This paper presented with problems related with voltage flicker in power
system networks. Several international standard issued to control the voltage
flicker are briefly described and some important methods to analyse
electrical circuits with sinusoidal and non-sinusoidal waveforms are
introduced and evaluated. One of these methods-Cockcroft Walton Voltage
Multiplier (CWVM) has been used to increase the voltage of a filter, which is
also described in this paper as a practical application. The filter can
compensate for harmonic currents, power factor, and unbalance voltage.The
simulation results using Multisimare presented, showing that good dynamic
and steady-state response can be achieved with this approach.
Application of SVC on IEEE 6 Bus System for Optimization of Voltage Stabilityijeei-iaes
The problem of voltage or current unbalance is gaining more attention recently with the increasing awareness on power quality. Excessive unbalance among the phase voltages or currents of a three phase power system has always been a concern to expert power engineers. The study of shunt connected FACTS devices is an associated field with the problem of reactive power compensation related problems in today’s world. In this study an IEEE-6 bus system has been studied & utilized in order to study the shunt operation of FACTS controller to optimize the voltage stability
Modeling and Analysis of Transformerless High Gain Buck-boost DC-DC ConvertersIAES-IJPEDS
This paper proposes a transfomerless switched capacitor buck boost converter model, which provides higher voltage gain and higher efficiency when compared to the conventional buck boost converter. The averaged model based on state- space description is analyzed in the paper. The simulation results are presented to confirm the capability of the converter to generate high voltage ratios. The comparison between the proposed model and the traditional model is also provided to reveal the improvement. The proposed converter is suitable for for a wide application which requires high step-up DC-DC converters such as DC micro-grids and solar electrical energy.
The transmission of electric power has to take place in the most efficient way in addition to providing flexibility in the process. Flexible A.C. Transmission System (FACTS) promotes the use of static controllers to enhance the controllability and increase the power transfer capability. Providing reactive shunt compensation with shunt-connected capacitors and reactors is a well-established technique to get a better voltage profile in a power system. Shunt Capacitors are inexpensive but lack dynamic capabilities, thus some form of dynamically controlled reactive power compensation becomes essential. In this paper, three phase Distribution Static Var Compensator (D-SVC) has been developed and studied under different conditions. Open loop mode and closed loop mode of operation of D-SVC is simulated and studied. The work presented here is very much useful for distribution system, for effective reactive power management and better Voltage control.
International Journal of Engineering Research and Development (IJERD)IJERD Editor
journal publishing, how to publish research paper, Call For research paper, international journal, publishing a paper, IJERD, journal of science and technology, how to get a research paper published, publishing a paper, publishing of journal, publishing of research paper, reserach and review articles, IJERD Journal, How to publish your research paper, publish research paper, open access engineering journal, Engineering journal, Mathemetics journal, Physics journal, Chemistry journal, Computer Engineering, Computer Science journal, how to submit your paper, peer reviw journal, indexed journal, reserach and review articles, engineering journal, www.ijerd.com, research journals,
yahoo journals, bing journals, International Journal of Engineering Research and Development, google journals, hard copy of journal
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.
An Efficient High Gain DC-DC Converter for Automotive ApplicationsIJPEDS-IAES
This paper presents a high gain DC-DC converter which uses a clamp circuit
to achieve soft switching. The proposed converter is designed to supply a
high intensity discharge (HID) lamp used in automobile head lamps. The
converter operates from a 12V input supply and provides an output voltage
of 120V at 35W output power. A clamp circuit consisting of a clamp
capacitor, clamp switch and resonant inductor will help to achieve zero
voltage switching (ZVS) of the both main and clamp switches. The practical
performance of the converter was validated through experimental results.
Results obtained from the prototype hardware prove that the converter meets
the requirements of HID lamp application and can be a very good alternative
to existing converters.
Design implementation and comparison of various cmos charge pumpsIAEME Publication
A charge pump is a kind of DC to DC converter that uses capacitors as energy storage
elements to create a higher or lower voltage power source. Charge pumps make use of switching
devices for controlling the connection of voltage to the capacitor. The use of charge transfer switches
(CTSs) can improve the voltage pumping gain. Applying dynamic control to the CTSs can reduce
reverse currents. This paper includes voltage and power analysis of various charge pump circuits.
And a comparison is drawn between the three charge pumps analyzed.
Application of SVC on IEEE 6 Bus System for Optimization of Voltage Stabilityijeei-iaes
The problem of voltage or current unbalance is gaining more attention recently with the increasing awareness on power quality. Excessive unbalance among the phase voltages or currents of a three phase power system has always been a concern to expert power engineers. The study of shunt connected FACTS devices is an associated field with the problem of reactive power compensation related problems in today’s world. In this study an IEEE-6 bus system has been studied & utilized in order to study the shunt operation of FACTS controller to optimize the voltage stability
Modeling and Analysis of Transformerless High Gain Buck-boost DC-DC ConvertersIAES-IJPEDS
This paper proposes a transfomerless switched capacitor buck boost converter model, which provides higher voltage gain and higher efficiency when compared to the conventional buck boost converter. The averaged model based on state- space description is analyzed in the paper. The simulation results are presented to confirm the capability of the converter to generate high voltage ratios. The comparison between the proposed model and the traditional model is also provided to reveal the improvement. The proposed converter is suitable for for a wide application which requires high step-up DC-DC converters such as DC micro-grids and solar electrical energy.
The transmission of electric power has to take place in the most efficient way in addition to providing flexibility in the process. Flexible A.C. Transmission System (FACTS) promotes the use of static controllers to enhance the controllability and increase the power transfer capability. Providing reactive shunt compensation with shunt-connected capacitors and reactors is a well-established technique to get a better voltage profile in a power system. Shunt Capacitors are inexpensive but lack dynamic capabilities, thus some form of dynamically controlled reactive power compensation becomes essential. In this paper, three phase Distribution Static Var Compensator (D-SVC) has been developed and studied under different conditions. Open loop mode and closed loop mode of operation of D-SVC is simulated and studied. The work presented here is very much useful for distribution system, for effective reactive power management and better Voltage control.
International Journal of Engineering Research and Development (IJERD)IJERD Editor
journal publishing, how to publish research paper, Call For research paper, international journal, publishing a paper, IJERD, journal of science and technology, how to get a research paper published, publishing a paper, publishing of journal, publishing of research paper, reserach and review articles, IJERD Journal, How to publish your research paper, publish research paper, open access engineering journal, Engineering journal, Mathemetics journal, Physics journal, Chemistry journal, Computer Engineering, Computer Science journal, how to submit your paper, peer reviw journal, indexed journal, reserach and review articles, engineering journal, www.ijerd.com, research journals,
yahoo journals, bing journals, International Journal of Engineering Research and Development, google journals, hard copy of journal
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.
An Efficient High Gain DC-DC Converter for Automotive ApplicationsIJPEDS-IAES
This paper presents a high gain DC-DC converter which uses a clamp circuit
to achieve soft switching. The proposed converter is designed to supply a
high intensity discharge (HID) lamp used in automobile head lamps. The
converter operates from a 12V input supply and provides an output voltage
of 120V at 35W output power. A clamp circuit consisting of a clamp
capacitor, clamp switch and resonant inductor will help to achieve zero
voltage switching (ZVS) of the both main and clamp switches. The practical
performance of the converter was validated through experimental results.
Results obtained from the prototype hardware prove that the converter meets
the requirements of HID lamp application and can be a very good alternative
to existing converters.
Design implementation and comparison of various cmos charge pumpsIAEME Publication
A charge pump is a kind of DC to DC converter that uses capacitors as energy storage
elements to create a higher or lower voltage power source. Charge pumps make use of switching
devices for controlling the connection of voltage to the capacitor. The use of charge transfer switches
(CTSs) can improve the voltage pumping gain. Applying dynamic control to the CTSs can reduce
reverse currents. This paper includes voltage and power analysis of various charge pump circuits.
And a comparison is drawn between the three charge pumps analyzed.
This paper presents a comprehensive and systematic approach in developing a new switching look-up table for direct power control (DPC) strategy applied to the three-phase grid connected three-level neutral-point clamped (3L-NPC) pulse width modulated (PWM) rectifier. The term of PWM rectifier used in this paper is also known as AC-DC converter. The approach provides detailed information regarding the effects of each multilevel converter space vector to the distribution of input active and reactive power in the converter system. Thus, the most optimal converter space vectors are able to be selected by the switching look-up table, allowing smooth control of the active and reactive powers for each sector. In addition, the proposed DPC utilizes an NPC capacitor balanced strategy to enhance the performance of front-end AC-DC converter during load and supply voltage disturbances. The steady state as well as the dynamic performances of the proposed DPC are presented and analyzed by using MATLAB/Simulink software. The results show that the AC-DC converter utilizing the new look-up table is able to produce almost sinusoidal line currents with lower current total harmonic distortion, unity power factor operation, adjustable DC-link output voltage and good dynamic response during load disturbance.
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.
Analysis of Six Active Power Control Strategies of Interconnected Grids with ...Power System Operation
In this paper, the generator angle stability of several active power control schemes of a
voltage-source converter (VSC)-based high-voltage DC (HVDC) is evaluated for two interconnected
AC systems. Excluding frequency control, there has been no detailed analysis of interconnected grids
depending upon the converter power control, so six different types of active power control of the
VSC-HVDC are defined and analyzed in this paper. For each TSO (transmission system operator),
the applicable schemes of two kinds of step control and four kinds of ramp-rate control with a droop
characteristic are included in this research. Furthermore, in order to effectively evaluate the angle
stability, the Generators-VSC Interaction Factor (GVIF) index is newly implemented to distinguish
the participating generators (PGs) group which reacts to the converter power change. As a result,
the transient stabilities of the two power systems are evaluated and the suitable active power control
strategies are determined for two TSOs. Simulation studies are performed using the PSS®E program
to analyze the power system transient stability and various active power control schemes of the
VSC-HVDC. The results provide useful information indicating that the ramp-rate control shows a
more stable characteristic than the step-control for interconnected grids; thus, a converter having a
certain ramp-rate slope similar to that of the other generator shows more stable results in several cases.
A High Performance PWM Voltage Source Inverter Used for VAR Compensation and ...IJMER
International Journal of Modern Engineering Research (IJMER) is Peer reviewed, online Journal. It serves as an international archival forum of scholarly research related to engineering and science education.
A Three Phase D-STATCOM to Compensate AC and DC loads by using Fuzzy Logic DC...IJMTST Journal
A Fuzzy Logic control the transient response of the distribution static compensator (D-STATCOM) is very
important while compensating rapidly varying unbalanced and nonlinear loads. Any change in the load
affects the dc-link voltage directly. The sudden removal of load would result in an increase in the dc-link
voltage above the reference value; where as a sudden increase in load would reduce the dc-link voltage
below its reference value. The proper operation of D-STATCOM requires variation of the dc-link voltage within
the prescribed limits. Conventionally, a proportional integral (PI) controller is used to maintain the dc-link
voltage to the reference value. A Fuzzy Logic controls the transient response of the distribution static
compensator (D-STATCOM) is very important while compensating rapidly varying unbalanced and nonlinear
loads. It uses deviation of the capacitor voltage from its reference value as its input. However, the transient
response of the conventional PI dc-link voltage controller is slow. In this paper, a fast-acting dc-link voltage
controller based on the energy of a dc-link capacitor is proposed. Mathematical equations are given to
compute the gains of the conventional controller based on fast-acting dc-link voltage controllers to achieve
similar fast transient response. The detailed simulation and experimental studies are carried out to validate
the proposed controller.
This paper proposes a non-isolated soft-switching bidirectional dc/dc converter for interfacing energy storage in DC microgrid. The proposed converter employs a half-bridge boost converter at input port followed by a LCC resonant tank to assist in soft-switching of switches and diodes, and finally a voltage doubler circuit at the output port to enhance the voltage gain by two times. The LCC resonant circuit also adds a suitable voltage gain to the converter. Therefore, overall high voltage gain of the converter is obtained without a transformer or large number of multiplier circuit. For operation in buck mode, the high side voltage is divided by half with capacitive divider to gain higher step-down ratio. The converter is operated at high frequency to obtain low output voltage ripple, reduced magnetics and filters. Zero voltage turn-on is achieved for all switches and zero current turn-on and turn-off is achieved for all diodes in both modes i.e., buck/boost operation. Voltage stress across switches and diode is clamped naturally without external snubber circuit. An experimental prototype has been designed, built and tested in the laboratory to verify the performance of the proposed converter.
Reparation of Inductive Power in Power System by the use of FACTS devicesIJMTST Journal
This paper presents a shunt type FACTS device connected across the load to improve the power flow and
to maintain the reactive power in real data transmission line power system using MiPower software. The
main objective of this work is to maintain the voltage stability of steady-state bus voltages and reactive
power flows in transmission system with and without FACTS controller. FACTS devices are capable of
controlling the active and reactive power flows in a transmission line by controlling its series and shunt
parameters. This paper presents a steady state model of Static VAR Compensator (SVC) controller in the
power system for stability enhancement. Benefits of FACTS controllers to power system are also discussed.
In this work real data system has been considered for load flow analysis and also to incorporate the SVC
controller in the system
Dynamic Voltage Conditioner, a New Concept for Smart Low-Voltage Distribution...Asoka Technologies
Power Quality (PQ) improvement in distribution level is an increasing concern in modern electrical power systems. One of the main problems in LV networks is related to load voltage stabilization close to the nominal value. Usually this problem is solved by Smart Distribution Transformers, Hybrid Transformers and Solid-state Transformers, but also Dynamic Voltage Conditioner (DVC) can be an innovative and a cost effective solution. The paper introduces a new control method of a single-phase DVC system able to compensate these long duration voltage drifts. For these events, it is mandatory to avoid active power exchanges so, the controller is designed to work with non-active power only. Operation limits for quadrature voltage injection control is formulated and reference voltage update procedure is proposed to guarantee its continuous operating. DVC performance for main voltage and load variation is examined. Proposed solution is validated with simulation study and experimental laboratory tests. Some simulation and experimental results are illustrated to show the prototype device’s performance.
Analysis and characterization of different high density on chip switched capa...Aalay Kapadia
Power converter is a key component in micro-scale energy harvesting systems. Micro-scale energy harvesting has become an increasingly viable and promising area for powering ultra-low power systems. Switched-capacitor (SC) power converters that use capacitors as energy storage elements offer much better power density than switched-inductor counterparts and are thus attractive in low-power area-constrained applications. Switched-capacitor (SC) converters have shown tremendous promise in this regard due to favorable device utilization and scaling trends, and the emergence of high-density silicon-compatible capacitor technologies. With the rising integration levels used to increase digital processing performance, there is a clear need for multiple independent on-chip supplies in order to support per-IP or block power management. The growing demand for both performance and battery life in portable consumer electronics requires SoCs and power management circuits to be small, efficient, and dynamically powerful. This project first reviews various design techniques for implementing high density On-chip Switched-capacitor (SC) power converters and secondly suggests the best technique to solve aspects of power converter design: Area Density, Power Consumption & Efficiency.
ENHANCEMENT OF ACTIVE POWER FLOW CAPACITY OF A TRANSMISSION LINE USING MSC‐TC...ijiert bestjournal
This paper represents the MSC-TCR scheme of shun t compensation used in FACTS. The laboratory setup of the SVC circuit using a Thyristor controlled reactor in parallel with mechanically switched capacitor will discussed in this paper. Results from the lab setup to exhibit firing angle adjustment to inject or absorb VAr into the system will also be described. During the process,losses happened are also discussed.
This paper investigates the performance of line commutated converter (LCC) based monopolar
HVDC transmission system feeding a weak AC network with hybrid reactive power compensators (RPC’s) at the
inverter AC side. The hybrid compensator is an equal mix of any two of the following compensators:
synchronous compensator (SC); static var compensator (SVC); static synchronous compensator (STATCOM).
The HVDC transmission system model is implemented in the Matlab with the firefly algorithm based optimal
proportional integral (PI) controller for rectifier and inverter control. The transient performances of hybrid
RPC’s (SC+SVC, SVC+STATCOM and SC+STATCOM) are judged under various fault conditions and the
outcomes are compared with the performance of the SC, SVC and STATCOM to highlight the supremacy of the
hybrid compensators. The simulation results validate that the equal mix of SC and STATCOM has a steady and
fastest response. The results also demonstrate the superiority of the firefly algorithm based optimal PI
controller over the conventional PI controller. The harmonic analysis is also carried out under steady state
operation to assure the quality of power supply on the inverter AC side
Implementation Of Thyristor Controlled Series Capacitor (TCSC) In Transmissio...IJERA Editor
A grid of transmission lines operating at high or extra high voltages is required to transmit power from
generating stations to load. In addition to transmission lines that carry power from source to load, modern power
systems are highly interconnected for economic reasons. The large interconnected transmission networks are
prone to faults due to the lightning discharges and reduce insulation strength. Changing of loads and atmosphere
conditions are unpredictable factors. This may cause overloading of lines due to which voltage collapse takes
place. These problems can be eased by providing sufficient margin of working parameters and power transfer,
but it is not possible due to expansion of transmission network. Still the required margin is reduced by
introduction of fast dynamic control over reactive and active power by high power electronic controllers. This
paper describes about implementation of Thyristor Controlled Series Capacitor (TCSC) in transmission line
model in order to enhance power flow at the receiving end. The triggering pulses to the thyristor are given using
Arduino.
Coautor en Revista JCR, International Transactions on Electrical Energy Systems. Título; Analysis of the behavior of MVDC system in a distribution grid compared to a UPFC system
An intrinsic problem with neutral point clamped (NPC) multilevel inverters (MLI) is unbalance of capacitor voltage. There are many mitigation techniques well established in the literature to balance the neutral point voltage for 3-level inverter. These techniques employ either Carrier based pulse width modulation (CBPWM), Space vector pulse width modulation (SVPWM) or hybrid of both the PWM techniques. Balancing becomes complicated as the level of the inverter increases due to addition of capacitor junctions. The imbalance in capacitor voltages may cause uneven voltage distribution among switching devices and sometimes may cause failure. It also increases harmonic content in its output waveform. This paper develops new modulation scheme for balancing capacitor voltages for Five-level inverter .The scheme is a hybrid PWM which is a combination of both CBPWM and SVPWM techniques. As per this scheme CBPWM is applied to meet the load demand and at the zero crossings of the reference signal, CBPWM is blocked and for one carrier cycle. During this SVPWM is applied with appropriate switching state selection to neutralize the imbalance in capacitor voltage.
A REVIEW ON EVALUATION OF PV MODELS BASED ON AN INTEGRATION USING A NEW CONFI...ijiert bestjournal
The effect of linear imbalances and nonlinear loads on the voltage balance of the neutral-point- clamped converters is described in this paper. The Neutral-Point-Clamped inverters are used in the multilevel inverters for high power application s. In this paper a three level NPC inverter that couple accommodate with solar photovoltaic (PV) and battery storage in grid connected system. The three level space vector modulation technique (SVPWM) is proposed. The SVPWM correct the ac voltage under unbalance dc voltage condition .SV-PWM strategy makes it possible to control the neutral point voltage by optimum choice of switch sequence for any position and length of output voltage vector. The control scheme has capability to control the power delivery between the solar PV,battery,and grid,it simulta neously provides maximum power point tracking (MPPT) operation for the solar PV. The res ults of matlab modeling of the system detail the comparative operation of inverter topologies wh ich are the conventional two level inverters and multilevel inverter topology to reduce total ha rmonic distortions in grid voltage and electromagnetic interference. Three-level NPC volta ge source inverter that can integrate both renewable energy and battery storage on the dc side of the inverter has been presented. The effectiveness of the proposed methodology is invest igated by the simulation of several scenarios,including battery charging and discharging with dif ferent levels of solar irradiation.
This paper presents a comprehensive and systematic approach in developing a new switching look-up table for direct power control (DPC) strategy applied to the three-phase grid connected three-level neutral-point clamped (3L-NPC) pulse width modulated (PWM) rectifier. The term of PWM rectifier used in this paper is also known as AC-DC converter. The approach provides detailed information regarding the effects of each multilevel converter space vector to the distribution of input active and reactive power in the converter system. Thus, the most optimal converter space vectors are able to be selected by the switching look-up table, allowing smooth control of the active and reactive powers for each sector. In addition, the proposed DPC utilizes an NPC capacitor balanced strategy to enhance the performance of front-end AC-DC converter during load and supply voltage disturbances. The steady state as well as the dynamic performances of the proposed DPC are presented and analyzed by using MATLAB/Simulink software. The results show that the AC-DC converter utilizing the new look-up table is able to produce almost sinusoidal line currents with lower current total harmonic distortion, unity power factor operation, adjustable DC-link output voltage and good dynamic response during load disturbance.
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.
Analysis of Six Active Power Control Strategies of Interconnected Grids with ...Power System Operation
In this paper, the generator angle stability of several active power control schemes of a
voltage-source converter (VSC)-based high-voltage DC (HVDC) is evaluated for two interconnected
AC systems. Excluding frequency control, there has been no detailed analysis of interconnected grids
depending upon the converter power control, so six different types of active power control of the
VSC-HVDC are defined and analyzed in this paper. For each TSO (transmission system operator),
the applicable schemes of two kinds of step control and four kinds of ramp-rate control with a droop
characteristic are included in this research. Furthermore, in order to effectively evaluate the angle
stability, the Generators-VSC Interaction Factor (GVIF) index is newly implemented to distinguish
the participating generators (PGs) group which reacts to the converter power change. As a result,
the transient stabilities of the two power systems are evaluated and the suitable active power control
strategies are determined for two TSOs. Simulation studies are performed using the PSS®E program
to analyze the power system transient stability and various active power control schemes of the
VSC-HVDC. The results provide useful information indicating that the ramp-rate control shows a
more stable characteristic than the step-control for interconnected grids; thus, a converter having a
certain ramp-rate slope similar to that of the other generator shows more stable results in several cases.
A High Performance PWM Voltage Source Inverter Used for VAR Compensation and ...IJMER
International Journal of Modern Engineering Research (IJMER) is Peer reviewed, online Journal. It serves as an international archival forum of scholarly research related to engineering and science education.
A Three Phase D-STATCOM to Compensate AC and DC loads by using Fuzzy Logic DC...IJMTST Journal
A Fuzzy Logic control the transient response of the distribution static compensator (D-STATCOM) is very
important while compensating rapidly varying unbalanced and nonlinear loads. Any change in the load
affects the dc-link voltage directly. The sudden removal of load would result in an increase in the dc-link
voltage above the reference value; where as a sudden increase in load would reduce the dc-link voltage
below its reference value. The proper operation of D-STATCOM requires variation of the dc-link voltage within
the prescribed limits. Conventionally, a proportional integral (PI) controller is used to maintain the dc-link
voltage to the reference value. A Fuzzy Logic controls the transient response of the distribution static
compensator (D-STATCOM) is very important while compensating rapidly varying unbalanced and nonlinear
loads. It uses deviation of the capacitor voltage from its reference value as its input. However, the transient
response of the conventional PI dc-link voltage controller is slow. In this paper, a fast-acting dc-link voltage
controller based on the energy of a dc-link capacitor is proposed. Mathematical equations are given to
compute the gains of the conventional controller based on fast-acting dc-link voltage controllers to achieve
similar fast transient response. The detailed simulation and experimental studies are carried out to validate
the proposed controller.
This paper proposes a non-isolated soft-switching bidirectional dc/dc converter for interfacing energy storage in DC microgrid. The proposed converter employs a half-bridge boost converter at input port followed by a LCC resonant tank to assist in soft-switching of switches and diodes, and finally a voltage doubler circuit at the output port to enhance the voltage gain by two times. The LCC resonant circuit also adds a suitable voltage gain to the converter. Therefore, overall high voltage gain of the converter is obtained without a transformer or large number of multiplier circuit. For operation in buck mode, the high side voltage is divided by half with capacitive divider to gain higher step-down ratio. The converter is operated at high frequency to obtain low output voltage ripple, reduced magnetics and filters. Zero voltage turn-on is achieved for all switches and zero current turn-on and turn-off is achieved for all diodes in both modes i.e., buck/boost operation. Voltage stress across switches and diode is clamped naturally without external snubber circuit. An experimental prototype has been designed, built and tested in the laboratory to verify the performance of the proposed converter.
Reparation of Inductive Power in Power System by the use of FACTS devicesIJMTST Journal
This paper presents a shunt type FACTS device connected across the load to improve the power flow and
to maintain the reactive power in real data transmission line power system using MiPower software. The
main objective of this work is to maintain the voltage stability of steady-state bus voltages and reactive
power flows in transmission system with and without FACTS controller. FACTS devices are capable of
controlling the active and reactive power flows in a transmission line by controlling its series and shunt
parameters. This paper presents a steady state model of Static VAR Compensator (SVC) controller in the
power system for stability enhancement. Benefits of FACTS controllers to power system are also discussed.
In this work real data system has been considered for load flow analysis and also to incorporate the SVC
controller in the system
Dynamic Voltage Conditioner, a New Concept for Smart Low-Voltage Distribution...Asoka Technologies
Power Quality (PQ) improvement in distribution level is an increasing concern in modern electrical power systems. One of the main problems in LV networks is related to load voltage stabilization close to the nominal value. Usually this problem is solved by Smart Distribution Transformers, Hybrid Transformers and Solid-state Transformers, but also Dynamic Voltage Conditioner (DVC) can be an innovative and a cost effective solution. The paper introduces a new control method of a single-phase DVC system able to compensate these long duration voltage drifts. For these events, it is mandatory to avoid active power exchanges so, the controller is designed to work with non-active power only. Operation limits for quadrature voltage injection control is formulated and reference voltage update procedure is proposed to guarantee its continuous operating. DVC performance for main voltage and load variation is examined. Proposed solution is validated with simulation study and experimental laboratory tests. Some simulation and experimental results are illustrated to show the prototype device’s performance.
Analysis and characterization of different high density on chip switched capa...Aalay Kapadia
Power converter is a key component in micro-scale energy harvesting systems. Micro-scale energy harvesting has become an increasingly viable and promising area for powering ultra-low power systems. Switched-capacitor (SC) power converters that use capacitors as energy storage elements offer much better power density than switched-inductor counterparts and are thus attractive in low-power area-constrained applications. Switched-capacitor (SC) converters have shown tremendous promise in this regard due to favorable device utilization and scaling trends, and the emergence of high-density silicon-compatible capacitor technologies. With the rising integration levels used to increase digital processing performance, there is a clear need for multiple independent on-chip supplies in order to support per-IP or block power management. The growing demand for both performance and battery life in portable consumer electronics requires SoCs and power management circuits to be small, efficient, and dynamically powerful. This project first reviews various design techniques for implementing high density On-chip Switched-capacitor (SC) power converters and secondly suggests the best technique to solve aspects of power converter design: Area Density, Power Consumption & Efficiency.
ENHANCEMENT OF ACTIVE POWER FLOW CAPACITY OF A TRANSMISSION LINE USING MSC‐TC...ijiert bestjournal
This paper represents the MSC-TCR scheme of shun t compensation used in FACTS. The laboratory setup of the SVC circuit using a Thyristor controlled reactor in parallel with mechanically switched capacitor will discussed in this paper. Results from the lab setup to exhibit firing angle adjustment to inject or absorb VAr into the system will also be described. During the process,losses happened are also discussed.
This paper investigates the performance of line commutated converter (LCC) based monopolar
HVDC transmission system feeding a weak AC network with hybrid reactive power compensators (RPC’s) at the
inverter AC side. The hybrid compensator is an equal mix of any two of the following compensators:
synchronous compensator (SC); static var compensator (SVC); static synchronous compensator (STATCOM).
The HVDC transmission system model is implemented in the Matlab with the firefly algorithm based optimal
proportional integral (PI) controller for rectifier and inverter control. The transient performances of hybrid
RPC’s (SC+SVC, SVC+STATCOM and SC+STATCOM) are judged under various fault conditions and the
outcomes are compared with the performance of the SC, SVC and STATCOM to highlight the supremacy of the
hybrid compensators. The simulation results validate that the equal mix of SC and STATCOM has a steady and
fastest response. The results also demonstrate the superiority of the firefly algorithm based optimal PI
controller over the conventional PI controller. The harmonic analysis is also carried out under steady state
operation to assure the quality of power supply on the inverter AC side
Implementation Of Thyristor Controlled Series Capacitor (TCSC) In Transmissio...IJERA Editor
A grid of transmission lines operating at high or extra high voltages is required to transmit power from
generating stations to load. In addition to transmission lines that carry power from source to load, modern power
systems are highly interconnected for economic reasons. The large interconnected transmission networks are
prone to faults due to the lightning discharges and reduce insulation strength. Changing of loads and atmosphere
conditions are unpredictable factors. This may cause overloading of lines due to which voltage collapse takes
place. These problems can be eased by providing sufficient margin of working parameters and power transfer,
but it is not possible due to expansion of transmission network. Still the required margin is reduced by
introduction of fast dynamic control over reactive and active power by high power electronic controllers. This
paper describes about implementation of Thyristor Controlled Series Capacitor (TCSC) in transmission line
model in order to enhance power flow at the receiving end. The triggering pulses to the thyristor are given using
Arduino.
Coautor en Revista JCR, International Transactions on Electrical Energy Systems. Título; Analysis of the behavior of MVDC system in a distribution grid compared to a UPFC system
An intrinsic problem with neutral point clamped (NPC) multilevel inverters (MLI) is unbalance of capacitor voltage. There are many mitigation techniques well established in the literature to balance the neutral point voltage for 3-level inverter. These techniques employ either Carrier based pulse width modulation (CBPWM), Space vector pulse width modulation (SVPWM) or hybrid of both the PWM techniques. Balancing becomes complicated as the level of the inverter increases due to addition of capacitor junctions. The imbalance in capacitor voltages may cause uneven voltage distribution among switching devices and sometimes may cause failure. It also increases harmonic content in its output waveform. This paper develops new modulation scheme for balancing capacitor voltages for Five-level inverter .The scheme is a hybrid PWM which is a combination of both CBPWM and SVPWM techniques. As per this scheme CBPWM is applied to meet the load demand and at the zero crossings of the reference signal, CBPWM is blocked and for one carrier cycle. During this SVPWM is applied with appropriate switching state selection to neutralize the imbalance in capacitor voltage.
A REVIEW ON EVALUATION OF PV MODELS BASED ON AN INTEGRATION USING A NEW CONFI...ijiert bestjournal
The effect of linear imbalances and nonlinear loads on the voltage balance of the neutral-point- clamped converters is described in this paper. The Neutral-Point-Clamped inverters are used in the multilevel inverters for high power application s. In this paper a three level NPC inverter that couple accommodate with solar photovoltaic (PV) and battery storage in grid connected system. The three level space vector modulation technique (SVPWM) is proposed. The SVPWM correct the ac voltage under unbalance dc voltage condition .SV-PWM strategy makes it possible to control the neutral point voltage by optimum choice of switch sequence for any position and length of output voltage vector. The control scheme has capability to control the power delivery between the solar PV,battery,and grid,it simulta neously provides maximum power point tracking (MPPT) operation for the solar PV. The res ults of matlab modeling of the system detail the comparative operation of inverter topologies wh ich are the conventional two level inverters and multilevel inverter topology to reduce total ha rmonic distortions in grid voltage and electromagnetic interference. Three-level NPC volta ge source inverter that can integrate both renewable energy and battery storage on the dc side of the inverter has been presented. The effectiveness of the proposed methodology is invest igated by the simulation of several scenarios,including battery charging and discharging with dif ferent levels of solar irradiation.
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.
The projected diode assisted Neutral Point Diode Clamed (NPC-MLI) with the photovoltaic system produces a maximum voltage gain that is comparatively higher than those of other boost conversion techniques. This paper mainly explores vector selection approach pulse-width modulation (PWM) strategies for diode-assisted NPC-MLI to obtain a maximum voltage gain without compromising in waveform quality. To obtain a high voltage gain maximum utilization of dc-link voltage and stress on the power switches must be reduced. From the above issues in the diode assisted NPC-MLI leads to vector selection approach PWM technique to perform capacitive charging in parallel and discharging in series to obtain maximum voltage gain. The operation principle and the relationship of voltage gain versus voltage boost duty ratio and switching device voltage stress versus voltage gain are theoretically investigated in detail. Owing to better performance, diode-assisted NPC-MLI is more promising and competitive topology for wide range dc/ac power conversion in a renewable energy application. Furthermore, theoretically investigated are validated via simulation and experimental results.
A Novel Power Factor Correction Rectifier for Enhancing Power QualityIJPEDS-IAES
In this paper, the disturbances in power system due to low quality of power
are discussed and a current injection method to maintain the sinusoidal input
current which will reduce the total current harmonic distortion (THD) as well
as improve the power factor nearer to unity is proposed. The proposed
method makes use of a novel controlled diode rectifier which involves the
use of bidirectional switches across the front-end rectifier and the operation
of the converter is fully analyzed. The main feature of the topology is low
cost, small size, high efficiency and simplicity, and is excellent for
retrofitting front-end rectifier of existing ac drives, UPS etc. A novel strategy
implementing reference compensation current depending on the load
harmonics and a control algorithm for three-phase three-level unity PF
rectifier which draws high quality sinusoidal supply currents and maintains
good dc link- voltage regulation under wide load variation. The proposed
technique can be applied as a retrofit to a variety of existing thyristor
converters which uses three bidirectional switches operating at low frequency
and a half-bridge inverter operating at high frequency .The total power
delivered to the load is processed by the injection network, the proposed
converter offers high efficiency and not only high power factor but also the
Total Harmonic Distortion is reduced. Theoretical analysis is verified by
digital simulation and a hardware proto type module is implemented in order
to confirm the feasibility of the proposed system. This scheme in general is
suitable for the common variable medium-to high-power level DC load
applications.
Filter Based Solar Power Generation System with a Seven Level InverterIJMTST Journal
This paper proposes a new solar power generation system, which is composed of a DC/DC power converter and a new seven-level inverter. The DC/DC power converter integrates a DC-DC boost converter and a transformer to convert the output voltage of the solar cell array into two independent voltage sources with multiple relationships. This new seven-level inverter is configured using a capacitor selection circuit and a full-bridge power converter, connected in cascade. The capacitor selection circuit converts the two output voltage sources of DC-DC power converter into a three-level DC voltage and the full- bridge power converter further converts this three- level DC voltage into a seven-level AC voltage. In this way, the proposed solar power generation system generates a sinusoidal output current that is in phase with the utility voltage and is fed into the utility. The salient features of the proposed seven-level inverter are that only six power electronic switches are used and only one power electronic switch is switched at high frequency at any time. A prototype is developed and tested to verify the performance of this proposed solar power generation system.
Power Quality Improvement Using Cascaded H-Bridge Multilevel Inverter Based D...IJERA Editor
Cascaded multilevel configuration of the inverter has the advantage of its simplicity and modularity over the
configurations of the diode-clamped and flying capacitor multilevel inverters. This paper presents a threephase,
five-level and seven level cascaded multilevel voltage source inverter based active filter for power line
conditioning to improve power quality in the distribution network. The DSTATCOM helps to improve the
power factor and eliminate the Total Harmonics Distortion (THD) drawn from a Non-Liner Diode Rectifier
Load (NLDRL). The compensation process is based on concept of p-q theory. A CHB Inverter is considered for
shunt compensation of a 11 kV distribution system. Finally a level shifted PWM (LSPWM) and phase shifted
PWM (PSPWM) techniques are adopted to investigate the performance of CHB Inverter. The results are
obtained through Matlab/Simulink software package.
Lightning Characteristics and Impulse Voltage.Milton Sarker
Lightning characteristics and standard impulse
waveform are related to each other. But the lack
of realization about the relation between them
would make the solution to produce better
protection against lightning surge becomes
harder. Natural lightning surge waveform has
been compared to standard impulse waveform as
evidence that there have similarity between
them. The standard impulse waveform could be
used to test the strength of electrical equipment
against the lightning. Therefore designing and
simulating the impulse generator are the purpose
of this project beside to get better understanding
about lightning characteristics. This project aims
to develop an impulse generator circuit. The
main objectives of this work are two folds: the
first is the characterization of impulse voltages
and the second is the designing of an impulse
voltage generator. Our working purpose is to
give a concept about Impulse voltages and
impulse generator to the students and
researchers.
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.
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.
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.
Similar to An Approach to Voltage Quality Enhancement by Introduction of CWVM for Distribution System (20)
42 30 nA Comparative Study of Power Semiconductor Devices for Industrial PWM ...IAES-IJPEDS
The growing demand of energy translates into efficiency requirements of
energy conversion systems and electric drives. Both these systems are based
on Pulse Width Modulation (PWM) Inverter. In this paper we firstly present
the state of art of the main types of semiconductors devices for Industrial
PWM Inverter. In particular we examine the last generations of Silicon
Carbide (SiC) MOSFETs and Insulated Gate Bipolar Transistors (IGBTs)
and we present a comparison between these devices, obtained by SPICE
simulations, both for static characteristics at different temperatures and for
dynamic ones at different gate resistance, in order to identify the one which
makes the PWM inverter more efficient.
Modeling and State Feedback Controller Design of Tubular Linear Permanent Mag...IAES-IJPEDS
In this paper a state feedback controller for tubular linear permanent magnet
synchronous motor (TLPMSM) containing two gas springs, is presented.
The proposed TLPMSM controller is used to control reciprocating motions
of TLPMSM. The analytical plant model of TLPMSM is a multi-input
multi-output (MIMO) system which is decoupled to some sub single-input
single-output (SISO) systems, then, the sub SISO systems are converted to
sub-state space models. Indeed, the TLPMSM state space model is decoupled
to some sub-state spaces, and then, the gains of state feedback are calculated
by linear quadratic regulation (LQR) method for each sub-state space
separately. The controller decreases the distortions of the waveforms.
The simulation results indicate the validity of the controller.
Analysis of Harmonics and Ripple Current in Multi-Module Converters with Incr...IAES-IJPEDS
Controlled rectifiers are considered as the most important hardware part in
the field of HVDC systems in transmission lines and can be used for a
number of power electronics based system operation, control and utility
applications. In this paper, a brief design of a 12-pulse, 24-pulse, 36-pulse
and a 48-pulse converter connected to the grid is presented along with the
harmonic and ripple current analysis with its comparison statistics and thus
providing a justification for the suitable ones. The performance of the
12, 24, 36 and 48-pulse converters are compared for their effectiveness in
both quantitatively as well as qualitatively. Further, comparison of the
48-pulse converter on its THD and current ripple which is connected towards
the grid with simple pulse width modulation technique is also proposed. It
combines all features of the low switching concepts and DC current reinjection
techniques. Some basic topological explanation of the controlled
rectifiers and simulation results using MATLAB are also presented in this
paper in order to justify the harmonic analysis. The simulation results along
with the quantitative results shows the effectiveness of the proposed scheme
for the cancelation or the elimination of the harmonics result in maximum
harmonic mitigation, for high power utility applications, the 48-pulse
converter is most fitting to improve the conversion efficiency, low di/dt
and dv/dt and active and reactive power controllability.
Comparative Study of Various Adjustable Speed Drives during Voltage SagIAES-IJPEDS
This Paper compares the sensitivity of various adjustable speed drives to
voltage sag for the process control applications. Three phase voltage sag of
type B caused due to SLG fault is considered and four topologies of ASD’s
are compared in this paper. The comparison is done especially in speed,
voltage, current and torque of the ASDs. Diode rectifier without z source
inverter, diode rectifier with z source inverter, single phase two leg Vienna
rectifier and single phase neutral linked Vienna with z source inverter are
compared and the best one is highlighted. The circuits of various ASD’s are
simulated using Matlab /Simulink.
Modified Distribution Transformer for Enhancing Power Quality in Distribution...IAES-IJPEDS
The percentage of non-linear loads in the power distribution sector is increasing
day by day. Harmonics injected by these non-linear loads circulate in the delta
windings of the conventional distribution transformer thereby increasing the
temperature and losses. This reduces the efficiency and life of the transformers.
In a modified distribution transformer configuration proposed recently, called
star-star-delta_utilized configuration (YYD_utilized), the harmonics circulating
in the delta winding was utilized and the drainage power thus recovered was
used to power auxiliary loads. This paper presents the experimental studies
conducted on YYD_utilized distribution transformer. When compared to
conventional star-star, delta-star and star-star-delta transformers, the new
configuration of YYD_utilized transformer has shown considerable
improvement in transformer efficiency. The results obtained show that when
the power from the circulating harmonics is recovered and utilized, it not only
improves transformer efficiency but also improves the power factor
and reduces the harmonic distortions at the primary side of the transformer.
The results obtained also suggest the existence of maximum power point or an
optimum loading for the recovered harmonic power.
Modelling of Virtual Synchronous Converter for Grid-Inverter Synchronization ...IAES-IJPEDS
In this paper, virtual synchronous converter (VSCon) is been developed
which mimic the behavior of synchronous generator as in order to have fast
synchronization between the inverter with the grid. This synchronization is
important before can sent the power among inverter-grid connection. This
technique can also been applied at the distributed generated sources when are
connected to the local microgrids. Here, the frequency and voltage
synchronization also can be controlled at the same time some improvement
on synchronous generator mathematical model that is suitable to be
implemented into the inverter control. The whole unit of VSCon is operated
and simulated in Matlab/Simulink in order to observe all consequences
during synchronizing the voltage, frequency and phase-angle. It has been
verified by the simulation circuit where, the power converter can be
synchronized with the microrids without using a PLL unit for self
synchronization. This VSCon technique has proven that, by applying the
concept of the synchronous generator model in inverter control, it can cause
the inverter to behave as generator system, which does not required any
phase information from the grid in order to be synchronized.
Enhanced Crowbar Protection for Fault Ride through Capability of Wind Generat...IAES-IJPEDS
Due to increasing demand in power, the integration of renewable sources like
wind generation into power system is gaining much importance nowadays.
The heavy penetration of wind power into the power system leads to many
integration issues mainly due to the intermittent nature of the wind and the
desirability for variable speed operation of the generators. As the wind power
generation depends on the wind speed, its integration into the grid has
noticeable influence on the system stability and becomes an important issue
especially when a fault occurs on the grid. The protective disconnection of a
large amount of wind power during a fault will be an unacceptable
consequence and threatens the power system stability. With the increasing
use of wind turbines employing Doubly Fed Induction Generator (DFIG)
technology, it becomes a necessity to investigate their behavior during grid
faults and support them with fault ride through capability. This paper
presents the modeling and simulation of a doubly fed induction generator
according to grid code compatibility driven by a wind turbine connected to
the grid. This paper analyses the voltage sag due to a three-phase fault in the
wind connected grid. A control strategy including a crowbar circuit has been
developed in MATLAB/SIMULINK to bypass the rotor over currents during
grid fault to enhance the fault ride through capability and to maintain system
stability. Simulation results show the effectiveness of the proposed control
strategies in DFIG based grid connected wind turbine system.
An Improved of Multiple Harmonic Sources Identification in Distribution Syste...IAES-IJPEDS
This paper introduces an improved of multiple harmonic sources
identification that been produced by inverter loads in power system using
time-frequency distribution (TFD) analysis which is spectrogram.
The spectrogram is a very applicable method to represent signals in
time-frequency representation (TFR) and the main advantages
of spectrogram are the accuracy, speed of the algorithm and use low memory
size such that it can be computed rapidly. The identification of multiple
harmonic sources is based on the significant relationship of spectral
impedances which are the fundamental impedance (Z1) and harmonic
impedance (Zh) that extracted from TFR. To verify the accuracy of the
proposed method, MATLAB simulations carried out several unique cases
with different harmonic producing loads on IEEE 4-bus test feeder cases. It is
proven that the proposed method is superior with 100% correct identification
of multiple harmonic sources. It is envisioned that the method is very
accurate, fast and cost efficient to localize harmonic sources in distribution
system.
Performance and Energy Saving Analysis of Grid Connected Photovoltaic in West...IAES-IJPEDS
The paper presents performance and energy saving analysis of 1.25 kWp grid
connected photovoltaic system under difference weather condition in West
Sumatera. The measured data were performed during weather data that often
occur in West Sumatra i.e. sunny, overcast, raining and cloudy.
The synchronizing process successfully done even bad weather conditions
when sunlight was low automatically. Photovoltaic in average start
producing power from 7:00 AM to 6:00 PM for normal or clear sky, however
under overcast, raining and cloudy weather, the PV power decreased and
disconnected earlier before sunset. During intermittent raining, overcast and
cloud covered the PV power output show an irregular profile. The PV energy
saving performed for three residential connection cases: 1300 VA, 900 VA
with subsidized and 900 VA without subsidized. The solar PV installation
have more benefits and energy saving for 1300 VA, 900 VA without
subsidized with payback period around 8.5 years. However, the 900 VA with
subsidized take longer 20.8 years, but still in PV lifespan 25 years. In the
future, household subsidies may be reduced or eliminated, the solar energy
will be viable alternative of energy resources when it can produce electricity
at a cost equivalent to utility grid PLN rate.
An Improved Constant Voltage Based MPPT Technique for PMDC MotorIAES-IJPEDS
Stand-alone photovoltaic (SAPV) systems are being used in remote areas
and are being seen as one of the promising solution in this regard. The SAPV
system as presented in the paper consists of solar PV panel, a DC-DC
converter, a controller and a PMDC motor. The current-voltage and powervoltage
characteristics being nonlinear, the SAPV system require maximum
power point techniques (MPPT) control techniques to extract maximum
power available from the PV cell. A voltage based MPPT technique which is
capable of tracking MPP has been selected because of numerous advantages
it offers such as: simple and low cost of implementation. The limitation of
constant voltage method is that its efficiency is low as the PV panel has to be
disconnected from the load for measurement of the open circuit voltage
(Voc). In the presented paper, the authors have removed this limitation by
using a pilot PV panel for measurement of Voc. A proportional-integrator (PI)
based controller is used in implementation of constant voltage MPP
technique and the modeling is done in MATLAB®/SIMULINK simulation
environment. The simulation results are presented and discussed in the paper,
the results shows that the efficiency of the system has increased.
A Discrete PLL Based Load Frequency Control of FLC-Based PV-Wind Hybrid Power...IAES-IJPEDS
The sun and wind-based generation are considered to besource of green
power generation which can mitigate the power demand issues. As solar and
wind power advancements are entrenched and the infiltration of these
Renewable Energy Sources (RES) into to network is expanding dynamically.
So, as to outline a legitimate control and to harness power from RES the
learning of natural conditions for a specific area is fundamental. Fuzzy Logic
Controller (FLC) based Maximum Power Point Tracking (MPPT) controlled
boost converter are utilized for viable operation and to keep DC voltage
steady at desired level. The control scheme of the inverter is intended to keep
the load voltage and frequency of the AC supply at aconstant level regardless
of progress in natural conditions and burden. A Simulink model of the
proposed Hybrid system with the MPPT controlled Boost converters
and Voltage regulated Inverter for stand-alone application is developed in
MATLAB R2015a, Version 8.5.0. The ongoing information of Wind Speed
and Solar Irradiation levels are recorded at BITS-Pilani, Hyderabad Campus
the performance of the voltage regulated inverter under constant and varying
linearAC load is analyzed. The investigation shows that the magnitude of
load voltage and frequency of the load voltage is maintained at desired level
by the proposed inverter control logic.
An Adaptive Virtual Impedance Based Droop Control Scheme for Parallel Inverte...IAES-IJPEDS
This paper presents an adaptive virtual impedance based droop control
scheme for parallel inverter operation in low voltage microgrid. Because it is
essential to achieve power sharing between inverters in microgrid, various
droop control schemes have been proposed. In practice, the line impedance
between inverters and the point of common coupling (PCC) in microgrid are
not always equal. This imbalance in line impedance often results in a reactive
power mismatch among inverters. This problem has been solved by
introducing a virtual impedance loop in the conventional droop control
scheme. However, the reactive power sharing performance of this method is
still deteriorated when the line impedances change during operation. To
overcome such a problem, a new control scheme that is based on a virtual
impedance loop and an impedance estimation scheme is proposed.
To monitor the changes in line impedances, the impedance estimator is
implemented by using the output voltages and currents of inverters as well as
the voltages at the PCC. To compensate for the reactive power mismatch due
to the line impedance changes, the estimated line impedance is fed to the
virtual impedance loop in which it adjusts the virtual impedance value.
Comparative simulation results with the conventional ones verify the
effectiveness of the proposed adaptive virtual impedance based droop control
scheme.
Open-Switch Fault-Tolerant Control of Power Converters in a Grid-Connected Ph...IAES-IJPEDS
This paper presents the study of an open switch fault tolerant control of a
grid-connected photovoltaic system. The studied system is based on the
classical DC-DC boost converter and a bidirectional 6-pulse DC-AC
converter. The objective is to provide an open-switch fault detection method
and fault-tolerant control for both of boost converter and grid-side converter
(GSC) in a grid-connected photovoltaic system. A fast fault detection method
and a reliable fault-tolerant topology are required to ensure continuity of
service, and achieve a faster corrective maintenance. In this work, the mean
value of the error voltages is used as fault indicator for the GSC, while, for
the boost converter the inductor current form is used as fault indicator. The
fault-tolerant topology was achieved by adding one redundant switch to the
boost converter, and by adding one redundant leg to the GSC. The results of
the fault tolerant control are presented and discussed to validate the proposed
approach under different scenarios and different solar irradiances.
Photovoltaic System with SEPIC Converter Controlled by the Fuzzy LogicIAES-IJPEDS
In this work, a fuzzy logic controller is used to control the output voltage of a
photovoltaic system with a DC-DC converter; type Single Ended Primary
Inductor Converter (SEPIC). The system is designed for 210 W solar
photovoltaic (SCHOTT 210) panel and to feed an average demand of 78 W.
This system includes solar panels, SEPIC converter and fuzzy logic
controller. The SEPIC converter provides a constant DC bus voltage and its
duty cycle controlled by the fuzzy logic controller which is needed to
improve PV panel’s utilization efficiency. A fuzzy logic controller (FLC) is
also used to generate the PWM signal for the SEPIC converter.
Electric Power Converter with a Wide Input Voltage RangeIAES-IJPEDS
The electric power converter for downhole telemetry systems of oil-well
pumps include a downhole block connected to the pump that contains
electronic circuits required for the operation of the motor pump sensors
and transmission of data about their condition to the surface are described.
A few methods of electric power conversion for this purpose are considered.
The circuit contained two steps of voltage converting are proposed.
The electrical scheme of this method is considered in the article. Proposed
decisions are simulated and verified experimentally. The input high supply
voltage range (200-4200 V) without loss of efficiency (even temporary) was
obtained. The results of simulation and experimental studies have shown
very close results.
Design and Implementation of Real Time Charging Optimization for Hybrid Elect...IAES-IJPEDS
Electric vehicle (EV) has gained incredible interest from the past two decade
as one of the hopeful greenhouse gasses solution. The number of Electric
Vehicle (EV) is increasing around the world; hence that making EVs user
friendly becomes more important. The main challenge in usage of EV is the
charging time required for the batteries used in EV. As a consequence, this
subject matter has been researched in many credentials where a wide range
of solutions have been proposed. However those solutions are in nature due
to the complex hardware structure. To provide an unswerving journey
an Android application based charging optimization is proposed.
This application is aimed at giving relevant information about the EV’s
battery state of charge (SOC), accurate location of the EV, booking of the
charging slots using token system and route planner. At emergency
situations, an alternative service is provided by mobile charging stations.
Route planner indicates the temperature by which prediction of reaching the
destination can be done. In addition to that nearest places such as parks,
motels are indicated. The estimated time and distance between the electric
vehicle and the charging station is calculated by the charging station server
according to which the parking lot is allocated. Vehicle to charging station
communication is established for the time estimation of charging. This will
help the EV users to know about charge status and charging station, which
support fast charging method and availability of the station on the go
and also when to charge their EV. The Arduino UNO board has been used
for the hardware part. The hardware results are confirming the conceptual of
the proposed work.
Performance Analysis of Photovoltaic Induction Motor Drive for Agriculture Pu...IAES-IJPEDS
This paper presents water pumping system using renewable source (solar)
without the use of chemical storage batteries. In this converter-inverter
circuit is used to drive Induction motor. The Converter used here is Two
Inductor boost converter (TIBC), which consists of a resonant tank, voltage
doubler rectifier and a snubber circuit. TIBC is designed to drive the three
phase induction motor from PV energy. TIBC converter is also known as
current fed multi resonant converter having high voltage gain and low input
current ripple. Converter switches are controlled through hysteresis controller
and ZCS resonant topologies. Solar PV power fluctuates according to
irradiation level of sunlight and hence tracking of maximum power at all
time is mandatory. SPWM control with third harmonic injection is used to
trigger the IGBT’s in the inverter. The development is oriented to achieve a
more efficient, reliable, maintenance free and cheaper solution than the
standard ones, that uses DC motors or low voltage synchronous motors.
The proposed method is verified with MATLAB/SIMULINK and the system
simulation confirms the performance of the proposed system.
Comparison of Sine and Space Vector Modulated Embedded Z-Source Inverter fed ...IAES-IJPEDS
This paper deals with performance of photovoltaic powered Embedded
Z-Source Inverter (EZSI) fed Induction motor drive. The DC output from the
PV-Panel is boosted and converted into AC using Embedded Z-Source
Inverter. EZSI system based on the concept of Z-Source Inverter (ZSI),
which provides single stage power conversion. The EZSI also produce same
voltage gain as that of the ZSI based system. In EZSI the DC source is
embedded within the X-shaped LC impedance network, due to this EZSI has
the added advantage of inherent source filtering capability, this can be
achieved without any extra passive filter. EZSI can produce the AC output
voltage which is greater than the DC link voltage. EZSI system also provides
ride-through capability under voltage sags. In this paper the performance of
space vector modulated EZSI fed Induction Motor Drive is compared with
sinusoidal PWM controlled EZSI fed Drive system. The PV powered EZSI
fed three phase Induction Motor System is designed, modeled and simulated
using MAT LAB-SIMULINK and the corresponding results are presented.
This drive system has advantages like voltage boosting ability and reduced
harmonic content.
Single-Phase Multilevel Inverter with Simpler Basic Unit Cells for Photovolta...IAES-IJPEDS
This paper presents a single-phase multilevel inverter (MLI) with simpler
basic unit cells. The proposed MLI is able to operate in two modes, i.e.
charge mode to charge the batteries, and inverter mode to supply AC power
to load, and therefore, it is inherently suitable for photovoltaic (PV) power
generation applications. The proposed MLI requires lower number of power
MOSFETs and gate driver units, which will translate into higher cost saving
and better system reliability. The power MOSFETs in the basic unit cells
and H-bridge module are switched at near fundamental frequency, i.e. 100
Hz and 50 Hz, respectively, resulting in lower switching losses. For low total
harmonic distortion (THD) operation, a deep scanning method is employed
to calculate the switching angles of the MLI. The lowest THD obtained is
8.91% at modulation index of 0.82. The performance of the proposed MLI
(9-level) has been simulated and evaluated experimentally. The simulation
and experimental results are in good agreement and this confirms that the
proposed MLI is able to produce an AC output voltage with low THD.
A DC Inrush Current Minimisation Method using Modified Z-Source Inverter in A...IAES-IJPEDS
The adjustable speed drives employ PWM converter-inverter system in order
to obtain unity power factor. The DC inrush current in DC link capacitors of
the rectifier limits the operation of power devices. Hence, this paper proposes
a new approach to reduce the DC inrush current by employing modified
Z-source inverter in a Adjustable Speed Drive system. The operating
principles, design procedure and simulation results are shown and compared
with the conventional Z-Source inverter.
Vaccine management system project report documentation..pdfKamal Acharya
The Division of Vaccine and Immunization is facing increasing difficulty monitoring vaccines and other commodities distribution once they have been distributed from the national stores. With the introduction of new vaccines, more challenges have been anticipated with this additions posing serious threat to the already over strained vaccine supply chain system in Kenya.
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Automobile Management System Project Report.pdfKamal Acharya
The proposed project is developed to manage the automobile in the automobile dealer company. The main module in this project is login, automobile management, customer management, sales, complaints and reports. The first module is the login. The automobile showroom owner should login to the project for usage. The username and password are verified and if it is correct, next form opens. If the username and password are not correct, it shows the error message.
When a customer search for a automobile, if the automobile is available, they will be taken to a page that shows the details of the automobile including automobile name, automobile ID, quantity, price etc. “Automobile Management System” is useful for maintaining automobiles, customers effectively and hence helps for establishing good relation between customer and automobile organization. It contains various customized modules for effectively maintaining automobiles and stock information accurately and safely.
When the automobile is sold to the customer, stock will be reduced automatically. When a new purchase is made, stock will be increased automatically. While selecting automobiles for sale, the proposed software will automatically check for total number of available stock of that particular item, if the total stock of that particular item is less than 5, software will notify the user to purchase the particular item.
Also when the user tries to sale items which are not in stock, the system will prompt the user that the stock is not enough. Customers of this system can search for a automobile; can purchase a automobile easily by selecting fast. On the other hand the stock of automobiles can be maintained perfectly by the automobile shop manager overcoming the drawbacks of existing system.
Forklift Classes Overview by Intella PartsIntella Parts
Discover the different forklift classes and their specific applications. Learn how to choose the right forklift for your needs to ensure safety, efficiency, and compliance in your operations.
For more technical information, visit our website https://intellaparts.com
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
Democratizing Fuzzing at Scale by Abhishek Aryaabh.arya
Presented at NUS: Fuzzing and Software Security Summer School 2024
This keynote talks about the democratization of fuzzing at scale, highlighting the collaboration between open source communities, academia, and industry to advance the field of fuzzing. It delves into the history of fuzzing, the development of scalable fuzzing platforms, and the empowerment of community-driven research. The talk will further discuss recent advancements leveraging AI/ML and offer insights into the future evolution of the fuzzing landscape.
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least absolute value and the Teaser energy operator along with the Hilbert transform [12] have been
employed to separate between the fundamental voltage and the flicker disturbance for the sake of flicker
mitigation. Also, the adaptive perception-based compensating strategy is developed to compensate for
voltage sags, swells and harmonics. The Kalman filter has been used to track the envelope of voltage sags
and flicker but the proposed extraction technique is very complicated to be practically implemented [13-17].
Therefore this paper introduces an efficient and simple compensation strategy for several VQ
problems. The proposed method for each phase system is applied to a series mitigation device which is a
single phase Cockcroft Walton Voltage Multiplier Circuit (CWVM). Some measurements are also presented
to validate the estimation procedure. It has been shown that the voltage performance of the distribution
system with respect to a critical load could be significantly improved. A technique for enhancing the voltage
performance in the distribution systems has been described.
2. PROPOSED CIRCUIT MODEL
This section explicates how the Cockcroft Walton Voltage Multiplier Circuit is formulated in a
recursive manner to extract and mitigate the VQ disturbances in distribution systems. This section has two
levels; the level I shown in Figure 1 demonstrates the stage by stage circuit connections to track and extract
the voltage disturbances. The level II shown in the Figure 2 explain the structure of the proposed scheme,
and explains how it works to mitigate the voltage flickers.
Figure 1. Block diagram for Steady Power Supply System
The CWVM shown in the Figure 2 has a low capacitance coil with a specific end goal to improve
better results. The series CWVM operates in two modes. The first mode is charging mode and the second one
is the discharging mode. When the circuit is charged, one pair of diodes (e.g. D1 and D4 or D2 and D3) is on,
so the DC current drives in series with source and Cockcroft Walton Voltage Multiplier Circuit. For the
protection of diodes a current limiter circuit R, is connected in series with the source voltage and pair of
diodes. It should be noted that the zener diode is connected across the bridge to maintain the steady state
voltage and polarised capacitor is connected for smooth operation. After several cycles the, two transistors
Q1 and Q2 are coupled in anti parallel to produce pulsating DC i.e.; DC to AC conversion as the output is
connected with the centre tap transformer. At this stage the two diodes D11 and D22 are linked in opposite
direction for the protection of transistors Q1 and Q2.
3. COCKROFT WALTON VOLATGE MULTIPLIER CIRCUIT
Another parameter which plays a vital role in the voltage enhancement is the Cockcroft Walton
Voltage Multiplier. When the centre tap transformer is energised one terminal becomes positive with respect
to other terminal at the output side, therefore the potential of the c1, c2 and c3 junction point falls. Also the
potential of c2 and c4 junction points reduces, hence c2 is charged through adjacent diode. In the next half
cycle the potential at junction point of c3 and c5 becomes more positive than potential at c2 and c4, thus c3 is
charging through next adjacent diode. Finally all the capacitors shown in the Figure 2 i.e; c4 to c24 are
charged. The voltage across the column of capacitors consisting of c3 to c23, keeps on oscillating as the supply
voltage alternates. However, the voltage across the capacitances c2 to c24 remains constant. Thus, the use of
multistage arranged in the manner shown in the Figure 2 enables very high voltage to be obtained. The equal
stress of the elements (both capacitors and diodes) used is very helpful and promotes a modular design of
such voltage multiplier circuit.
4. MATHEMATICAL MODELLING
As shown in the Figure 2 initially current is passed through rectifier circuit. Therefore, the operation
of circuit shown in the Figure 2 can be divided into two operation modes; charging and discharging modes.
Supply RectifierR Filter
DC to AC
Convertion
Cockroft Walton
Volatge
Multiplier
L
O
A
D
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At first diode D1 and D4 in the on state. Then, the loop is formed and the input voltage can be obtained, as
follows. Nomenclature as shown in Table 1.
( ) (1)
(2)
Using (1) and (2), the following equation can be written
( ) (3)
Similarly the output voltage can be written in the following form
(4)
4.1. Desired Value of PR
Since the calculation of Pr from the quadratic equation is time consuming, by equation (1) can be
expressed by the following equation.
( )
(5)
4.2. Preferred Value of NCWVM
(6)
Figure 2. Circuit diagram for steady power supply
NOMENCLATURE:
Table 1. Nomenclature
Sl No. Details
1. Vinmin: Minimum input volt for proper output
2. Vinmax: Maximum allowed input volt for proper output.
3. Vzbr: Zener breakdown volt.
4. Vinput: Range of input voltage.
5. Voutput: Output voltage.
6. NCWVM : Multiplying factor or No. of capacitor in CWVM
7. Pr: Power rating of series resistance of rectifier circuit.
8. R1 : Series resistance of the rectifier circuit
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5. SIMULATION RESULTS
The simulation results are carried out in a PSPICE environment. The simulation parameters are
given in Table 2. The circuit shown in the Figure 2 is tested for different input voltage. Figure 3, Figure 4,
and Figure 5 show the output voltage is purely sinusoidal, also the magnitude of the voltage is constant for
the different input voltage. Figure 6 illustrates the relationship between the output voltage, input voltage
and zener voltage, such that input is varying from 0 to 200V but the output is almost constant. The system
outputs are listed in Table 3.
Table 2 Simulation parameters
Parameter Description Value
C11, C22 Tantalum Capacitor 68 uf, 25 V
R11, R22 Resistor 10 Ohm, 5 Watt
R33, R44 Resistor 180 Ohm, 1 Watt
D11, D22 Silicon Diode HEP 154
Q1, Q2 NPN Transistor 2N3055
T1 Center Tapped Transformer 20 V
Figure 3. Voltage Magnitude of CWVM
Figure 4. Voltage Magnitude of CWVM
Output
Voltage
Input
Voltage
Zener
Voltage
CWVM
Input
Voltage
Output
Voltage
Input
Voltage Zener
Voltage
CWVM
Input
Voltage
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Figure 5. Voltage Magnitude of CWVM
Figure 6. Voltage Magnitude of CWVM
Table 3. Simulation output of CWVM
Description
Value
Figure 3 Figure 4 Figure 5
Output Voltage 2400V (AC) 2400V (AC) 2400V (AC)
Input Voltage 50V (AC) 200V (AC) 320V (AC)
Volt. across zener diode 10V (DC) 10V (DC) 10V (DC)
Input volt across CWVM 100V (AC) 100V (AC) 100V (AC)
6. CONCLUSION
In this paper, a novel methodology CWVM based on a single-phase Diode Bridge for the mitigation
of voltage flicker has been proposed. The proposed system model has a simple topology, does not need any
controlling circuit and uses fewer diodes. In addition, it leads to lower ripple and voltage drop and lower
voltage distortion. The simulation results show the effectiveness of the proposed system model. And it should
be noted that the Authors have focused on the primary winding of the CWVM. The secondry side is open
circuit. Moreover, the suggested structure of the compensation strategy is being able to accommodate more
modules for mitigating more VQ problems because each module is working independently of the other
modules.
Input
Voltage Zener
Voltage
CWVM
Input
Voltage
Output
Voltage
CWVM
Output
Voltage
Zener
Voltage
Input
Voltage
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REFERENCES
[1] Po-Chen Chen, Vuk Malbasa, Yimai Dong, Mladen Kezunovic, “Sensitivity Analysis of Voltage Sag Based Fault
Location with Distributed Generation”, IEEE Transactions on Smart Grid, 2015, VOL. 6, NO. 4, pp. 2098-2106.
[2] Chen, P.C., Salcedo, R., Zhu, Q., et al., „Analysis of voltage profile problems due to the penetration of distributed
generation in low-voltage secondary distribution networks‟, IEEE Trans. Power del., 2012, 27, (4), pp. 2020 –2028.
[3] Park, C.H., Hong, J.H., Jang, G., „Assessment of system voltage sag performance based on the concept of area of
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[4] Rajesh Damaraju, S.V.N.L. Lalitha. “A Fuzzy Controller for Compensation of Voltage SAG/SWELL Problems
Using Reduced Rating Dynamic Voltage Restorer”, TELKOMNIKA Indonesian Journal of Electrical Engineering,
Vol. 15, No. 3, September 2015, pp. 407 ~ 414
[5] Z.A. Jaffery, Sunil Kumar Chaudhry, “Quality Assessment of a Single-phase resonant inverter” International
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[7] Alok Kumar Shrivastav, Pradip Kumar Sadhu, Ankur Ganguly, Nitai Pal, “A Novel Transient Fault Current limiter
based on three phase Thyristor Bridge for Y-yg transformer” International Journal of Power Electronics and
Drives System, Vol. 6(4), December 2015, PP.747 – 758.
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[12] Alok Kumar Shrivastav, Pradip Kumar Sadhu, Ankur Ganguly, “Comparative Stability and Harmonic Analysis
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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, Techno India Batanagar,
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, and
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, Techno
India Batanagar, 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, electrical machines, power quality in distribution system,
power folw monitoring and stability analysis.
Saumen Dhara received his B.E Degree in Electrical Engineering from Burdwan University,
West Bengal, India in 2002 and M.E in 2007 from Jadavpur University, West Bengal, India. He
has total thirteen years of experience in the field of teaching. Presently he is working as a
Assistant Professor in the Department of Electrical Engineering, Saroj Mohan Institute of
Technology, Guptipara, Hooghly-712512, West Bengal, India. He is presently pursuing Ph.D.
programme at the Department of Electrical Engineering, Indian School of Mines, Dhanbad-
826004, India. His research area of interests includes Power system, Power electronics,
Investigation and analysis of faults in power system for power quality improvement.