presents investigation and performance analysis of novel down sampling based clamping SV PWM technique for diode and cascaded Multi-level Invereter fed to Induction motor drive. A novel down sampling based clamping SVPWM has developed by adding triangular off set to sinusoidal fundamental waveform is modified by down sampling the reference wave by order of 10 so this technique is called clamping space vector pulse width modulation techniques such as PD, POD and APOD. so as to shift the lower order harmonics to higher order side. This novel carrier is compared with the offset injected space vector reference waveform to generate the required PWM pulses to the inverter. To analyze the performance of the proposed PWM technique it is implemented on seven level diode and cascaded Multi-level Inverter using Matlab/Simulink software tool for output line, phase voltage, currents, speed, torque and Total harmonic distortion analysis.
Multi Carrier based Multilevel Inverter with Minimal Harmonic DistortionIJPEDS-IAES
This paper presents performance features of Asymmetric Cascaded
Multilevel inverter. Multilevel inverters are commonly modulated by using
multicarrier pulse width modulation (MCPWM) techniques such as phaseshifted
multicarrier modulation and level-shifted multicarrier modulation.
Amongst these, level-shifted multicarrier modulation technique produces the
best harmonic performance. This work studies about multilevel inverter with
unequal DC sources using level shifting MCPWM technique. The
Performances indices like Total Harmonic Distortion (THD), number of
switches and DC Sources are considered. A procedure to achieve an
appropriate level shifting is also presented is this paper.
This document presents a comparative study of five-level and seven-level diode-clamped inverters controlled by space vector pulse width modulation (SVPWM). MATLAB/SIMULINK models of the two inverter topologies were developed. SVPWM control algorithms based on symmetrical sequence were used for each inverter. Both inverters were simulated driving an induction motor. The results showed that the seven-level inverter produced less harmonic distortion and torque fluctuations in the motor, while the five-level inverter had lower commutation losses. The seven-level inverter provided better motor dynamic response.
AC - AC power conversions were traditionally done by using thyristor power controllers, phase angle control or by
integral cycle control, but had low PF and other disadvantages. Variable voltage, variable frequency high power conversions
are nowadays use DC link and Matrix converters, with higher efficiency and better regulation. But in situations where only
voltage regulation is required and the circuit need to be simple and less complicated, directed PWM AC-AC converters are
more preferred, due to reduced size and components. This project presents the design and simulation of a new type of AC-AC
converter which can operate as traditional non-inverting buck and boost converters, and inverting buck-boost converter as
well. This converter uses six unidirectional current flowing and bidirectional voltage blocking switches, implemented by six
reverse blocking IGBTs or series MOSFET-diode pairs, two input and output filter capacitors, and one inductor. It has no
shoot-through problem of voltage source (or capacitor) even when all switches are turned-on and therefore; PWM dead times
are not needed resulting in high quality waveforms, and solves the commutation problem without using bulky and lossy RC
snubbers or dedicated soft-commutation strategies. It has smaller switching losses because; only two switches out of six are
switched at high frequency during each half cycle of input voltage, and it can use power MOSFETs as body diode never
conducts, making it immune from MOSFET failure risk..
Analysis of Multilevel Inverter using Bipolar and Unipolar Switching Schemes ...ijsrd.com
Cascaded H-bridge Multilevel Inverter (MLI) is most efficient topology for medium and high voltage DC-AC conversion, having less output harmonics and less commutation losses. Disadvantages are their complexity, more number of power devices, passive components and a complex control circuitry. Here a Cascaded Hybrid Multilevel Inverter is used to produce a three phase 9-level output voltages. Now a day inverter is also know as a DC-AC converter, is one of the most popular part of electrical device. This proposed inverter widely used in industries application such as speed control of induction motor. This thesis focus on three phase 9-level bipolar and unipolar switching inverter with characteristics like output voltage boosting ability and also we discus about the bipolar and unipolar switching scheme along with capacitor voltage control. The modified topology uses Cascaded H-bridge (CHB) with bidirectional and unidirectional switches producing boost up output voltage. Here a hybrid Pulse Width Modulation (PWM) technique is applied to control the power devices. This modulation technique uses a sine wave and a repeating wave, these waves are combined and a complete reference wave is generated. There is comparative study between CHB and modified topology between number of power devices used and Total Harmonic Distortions (THD). THD of modified topology is reduced and analyzed by FFT window. The results are observed by MATLAB/SIMULINK software.
Multilevel inverters have become more popular over the years in electric high power application
with the promise of less disturbances and the possibility to function at lower switching frequencies than
ordinary two-level inverters. This paper presents information about several multilevel inverter topologies,
such as the Neutral-Point Clamped Inverter and the Cascaded Multi cell Inverter. These multilevel
inverters will also be compared with two-level inverters in simulations to investigate the advantages of
using multilevel inverters. Modulation strategies, component comparison and solutions to the multilevel
voltage source balancing problem will also be presented in this work.
Keywords — multilevel, Neutral-clamped, PWM.
This paper proposed a new sparce matrix converter with Z-source network to provide unity voltage transfer ratio. It is an ac-to-ac converter with diode-IGBT bidirectional switches. The limitations of existing matrix converter like higher current THD and less voltage transfer ratio issues are overcome by this proposed matrix converter by inserting a Z-source. Due to this Z-source current harmonics are totally removed. The simulation is performed for different frequencies. The simulation results are presented to verify the THD and voltage transfer ratio and compared with the existing virtual AC/DC/AC matrix converter. The experimental output voltage amplitude can be varied with the variable frequencies.
SIMULATION ANALYSIS OF CLOSED LOOP DUAL INDUCTOR CURRENT-FED PUSH-PULL CONVER...Journal For Research
The current electronic devices require DC power source, which is taken from a battery or DC power supply. DC-DC converter is utilized to get regulated dc voltage from unregulated one. Switched mode power supply (SMPS) are commonly used in industrial applications, because of more advantages compared to linear power supply. In SMPS we have isolated and non-isolated converters, where isolated converters are frequently used, in order to get more voltage with multiple outputs. So among different isolated converters, push-pull converter is chosen for micro converter applications to obtain high voltage conversion ratio by using HF transformer, due to their better utilization of transformer. New methodology of control is implemented for making ZVS and ZCS at same time and to reduce the number of switches in the secondary side of dual inductor CFPP converter, which is a voltage doubler circuit. This becomes the solution for problem identification. Thus this converter with soft-switching reduces the switching losses.The current-fed push-pull converters are used in many applications like photo-voltaic (PV) power converters for boosting the output voltage. Push-pull converter is chosen for micro converter applications, to obtain high voltage conversion ratio by using high frequency (HF) transformer, due to their better utilization of transformer. This deals with the design of dual inductor CFPP converter, where zero voltage switching (ZVS) and zero current switching (ZCS) is achieved for the primary side of the converter by using secondary switches. Primary side switches are controlled by closed loop control topology. The secondary side is made with voltage doubler to obtain high voltage. Open loop and closed loop control of dual inductor current fed push pull converter simulation is finished by MATLAB/SIMULINK and their outcomes are analyzed.
This paper presents investigation and performance analysis of novel down sampling based clamping SV PWM technique for diode and cascaded Multi-level Invereter fed to Induction motor drive. A novel down sampling based clamping SVPWM has developed by adding triangular off set to sinusoidal fundamental waveform is modified by down sampling the reference wave by order of 10 so this technique is called clamping space vector pulse width modulation techniques such as PD, POD and APOD. so as to shift the lower order harmonics to higher order side. This novel carrier is compared with the offset injected space vector reference waveform to generate the required PWM pulses to the inverter. To analyze the performance of the proposed PWM technique it is implemented on seven level diode and cascaded Multi-level Inverter using Matlab/Simulink software tool for output line, phase voltage, currents, speed, torque and Total harmonic distortion analysis.
Multi Carrier based Multilevel Inverter with Minimal Harmonic DistortionIJPEDS-IAES
This paper presents performance features of Asymmetric Cascaded
Multilevel inverter. Multilevel inverters are commonly modulated by using
multicarrier pulse width modulation (MCPWM) techniques such as phaseshifted
multicarrier modulation and level-shifted multicarrier modulation.
Amongst these, level-shifted multicarrier modulation technique produces the
best harmonic performance. This work studies about multilevel inverter with
unequal DC sources using level shifting MCPWM technique. The
Performances indices like Total Harmonic Distortion (THD), number of
switches and DC Sources are considered. A procedure to achieve an
appropriate level shifting is also presented is this paper.
This document presents a comparative study of five-level and seven-level diode-clamped inverters controlled by space vector pulse width modulation (SVPWM). MATLAB/SIMULINK models of the two inverter topologies were developed. SVPWM control algorithms based on symmetrical sequence were used for each inverter. Both inverters were simulated driving an induction motor. The results showed that the seven-level inverter produced less harmonic distortion and torque fluctuations in the motor, while the five-level inverter had lower commutation losses. The seven-level inverter provided better motor dynamic response.
AC - AC power conversions were traditionally done by using thyristor power controllers, phase angle control or by
integral cycle control, but had low PF and other disadvantages. Variable voltage, variable frequency high power conversions
are nowadays use DC link and Matrix converters, with higher efficiency and better regulation. But in situations where only
voltage regulation is required and the circuit need to be simple and less complicated, directed PWM AC-AC converters are
more preferred, due to reduced size and components. This project presents the design and simulation of a new type of AC-AC
converter which can operate as traditional non-inverting buck and boost converters, and inverting buck-boost converter as
well. This converter uses six unidirectional current flowing and bidirectional voltage blocking switches, implemented by six
reverse blocking IGBTs or series MOSFET-diode pairs, two input and output filter capacitors, and one inductor. It has no
shoot-through problem of voltage source (or capacitor) even when all switches are turned-on and therefore; PWM dead times
are not needed resulting in high quality waveforms, and solves the commutation problem without using bulky and lossy RC
snubbers or dedicated soft-commutation strategies. It has smaller switching losses because; only two switches out of six are
switched at high frequency during each half cycle of input voltage, and it can use power MOSFETs as body diode never
conducts, making it immune from MOSFET failure risk..
Asymmetrical Cascaded Multi Level Inverter using Control Freedom Pulse width ...IAES-IJPEDS
In this paper, the suggested topologies are gained by cascading a full bridge inverter with dissimilar DC sources. This topology has several new patterns adopting the fixed switching frequency, multicarrier control freedom degree with mixture conceptions are established and simulated for the preferred three-phase cascaded multilevel inverter. In outstanding switching arrangement terminations, there are convinced degrees of freedom to produce the nine level AC output voltages with terminated switching positions for producing altered output voltages. These investigations focus on asymmetrical cascaded multilevel inverter engaging with carrier overlapping pulse width modulation (PWM) topologies. These topologies offer less amount of harmonics present in the output voltage and superior root mean square (RMS) values of the output voltages associated with the traditional sinusoidal pulse width modulation. This research studies carries with it MATLAB/SIMULINK based simulation and experimental results obtained using appropriated prototype to prove the validity of the proposed concept.
IRJET- Mitigation of Harmonics in Active Neutral Point Clamped Multilevel Inv...IRJET Journal
This document presents a simulation of a 7-level active neutral point clamped (ANPC) inverter. It begins with an introduction to multilevel inverters and discusses issues with conventional 5-level NPC and flying capacitor topologies. It then presents the objectives to develop a Simulink model of a 7-level ANPC inverter using MATLAB. The model is described including subsystems for the source, pulse generation, and switches. Simulation results showing the output voltage and current waveforms are presented, with THD values below 13% for voltage and 6% for current.
Equal Switching Distribution Method for Multi-Level Cascaded Inverterijsrd.com
the paper proposes a new method of equal switching distribution that can be applied to cascaded multilevel inverters. This method is based on the fact that in the cascaded multilevel inverters, the output phase voltage is the sum of voltage waveforms produced by all cascaded cells. By periodically exchanging cells' voltage waveforms, the proposed method ensures equal average switching's distribution between all cascaded cells. This method is applied to the 13-level inverter, which consists of three cascaded 5-level H-bridge cells per phase. However, the proposed method can be extended to any desired number of voltage levels and applied to any type of cascaded multilevel inverter. Extensive simulation results of the tested 13- level inverter with the equal switching distribution are presented. Moreover, the proposed method is compared to the standard control approaches and its advantages are shown.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
International Journal of Engineering Research and Development (IJERD)IJERD Editor
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Simulation of Five Level Diode Clamped Multilevel Inverterrahulmonikasharma
The power electronics device which converts DC power to AC power at required output voltage and frequency level is known as inverter. The voltage source inverters produce an output voltage or a current with levels either 0 or +ve or-ve V dc. They are known as two-level inverters. Multilevel inverter is to synthesize a near sinusoidal voltage from several levels of dc voltages. Multilevel inverter has advantage like minimum harmonic distortion. Multi-level inverters are emerging as the new breed of power converter options for high power applications. They typically synthesize the stair-case voltage waveform (from several dc sources) which has reduced harmonic content. Multi-level inverters have many attractive features, high voltage capability, reduced common mode voltages near sinusoidal outputs, low dv/dt, and smaller or even no output filter; sometimes no transformer is required at the input side, called the transformer-less solution, making them suitable for high power applications In this paper a 5-level Diode clamped multilevel inverter is developed by IGBTS using Simulink. Gating signals for these IGBTS have been generated by designing comparators. In order to maintain the different voltage levels at appropriate intervals, the conduction time intervals of IGBT have been maintained by controlling the pulse width of gating pulses[6] (by varying the reference signals magnitude of the comparator). The simulation results for 5-level and THD for the output have been identified by MATLAB/SIMULINK.
Fuzzy logic Control & Minimizing Commutation Torque Ripple for Brushless DC M...Editor IJMTER
Brushless dc motor still suffers from commutation torque ripple, which mainly depends
on speed and transient line current in the commutation interval. This paper presents a novel circuit
topology and a dc link voltage control strategy to keep incoming and outgoing phase currents
changing at the same rate during commutation. A dc–dc single-ended primary inductor converter
(SEPIC) and a switch selection circuit are employed in front of the inverter. The desired
commutation voltage is accomplished by the SEPIC converter. The dc link voltage control strategy is
carried out by the switch selection circuit to separate two procedures, adjusting the SEPIC converter
and regulating speed. The cause of commutation ripple is analyzed, and the way to obtain the desired
dc link voltage is introduced in detail. Finally, simulation and experimental results show that,
compared with the dc–dc converter, the proposed method can obtain the desired voltage much faster
and minimize commutation torque ripple more efficiently at both high and low speeds and the closed
loop control is achieved by Fuzzy logic control.
Torque Ripple Minimization of a BLDC Motor Drive by Using Electronic Commutat...AI Publications
Brushless DC motors are having a major problem with harmonics in torque. The variations in speed and production of noise should be minimized by using proper topologies. BLDC motors have been gaining attention from different Industrial and domestic appliance manufacturers, because of their high efficiency, high power density and easy maintenance and low cost. This paper presents a three phase BLDC motor with low cost drive to be driven without DC link capacitor. The proposed technique uses an electronic commutation and operates the machine exclusive of the intermediate DC link capacitor. The designing of Brushless DC motor drive system along with control system for torque ripple minimization, speed controller and current controllers are presented using MATLAB / SIMULINK and results are evaluated.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
1) The document presents a new zero-voltage switching (ZVS) topology for a three-phase grid-connected inverter. The topology uses an additional active clamping leg to achieve ZVS for all the main switches.
2) A new space vector modulation scheme is proposed to control the inverter such that the auxiliary switch operates at the same frequency as the main switches. This ensures ZVS turn-on of the main switches.
3) Simulation results on a 30kW prototype verify that the ZVS topology reduces switching losses, improves efficiency, and makes the inverter suitable for practical high power applications.
Fuzzy Logic Controller Based High Frequency Link AC-AC Converter For Voltage ...IJTET Journal
Abstract—In this paper, an advanced high frequency link AC-AC Push-pull cycloconverter for the voltage compensation is proposed in order to maintain the power quality in electric grid. The proposed methodology can be achieve arbitrary output voltage without using large energy storage elements. So that the system is more steadfast and less costly compared with the conventional inverter topology. Additionally, the proposed converter does not contain any line frequency transformer, which reduces the cost further. The control scheme for the push pull cycloconverter employs the fuzzy logic controller based sinusoidal pulse width modulation (SPWM) to accomplish better performance on voltage compensation, like unbalanced voltage harmonics elimination. The simulation results are given to show the effectiveness of the proposed high frequency link AC-AC converter and fuzzy logic controller based SPWM technology
- The document describes a cyclo-converter, which converts AC voltage at the supply frequency directly to AC voltage at the load frequency without an intermediate DC stage.
- It discusses the basic principle of operation using an equivalent circuit model and voltage waveforms for loads with different displacement angles.
- The circuit of a single-phase to single-phase cyclo-converter using thyristor bridges is presented. Its operation is explained for resistive and inductive loads in both continuous and discontinuous current modes. Waveforms show how the firing angles are varied to synthesize the output voltage.
- Cyclo-converters allow output frequencies up to about one-third of the supply frequency and operate with loads of any phase angle.
Design and Control of Switched-Inductor Quasi-Z-Source Inverter for Photovolt...irjes
The conventional Z-Source Inverter (ZSI) used for photovoltaic applications has certain
shortcomings such as high stress across the passive components and low boost factor. This paper presents the
design and analysis of three phase switched inductor quasi Z-source inverter (SL-QZSI) for photovoltaic (PV)
applications. The wide voltage gain and the compensation for dead time effect of SL-QZSI with the help of
shoot-through states makes it suitable for PV application. Modulation strategies such as Simple boost,
Maximum boost and Constant maximum boost control methods are investigated for the operation and control
of SL-QZSI. PV source is modeled in MATLAB and incremental & conductance MPPT algorithm is
implemented .Simulation of the SL-QZSI circuit powered by PV source is carried out by implementing
maximum boost control method and the performance parameters are discussed.
This paper presents combinations of level shifted pulse-width modulation algorithm with conventional discontinuous pulse-width modulation methods for cascaded multilevel inverters. In the proposed DPWM a zero sequence signal is injected in sinusoidal reference signal to generate various modulators with easier implementation. The analysis four various control strategies namely Common Carrier (CC), Inverted Carrier (IC), Phase Shifted (PS) and Inverted Phase Shift (IPS) for cascaded multilevel inverter fed induction motor drive has been illustrated. To validate the proposed work experimental tests has been carried out using dSPACE controller. Experimental study proves that using proposed algorithms reduction in common-mode voltage with fewer harmonics along with reduced switching loss for a cascaded multilevel inverter fed motor drive has been achieved.
International Journal of Engineering Research and DevelopmentIJERD Editor
This document summarizes a study investigating two soft-switched isolated DC-DC converter topologies for auxiliary power supply in railways. The converters aim to reduce size and weight by using a lightweight medium frequency transformer instead of heavy 50Hz transformers. One proposed topology uses an auxiliary circuit on the secondary side to achieve zero-current switching for the primary inverter switches. Equations are provided to analyze the operating modes and design considerations of this topology, including resonant component sizing, power device ratings, and output voltage characteristics based on input voltage and load current. Analytical expressions are given to determine maximum stresses on the power devices under different operating conditions.
Space Vector of Three Phase Three level Neutral Point Clamped Quasi Z Source ...IJTET Journal
Space vector of three phase three level neutral point clamped quasi z source inverter is proposed in this paper. Space vector modulation is the pulse width modulation consists of number of switching states. Space vector pulse width modulation technique utilizes 15% more power from DC source. Harmonics are reduced by the presence of switching states. Quasi Z-source inverter is advanced topologies which performs both boost and buck operation of a converter. The proposed inverter obtains continuous input current and the boost converter is not needed. So, maximum voltage can be obtained in the load and system complexity is reduced. Maximum power can be obtained from the solar panel by using MPPT. The implementation of MPPT is to operate a PV array under constant voltage and power reference to modify the duty cycle of the inverter.The simulation of proposed topology is done in MATLAB/SIMULINK software.
Comparators are basic building elements for designing modern analog and mixed signal systems. Speed and resolution are two important factors which are required for high speed applications. This paper presents a design for an on chip high-speed dynamic latched comparator for high frequency signal digitization. The dynamic latched comparator consists of two cross coupled inverters comprising a total of 9 MOS transistors. The measured and simulation results show that the dynamic latched comparator design has higher speed, low power dissipation and occupying less active area compared to double tail latched and preamplifier based clocked comparators. A new fully dynamic latched comparator which shows lower offset voltage and higher load drivability than the conventional dynamic latched comparators has been designed. With two additional inverters inserted between the input-stage and output-stage of the conventional double-tail dynamic comparator, the gain preceding the regenerative latch stage was improved and the complementary version of the output-latch stage, which has bigger output drive current capability at the same area, was implemented.
In this paper the multicarrier pulse width modulation (MCPWM) with multi value DC voltage source multilevel inverter is presented. These MLI’s are suitable in high voltage & high power application due to their ability to synthesize waveforms with better harmonic spectrum. Seven level inverter is simulated using MATLAB/Simulink. The use of Photovoltaic Cell as a DC source for the multilevel Inverter is proposed here.
Design of Three-Phase Three-Switch Buck-Type Rectifier for Pre-Charging Appli...IAES-IJPEDS
The main objective of a pre-charging circuit in variable frequency drives is to
pre-charge the DC-bus capacitor without any voltage and current overshoot
within the specified time. In exisiting variable frequency drives seperte precharging
circuits (or) thyristor bridges were used due to this drives power
density, cost becomes high and control technique becomes complex. This
paper presents about the design of three-phase three-switch buck-type
rectifier for pre-charging application used in variable frequency drives which
elimates the disadvantages of existing techniques. In this paper we will
discuss about design procedure of pre-charging circuit of an 800KW
converter with dc-link output voltage of 775V at an input ac voltage of 550V,
60Hz, selection of power and passive components, voltage and current stress
of power transistors. In the final this paper discusses about loss distribution
of the components and comparison of new converter technique with existing
pre-charging techniques.
Transients are subcycle events that last less than one cycle of an AC waveform. They are difficult to detect due to their short duration. This document discusses electrical transient system models and examples. It explains that a transient model includes energy storing elements (inductance and capacitance) and dissipating elements (resistance). Examples shown include the response of voltage and current in a capacitor and inductor when DC voltage is applied. The time constant of these circuits, which is determined by resistance and inductance/capacitance, influences how quickly the circuit returns to steady state after a transient event.
The International Journal of Engineering and Science (The IJES)theijes
The document compares a conventional full bridge buck DC-DC converter and an LCL-T type buck DC-DC converter through simulation. Simulation results show that the proposed 4-switch LCL-T buck converter has higher efficiency than the conventional full bridge converter. Key advantages of the LCL-T converter include reduced switching losses due to zero-voltage switching, improved electrical performance from the front-end LCL-T connection, and multi-output capability from associating one or two capacitors for resonant operation. The LCL-T converter is well-suited for low voltage, low power applications.
Asymmetrical Cascaded Multi Level Inverter using Control Freedom Pulse width ...IAES-IJPEDS
In this paper, the suggested topologies are gained by cascading a full bridge inverter with dissimilar DC sources. This topology has several new patterns adopting the fixed switching frequency, multicarrier control freedom degree with mixture conceptions are established and simulated for the preferred three-phase cascaded multilevel inverter. In outstanding switching arrangement terminations, there are convinced degrees of freedom to produce the nine level AC output voltages with terminated switching positions for producing altered output voltages. These investigations focus on asymmetrical cascaded multilevel inverter engaging with carrier overlapping pulse width modulation (PWM) topologies. These topologies offer less amount of harmonics present in the output voltage and superior root mean square (RMS) values of the output voltages associated with the traditional sinusoidal pulse width modulation. This research studies carries with it MATLAB/SIMULINK based simulation and experimental results obtained using appropriated prototype to prove the validity of the proposed concept.
IRJET- Mitigation of Harmonics in Active Neutral Point Clamped Multilevel Inv...IRJET Journal
This document presents a simulation of a 7-level active neutral point clamped (ANPC) inverter. It begins with an introduction to multilevel inverters and discusses issues with conventional 5-level NPC and flying capacitor topologies. It then presents the objectives to develop a Simulink model of a 7-level ANPC inverter using MATLAB. The model is described including subsystems for the source, pulse generation, and switches. Simulation results showing the output voltage and current waveforms are presented, with THD values below 13% for voltage and 6% for current.
Equal Switching Distribution Method for Multi-Level Cascaded Inverterijsrd.com
the paper proposes a new method of equal switching distribution that can be applied to cascaded multilevel inverters. This method is based on the fact that in the cascaded multilevel inverters, the output phase voltage is the sum of voltage waveforms produced by all cascaded cells. By periodically exchanging cells' voltage waveforms, the proposed method ensures equal average switching's distribution between all cascaded cells. This method is applied to the 13-level inverter, which consists of three cascaded 5-level H-bridge cells per phase. However, the proposed method can be extended to any desired number of voltage levels and applied to any type of cascaded multilevel inverter. Extensive simulation results of the tested 13- level inverter with the equal switching distribution are presented. Moreover, the proposed method is compared to the standard control approaches and its advantages are shown.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
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Simulation of Five Level Diode Clamped Multilevel Inverterrahulmonikasharma
The power electronics device which converts DC power to AC power at required output voltage and frequency level is known as inverter. The voltage source inverters produce an output voltage or a current with levels either 0 or +ve or-ve V dc. They are known as two-level inverters. Multilevel inverter is to synthesize a near sinusoidal voltage from several levels of dc voltages. Multilevel inverter has advantage like minimum harmonic distortion. Multi-level inverters are emerging as the new breed of power converter options for high power applications. They typically synthesize the stair-case voltage waveform (from several dc sources) which has reduced harmonic content. Multi-level inverters have many attractive features, high voltage capability, reduced common mode voltages near sinusoidal outputs, low dv/dt, and smaller or even no output filter; sometimes no transformer is required at the input side, called the transformer-less solution, making them suitable for high power applications In this paper a 5-level Diode clamped multilevel inverter is developed by IGBTS using Simulink. Gating signals for these IGBTS have been generated by designing comparators. In order to maintain the different voltage levels at appropriate intervals, the conduction time intervals of IGBT have been maintained by controlling the pulse width of gating pulses[6] (by varying the reference signals magnitude of the comparator). The simulation results for 5-level and THD for the output have been identified by MATLAB/SIMULINK.
Fuzzy logic Control & Minimizing Commutation Torque Ripple for Brushless DC M...Editor IJMTER
Brushless dc motor still suffers from commutation torque ripple, which mainly depends
on speed and transient line current in the commutation interval. This paper presents a novel circuit
topology and a dc link voltage control strategy to keep incoming and outgoing phase currents
changing at the same rate during commutation. A dc–dc single-ended primary inductor converter
(SEPIC) and a switch selection circuit are employed in front of the inverter. The desired
commutation voltage is accomplished by the SEPIC converter. The dc link voltage control strategy is
carried out by the switch selection circuit to separate two procedures, adjusting the SEPIC converter
and regulating speed. The cause of commutation ripple is analyzed, and the way to obtain the desired
dc link voltage is introduced in detail. Finally, simulation and experimental results show that,
compared with the dc–dc converter, the proposed method can obtain the desired voltage much faster
and minimize commutation torque ripple more efficiently at both high and low speeds and the closed
loop control is achieved by Fuzzy logic control.
Torque Ripple Minimization of a BLDC Motor Drive by Using Electronic Commutat...AI Publications
Brushless DC motors are having a major problem with harmonics in torque. The variations in speed and production of noise should be minimized by using proper topologies. BLDC motors have been gaining attention from different Industrial and domestic appliance manufacturers, because of their high efficiency, high power density and easy maintenance and low cost. This paper presents a three phase BLDC motor with low cost drive to be driven without DC link capacitor. The proposed technique uses an electronic commutation and operates the machine exclusive of the intermediate DC link capacitor. The designing of Brushless DC motor drive system along with control system for torque ripple minimization, speed controller and current controllers are presented using MATLAB / SIMULINK and results are evaluated.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
1) The document presents a new zero-voltage switching (ZVS) topology for a three-phase grid-connected inverter. The topology uses an additional active clamping leg to achieve ZVS for all the main switches.
2) A new space vector modulation scheme is proposed to control the inverter such that the auxiliary switch operates at the same frequency as the main switches. This ensures ZVS turn-on of the main switches.
3) Simulation results on a 30kW prototype verify that the ZVS topology reduces switching losses, improves efficiency, and makes the inverter suitable for practical high power applications.
Fuzzy Logic Controller Based High Frequency Link AC-AC Converter For Voltage ...IJTET Journal
Abstract—In this paper, an advanced high frequency link AC-AC Push-pull cycloconverter for the voltage compensation is proposed in order to maintain the power quality in electric grid. The proposed methodology can be achieve arbitrary output voltage without using large energy storage elements. So that the system is more steadfast and less costly compared with the conventional inverter topology. Additionally, the proposed converter does not contain any line frequency transformer, which reduces the cost further. The control scheme for the push pull cycloconverter employs the fuzzy logic controller based sinusoidal pulse width modulation (SPWM) to accomplish better performance on voltage compensation, like unbalanced voltage harmonics elimination. The simulation results are given to show the effectiveness of the proposed high frequency link AC-AC converter and fuzzy logic controller based SPWM technology
- The document describes a cyclo-converter, which converts AC voltage at the supply frequency directly to AC voltage at the load frequency without an intermediate DC stage.
- It discusses the basic principle of operation using an equivalent circuit model and voltage waveforms for loads with different displacement angles.
- The circuit of a single-phase to single-phase cyclo-converter using thyristor bridges is presented. Its operation is explained for resistive and inductive loads in both continuous and discontinuous current modes. Waveforms show how the firing angles are varied to synthesize the output voltage.
- Cyclo-converters allow output frequencies up to about one-third of the supply frequency and operate with loads of any phase angle.
Design and Control of Switched-Inductor Quasi-Z-Source Inverter for Photovolt...irjes
The conventional Z-Source Inverter (ZSI) used for photovoltaic applications has certain
shortcomings such as high stress across the passive components and low boost factor. This paper presents the
design and analysis of three phase switched inductor quasi Z-source inverter (SL-QZSI) for photovoltaic (PV)
applications. The wide voltage gain and the compensation for dead time effect of SL-QZSI with the help of
shoot-through states makes it suitable for PV application. Modulation strategies such as Simple boost,
Maximum boost and Constant maximum boost control methods are investigated for the operation and control
of SL-QZSI. PV source is modeled in MATLAB and incremental & conductance MPPT algorithm is
implemented .Simulation of the SL-QZSI circuit powered by PV source is carried out by implementing
maximum boost control method and the performance parameters are discussed.
This paper presents combinations of level shifted pulse-width modulation algorithm with conventional discontinuous pulse-width modulation methods for cascaded multilevel inverters. In the proposed DPWM a zero sequence signal is injected in sinusoidal reference signal to generate various modulators with easier implementation. The analysis four various control strategies namely Common Carrier (CC), Inverted Carrier (IC), Phase Shifted (PS) and Inverted Phase Shift (IPS) for cascaded multilevel inverter fed induction motor drive has been illustrated. To validate the proposed work experimental tests has been carried out using dSPACE controller. Experimental study proves that using proposed algorithms reduction in common-mode voltage with fewer harmonics along with reduced switching loss for a cascaded multilevel inverter fed motor drive has been achieved.
International Journal of Engineering Research and DevelopmentIJERD Editor
This document summarizes a study investigating two soft-switched isolated DC-DC converter topologies for auxiliary power supply in railways. The converters aim to reduce size and weight by using a lightweight medium frequency transformer instead of heavy 50Hz transformers. One proposed topology uses an auxiliary circuit on the secondary side to achieve zero-current switching for the primary inverter switches. Equations are provided to analyze the operating modes and design considerations of this topology, including resonant component sizing, power device ratings, and output voltage characteristics based on input voltage and load current. Analytical expressions are given to determine maximum stresses on the power devices under different operating conditions.
Space Vector of Three Phase Three level Neutral Point Clamped Quasi Z Source ...IJTET Journal
Space vector of three phase three level neutral point clamped quasi z source inverter is proposed in this paper. Space vector modulation is the pulse width modulation consists of number of switching states. Space vector pulse width modulation technique utilizes 15% more power from DC source. Harmonics are reduced by the presence of switching states. Quasi Z-source inverter is advanced topologies which performs both boost and buck operation of a converter. The proposed inverter obtains continuous input current and the boost converter is not needed. So, maximum voltage can be obtained in the load and system complexity is reduced. Maximum power can be obtained from the solar panel by using MPPT. The implementation of MPPT is to operate a PV array under constant voltage and power reference to modify the duty cycle of the inverter.The simulation of proposed topology is done in MATLAB/SIMULINK software.
Comparators are basic building elements for designing modern analog and mixed signal systems. Speed and resolution are two important factors which are required for high speed applications. This paper presents a design for an on chip high-speed dynamic latched comparator for high frequency signal digitization. The dynamic latched comparator consists of two cross coupled inverters comprising a total of 9 MOS transistors. The measured and simulation results show that the dynamic latched comparator design has higher speed, low power dissipation and occupying less active area compared to double tail latched and preamplifier based clocked comparators. A new fully dynamic latched comparator which shows lower offset voltage and higher load drivability than the conventional dynamic latched comparators has been designed. With two additional inverters inserted between the input-stage and output-stage of the conventional double-tail dynamic comparator, the gain preceding the regenerative latch stage was improved and the complementary version of the output-latch stage, which has bigger output drive current capability at the same area, was implemented.
In this paper the multicarrier pulse width modulation (MCPWM) with multi value DC voltage source multilevel inverter is presented. These MLI’s are suitable in high voltage & high power application due to their ability to synthesize waveforms with better harmonic spectrum. Seven level inverter is simulated using MATLAB/Simulink. The use of Photovoltaic Cell as a DC source for the multilevel Inverter is proposed here.
Design of Three-Phase Three-Switch Buck-Type Rectifier for Pre-Charging Appli...IAES-IJPEDS
The main objective of a pre-charging circuit in variable frequency drives is to
pre-charge the DC-bus capacitor without any voltage and current overshoot
within the specified time. In exisiting variable frequency drives seperte precharging
circuits (or) thyristor bridges were used due to this drives power
density, cost becomes high and control technique becomes complex. This
paper presents about the design of three-phase three-switch buck-type
rectifier for pre-charging application used in variable frequency drives which
elimates the disadvantages of existing techniques. In this paper we will
discuss about design procedure of pre-charging circuit of an 800KW
converter with dc-link output voltage of 775V at an input ac voltage of 550V,
60Hz, selection of power and passive components, voltage and current stress
of power transistors. In the final this paper discusses about loss distribution
of the components and comparison of new converter technique with existing
pre-charging techniques.
Transients are subcycle events that last less than one cycle of an AC waveform. They are difficult to detect due to their short duration. This document discusses electrical transient system models and examples. It explains that a transient model includes energy storing elements (inductance and capacitance) and dissipating elements (resistance). Examples shown include the response of voltage and current in a capacitor and inductor when DC voltage is applied. The time constant of these circuits, which is determined by resistance and inductance/capacitance, influences how quickly the circuit returns to steady state after a transient event.
The International Journal of Engineering and Science (The IJES)theijes
The document compares a conventional full bridge buck DC-DC converter and an LCL-T type buck DC-DC converter through simulation. Simulation results show that the proposed 4-switch LCL-T buck converter has higher efficiency than the conventional full bridge converter. Key advantages of the LCL-T converter include reduced switching losses due to zero-voltage switching, improved electrical performance from the front-end LCL-T connection, and multi-output capability from associating one or two capacitors for resonant operation. The LCL-T converter is well-suited for low voltage, low power applications.
- The document describes the design, modeling, and simulation of a fuzzy logic controlled static VAR compensator (SVC) for a transmission line.
- An SVC uses thyristor-controlled reactors and fixed capacitors to continuously regulate the voltage of a transmission line by absorbing or producing reactive power.
- A fuzzy logic controller is designed to control the firing angle of the thyristors to maintain a constant voltage at the receiving end of the transmission line for different load conditions. Simulations are carried out to demonstrate the effectiveness of the fuzzy controlled SVC.
Effect of Switching angle on Magnetizing flux and Inrush current of a Transfo...IOSR Journals
This document investigates the effect of switching angle on magnetizing flux and inrush current in transformers. It finds that increasing the switching angle decreases both the amplitude of the magnetizing flux waveform and the inrush current amplitude. The highest inrush current occurs when switching occurs at a voltage zero crossing with a switching angle of 0 degrees. Increasing the switching angle reduces the dc offset of the flux waveform and lowers the peak inrush current. Switching angle variation is thus an effective way to control transformer inrush current.
Simulation of SPWM based Z-Source InverterIOSR Journals
1) The document presents a simulation of a SPWM based Z-source inverter. Z-source inverters can boost or buck the output voltage from a DC supply, overcoming limitations of traditional voltage source inverters.
2) MATLAB/Simulink models were developed for a Z-source inverter feeding resistive, inductive, and motor loads. Simulation results validated that the Z-source inverter has lower total harmonic distortion than traditional voltage source and current source inverters.
3) The Z-source inverter topology was analyzed and its operating principle explained. Sinusoidal pulse width modulation was used for switching control. Simulation results showed improved performance of the Z-source inverter over
IRJET- Design and Implementation of Isolated Multi-Output Flyback ConverterIRJET Journal
This document describes the design and implementation of an isolated multi-output flyback converter. A flyback converter uses a single switch and transformer to provide isolated output voltages from an input source. The designed converter uses a toroidal transformer with multiple secondary windings to generate multiple isolated output voltages at fixed levels. Simulation results and specifications for the transformer, switch, and outputs are provided. The flyback converter provides an efficient and low-cost solution for applications requiring multiple isolated low-power DC outputs.
Dynamic Analysis and Testing of on-load tap changerLeonardo Nicolini
The dynamic resistance measurement (DRM) was developed to analyze the switching process of on-load tap changers (OLTCs), which have a high failure rate of around 30%. DRM allows detection of issues like arcing contacts or switching interruptions by measuring the fast switching process. To properly analyze DRM results, it is important to know the OLTC type and construction. DRM analysis focuses on features of the current curve during switching, like amplitude, which indicates contact resistance, and timing, which may show mechanical problems. Proper test currents around 3-5A provide a stable measurement. Shorting the secondary side increases sensitivity. Switching direction and tap position can impact results due to differences in winding configuration.
The document presents a novel transformerless inverter topology for photovoltaic systems that aims to eliminate leakage current. It begins with background on transformerless inverters and the issue of leakage current caused by the lack of galvanic isolation when the transformer is omitted. It then analyzes the origin of common mode voltage and leakage current in conventional transformerless topologies. The paper goes on to propose a new topology that is shown through simulation and experiment to successfully eliminate leakage current while maintaining high efficiency and producing a pure sine wave with no zero-crossing distortion.
IRJET- Simulation of Energization and De-Energization of Capacitor Banks and ...IRJET Journal
This document discusses simulation of transient overvoltages caused by energization and de-energization of capacitor banks in distribution systems. The key points are:
1. Energization of capacitor banks causes larger transient overvoltage peaks compared to de-energization. Peak voltages of 2.48 PU and currents of 2567 A were observed during energization.
2. Different mitigation techniques for transients were simulated, including pre-insertion resistors, inductors, and impedance. Pre-insertion impedance was found to be most effective at reducing transients.
3. Total harmonic distortion of voltages reached 35.34% during energization and 15.34% during de-energization without
project report on plc based load sharingVivek Arun
This document provides information about the hardware requirements for a PLC based load sharing project. It discusses transformers, diodes, PLCs, rectifiers, resistors, capacitors, relays, LEDs, and DC motors. Transformers are used to convert AC voltages and connect multiple power sources in parallel. Diodes allow current to flow in one direction. PLCs are used for automation and control. Rectifiers convert AC to DC. Resistors and capacitors are basic electronic components. Relays, LEDs, and DC motors are also used in the circuit. The project aims to automatically share loads between multiple transformers connected to the system based on the load level.
A Resonant Converter with LLC for DC-to-DC Converter Based ApplicationsIJMTST Journal
This document discusses a current mode control scheme for LLC series resonant DC-to-DC converters used for electric vehicle battery chargers. The proposed current mode control employs feedback from the resonant tank current to nullify effects of changes in power stage dynamics, improving performance over conventional voltage mode control. The LLC converter has multiple resonant modes depending on operating frequency and load. Experimental results show the current mode control achieves 97.96% peak efficiency for a 6.6 kW, 390V to 250-450V converter. Future work will focus on design optimization and a simpler design procedure.
A new closed loop AC to DC ĈUK converter is presented in this paper. The conventional ĈUK AC to DC converter has no feedback circuit. Thereby, the output voltage of the converter changes while changing the load. The proposed closed loop converter can regulate voltage with the variation of load over a wide range. Moreover, the power factor and Total Harmonic Distortion (THD) of the supply side current found quite satisfactory from this closed loop ĈUK converter. The converter operates in four steps with a different combination of voltage polarities and switching states. The feedback path consists of a voltage control loop and a current control loop. The closed loop ĈUK converter in this study is compared with the open loop version. Additionally, the comparison is made with the conventional converter of the same topology. The effectiveness in terms of power factor and THD of the proposed converter is verified using simulation results.
This document summarizes a research paper on a novel soft switching LCL-T buck DC-DC converter system. The proposed converter uses an LCL-T topology with four switches to step down the input voltage. It connects capacitors in series with the input to generate a midpoint voltage of Vin/2, allowing each switch to experience only half the input voltage during operation. Simulation results show this converter achieves zero voltage switching and reduces switching losses compared to a conventional full bridge buck converter. Both open and closed loop models are developed and simulated in MATLAB, demonstrating constant output voltage regulation can be achieved.
Applications of power electronic device to power systemswathiammu7
This presentation summarizes power electronic devices used in power systems, including the SCR and TRIAC. It describes the introduction, structure, operating modes, characteristics and applications of the SCR. The SCR's applications include motor starters and regulators. It also discusses the TRIAC's structure, operating quadrants, VI characteristics and applications such as LED drivers for street lighting. The presentation concludes with noting that power systems are networks for supplying, transferring and using electrical power to homes and industry.
SPEED CONTROL OF SEPARATELY EXCITED DC MOTOR USING POWER ELECTRONIC CONVERTER ijiert bestjournal
In a modern technology the use of power electronic devices in the control strategies of
electrical drives is increasing. The speed of a DC motor can be varied by controlling the field
flux, the armature resistance or the terminal voltage applied to the armature circuit. The three
most common speed control methods are field resistance control, armature voltage control,
and armature resistance control. But here a technique of drive has been used for DC motor’s
speed control is chopper and some power electronics devices. It has been shown here the use
of chopper and power electronics devices which paves the way of controlling also torque and
speed characteristics of DC motor. Now the simulation of model is done and analysed in
MATLAB (Simulink) under varying speed and torque condition
The document describes a project report on three phase fault analysis with auto reset. It includes a block diagram of the project, descriptions of the hardware components used including transformers, voltage regulators, 555 timers, and relays. It also includes schematic and layout diagrams and details on testing the hardware. The system is designed to automatically disconnect the three phase power supply in the event of a fault, with the supply automatically resetting for temporary faults but remaining tripped for permanent faults.
Development of a Novel Three Phase Grid-Tied Multilevel Inverter TopologyIAES-IJPEDS
The conventional line-commutated ac-to-dc converters/ inverters have square-shaped line current. It contains higher-order harmonics which generates EMI and it causes more heating of the core of distribution or power transformers. PWM based inverters using MOSFET/IGBT have higher switching losses, and the power handling capability and reliability are quite low in comparison to thyristors/ SCR. A thyristor based forced commutated inverters are not suitable for PWM applications due to the problems of commutation circuits. A pure sinusoidal voltage output or waveform with low harmonic contents is most desirable for ac load using dc to ac conversion. This paper presents a new multilevel inverter topology in which three phase ac- to-dc converter circuits are used in inversion mode by controlling the switching angle. Due to natural commutation, no separate circuit is required for synchronization. In this paper simulation and analysis are done for grid-tied three-phase 6-pulse, Two three-phase, 3-pulse and 12-pulse converter. These converters are analysed for different battery voltage and different switching angle combinations in order to reduce the total harmonic distortion (THD). Three-phase harmonic filters are further added to the grid side to reduce the harmonic content in the line current. A comparative study of these converters is also presented in this paper.
A DC-DC converter topology is presented
combining the soft switching effects of the Snubber Assisted Zero
Voltage and Zero Current Transition (SAZZ) topology and the
increased inductor frequency of the dual interleaved boost
converter with interphase transformer. The snubber capacitors
and output capacitances of the main devices are discharged prior
to turn on using a single auxiliary inductor, eliminating turn on
losses. Furthermore, the turn off losses are significantly reduced
since the energy stored in the device output capacitance at turn
off is recovered at turn on. The effectiveness of the topology is
demonstrated on a SiC prototype operating at 12.5 kW, 112 kHz,
reducing the switching losses by 50%.
IRJET- Bidirectional Control of Resonant Converter in Power Electronic Tracti...IRJET Journal
This document presents a bidirectional control strategy for a LLC resonant converter used in a power electronic traction transformer (PETT) for locomotive applications. The strategy allows the converter to automatically adjust the power flow direction to keep the DC output voltage constant when the train transitions between traction and regenerative braking modes. A MATLAB/Simulink model is developed to simulate the LLC resonant converter using the proposed control strategy. Simulation results demonstrate the converter maintaining a constant 1500V output voltage under different load conditions while achieving soft-switching and high efficiency through the bidirectional control approach.
The document provides an overview of different topologies of DC/DC bidirectional converters that have been proposed for various applications. It discusses several bidirectional converter topologies including LLC resonant converters, three-level converters, multiport converters, and resonant converters with voltage doublers. The topologies aim to achieve benefits like high efficiency, full soft switching, isolation, and high voltage gain. Equations are provided for the voltage and power transfer characteristics of some of the converters.
Similar to A Novel Transient Current Limiter Based on Three-Phase Thyristor Bridge for Y-yg Transformers (20)
Inter-Area Oscillation Damping using an STATCOM Based Hybrid Shunt Compensati...IJPEDS-IAES
FACTS devices are one of the latest technologies which have been used to
improve power system dynamic and stability during recent years. However,
widespread adoption of this technology has been hampered by high cost
and reliability concerns. In this paper an economical phase imbalanced shunt
reactive compensation concept has been introduced and its ability for power
system dynamic enhancement and inter-area oscillation damping are
investigated. A hybrid phase imbalanced scheme is a shunt capacitive
compensation scheme, where two phases are compensated by fixed shunt
capacitor (C) and the third phase is compensated by a Static Synchronous
Compensator (STATCOM) in shunt with a fixed capacitor (CC). The power
system dynamic stability enhancement would be achieved by adding
a conventional Wide Area Damping Controller (WADC) to the main control
loop of the single phase STATCOM. Two different control methodologies
are proposed: a non-optimized conventional damping controller
and a conventional damping controller with optomised parameters that are
added to the main control loop of the unbalanced compensator in order to
damp the inter area oscillations. The proposed arrangement would, certainly,
be economically attractive when compared with a full three-phase
STATCOM. The proposed scheme is prosperously applied in a 13-bus
six-machine test system and various case studies are conducted to
demonstrate its ability in damping inter-area oscillations and power system
dynamic enhancement.
Fuzzy Gain-Scheduling Proportional–Integral Control for Improving the Speed B...IJPEDS-IAES
In this article, we have set up a vector control law of induction machine
where we tried different type of speed controllers. Our control strategy is of
type Field Orientated Control (FOC). In this structure we designed a Fuzzy
Gain-Scheduling Proportional–Integral (Pi) controller to obtain best result
regarding the speed of induction machine. At the beginning we designed a Pi
controller with fixed parameters. We came up to these parameters by
identifying the transfer function of this controller to that of Broïda (second
order transfer function). Then we designed a fuzzy logic (FL) controller.
Based on simulation results, we highlight the performances of each
controller. To improve the speed behaviour of the induction machine, we
have designend a controller called “Fuzzy Gain-Scheduling Proportional–
Integral controller” (FGS-PI controller) which inherited the pros of the
aforementioned controllers. The simulation result of this controller will
strengthen its performances.
Advance Technology in Application of Four Leg Inverters to UPQCIJPEDS-IAES
This article presents a novel application of four leg inverter with
conventional Sinusoidal Pulse Width Modulation (SPWM) Scheme to
Unified Power Quality Conditioner (UPQC). The Power Quality problem
became burning issues since the starting of high voltage AC transmission
system. Hence, in this article it has been discussed to mitigate the PQ issues
in high voltage AC systems through a three phase Unified Power Quality
Conditioner (UPQC) under various conditions, such as harmonic mitigation
scheme, non linear loads, sag and swell conditions as well. Also, it proposes
to control harmoincs with various artificial intelligent techniques. Thus
application of these control technique such as Neural Networks (ANN)
Fuzzy Logic makes the system performance in par with the standards
and also compared with existing system. The simulation results based on
MATLAB/Simulink are discussed in detail to support the concept developed
in the paper.
Modified SVPWM Algorithm for 3-Level Inverter Fed DTC Induction Motor DriveIJPEDS-IAES
In this paper, a modified space vector pulse width modulation (MSVPWM)
algorithm is developed for 3-level inverter fed direct torque controlled
induction motor drive (DTC-IMD). MSVPWM algorithm simplifies
conventional space vector pulse width modulation (CSVPWM) algorithm for
multilevel inverter (MLI), whose complexity lies in sector/subsector/subsubsector
identification; which will commensurate with number of levels. In
the proposed algorithm sectors are identified as in two level inverter
and subsectors/sub-subsectors are identified by shifting the original reference
vector to sector 1 (S1). This is valid due to the fact that a three level space
vector plane is a composition of six two level space planes, and are
symmetrical with reference to six pivot states. Switching state/sequence
selection is also very important while dealing with SVPWM strategy for
MLI. In the proposed algorithm out of 27 available switching states apt
switching state is selected based on sector and subsector number, such that
voltage ripple is considerably less. To validate the proposed algorithm, it is
tested on a three level neutral point clamped (NPC) inverter fed DTC-IMD.
The performance of the MSVPWM algorithm is analyzed by comparing no
load stator current ripple of the three level DTC-IMD with two level
DTC-IMD. Significant reduction in steady state torque and flux ripple is
observed. Hence, reduced acoustic noise is a distinctive facet of the proposed
method.
Modelling of a 3-Phase Induction Motor under Open-Phase Fault Using Matlab/Si...IJPEDS-IAES
The d-q model of Induction Motors (IMs) has been effectively used as an
efficient method to analyze the performance of the induction machines. This
study presents a step by step Matlab/Simulink implementation
of a star-connected 3-phase IM under open-phase fault (faulty 3-phase IM)
using d-q model. The presented technique in this paper can be simply
implemented in one block and can be made available for control purposes.
The simulated results provide to show the behavior of the star-connected 3-phase IM under open-phase fault condition.
Performance Characteristics of Induction Motor with FielIJPEDS-IAES
With development of power electronics and control Theories, the AC motor
control becomes easier. So the AC motors are used instead of the DC motor
in the drive applications. With this development, a several methods of control
are invented. The field oriented control and direct torque control are from the
best methods to control the drive systems. This paper is compared between
the field oriented control and direct torque control to show the advantages
and disadvantages of these methods of controls. This study discussed the
effects of these methods of control on the total harmonic distortion of the
current and torque ripples. This occurs through study the performance
characteristics of the AC motor. The motor used in this study is an induction
motor. This study is simulated through the MATLAB program.
A Novel Modified Turn-on Angle Control Scheme for Torque- Ripple Reduction in...IJPEDS-IAES
In recent years, Switched Reluctance Motors (SRM) have been dramatically
considered with both researchers and industries. SRMs not only have a
simple and reliable structure, but also have low cost production process.
However, discrete torque production of SRM along with intensive magnetic
saturation in stator and rotor cores are the major drawbacks of utilizing in
variety of industrial applications and also causes the inappropriate torque
ripples. In this paper, a modified logical-rule-based Torque Sharing Function
(TSF) method is proposed considering turn-on angle control. The optimized
turn-on angle for conducting each phase is achieved by estimating the
inductance curve in the vicinity of unaligned position and based on an
analytical solution for each phase voltage equation. Simulation results on a
four-phase switched reluctance motor and comparison with the conventional
methods validates the effectiveness of the proposed method.
Modeling and Simulation of Induction Motor based on Finite Element AnalysisIJPEDS-IAES
This paper presents the development of a co-simulation platform of induction
motor (IM). For the simulation, a coupled model is introduced which
contains the control, the power electronics and also the induction machine.
Each of these components is simulated in different software environments.
So, this study provides an advanced modeling and simulation tools for IM
which integrate all the components into one common simulation platform
environment. In this work, the IM is created using Ansys-Maxwell based on
Finite Element Analysis (FEA), whereas the power electronic converter is
developed in Ansys-Simplorer and the control scheme is build in MATLABSimulink
environment. Such structure can be useful for accurate design
and allows coupling analysis for more realistic simulation. This platform is
exploited to analyze the system models with faults caused by failures of
different drive’s components. Here, two studies cases are presented: the first
is the effects of a faulty device of the PWM inverter, and the second case is
the influence of the short circuit of two stator phases. In order to study the
performance of the control drive of the IM under fault conditions,
a co-simulation of the global dynamic model has been proposed to analyze
the IM behavior and control drives. In this work, the co-simulation has been
performed; furthermore the simulation results of scalar control allowed
verifying the precision of the proposed FEM platform.
Comparative Performance Study for Closed Loop Operation of an Adjustable Spee...IJPEDS-IAES
In this paper an extensive comparative study is carried out between PI
and PID controlled closed loop model of an adjustable speed Permanent
Magnet Synchronous Motor (PMSM) drive. The incorporation of Sinusoidal
Pulse Width Modulation (SPWM) strategy establishes near sinusoidal
armature phase currents and comparatively less torque ripples without
sacrificing torque/weight ratio. In this closed loop model of PMSM drive, the
information about reference speed is provided to a speed controller, to ensure
that actual drive speed tracks the reference speed with ideally zero steady
state speed error. The entire model of PMSM closed loop drive is divided
into two loops, inner loop current and outer loop speed. By taking the
different combinations of two classical controllers (PI & PID) related with
two loop control structure, different approximations are carried out. Hence a
typical comparative study is introduced to familiar with the different
performance indices of the system corresponding to time domain and
frequency domain specifications. Therefore overall performance of closed
loop PMSM drive is tested and effectiveness of controllers will be
determined for different combinations.
Novel Discrete Components Based Speed Controller for Induction MotorIJPEDS-IAES
This paper presents an electronic design based on general purpose discrete
components for speed control of a single phase induction motor drive. The
MOSFETs inverter switching is controlled using Sampled Sinusoidal Pulse
Width Modulation (SPWM) techniques with V/F method based on Voltage
Controlled Oscillator (VCO). The load power is also controlled by a novel
design to produce a suitable SPWM pulse. The proposed electronic system
has ability to control the output frequency with flexible setting of lower limit
to less than 1 Hz and to higher frequency limits to 55 Hz. Moreover, the
proposed controller able to control the value of load voltage to frequency
ratio, which plays a major parameter in the function of IM speed control.
Furthermore, the designed system is characterized by easy manufacturing
and maintenance, high speed response, low cost, and does not need to
program steps as compared to other systems based on Microcontroller
and digital signal processor (DSP) units. The complete proposed electronic
design is made by the software of NI Multisim version 11.0 and all the
internal sub-designs are shown in this paper. Simulation results show the
effectiveness of electronic design for a promising of a high performance IM
PWM drive.
Sensorless Control of a Fault Tolerant PMSM Drives in Case of Single-Phase Op...IJPEDS-IAES
This paper introduces a sensorless-speed-controlled PMSM motor fed by a
four-leg inverter in case of a single phase open circuit fault regardless in
which phase is the fault. To minimize the system performance degradation
due to a single phase open circuit fault, a fault tolerant control strategy that
includes taking appropriate actions to control the two remaining healthy
currents is used in addition to use the fourth leg of the inverter. Tracking the
saliency is done through measuring the dynamic current responses of the
healthy phases of the PMSM motor due the IGBT switching actions using the
fundamental PWM method without introducing any modification to the
operation of the fourth leg of the inverter. Simulation results are provided to
verify the effectiveness of the proposed strategy for sensorless controlling of
a PMSM motor driven by a fault-tolerant four-phase inverter over a wide
speed ranges under the case of a single phase open circuit.
Improved Stator Flux Estimation for Direct Torque Control of Induction Motor ...IJPEDS-IAES
Stator flux estimation using voltage model is basically the integration of the
induced stator back electromotive force (emf) signal. In practical
implementation the pure integration is replaced by a low pass filter to avoid
the DC drift and saturation problems at the integrator output because of the
initial condition error and the inevitable DC components in the back emf
signal. However, the low pass filter introduces errors in the estimated stator
flux which are significant at frequencies near or lower than the cutoff
frequency. Also the DC components in the back emf signal are amplified at
the low pass filter output by a factor equals to . Therefore, different
integration algorithms have been proposed to improve the stator flux
estimation at steady state and transient conditions. In this paper a new
algorithm for stator flux estimation is proposed for direct torque control
(DTC) of induction motor drives. The proposed algorithm is composed of a
second order high pass filter and an integrator which can effectively
eliminates the effect of the error initial condition and the DC components.
The amplitude and phase errors compensation algorithm is selected such that
the steady state frequency response amplitude and phase angle are equivalent
to that of the pure integrator and the multiplication and division by stator
frequency are avoided. Also the cutoff frequency selection is improved; even
small value can filter out the DC components in the back emf signal. The
simulation results show the improved performance of the induction motor
direct torque control drive with the proposed stator flux estimation algorithm.
The simulation results are verified by the experimental results.
Minimization of Starting Energy Loss of Three Phase Induction Motors Based on...IJPEDS-IAES
The purpose of this paper is to minimize energy losses consumed by three
phase induction motors during starting with wide range of load torque from
no load to full load. This will limit the temperature rise and allows for more
numbers of starting during a definite time. Starting energy losses
minimization is achieved by controlling the rate of increasing voltage
and frequency to start induction motor under certain load torque within a
definite starting time. Optimal voltage and frequency are obtained by particle
swarm optimization (PSO) tool according to load torque. Then, outputs of the
PSO are used to design a neuro-fuzzy controller to control the output voltage
and frequency of the inverter during starting for each load torque. The
starting characteristics using proposed method are compared to that of direct
on line and V/F methods. A complete model of the system is developed using
SIMULINK/MATLAB.
Hardware Implementation of Solar Based Boost to SEPIC Converter Fed Nine Leve...IJPEDS-IAES
Multi level inverters are widely used in high power applications because of
low harmonic distortion. This paper deals with the simulation
and implementation of PV based boost to SEPIC converter with multilevel
inverter. The output of PV system is stepped up using boost to sepic
converter and it is converted into AC using a multilevel inverter.
The simulation and experimental results with the R load is presented in this
paper. The FFT analysis is done and the THD values are compared. Boost to
SEPIC converter is proposed to step up the voltage to the required value. The
experimental results are compared with the simulation results. The results
indicate that nine level inverter system has better performance than seven
level inverter system.
Transformer Less Voltage Quadrupler Based DC-DC Converter with Coupled Induct...IJPEDS-IAES
In this paper a voltage quadrupler dc-dc converter with coupled inductor
and π filter is presented. The use of the coupled inductor reduces the high
leakage inductance which is present in a transformer enabled converter.
The output ripples in the converter is reduced by providing a π filter.
The interleaved voltage quadrupler is used in this system in order to boost the
output voltage. The voltage multiplier improves the output voltage gain.
The main advantage of this system is more voltage gain when compared with
the transformer eneabled circuit and the overall efficiency of the system is
improved. The circuit is simple to control. As a final point of this research,
the simulation and the hardware investigational results are presented to
demonstrate the effectiveness of this proposed converter.
IRAMY Inverter Control for Solar Electric VehicleIJPEDS-IAES
Solar Electric Vehicles (SEV) are considered the future vehicles to solve the issues of air pollution, global warming, and the rapid decreases of the petroleum resources facing the current transportation technology. However, SEV are still facing important technical obstacles to overcome. They include batteries energy storage capacity, charging times, efficiency of the solar panels and electrical propulsion systems. Solving any of those problems and electric vehicles will compete-complement the internal combustion engines vehicles. In the present work, we propose an electrical propulsion system based on three phase induction motor in order to obtain the desired speed and torque with less power loss. Because of the need to lightweight nature, small volume, low cost, less maintenance and high efficiency system, a three phase squirrel cage induction motor (IM) is selected in the electrical propulsion system. The IM is fed from three phase inverter operated by a constant V/F control method and Space Vector Pulse Width Modulation (SVPWM) algorithm. The proposed control strategy has been implemented on the texas instruments TM320F2812 Digital Signal Processor (DSP) to generate SVPWM signal needed to trigger the gates of IGBT based inverter. The inverter used in this work is a three phase inverter IRAMY20UP60B type. The experimental results show the ability of the proposed control strategy to generate a three-phase sine wave signal with desired frequency. The proposed control strategy is experimented on a locally manufactured EV prototype. The results show that the EV prototype can be propelled to speed up to 60km/h under different road conditions.
Design and Implementation of Single Phase AC-DC Buck-Boost Converter for Powe...IJPEDS-IAES
This paper discusses the Power Factor Correction (PFC) for single phase AC-DC Buck-Boost Converter (BBC) operated in Continuous Conduction Mode (CCM) using inductor average current mode control. The proposed control technique employs Proportional-Integral (PI) controller in the outer voltage loop and the Inductor Average Current Mode Control (IACMC) in the inner current loop for PFC BBC. The IACMC has advantages such as robustness when there are large variations in line voltage and output load. The PI controller is developed by using state space average model of BBC. The simulation of the proposed system with its control circuit is implemented in MatLab/Simulink. The simulation results show a nearly unity power factor can be attained and there is almost no change in power factor when the line frequency is at various ranges. Experimental results are provided to show its validity and feasibility.
Improvement of Wind farm with PMSG using STATCOMIJPEDS-IAES
This paper studies about the dynamic performance of the Permanent Magnet Synchronous Generator with Static Synchronous Compensator (STATCOM) for Wind farm integration. A whole dynamic model of wind energy conversion system (WECS) with PMSG and STATCOM are established in a MATLAB environment. With this model the dynamic behaviour of the generator and the overall system has been studied to determine the performance of them with and without STATCOM. Final results portrays that the WECS based PMSG with STATCOM improves the transient response of the wind farm when the system is in fault.
Modeling and Control of a Doubly-Fed Induction Generator for Wind Turbine-Gen...IJPEDS-IAES
This paper presents a vector control direct (FOC) of double fed induction generator intended to control the generated stator powers. This device is intended to be implemented in a variable-speed wind-energy conversion system connected to the grid. In order to control the active and reactive power exchanged between the machine stator and the grid, the rotor is fed by a bi-directional converter. The DFIG is controlled by standard relay controllers. Details of the control strategy and system simulation were performed using Simulink and the results are presented in this here to show the effectiveness of the proposed control strategy.
A Review on Design and Development of high Reliable Hybrid Energy Systems wit...IJPEDS-IAES
Hybrid Energy system is a combination of two or more different types of energy resources. Now a day this hybrid energy system plays key role in various remote area power applications. Hybrid energy system is more reliable than single energy system. This paper deals with high reliable hybrid energy system with solar, wind and micro hydro resources. The proposed hybrid system cable of multi mode operation and high reliable due to non communicated based controllers (Droop Characteristic Control) are used for optimal power sharing. Size of battery can be reduced because hydro used as back up source and Maximum power point Tracking also applied to solar and wind energy systems.
Null Bangalore | Pentesters Approach to AWS IAMDivyanshu
#Abstract:
- Learn more about the real-world methods for auditing AWS IAM (Identity and Access Management) as a pentester. So let us proceed with a brief discussion of IAM as well as some typical misconfigurations and their potential exploits in order to reinforce the understanding of IAM security best practices.
- Gain actionable insights into AWS IAM policies and roles, using hands on approach.
#Prerequisites:
- Basic understanding of AWS services and architecture
- Familiarity with cloud security concepts
- Experience using the AWS Management Console or AWS CLI.
- For hands on lab create account on [killercoda.com](https://killercoda.com/cloudsecurity-scenario/)
# Scenario Covered:
- Basics of IAM in AWS
- Implementing IAM Policies with Least Privilege to Manage S3 Bucket
- Objective: Create an S3 bucket with least privilege IAM policy and validate access.
- Steps:
- Create S3 bucket.
- Attach least privilege policy to IAM user.
- Validate access.
- Exploiting IAM PassRole Misconfiguration
-Allows a user to pass a specific IAM role to an AWS service (ec2), typically used for service access delegation. Then exploit PassRole Misconfiguration granting unauthorized access to sensitive resources.
- Objective: Demonstrate how a PassRole misconfiguration can grant unauthorized access.
- Steps:
- Allow user to pass IAM role to EC2.
- Exploit misconfiguration for unauthorized access.
- Access sensitive resources.
- Exploiting IAM AssumeRole Misconfiguration with Overly Permissive Role
- An overly permissive IAM role configuration can lead to privilege escalation by creating a role with administrative privileges and allow a user to assume this role.
- Objective: Show how overly permissive IAM roles can lead to privilege escalation.
- Steps:
- Create role with administrative privileges.
- Allow user to assume the role.
- Perform administrative actions.
- Differentiation between PassRole vs AssumeRole
Try at [killercoda.com](https://killercoda.com/cloudsecurity-scenario/)
artificial intelligence and data science contents.pptxGauravCar
What is artificial intelligence? Artificial intelligence is the ability of a computer or computer-controlled robot to perform tasks that are commonly associated with the intellectual processes characteristic of humans, such as the ability to reason.
› ...
Artificial intelligence (AI) | Definitio
Embedded machine learning-based road conditions and driving behavior monitoringIJECEIAES
Car accident rates have increased in recent years, resulting in losses in human lives, properties, and other financial costs. An embedded machine learning-based system is developed to address this critical issue. The system can monitor road conditions, detect driving patterns, and identify aggressive driving behaviors. The system is based on neural networks trained on a comprehensive dataset of driving events, driving styles, and road conditions. The system effectively detects potential risks and helps mitigate the frequency and impact of accidents. The primary goal is to ensure the safety of drivers and vehicles. Collecting data involved gathering information on three key road events: normal street and normal drive, speed bumps, circular yellow speed bumps, and three aggressive driving actions: sudden start, sudden stop, and sudden entry. The gathered data is processed and analyzed using a machine learning system designed for limited power and memory devices. The developed system resulted in 91.9% accuracy, 93.6% precision, and 92% recall. The achieved inference time on an Arduino Nano 33 BLE Sense with a 32-bit CPU running at 64 MHz is 34 ms and requires 2.6 kB peak RAM and 139.9 kB program flash memory, making it suitable for resource-constrained embedded systems.
Advanced control scheme of doubly fed induction generator for wind turbine us...IJECEIAES
This paper describes a speed control device for generating electrical energy on an electricity network based on the doubly fed induction generator (DFIG) used for wind power conversion systems. At first, a double-fed induction generator model was constructed. A control law is formulated to govern the flow of energy between the stator of a DFIG and the energy network using three types of controllers: proportional integral (PI), sliding mode controller (SMC) and second order sliding mode controller (SOSMC). Their different results in terms of power reference tracking, reaction to unexpected speed fluctuations, sensitivity to perturbations, and resilience against machine parameter alterations are compared. MATLAB/Simulink was used to conduct the simulations for the preceding study. Multiple simulations have shown very satisfying results, and the investigations demonstrate the efficacy and power-enhancing capabilities of the suggested control system.
Design and optimization of ion propulsion dronebjmsejournal
Electric propulsion technology is widely used in many kinds of vehicles in recent years, and aircrafts are no exception. Technically, UAVs are electrically propelled but tend to produce a significant amount of noise and vibrations. Ion propulsion technology for drones is a potential solution to this problem. Ion propulsion technology is proven to be feasible in the earth’s atmosphere. The study presented in this article shows the design of EHD thrusters and power supply for ion propulsion drones along with performance optimization of high-voltage power supply for endurance in earth’s atmosphere.
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2. STRUCTURE OF TRANSFORMER CORE
Three-stage transformers contrast one from the other both in their attractive and winding
association. The attractive circuit of 3-stage transformers can take any of the structures indicated in Figures
1(a), 1(b) and 1(c). Just the instance of the transformer banks demonstrated in Figure 1(a) agrees to the
confinements forced on the magnetic circuit to permit it to be enunciated to by a solitary stage model. The
three-limb and five-limb magnetic cores demonstrated in Figures 1(a) and 1(c) is more perplexing because of
the coupling between the different limbs.
Figure 1(a). Magnetic core of three phase transformer bank
Figure 1(b). Three-limb Magnetic Core
Figure 1(c). Five-limb magnetic core
In this work, the attractive circuits of the individual stages are considered totally free, which
entirely applies just to transformer banks. Nonetheless, as this work focuses essentially on the determination
of the transient current under saturated conditions, the magnetic circuits demonstrated in Figures 1(b) and
1(c) can be approximated to three different magnetic circuits.
3. ANALYSIS OF TRANSIENT CURRENT
Transient current in transformer results from any sudden change in the charging voltage. The
transient current waveform contains a substantial and durable DC segment and harmonics [5]. It may
accomplish expansive crest qualities toward the starting rots significantly after a couple of second, yet its full
rot happens when a few seconds. A waveform of regular transient current is demonstrated in Figure 2. It
shows even harmonic without a doubt and RL balance of shifted extents regularly comprising of high
estimation of second harmonic.
Figure 2. Transient current of transformer at 100% nominal voltage
3. IJPEDS ISSN: 2088-8694
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749
4. THREE SINGLE -PHASE TRANSFORMER CONNECTED WITH TCL IN SERIES
The TCL, indicated in Figure 3, has a low resistance curl with a specific end goal to increase better
results. The arrangement TCL is straightforward and works in two modes. The principal mode is the charging
mode and the second one is the releasing mode. At the point when the transformer is empowered, one sets of
Thyristor (e.g. T1 and T4 or T2 and T3) is on, so the RL current reactor drives in arrangement with source
and transformer.
Figure 3. Equivalent circuit of three, single-phase TCLs
Under this condition, on account of the constant change in the line current, the voltage drop (LTCL
(di1 /dt)) will create a blocking impact in the circuit, so the plentifulness of the transient current lessens
significantly. The present mathematical statement in charging mode is composed, as takes after [5].
( / )
1 2
2 2) 2 2
2
( ) sin( ) sin( )
( ) ( ( ) ( )
R L t TF TF
V VVp Vp
i t e wt wt
R RR wL R wL
(1)
where TCLP RRR (Rp is the resistance in the essential side of the transformer and RTCL is the RL reactor
resistance), L = L p + LTCL + Lm (Lp is the leakage spillage inductance in the essential side of the transformer
and LTCL is the RL reactor inductance and Lm is the charging inductance of the transformer), VTF is the
forward thyristor voltage drop and is the crest plentifulness of the utility voltage. LTCL is the RL reactor
inductance and Lm is the magnetizing inductance of the transformer), VTF is the forward thyristor voltage
drop and Vp is the peak amplitude of the utility voltage.
( ) TCLi t i
arctan
Lw
R
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750
It ought to be noticed that the polarizing inductance of the transformer is not consistent and can be
partitioned into two sections: One is the soaked inductance and the second one is not-immersed inductance.
In this paper, the transformer is considered in immersion mode [6]. The charging mode proceeds until the
TCL current achieves its first crest. At that point, the releasing mode will begin and can proceed for a few
cycles. In this condition, all thyristors are on as demonstrated in Figure 3. Therefore the circle mathematical
statement can be composed as takes after
2 0.TCL
TCL TCL TCL TF
di
L R i V
dt
(2)
In the releasing mode, the TCL current is written as follows
TCL
TF
TCL
TFtLR
TCL
R
V
R
V
iei TCLTCL
22
max
)/(
(3)
After a few cycles, the abundancy of the RL reactor current in the AC structure ((diTCL/dt) = 0)
diminishes to achieve the ordinary circuit current. Thus, the TCL does not have any impressive impact on the
typical mode operation of the framework. The estimation of inductance in the TCL is critical. By expanding
LTCL, the transient current adequacy will diminish a great deal [7], so the transient current and its results can
be disposed of. There are a few restrictions to build the inductance, as indicated in (4), i.e;
max4ln 2 / 2
p TCL
TCL p m
TS TF TS TF
R R T
L L L
V V V V Ri
(4)
Where Rp is the resistance in the primary side of the transformer, RTCL is the resistance of the RL
reactor, Lp is the spillage inductance in the primary side of the transformer and Lm is the charging inductance
of the transformer, VTF is the Thyristor forward voltage drop and VTS is the normal of the redressed source
voltage. Figure 3 demonstrates the TCL for a three-stage transformer. As indicated in Figure 4, the primary
winding voltage and current of three-phase transformers, though Figure 5 displays how it can be restricted by
the TCL.
5. IJPEDS ISSN: 2088-8694
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Figure 4. Voltage and Current of Phase A, B, & C without TCL
Figure 5 Voltage and Current of Phase A, B, & C with TCL
5. PROPOSED TCL
As demonstrated in Figure3, the transient current of the three-stage transformer can be controlled by
utilizing twelve thyristor of the arrangement TCL. Through these thyristor, extensive current of the stacked
transformers streams. Consequently they are expensive and due to getting old, the voltage drop or current
swell may be expanded amid the typical operation mode. The new arrangement, which is indicated in Figure
5, just uses six thyristors as a TCL in Y-yg transformers.
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752
Figure 5. Proposed TCL connected to Y-yg transformer
The operation of the new TCL can be separated into two operation modes; charging and releasing
modes. At initial, one of the three thyristors of T1, T2 and T3 and one of the three thyristors of T4, T5 and T6
are in the ON state. At that point, the circle, which is demonstrated in Figure 6, is framed and the present can
be acquired. In this paper, the recompense current is disregarded. To identify the phenomenon, the most ideal
way is measuring the three stage voltages between the TCL and the ground [8]-[13]. This condition will
proceed until the TCL current achieves the first crest. At that point, the releasing mode will begin and can
proceed for a few cycles. For this situation, all the thyristors are in on state so the RL reactors current will be
released in circles.
Figure 6. Coil charging mode
5.1. CHARGING MODE
According to Figure 6, the circle comparison with disregarding R1 and L1 is communicated as,
Charging method of conducting coil
1 1
1 1sin( 30) 2 2 2 2LL p p TF TCL TCL
di di d
V wt R i L V L R i
dt dt dt
(5)
Differentiating (5) leads to the following equation
(6)
It is clear that
2 2 2
1 1 1 1
2 2 2
cos( 30) 2 2 2LL p p TCL TCL
di d i d i di d
wV wt R L L R
dt dtdt dt dt
7. IJPEDS ISSN: 2088-8694
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753
1 m ci t i t i t (7)
cciR
dt
d
(8)
And
dt
di
L
dt
di
di
d
dt
d m
m
m
m
*
(9)
Utilizing (7), (8) and (9), the accompanying comparison is communicated as
dt
d
L
R
dt
di
R
dt
d
m
c
c
1
2
2
(10)
Supplanting (10) in (6), prompts (11).
2 2
1 1 1 1 1
2 2
cos( 30) 2 2 2( )c
LL p p TCL TCL c
m
Rdi d i d i di di d
wV wt R L L R R
dt dt dt L dtdt dt
(11)
Comparison (5) can be revised in the accompanying structure
EwtDCi
dt
di
B
dt
id
A )sin(1
1
2
1
2
(12)
Where
C
TCLp
m
R
LL
LA
2
mTCLp
c
TCLp
m LLL
R
RR
LB 22)
2
(
2 2 2
2
2 , , 2 , 3 0, co s
( )
c m L L
p T C L L L T F
c
R L w V
C R R D V E V
DR
Using Laplace transform, (12) can be rewritten, as follows
2 '
2 2
sin( ) cos( )
( ( ) (0) (0)) ( ( ) (0)) ( )
s w E
A s I s sI I B sI s I CI s D
Ss w
(13)
Consequently
2 2 2 2 2 2 2
sin coss E
I s D D
s As Bs C s As Bs C s As Bs C
(14)
Utilizing the inverse Laplace transform, the transient current somewhere around 0 and T/4 can be dictated by
the accompanying mathematical
1 2 3 4( ) sin( )Ft Gt
m m m mi t i e i e i wt i (15)
4321 )sin()( mm
Gt
m
Ft
m iwtieieiti
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754
where
1 2 2 2 2
( ) cos( )
( ) ( )( ) ( )(
m
E DFSin Dw
i
F F G F G F w F G F w
2 2 2 2 2
sin( ) cos( )
( ) ( )( ) ( )( )
m
E DG Dw
i
G G F G F G w G F G w
23243
)22()(4
2
wwFGGFw
wD
im
4m
E
i
GF
2
4
2
B B AC
F
A
,
2
4
2
B B AC
G
A
3 2
4 2 3 2
(2 2 )cos( ) (2 ( ))sin( )
cos( )
4 ( ) (2 2 )
wFG w w F G
w F G wFG w
As given in (15), the principle a piece of the present in charging mode somewhere around 0 and T/4
comprises of two exponential and one sinusoidal segment. Since F and G are negative, these two exponential
parts will rot.
5.2. RELEASING MODE
The second method of the TCL is the releasing mode, so the circle comparison can be composed by
the accompanying mathematical statement
02
dt
di
R
dt
di
LV TCL
TCL
TCL
TCLTF
(16)
Explaining the mathematical statement for i(t) we have
( / )( ( /4))
max
2 2TCL TCLR L t T TF TF
TCL
TCL
V V
i e i
R R
(17)
Where the most extreme current imax is in charging mode as an introductory condition for (16). As is given in
(17), the first part of the mathematical statement is exponential with a negative example, so it will decay after
a few cycles.
5.3. PREFERRED VALUE FOR LTCL
Since the computation of LTCL from the quadratic mathematical statement is lengthy, by expecting
Rc huge, the levels of (5) will lessening to one. By explaining the lessened request mathematical statement,
i(t) can be communicated by the accompanying comparison
( / )
1 2
2 2) 2 2
2
( ) sin( 30 ) sin( 30 )
( ) ( ( ) ( )
R L t LL TF LL TFV V V V
i t e wt wt
R RR wL R wL
(18)
9. IJPEDS ISSN: 2088-8694
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where arctan
Lw
R
and t1 is the beginning moment. In this circumstance, substituting the imax in i (t), (18)
is communicated as [10]
)1(
2 )4/(
max
LRTTFTS
e
R
VV
i
(19)
Where T is the period of the power frequency and VTS = (2 2 / )V is the average of the rectified source
voltage.
max2
2
ln
4 RiVV
VVT
L
R
TFTS
TFTS
(20)
By, the preferred value for LTCL in three-phase Y-yg power transformers is communicated as
max
2 2
4ln(( 2 )/( 2 ))
TCL p m
TS T TS TF
RT
L L L
V V V V Ri
(21)
6. RESULTS AND DISCUSSIONS
The simulation results are completed in a MATLAB situation. The simulation parameters are given
in Table 1. Figure 7(a) and 7(b) demonstrates the transformer transient voltage and current of phase A, B and
C. Under this condition, the new TCL limits the no-load current to 800, 50 and 30 A in phases A, B and C,
separately. As indicated in Figure 4(a) and 4(b), the transient voltage and current without utilizing the TCL
can surpass past 5000A or it can achieve 100A utilizing the ordinary TCL (indicated in Figure 3). Figure 8(a)
and 8(b) demonstrates the simulation result of three phase voltage and current without utilizing of transient
current limiter (TCL) and double tuned harmonic filter.
Figure 7 Voltages and Currents of Phase A, B, & C with TCL
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Table 1. Simulation parameters
Parameter Value Parameter Value
Rp 0.65Ω LTCL 0.8H
R1 0.05Ω RTCL 0.03Ω
Lp 0.0025H VTF 10V
L1 0.001H ω 314.15
Lm 0.9H S 20 MVA
Rc 2000Ω VLL 2000(Vrms)
Figure 8(a). Simulation outcome of three phase - Figure 8(b). Simulation outcome of three phase -
voltage without TCL and harmonic filter. current without TCL and harmonic filter.
Figure 9(a), 9(b) and 10(a), 10(b) delineate the harmonic investigation for the transformer voltage
and current in three phases, with utilizing TCL. An examination of these figures demonstrates that utilizing
the proposed TCL comes about as a part of the lessening of the abundancy of the transient voltage and
current by weakening the RL segment.
Figure 9(a). Simulation outcome of three phase - Figure 9(b). Simulation outcome of three phase -
voltage with TCL and harmonic filter. current with TCL and harmonic filter.
Figure 10(a) Total Harmonic Distortion without TCL Figure 10(b) Total Harmonic Distortion with TCL
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A Novel Transient Current Limiter Based on Three Phase Thyristor Bridge for Y-yg .... (Alok Kumar S.)
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7. CONCLUSION
In this paper, a novel TCL, taking into account a three-stage thyristor bridge for the alleviation of Y-
yg transformers transient voltage and current has been proposed. The proposed TCL has a basic topology,
does not require any controlling circuit and uses less thyristors than different TCLs. What's more, it prompts
lower swell and voltage drop and lower burden voltage mutilation for transformers. The exploratory and
recreation results demonstrate the viability of the proposed TCL. What's more, it ought to be noticed that the
authors have concentrated on the essential winding of this transformer. The secondary side is open circuit. So
it can be said that the outcomes can be the same for Y-yg transformers which are regular in the dispersion
system.
REFERENCES
[1] Manisha Wani, Kalyani Kurundkar, MP. Bhawalkar, “Use of Power Electronic Converters to Suppress Transformer
Inrush Current”, IEEE International Conference on Power Electronics, Drives and Energy Systems, 2012.
[2] Chiesa, N., Kristian, H., “Novel approach for reducing transformer inrush currents: laboratory measurements,
analytical interpretation and simulation studies”, IEEE Trans. Power Deliv., vol/issue: 25(4), pp. 2609–2616, 2010.
[3] Brunke, JH., Frohlich, K., “Elimination of transformer inrush currents by controlled switching – part I: theoretical
considerations”, IEEE Trans. Power Deliv., vol/issue: 16(2), pp. 276–280, 2001.
[4] M. Tarafdar Hagh, M. Abapour, “DC Reactor Type Transformer Inrush Current Limiter”, IEEE Electric Power
Applications, IET, vol/issue: 1(5), pp. 808-814, 2007.
[5] M. Jawad Ghorbani, Hossein Mokhtari, “Impact of Harmonics on Power Quality and Losses in Power Distribution
Systems”, International Journal of Electrical and Computer Engineering, vol/issue: 5(1), pp. 166-174, 2015.
[6] Somlal Jarupula, Narsimha Rao Vutlapalli, “Power Quality Improvement in Distribution System using ANN Based
Shunt Active Power Filter”, International Journal of Power Electronics and Drive Systems (IJPEDS), vol/issue:
5(4), pp. 568-575, 2015.
[7] F. Ali Asghar, KP. Basu, “Reduction of three phase transformer magnetizing inrush current by use of point on wave
switching ”, IEEE Student Conference on Research and Development, Malaysia, Nov. 16-18, pp. 368-370, 2009.
[8] Taylor DI., Law JD., Johnson BK., Fischer N., “Single-phase transformer inrush current reduction using
prefluxing“, IEEE Transactions on Power Delivery, vol/issue: 27(1), pp. 245-252, 2012.
[9] SMM adani, M. Rostami, GB. Gharehpetian, R. Haghmaram, ”Inrush current limiter based on three-phase diode
bridge for Y-yg transformers”, IET Electr. Power Appl., vol/issue: 6(6), pp. 345–352, 2012.
[10] Ashkan Farazmand, Francisco de León, Kuang Zhang, Saeed Jazebi, “Analysis, Modeling, and Simulation of the
Phase-Hop Condition in Transformers: The Largest Inrush Currents”, IEEE Transactions On Power Delivery,
vol/issue: 29(4), 2014.
[11] Lian, KL., Perkins, BK., “Harmonic analysis of a three-phase diode bridge rectifier based on sampled-data model”,
IEEE Trans. Power Deliv., vol. 23, pp. 1088–1096, 2008.
[12] Francisco de León, Ashkan Farazmand, Pekir Joseph, ”Comparing the T and Equivalent Circuits for the Calculation
of Transformer Inrush Currents“, IEEE Transactions on Power Delivery, vol/issue: 27(4), 2012.
[13] Gomes Marafao, JA., Pomilio, JA., “Improved three-phase high-quality rectifier with line-commutated switches”,
IEEE Trans. Power Electron., vol/issue: 19(3), pp. 640–648, 2004.
BIOGRAPHIES OF AUTHORS
Alok Kumar Shrivastav received his B.Tech degree in Electrical & Electronics Engineering from
West Bengal University of Technology, West Bengal, India, in 2009, the M.Tech degree in
Electrical Engineering from NIT Durgapur, West Bengal, India, in 2013, and presently pursuing
Ph.D. programme at the Department of Electrical Engineering, Indian School of Mines,
Dhanbad-826004, India. He is presently Assistant Professor, Batanagar Institute of Engineering,
Management and Science, Maheshtala, Kolkata. His special field of interest is in power quality
in distribution system, power folw monitoring and stability analysis.
Pradip Kumar Sadhu received his Bachelor, Post-Graduate and Ph.D. (Engineering) degrees in
1997, 1999 and 2002 respectively in Electrical Engg. from Jadavpur University, West Bengal,
India. Currently, he is working as a Professor in Electrical Engineering Department of Indian
School of Mines, Dhanbad, India. He has total experience of 18 years in teaching and industry.
He has four Patents. He has several journal and conference publications in national and
international level. He is principal investigator of few Govt. funded projects. He has guided a
large no. of doctoral candidates and M. Tech students. His current areas of interest are power
electronics applications, application of high frequency converter, energy efficient devices,
energy efficient drives, computer aided power system analysis, condition monitoring, lighting
and communication systems for underground coal mines.
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Ankur Ganguly received his B.E. degree in Electrical & Electronics Engineering from
Mangalore University, Karnataka, India, in 2000, the M.Tech. degree in Biomedical Engineering
from MAHE, Manipal, Karnataka, India, in 2002, and the Ph.D. degree in Engineering from
Jadavpur University, Kolkata, India, in 2011. He is presently Professor and Principal, Batanagar
Institute of Engineering, Management and Science, Maheshtala, Kolkata. His research interests
include biomedical signal processing, chaos theory, heart rate variability. At present, he is
engaged in Non Linear applications and chaos theory in HRV and electrical machines.
Nitai Pal received his B.Tech. and M.Tech. degrees in Electrical Engineering from University of
Calcutta, West Bengal, India. He received his Ph.D. (Engineering) from Jadavpur University,
West Bengal, India. He has total experience of twelve years in teaching. He is currently working
as an Assistant Professor in the Department of Electrical Engineering, Indian School of Mines,
Dhanbad, Jharkhand, India. He has several publications in Journals, International & National
conferences. He is the co-investigator of Govt funded project. His current areas of interest are
Power electronics application, application of high frequency converters, energy efficient devices,
energy efficient drives, lighting and communication systems for underground coal mines.