This paper presents a five level Neutral Point Clamped (NPC) inverter fed
IM (Induction Motor) drive for variable speed application. In general the
stator current is very highly affected by the harmonic components. It can be
affecting the torque to produce high torque ripple in IM at maximum to low
speed region. Since the drive performances are depends on mathematical
model contains the parameters variations, noise, common mode voltage, flux
variation and harmonic levels of the machine. Torque ripples and voltage
saturations are the most significant problems in drive application. To
overcome this problem the DTFC (direct torque and flux control) technique
based five-level neutral-point-clamped (NPC-5L) approach is used. The
proposed control scheme uses to stator current error as variable. Through the
resistance estimated PI controller rules based the selection of voltage space
vector modulation technique is optimized and motor performance level has
been improved. The torque & speed are successfully controlled with less
torque response. The results are compared and verified with conventional
three phases VSI under different control technique by Matlab/Simulink.
Novel Discrete Components Based Speed Controller for Induction MotorIJPEDS-IAES
This paper presents an electronic design based on general purpose discrete
components for speed control of a single phase induction motor drive. The
MOSFETs inverter switching is controlled using Sampled Sinusoidal Pulse
Width Modulation (SPWM) techniques with V/F method based on Voltage
Controlled Oscillator (VCO). The load power is also controlled by a novel
design to produce a suitable SPWM pulse. The proposed electronic system
has ability to control the output frequency with flexible setting of lower limit
to less than 1 Hz and to higher frequency limits to 55 Hz. Moreover, the
proposed controller able to control the value of load voltage to frequency
ratio, which plays a major parameter in the function of IM speed control.
Furthermore, the designed system is characterized by easy manufacturing
and maintenance, high speed response, low cost, and does not need to
program steps as compared to other systems based on Microcontroller
and digital signal processor (DSP) units. The complete proposed electronic
design is made by the software of NI Multisim version 11.0 and all the
internal sub-designs are shown in this paper. Simulation results show the
effectiveness of electronic design for a promising of a high performance IM
PWM drive.
The pulse generator which has been implemented in the pulse electric field (PEF) treatment system for food processing is worth to be highlighted and improved. It is parallel with the advancement in semiconductor technology, which offers robust and accurate devices. This research is an effort to produce a low cost, compact and reliable pulse generator as well as equipped with a pulse width modulation (PWM) method for wide selection of frequency and duty cycle. The result shows that the simulation process has proven the theoretical concept to be right and yields the desired outcome based on the designed values. Then, the actual printed circuit board (PCB) has been fabricated to obtain practical results which intended to be compared with the simulation outcomes. Concerning the frequency and its duty cycle, both parameters can be altered without affecting each other. It means by changing the frequency, duty cycle remains the same and vice versa. Thus, this proposed pulse generator achieves its objective and fits to be implemented in PEF treatment technology. It also can replace the conventional pulse forming network (PFN) which is bulky and costly.
This paper proposes a new voltage frequency converter (VFC) that converts both voltage and frequency to the required level of voltage and frequency in low voltage networks used in various countries. The proposed converter could be used as a universal power supply for sensitive AC loads. The converter is composed of, input voltage and frequency detection circuitry, full bridge boost rectifier and a DC to AC inverter. In addition, to improve the feasibility and performance of the converter, synchronous reference based PI (SRFPI) controller is adopted, where the system behaves similar to a DC-DC converter. The parameter selection of PI controller is done using a recent optimisation technique called Lightning Search Algorithm (LSA). The simulation of VFC is conducted in MATLAB/Simulink environment. The simulation results shows that LSA based PI controller provides better output voltage regulation with respect to the reference value under various load and input conditions.
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.
Novel Discrete Components Based Speed Controller for Induction MotorIJPEDS-IAES
This paper presents an electronic design based on general purpose discrete
components for speed control of a single phase induction motor drive. The
MOSFETs inverter switching is controlled using Sampled Sinusoidal Pulse
Width Modulation (SPWM) techniques with V/F method based on Voltage
Controlled Oscillator (VCO). The load power is also controlled by a novel
design to produce a suitable SPWM pulse. The proposed electronic system
has ability to control the output frequency with flexible setting of lower limit
to less than 1 Hz and to higher frequency limits to 55 Hz. Moreover, the
proposed controller able to control the value of load voltage to frequency
ratio, which plays a major parameter in the function of IM speed control.
Furthermore, the designed system is characterized by easy manufacturing
and maintenance, high speed response, low cost, and does not need to
program steps as compared to other systems based on Microcontroller
and digital signal processor (DSP) units. The complete proposed electronic
design is made by the software of NI Multisim version 11.0 and all the
internal sub-designs are shown in this paper. Simulation results show the
effectiveness of electronic design for a promising of a high performance IM
PWM drive.
The pulse generator which has been implemented in the pulse electric field (PEF) treatment system for food processing is worth to be highlighted and improved. It is parallel with the advancement in semiconductor technology, which offers robust and accurate devices. This research is an effort to produce a low cost, compact and reliable pulse generator as well as equipped with a pulse width modulation (PWM) method for wide selection of frequency and duty cycle. The result shows that the simulation process has proven the theoretical concept to be right and yields the desired outcome based on the designed values. Then, the actual printed circuit board (PCB) has been fabricated to obtain practical results which intended to be compared with the simulation outcomes. Concerning the frequency and its duty cycle, both parameters can be altered without affecting each other. It means by changing the frequency, duty cycle remains the same and vice versa. Thus, this proposed pulse generator achieves its objective and fits to be implemented in PEF treatment technology. It also can replace the conventional pulse forming network (PFN) which is bulky and costly.
This paper proposes a new voltage frequency converter (VFC) that converts both voltage and frequency to the required level of voltage and frequency in low voltage networks used in various countries. The proposed converter could be used as a universal power supply for sensitive AC loads. The converter is composed of, input voltage and frequency detection circuitry, full bridge boost rectifier and a DC to AC inverter. In addition, to improve the feasibility and performance of the converter, synchronous reference based PI (SRFPI) controller is adopted, where the system behaves similar to a DC-DC converter. The parameter selection of PI controller is done using a recent optimisation technique called Lightning Search Algorithm (LSA). The simulation of VFC is conducted in MATLAB/Simulink environment. The simulation results shows that LSA based PI controller provides better output voltage regulation with respect to the reference value under various load and input conditions.
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.
A unity power factor bridgeless isolated cuk converter fed brushless dc motor...LeMeniz Infotech
A unity power factor bridgeless isolated cuk converter fed brushless dc motor drive
To Get this projects Call : 9566355386 / 99625 88976
Visit : www.lemenizinfotech.com / www.ieeemaster.com
Mail : projects@lemenizinfotech.com
Comparison Analysis of Zeta PFC Converter to Improve Power Quality Improvemen...IOSRJEEE
This project “comparison analysis of ZETA PFC converter to improve power quality improvement by PI Controller, Hysteresis controller and Fuzzy logic controller for speed control of a Induction Motor”is composed of anisolated ZETA converter is proposed as a power factor correction (PFC) converter with DC link voltage control for speed control of a Induction Motor (IM).Induction motor has got the volatility of wide range of speed control.Power electronic converters canenvisage dynamic speed control. The front end rectifier and dc to dc converter can be monitored to facilitate requisiteinput voltage to the inverter fed drive working at constant speed. A single phase supply followed by an uncontrolledbridge rectifier and a Zeta DC-DC converter is used to control the voltage of a DC link capacitor which is lying between the Zeta converter and a Voltage Source Inverter (VSI). Speed control is achieved by maintaining constant dclink voltage. In this drive, speed is controlled by adjusting the DC link voltage of the VSI feeding induction motor.VSI operates in a low frequency switching mode for reduced switching losses. The voltage source inverter (VSI) is used as a stator supply of Induction Motor. The proposed converter performs the PFC action and DC link voltage control in single stage using only one controller. The current multiplier approach with average current control is used for operation of the isolated ZETA converter in continuous conduction mode (CCM). A rate limiter in the reference DC link voltage is designed for the control of current and torque in Induction Motor. The designed PFC converter results in an improved power quality at AC mains in a wide range of speed control and input AC voltage.
Vlsi implementation of a programmable low drop out voltage regulatoreSAT Journals
Abstract LDO voltage regulators compose a small subset of the power supply arena. Low-drop-out (LDO) voltage regulators are used in analog applications that generally require low noise and high accuracy power rails. Voltage regulators provide a constant voltage supply rail under certain loading conditions. Circuits that are not performing tasks are temporarily turned off lowering the overall power consumption. The LDO voltage regulator, therefore, must respond quickly to system demands and power up connected circuits. To motivate new aspect of power management towards a design of a low drop-out voltage regulator that fulfils the present industry requirements as well as the upcoming demands of the future, it becomes necessary to design the LDO regulator which gives overall performance. A low-voltage low-dropout regulator that uses an Vdd of 1 V to an output of 0.8–0.74 V, with 32-nm CMOS technology is proposed. By scaling down the technology, we can get lower power consumption. More emphasis is given on the compactness and low drop-out voltage. The latest power management unit concept inside the system on chip (Soc) scheme inspires the digital control potential for the design of a novel LDO regulator. A simple operational transconductance amplifier is used as the error amplifier (EA), with a current splitting technique which is able to boost the gain. In the rail-to-rail output stage of the EA, a power noise cancellation mechanism is adopted. Programmability is added by applying two external control signals. These advantages allow the proposed LDO regulator to achieve a 60-mV output variation for low load transient, area efficient architecture with low power consumption. Keywords: low drop-out,32nm,low power consumption, programmability
Review of Integrated Power Factor Correction (PFC) Boost converter topologies...IJARBEST JOURNAL
This paper provides a review of various Power Factor Correction (PFC) boost
converter topologies suitable for telecoms. A novel integrated PFC topology is proposed which acts
as a backup power supply for telecommunication systems. The advantage of the proposed circuit is
that it operates based on soft switching principle thereby reducing the switching losses in the
converter. The topologies analyzed in this paper are conventional average current mode control
boost PFC, bridgeless boost PFC, semi-bridgeless boost PFC, totem-pole bridgeless boost PFC and
proposed integrated boost PFC. All these topology studies are investigated by carrying out the
simulation of the converter circuits using PSIM software. A detailed comparison of all the
topologies have been done and they are compared in terms of supply power factor, supply current
THD and displacement factor. From the results, it is inferred that the proposed integrated PFC
provides a reduced supply current THD and improved power factor. The results are validated.
In this paper, several methods are developed to control the brushless DC (BLDC) motor speed. Since it is difficult to get a good showing by utilizing classical PID controller, the Dynamic Wavelet Neural Network (DWNN) is the proposed work in this paper, with parallel PID controller to obtain an novel controller named DWNN-PID controller. It collects the artificial neural ability of its networks for imparting from motor of BLDC with drive system and the ability of identification for the wavelet decomposition and control of the dynamic system furthermore to have ability for adapting and self-learning. The suggested controller method is utilizing to control the speed of BLDC motor of which supply a better showing than utilizing classical controllers with a wide range of control. The proposed controller parameters are matched continuously using Particle Swarm Optimization (PSO) algorithm. The simulation results based on proposed DWNN-PID controller demonstrate a superior in the stability and performance compared at utilizing classical WNN-PID and conventional PID controllers. The simulation results are accomplished using Matlab/Simulink. It shows that the proposed control scheme has a superior performance.
Analysis and design of single switch forward-flyback two-channel led driver w...LeMeniz Infotech
Analysis and design of single switch forward-flyback two-channel led driver with resonant-blocking capacitor
To Get this projects Call : 9566355386 / 99625 88976
Visit : www.lemenizinfotech.com / www.ieeemaster.com
Mail : projects@lemenizinfotech.com
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.
DTC Scheme for a Four-Switch Inverter-Fed PMBLDC Motor Emulating the Six-Swit...IJRST Journal
The paper deals with the direct torque control (DTC) of brushless DC (BLDC) motor drives fed by four-switch three phase inverters (FSTPI) rather than six-switch inverters (SSTPI) in conventional drives. For any three phase inverter require six switches, but these switches are reduced to four. This reduction of power switches from six to four improves the reliability of the inverter, size of the inverter is reduced and cost of the inverter is also reduces. The FSTPI could be regarded as a reconfigured topology of the SSTPI in case of a switch/leg failure which represents a crucial reliability benefit for many applications especially in electric and hybrid propulsion systems. The DTC of FSTPI-fed BLDC motor drives is treated considering two strategies, such as: 1) DTC-1: a strategy inspired from the one intended to SSTPI-fed BLDC motor drives; 2) DTC-2: a strategy that considers a dedicated vector selection subtable in order to independently control the torques developed by the phases connected to the FSTPI legs during their simultaneous conduction. The operational principle of the four-switch BLDC motor drive and the developed control scheme are theoretically analyzed and the performance is demonstrated by simulation.
Now day’s the power factor has become a major problem in power system to improve the power quality of the grid, as power factor is affected on the grid due to the nonlinear loads connected to it. Single phase bridgeless AC/DC power factor correction (PFC) topology to improve the power factor as well as the total harmonic distortion (THD) of the utility grid is proposed. By removing the input bridge in conventional PFC converters, the control circuit is simplified; the total harmonics distortion (THD) and power factor (PF) are improved. The PI controller operates in two loops one is the outer control loop which calculates the reference current through LC filter and signal processing. Inner current loop generates PWM switching signals through the PI controller. The output of the proposed PFC topology is verified for prototype using MATLAB circuit simulations. The experimental system is developed, and the simulation results are obtained.
The speed of a DC motor can be controlled by varying the voltage applied to the terminal. It can be done by controlling a PWM-VSC (PWM-Voltage Source Converter). This paper analyzes an control strategy of PWM-VSC using fuzzy logic to obtain varying DC voltage and according to the DC motor speed as desired. The control strategy of PWM-VSC directly using the switch variable in dq rotating reference frame as input variables. The fuzzy logic controller proposes to get a DC voltage variation stable by adjusting amplitudo of the network current. The simulation Fuzzy Logic Controller results show that the design fuzzy logic produce a good dynamic of DC voltage and DC motor speed without overshoot. On the network, Total Harmonic Distortion less than 5 % and unity power factor.
Direct Torque Control (DTC) is widely applied for ac motor drives as it offers high performance torque control with a simple control strategy. However, conventional DTC poses some disadvantages especially in term of variable switching frequency and large torque ripple due to the utilization of torque hysteresis controller. Other than that, performance of conventional DTC fed by two-level inverter is also restricted by the limited numbers of voltage vectors which lead to inappropriate selection of voltage vectors for different speed operations. This research aims to propose a Constant Switching Frequency (CSF) torque controller for DTC of induction motor (IM) fed by three-level Neutral-Point Clamped (NPC) inverter. The proposed torque controller utilizes PI controller which apply different gain for different speed operation. Besides, the utilization of NPC inverter provides greater number of voltage vectors which allow appropriate selection of voltage vectors for different operating condition. Using the proposed method, the improvement of DTC drives in term of producing a constant switching operation and minimizing torque ripple are achieved and validated via experimental results.
IMPLEMENTATION OF DISCONTINUOUS INDUCTOR CURRENT MODE IN CUK CONVERTERS FED B...Journal For Research
This paper presents a bridgeless Cuk converter-fed brushless DC (BLDC) motor drive. A Bridgeless Cuk converter is constructed to operate at discontinuous inductor current mode to improve the quality of power and power factor at the AC mains for better speed control. The bridgeless converter is designed for obtaining the low conduction losses and requirement of low size of heat sink for the switches. TI-TMS320-F2812-based Digital Signal Processor (DSP) is used for the development of the hardware prototype of proposed BLDC motor drive.
A three level quasi-two-stage single-phase pfc converter with flexible output...LeMeniz Infotech
A three level quasi-two-stage single-phase pfc converter with flexible output voltage and improved conversion efficiency
To Get this projects Call : 9566355386 / 99625 88976
Visit : www.lemenizinfotech.com / www.ieeemaster.com
Mail : projects@lemenizinfotech.com
A unity power factor bridgeless isolated cuk converter fed brushless dc motor...LeMeniz Infotech
A unity power factor bridgeless isolated cuk converter fed brushless dc motor drive
To Get this projects Call : 9566355386 / 99625 88976
Visit : www.lemenizinfotech.com / www.ieeemaster.com
Mail : projects@lemenizinfotech.com
Comparison Analysis of Zeta PFC Converter to Improve Power Quality Improvemen...IOSRJEEE
This project “comparison analysis of ZETA PFC converter to improve power quality improvement by PI Controller, Hysteresis controller and Fuzzy logic controller for speed control of a Induction Motor”is composed of anisolated ZETA converter is proposed as a power factor correction (PFC) converter with DC link voltage control for speed control of a Induction Motor (IM).Induction motor has got the volatility of wide range of speed control.Power electronic converters canenvisage dynamic speed control. The front end rectifier and dc to dc converter can be monitored to facilitate requisiteinput voltage to the inverter fed drive working at constant speed. A single phase supply followed by an uncontrolledbridge rectifier and a Zeta DC-DC converter is used to control the voltage of a DC link capacitor which is lying between the Zeta converter and a Voltage Source Inverter (VSI). Speed control is achieved by maintaining constant dclink voltage. In this drive, speed is controlled by adjusting the DC link voltage of the VSI feeding induction motor.VSI operates in a low frequency switching mode for reduced switching losses. The voltage source inverter (VSI) is used as a stator supply of Induction Motor. The proposed converter performs the PFC action and DC link voltage control in single stage using only one controller. The current multiplier approach with average current control is used for operation of the isolated ZETA converter in continuous conduction mode (CCM). A rate limiter in the reference DC link voltage is designed for the control of current and torque in Induction Motor. The designed PFC converter results in an improved power quality at AC mains in a wide range of speed control and input AC voltage.
Vlsi implementation of a programmable low drop out voltage regulatoreSAT Journals
Abstract LDO voltage regulators compose a small subset of the power supply arena. Low-drop-out (LDO) voltage regulators are used in analog applications that generally require low noise and high accuracy power rails. Voltage regulators provide a constant voltage supply rail under certain loading conditions. Circuits that are not performing tasks are temporarily turned off lowering the overall power consumption. The LDO voltage regulator, therefore, must respond quickly to system demands and power up connected circuits. To motivate new aspect of power management towards a design of a low drop-out voltage regulator that fulfils the present industry requirements as well as the upcoming demands of the future, it becomes necessary to design the LDO regulator which gives overall performance. A low-voltage low-dropout regulator that uses an Vdd of 1 V to an output of 0.8–0.74 V, with 32-nm CMOS technology is proposed. By scaling down the technology, we can get lower power consumption. More emphasis is given on the compactness and low drop-out voltage. The latest power management unit concept inside the system on chip (Soc) scheme inspires the digital control potential for the design of a novel LDO regulator. A simple operational transconductance amplifier is used as the error amplifier (EA), with a current splitting technique which is able to boost the gain. In the rail-to-rail output stage of the EA, a power noise cancellation mechanism is adopted. Programmability is added by applying two external control signals. These advantages allow the proposed LDO regulator to achieve a 60-mV output variation for low load transient, area efficient architecture with low power consumption. Keywords: low drop-out,32nm,low power consumption, programmability
Review of Integrated Power Factor Correction (PFC) Boost converter topologies...IJARBEST JOURNAL
This paper provides a review of various Power Factor Correction (PFC) boost
converter topologies suitable for telecoms. A novel integrated PFC topology is proposed which acts
as a backup power supply for telecommunication systems. The advantage of the proposed circuit is
that it operates based on soft switching principle thereby reducing the switching losses in the
converter. The topologies analyzed in this paper are conventional average current mode control
boost PFC, bridgeless boost PFC, semi-bridgeless boost PFC, totem-pole bridgeless boost PFC and
proposed integrated boost PFC. All these topology studies are investigated by carrying out the
simulation of the converter circuits using PSIM software. A detailed comparison of all the
topologies have been done and they are compared in terms of supply power factor, supply current
THD and displacement factor. From the results, it is inferred that the proposed integrated PFC
provides a reduced supply current THD and improved power factor. The results are validated.
In this paper, several methods are developed to control the brushless DC (BLDC) motor speed. Since it is difficult to get a good showing by utilizing classical PID controller, the Dynamic Wavelet Neural Network (DWNN) is the proposed work in this paper, with parallel PID controller to obtain an novel controller named DWNN-PID controller. It collects the artificial neural ability of its networks for imparting from motor of BLDC with drive system and the ability of identification for the wavelet decomposition and control of the dynamic system furthermore to have ability for adapting and self-learning. The suggested controller method is utilizing to control the speed of BLDC motor of which supply a better showing than utilizing classical controllers with a wide range of control. The proposed controller parameters are matched continuously using Particle Swarm Optimization (PSO) algorithm. The simulation results based on proposed DWNN-PID controller demonstrate a superior in the stability and performance compared at utilizing classical WNN-PID and conventional PID controllers. The simulation results are accomplished using Matlab/Simulink. It shows that the proposed control scheme has a superior performance.
Analysis and design of single switch forward-flyback two-channel led driver w...LeMeniz Infotech
Analysis and design of single switch forward-flyback two-channel led driver with resonant-blocking capacitor
To Get this projects Call : 9566355386 / 99625 88976
Visit : www.lemenizinfotech.com / www.ieeemaster.com
Mail : projects@lemenizinfotech.com
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.
DTC Scheme for a Four-Switch Inverter-Fed PMBLDC Motor Emulating the Six-Swit...IJRST Journal
The paper deals with the direct torque control (DTC) of brushless DC (BLDC) motor drives fed by four-switch three phase inverters (FSTPI) rather than six-switch inverters (SSTPI) in conventional drives. For any three phase inverter require six switches, but these switches are reduced to four. This reduction of power switches from six to four improves the reliability of the inverter, size of the inverter is reduced and cost of the inverter is also reduces. The FSTPI could be regarded as a reconfigured topology of the SSTPI in case of a switch/leg failure which represents a crucial reliability benefit for many applications especially in electric and hybrid propulsion systems. The DTC of FSTPI-fed BLDC motor drives is treated considering two strategies, such as: 1) DTC-1: a strategy inspired from the one intended to SSTPI-fed BLDC motor drives; 2) DTC-2: a strategy that considers a dedicated vector selection subtable in order to independently control the torques developed by the phases connected to the FSTPI legs during their simultaneous conduction. The operational principle of the four-switch BLDC motor drive and the developed control scheme are theoretically analyzed and the performance is demonstrated by simulation.
Now day’s the power factor has become a major problem in power system to improve the power quality of the grid, as power factor is affected on the grid due to the nonlinear loads connected to it. Single phase bridgeless AC/DC power factor correction (PFC) topology to improve the power factor as well as the total harmonic distortion (THD) of the utility grid is proposed. By removing the input bridge in conventional PFC converters, the control circuit is simplified; the total harmonics distortion (THD) and power factor (PF) are improved. The PI controller operates in two loops one is the outer control loop which calculates the reference current through LC filter and signal processing. Inner current loop generates PWM switching signals through the PI controller. The output of the proposed PFC topology is verified for prototype using MATLAB circuit simulations. The experimental system is developed, and the simulation results are obtained.
The speed of a DC motor can be controlled by varying the voltage applied to the terminal. It can be done by controlling a PWM-VSC (PWM-Voltage Source Converter). This paper analyzes an control strategy of PWM-VSC using fuzzy logic to obtain varying DC voltage and according to the DC motor speed as desired. The control strategy of PWM-VSC directly using the switch variable in dq rotating reference frame as input variables. The fuzzy logic controller proposes to get a DC voltage variation stable by adjusting amplitudo of the network current. The simulation Fuzzy Logic Controller results show that the design fuzzy logic produce a good dynamic of DC voltage and DC motor speed without overshoot. On the network, Total Harmonic Distortion less than 5 % and unity power factor.
Direct Torque Control (DTC) is widely applied for ac motor drives as it offers high performance torque control with a simple control strategy. However, conventional DTC poses some disadvantages especially in term of variable switching frequency and large torque ripple due to the utilization of torque hysteresis controller. Other than that, performance of conventional DTC fed by two-level inverter is also restricted by the limited numbers of voltage vectors which lead to inappropriate selection of voltage vectors for different speed operations. This research aims to propose a Constant Switching Frequency (CSF) torque controller for DTC of induction motor (IM) fed by three-level Neutral-Point Clamped (NPC) inverter. The proposed torque controller utilizes PI controller which apply different gain for different speed operation. Besides, the utilization of NPC inverter provides greater number of voltage vectors which allow appropriate selection of voltage vectors for different operating condition. Using the proposed method, the improvement of DTC drives in term of producing a constant switching operation and minimizing torque ripple are achieved and validated via experimental results.
IMPLEMENTATION OF DISCONTINUOUS INDUCTOR CURRENT MODE IN CUK CONVERTERS FED B...Journal For Research
This paper presents a bridgeless Cuk converter-fed brushless DC (BLDC) motor drive. A Bridgeless Cuk converter is constructed to operate at discontinuous inductor current mode to improve the quality of power and power factor at the AC mains for better speed control. The bridgeless converter is designed for obtaining the low conduction losses and requirement of low size of heat sink for the switches. TI-TMS320-F2812-based Digital Signal Processor (DSP) is used for the development of the hardware prototype of proposed BLDC motor drive.
A three level quasi-two-stage single-phase pfc converter with flexible output...LeMeniz Infotech
A three level quasi-two-stage single-phase pfc converter with flexible output voltage and improved conversion efficiency
To Get this projects Call : 9566355386 / 99625 88976
Visit : www.lemenizinfotech.com / www.ieeemaster.com
Mail : projects@lemenizinfotech.com
Simulation Of A 4-Switch,3-Phase Inverter Fed Induction Motor (IM) Drive Systemijiert bestjournal
This paper investigates the performance of a 4 - switch,3 - phase inverter (4S3P) fed cost effective induction motor (IM)drive system for high performance industrial drive systems. In the proposed approach,instead of a conventional 6 - switch,3 - phase inverter (6S3P) a 4 - switch,3 - phase inverter is utilized. This reduces the cost of the inverter,the switching losses,and the complexity of the control algorithms and interface circuits to generate 6PWM logic signals. The Simulation results of the proposed 4S3P inverter fed drive is also made in terms of speed response &total harmonic distortion (THD) in terms of stator current and inverter current. The proposed inverter fed IM drive is fou nd acceptable considering its cost reduction and other advantageous features. A general space vector pulse width modulation (SVPWM) method for control of four - switch three - phase inverters is presented.
Hardware Implementation of Single Phase Power Factor Correction System using ...IAES-IJPEDS
Rapid increase of consumers in electronics devices and the use of mains rectification circuits inside these electronic devices is the root cause of mains harmonic distortion. Automatic power factor correction techniques can be applied to the industries, power systems and households to make them stable inturns increases the efficiency of system as well as the apparatus. This paper deals with the hardware design of active power factor correction circuit employing boost converter which is used to boost the DC voltages with a controller based on PID control strategy. The pulses given to power switches by pulse width modulation techniques generated by utilizing micro-controller board, Arduino thus obviating the need of complex hardware circuitry. MATLAB/SIMULINK was used to design and tune the PID controller parameters. The simulation results are matching with the predictions and the same was implemented as hardware. The waveforms various test points and across capacitors were obtained, studied and compared with the theoretical waveforms and are found to be in precise proximity of theoretical waveforms.
Comparative Study of Fuzzy Logic Based Speed Control of Multilevel Inverter f...IJPEDS-IAES
This paper presents a comparative analysis of speed control of brushless DC motor (BLDC) drive fed with conventional two-level, three and five level diode clamped multilevel inverter (DC-MLI). The performance of the drive system is successfully evaluated using Fuzzy Logic (FL) based speed controller. The control structure of the proposed drive system is described. The speed and torque characteristic of conventional two-level inverter is compared with the three and five-level multilevel inverter (MLI) for various operating conditions. The three and five level diode clamped multilevel inverters are simulated using IGBT’s and the mathematical model of BLDC motor has been developed in MATLAB/SIMULINK environment. The simulation results show that the Fuzzy based speed controller eliminate torque ripples and provides fast speed response. The developed Fuzzy Logic model has the ability to learn instantaneously and adapt its own controller parameters based on disturbances with minimum steady state error, overshoot and rise time of the output voltage.
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 International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
The papers for publication in The International Journal of Engineering& Science are selected through rigorous peer reviews to ensure originality, timeliness, relevance, and readability.
This paper presents the new generation of advanced gate driver circuit based on IR2110 device for a Single-Phase Matrix Converter (SPMC) circuit topology that uses MOSFETs or IGBTs switches. The new generation of gate drive circuit uses less number of components, since a single IR2110 device can drive two power switches, thus reduce power losses and minimize the complexity of conventional circuit. An additional isolation of the upper and lower sides of IR2110 device features additional protection to the proposed gate drive system. As a result, the proposed gate drive circuit just uses four IR2110 gate drives in order to control eight switches of SPMC circuit, thus, solve the conventional bulky gate drive circuit problem in SPMCs operation. This is in line with the international power electronic technology road-maps to reduce losses, cost, volume, therefore to raise up the power density of power electronics converters. Validation have been done through the experimental test-rig. As a result, such new theoretical enhancements can be used as a novel foundation of future high power density of SPMC circuit topology and in-line with the Fourth Industrial Revolution (IR 4.0) which were characterized mainly by advances in technology.
DC MOTOR SPEED CONTROL USING ON-OFF CONTROLLER BY PIC16F877A MICROCONTROLLERTridib Bose
This presentation consists the speed control of a dc motor using hardware (microcontroller) by changing the reference voltages logically and minimising errors.
Analysis of direct power control AC-DC converter under unbalance voltage supp...IJECEIAES
This paper presents an analysis of Direct Power Control (DPC) technique for the Three-Phase Pulse Width Modulation (PWM) AC-DC converter under unbalanced supply condition. Unbalance condition will cause the presence of unbalanced current and voltages thus produce the negative components on the grid voltage as well as severe performance degradation of a grid connected Voltage Source Inverter (VSI). The input structures for conventional DPC has been modified with a three simpler sequence networks instead of coupled by a detailed Three-Phase system method. The imbalance voltage can be resolved by separating from the individual elements of voltage and current into symmetrical components called Sequence Network. Consequently, the input power relatively improved during unbalanced condition almost 70% through the measurement of Total Harmonic Distortion (THD) from the conventional Direct Power Control (DPC) in individual elements which is higher compared to separate components. Hence, several analyses are performed in order to analyze the steady state and dynamic performance of the converter, particularly during the load and DC voltage output reference variations.
Closed Loop Speed Control of a BLDC Motor Drive Using Adaptive Fuzzy Tuned PI...IJERA Editor
Brushless DC Motors are widely used for many industrial applications because of their high efficiency, high
torque and low volume. This paper proposed an improved Adaptive Fuzzy PI controller to control the speed of
BLDC motor. This paper provides an overview of different tuning methods of PID Controller applied to control
the speed of the transfer function model of the BLDC motor drive and then to the mathematical model of the
BLDC motor drive. It is difficult to tune the parameters and get satisfied control characteristics by using normal
conventional PI controller. The experimental results verify that Adaptive Fuzzy PI controller has better control
performance than the conventional PI controller. The modeling, control and simulation of the BLDC motor have
been done using the MATLAB/SIMULINK software. Also, the dynamic characteristics of the BLDC motor (i.e.
speed and torque) as well as currents and voltages of the inverter components are observed by using the
developed model.
Phase-Shifted Full-Bridge Zero Voltage Switching DC-DC Converter Design with ...IJECEIAES
Design of phase-shifted full bridge zero voltage switching DC-DC converter has been very challenging due to circuit parasitic effect on the system dynamics. This paper presents steady-state analysis and iterative approach for the systemic design of phase-shifted full bridge DC-DC converter with improved dynamic performance and satisfactory operational requirement in terms of zero-voltage switching range, operating switching frequency and switching resonance. A 3 kW DC-DC converter is designed using the iterative design approach and the system dynamics performance was investigated in the MATLAB/Simulink environment. The converter zerovoltage switching simulation results were satisfactory with 90% efficiency under full load condition.
A Soft Switching Control Strategy Based On Interleaved Boost Converter for BL...IAES-IJPEDS
In this paper, Zero-Voltage-Transition (ZVT) based two-cell interleaved
boost Power Factor Correction (PFC) converter for permanent magnet
brushless DC motor (PMBLDCM) drive has been proposed.For achieving
soft switching, only one switch is used in auxiliary circuit which reduces the
torque ripple and switching losses. In this proposed control strategy, the DC
link voltage is which is proportional to the desired speed of the BLDC motor
controlled with interleaved boost converter. In this paper, six switch and four
switch VSI is implemented with interleaved boost converter topology. A
comparison is made between the six switch and four switch VSI fed
PMBLDC Motor drive and torque Analysis as been done. To validate the
proposed work, simulation study is presented. The results showed that
proposed converter control strategy operating under soft switching mode
improves the efficiency in wide range of the speed control.
Similar to An Improved DTFC based Five Levels - NPC Inverter Fed Induction Motor for Torque Ripple Minimization (20)
Inter-Area Oscillation Damping using an STATCOM Based Hybrid Shunt Compensati...IJPEDS-IAES
FACTS devices are one of the latest technologies which have been used to
improve power system dynamic and stability during recent years. However,
widespread adoption of this technology has been hampered by high cost
and reliability concerns. In this paper an economical phase imbalanced shunt
reactive compensation concept has been introduced and its ability for power
system dynamic enhancement and inter-area oscillation damping are
investigated. A hybrid phase imbalanced scheme is a shunt capacitive
compensation scheme, where two phases are compensated by fixed shunt
capacitor (C) and the third phase is compensated by a Static Synchronous
Compensator (STATCOM) in shunt with a fixed capacitor (CC). The power
system dynamic stability enhancement would be achieved by adding
a conventional Wide Area Damping Controller (WADC) to the main control
loop of the single phase STATCOM. Two different control methodologies
are proposed: a non-optimized conventional damping controller
and a conventional damping controller with optomised parameters that are
added to the main control loop of the unbalanced compensator in order to
damp the inter area oscillations. The proposed arrangement would, certainly,
be economically attractive when compared with a full three-phase
STATCOM. The proposed scheme is prosperously applied in a 13-bus
six-machine test system and various case studies are conducted to
demonstrate its ability in damping inter-area oscillations and power system
dynamic enhancement.
Fuzzy Gain-Scheduling Proportional–Integral Control for Improving the Speed B...IJPEDS-IAES
In this article, we have set up a vector control law of induction machine
where we tried different type of speed controllers. Our control strategy is of
type Field Orientated Control (FOC). In this structure we designed a Fuzzy
Gain-Scheduling Proportional–Integral (Pi) controller to obtain best result
regarding the speed of induction machine. At the beginning we designed a Pi
controller with fixed parameters. We came up to these parameters by
identifying the transfer function of this controller to that of Broïda (second
order transfer function). Then we designed a fuzzy logic (FL) controller.
Based on simulation results, we highlight the performances of each
controller. To improve the speed behaviour of the induction machine, we
have designend a controller called “Fuzzy Gain-Scheduling Proportional–
Integral controller” (FGS-PI controller) which inherited the pros of the
aforementioned controllers. The simulation result of this controller will
strengthen its performances.
Advance Technology in Application of Four Leg Inverters to UPQCIJPEDS-IAES
This article presents a novel application of four leg inverter with
conventional Sinusoidal Pulse Width Modulation (SPWM) Scheme to
Unified Power Quality Conditioner (UPQC). The Power Quality problem
became burning issues since the starting of high voltage AC transmission
system. Hence, in this article it has been discussed to mitigate the PQ issues
in high voltage AC systems through a three phase Unified Power Quality
Conditioner (UPQC) under various conditions, such as harmonic mitigation
scheme, non linear loads, sag and swell conditions as well. Also, it proposes
to control harmoincs with various artificial intelligent techniques. Thus
application of these control technique such as Neural Networks (ANN)
Fuzzy Logic makes the system performance in par with the standards
and also compared with existing system. The simulation results based on
MATLAB/Simulink are discussed in detail to support the concept developed
in the paper.
Modified SVPWM Algorithm for 3-Level Inverter Fed DTC Induction Motor DriveIJPEDS-IAES
In this paper, a modified space vector pulse width modulation (MSVPWM)
algorithm is developed for 3-level inverter fed direct torque controlled
induction motor drive (DTC-IMD). MSVPWM algorithm simplifies
conventional space vector pulse width modulation (CSVPWM) algorithm for
multilevel inverter (MLI), whose complexity lies in sector/subsector/subsubsector
identification; which will commensurate with number of levels. In
the proposed algorithm sectors are identified as in two level inverter
and subsectors/sub-subsectors are identified by shifting the original reference
vector to sector 1 (S1). This is valid due to the fact that a three level space
vector plane is a composition of six two level space planes, and are
symmetrical with reference to six pivot states. Switching state/sequence
selection is also very important while dealing with SVPWM strategy for
MLI. In the proposed algorithm out of 27 available switching states apt
switching state is selected based on sector and subsector number, such that
voltage ripple is considerably less. To validate the proposed algorithm, it is
tested on a three level neutral point clamped (NPC) inverter fed DTC-IMD.
The performance of the MSVPWM algorithm is analyzed by comparing no
load stator current ripple of the three level DTC-IMD with two level
DTC-IMD. Significant reduction in steady state torque and flux ripple is
observed. Hence, reduced acoustic noise is a distinctive facet of the proposed
method.
Modelling of a 3-Phase Induction Motor under Open-Phase Fault Using Matlab/Si...IJPEDS-IAES
The d-q model of Induction Motors (IMs) has been effectively used as an
efficient method to analyze the performance of the induction machines. This
study presents a step by step Matlab/Simulink implementation
of a star-connected 3-phase IM under open-phase fault (faulty 3-phase IM)
using d-q model. The presented technique in this paper can be simply
implemented in one block and can be made available for control purposes.
The simulated results provide to show the behavior of the star-connected 3-phase IM under open-phase fault condition.
Performance Characteristics of Induction Motor with FielIJPEDS-IAES
With development of power electronics and control Theories, the AC motor
control becomes easier. So the AC motors are used instead of the DC motor
in the drive applications. With this development, a several methods of control
are invented. The field oriented control and direct torque control are from the
best methods to control the drive systems. This paper is compared between
the field oriented control and direct torque control to show the advantages
and disadvantages of these methods of controls. This study discussed the
effects of these methods of control on the total harmonic distortion of the
current and torque ripples. This occurs through study the performance
characteristics of the AC motor. The motor used in this study is an induction
motor. This study is simulated through the MATLAB program.
A Novel Modified Turn-on Angle Control Scheme for Torque- Ripple Reduction in...IJPEDS-IAES
In recent years, Switched Reluctance Motors (SRM) have been dramatically
considered with both researchers and industries. SRMs not only have a
simple and reliable structure, but also have low cost production process.
However, discrete torque production of SRM along with intensive magnetic
saturation in stator and rotor cores are the major drawbacks of utilizing in
variety of industrial applications and also causes the inappropriate torque
ripples. In this paper, a modified logical-rule-based Torque Sharing Function
(TSF) method is proposed considering turn-on angle control. The optimized
turn-on angle for conducting each phase is achieved by estimating the
inductance curve in the vicinity of unaligned position and based on an
analytical solution for each phase voltage equation. Simulation results on a
four-phase switched reluctance motor and comparison with the conventional
methods validates the effectiveness of the proposed method.
Modeling and Simulation of Induction Motor based on Finite Element AnalysisIJPEDS-IAES
This paper presents the development of a co-simulation platform of induction
motor (IM). For the simulation, a coupled model is introduced which
contains the control, the power electronics and also the induction machine.
Each of these components is simulated in different software environments.
So, this study provides an advanced modeling and simulation tools for IM
which integrate all the components into one common simulation platform
environment. In this work, the IM is created using Ansys-Maxwell based on
Finite Element Analysis (FEA), whereas the power electronic converter is
developed in Ansys-Simplorer and the control scheme is build in MATLABSimulink
environment. Such structure can be useful for accurate design
and allows coupling analysis for more realistic simulation. This platform is
exploited to analyze the system models with faults caused by failures of
different drive’s components. Here, two studies cases are presented: the first
is the effects of a faulty device of the PWM inverter, and the second case is
the influence of the short circuit of two stator phases. In order to study the
performance of the control drive of the IM under fault conditions,
a co-simulation of the global dynamic model has been proposed to analyze
the IM behavior and control drives. In this work, the co-simulation has been
performed; furthermore the simulation results of scalar control allowed
verifying the precision of the proposed FEM platform.
Comparative Performance Study for Closed Loop Operation of an Adjustable Spee...IJPEDS-IAES
In this paper an extensive comparative study is carried out between PI
and PID controlled closed loop model of an adjustable speed Permanent
Magnet Synchronous Motor (PMSM) drive. The incorporation of Sinusoidal
Pulse Width Modulation (SPWM) strategy establishes near sinusoidal
armature phase currents and comparatively less torque ripples without
sacrificing torque/weight ratio. In this closed loop model of PMSM drive, the
information about reference speed is provided to a speed controller, to ensure
that actual drive speed tracks the reference speed with ideally zero steady
state speed error. The entire model of PMSM closed loop drive is divided
into two loops, inner loop current and outer loop speed. By taking the
different combinations of two classical controllers (PI & PID) related with
two loop control structure, different approximations are carried out. Hence a
typical comparative study is introduced to familiar with the different
performance indices of the system corresponding to time domain and
frequency domain specifications. Therefore overall performance of closed
loop PMSM drive is tested and effectiveness of controllers will be
determined for different combinations.
Sensorless Control of a Fault Tolerant PMSM Drives in Case of Single-Phase Op...IJPEDS-IAES
This paper introduces a sensorless-speed-controlled PMSM motor fed by a
four-leg inverter in case of a single phase open circuit fault regardless in
which phase is the fault. To minimize the system performance degradation
due to a single phase open circuit fault, a fault tolerant control strategy that
includes taking appropriate actions to control the two remaining healthy
currents is used in addition to use the fourth leg of the inverter. Tracking the
saliency is done through measuring the dynamic current responses of the
healthy phases of the PMSM motor due the IGBT switching actions using the
fundamental PWM method without introducing any modification to the
operation of the fourth leg of the inverter. Simulation results are provided to
verify the effectiveness of the proposed strategy for sensorless controlling of
a PMSM motor driven by a fault-tolerant four-phase inverter over a wide
speed ranges under the case of a single phase open circuit.
Improved Stator Flux Estimation for Direct Torque Control of Induction Motor ...IJPEDS-IAES
Stator flux estimation using voltage model is basically the integration of the
induced stator back electromotive force (emf) signal. In practical
implementation the pure integration is replaced by a low pass filter to avoid
the DC drift and saturation problems at the integrator output because of the
initial condition error and the inevitable DC components in the back emf
signal. However, the low pass filter introduces errors in the estimated stator
flux which are significant at frequencies near or lower than the cutoff
frequency. Also the DC components in the back emf signal are amplified at
the low pass filter output by a factor equals to . Therefore, different
integration algorithms have been proposed to improve the stator flux
estimation at steady state and transient conditions. In this paper a new
algorithm for stator flux estimation is proposed for direct torque control
(DTC) of induction motor drives. The proposed algorithm is composed of a
second order high pass filter and an integrator which can effectively
eliminates the effect of the error initial condition and the DC components.
The amplitude and phase errors compensation algorithm is selected such that
the steady state frequency response amplitude and phase angle are equivalent
to that of the pure integrator and the multiplication and division by stator
frequency are avoided. Also the cutoff frequency selection is improved; even
small value can filter out the DC components in the back emf signal. The
simulation results show the improved performance of the induction motor
direct torque control drive with the proposed stator flux estimation algorithm.
The simulation results are verified by the experimental results.
Minimization of Starting Energy Loss of Three Phase Induction Motors Based on...IJPEDS-IAES
The purpose of this paper is to minimize energy losses consumed by three
phase induction motors during starting with wide range of load torque from
no load to full load. This will limit the temperature rise and allows for more
numbers of starting during a definite time. Starting energy losses
minimization is achieved by controlling the rate of increasing voltage
and frequency to start induction motor under certain load torque within a
definite starting time. Optimal voltage and frequency are obtained by particle
swarm optimization (PSO) tool according to load torque. Then, outputs of the
PSO are used to design a neuro-fuzzy controller to control the output voltage
and frequency of the inverter during starting for each load torque. The
starting characteristics using proposed method are compared to that of direct
on line and V/F methods. A complete model of the system is developed using
SIMULINK/MATLAB.
Hardware Implementation of Solar Based Boost to SEPIC Converter Fed Nine Leve...IJPEDS-IAES
Multi level inverters are widely used in high power applications because of
low harmonic distortion. This paper deals with the simulation
and implementation of PV based boost to SEPIC converter with multilevel
inverter. The output of PV system is stepped up using boost to sepic
converter and it is converted into AC using a multilevel inverter.
The simulation and experimental results with the R load is presented in this
paper. The FFT analysis is done and the THD values are compared. Boost to
SEPIC converter is proposed to step up the voltage to the required value. The
experimental results are compared with the simulation results. The results
indicate that nine level inverter system has better performance than seven
level inverter system.
Transformer Less Voltage Quadrupler Based DC-DC Converter with Coupled Induct...IJPEDS-IAES
In this paper a voltage quadrupler dc-dc converter with coupled inductor
and π filter is presented. The use of the coupled inductor reduces the high
leakage inductance which is present in a transformer enabled converter.
The output ripples in the converter is reduced by providing a π filter.
The interleaved voltage quadrupler is used in this system in order to boost the
output voltage. The voltage multiplier improves the output voltage gain.
The main advantage of this system is more voltage gain when compared with
the transformer eneabled circuit and the overall efficiency of the system is
improved. The circuit is simple to control. As a final point of this research,
the simulation and the hardware investigational results are presented to
demonstrate the effectiveness of this proposed converter.
IRAMY Inverter Control for Solar Electric VehicleIJPEDS-IAES
Solar Electric Vehicles (SEV) are considered the future vehicles to solve the issues of air pollution, global warming, and the rapid decreases of the petroleum resources facing the current transportation technology. However, SEV are still facing important technical obstacles to overcome. They include batteries energy storage capacity, charging times, efficiency of the solar panels and electrical propulsion systems. Solving any of those problems and electric vehicles will compete-complement the internal combustion engines vehicles. In the present work, we propose an electrical propulsion system based on three phase induction motor in order to obtain the desired speed and torque with less power loss. Because of the need to lightweight nature, small volume, low cost, less maintenance and high efficiency system, a three phase squirrel cage induction motor (IM) is selected in the electrical propulsion system. The IM is fed from three phase inverter operated by a constant V/F control method and Space Vector Pulse Width Modulation (SVPWM) algorithm. The proposed control strategy has been implemented on the texas instruments TM320F2812 Digital Signal Processor (DSP) to generate SVPWM signal needed to trigger the gates of IGBT based inverter. The inverter used in this work is a three phase inverter IRAMY20UP60B type. The experimental results show the ability of the proposed control strategy to generate a three-phase sine wave signal with desired frequency. The proposed control strategy is experimented on a locally manufactured EV prototype. The results show that the EV prototype can be propelled to speed up to 60km/h under different road conditions.
Design and Implementation of Single Phase AC-DC Buck-Boost Converter for Powe...IJPEDS-IAES
This paper discusses the Power Factor Correction (PFC) for single phase AC-DC Buck-Boost Converter (BBC) operated in Continuous Conduction Mode (CCM) using inductor average current mode control. The proposed control technique employs Proportional-Integral (PI) controller in the outer voltage loop and the Inductor Average Current Mode Control (IACMC) in the inner current loop for PFC BBC. The IACMC has advantages such as robustness when there are large variations in line voltage and output load. The PI controller is developed by using state space average model of BBC. The simulation of the proposed system with its control circuit is implemented in MatLab/Simulink. The simulation results show a nearly unity power factor can be attained and there is almost no change in power factor when the line frequency is at various ranges. Experimental results are provided to show its validity and feasibility.
Improvement of Wind farm with PMSG using STATCOMIJPEDS-IAES
This paper studies about the dynamic performance of the Permanent Magnet Synchronous Generator with Static Synchronous Compensator (STATCOM) for Wind farm integration. A whole dynamic model of wind energy conversion system (WECS) with PMSG and STATCOM are established in a MATLAB environment. With this model the dynamic behaviour of the generator and the overall system has been studied to determine the performance of them with and without STATCOM. Final results portrays that the WECS based PMSG with STATCOM improves the transient response of the wind farm when the system is in fault.
Modeling and Control of a Doubly-Fed Induction Generator for Wind Turbine-Gen...IJPEDS-IAES
This paper presents a vector control direct (FOC) of double fed induction generator intended to control the generated stator powers. This device is intended to be implemented in a variable-speed wind-energy conversion system connected to the grid. In order to control the active and reactive power exchanged between the machine stator and the grid, the rotor is fed by a bi-directional converter. The DFIG is controlled by standard relay controllers. Details of the control strategy and system simulation were performed using Simulink and the results are presented in this here to show the effectiveness of the proposed control strategy.
A Review on Design and Development of high Reliable Hybrid Energy Systems wit...IJPEDS-IAES
Hybrid Energy system is a combination of two or more different types of energy resources. Now a day this hybrid energy system plays key role in various remote area power applications. Hybrid energy system is more reliable than single energy system. This paper deals with high reliable hybrid energy system with solar, wind and micro hydro resources. The proposed hybrid system cable of multi mode operation and high reliable due to non communicated based controllers (Droop Characteristic Control) are used for optimal power sharing. Size of battery can be reduced because hydro used as back up source and Maximum power point Tracking also applied to solar and wind energy systems.
Fuzzy Sliding Mode Control for Photovoltaic SystemIJPEDS-IAES
In this study, a fuzzy sliding mode control (FSMC) based maximum power point tracking strategy has been applied for photovoltaic (PV) system. The key idea of the proposed technique is to combine the performances of the fuzzy logic and the sliding mode control in order to improve the generated power for a given set of climatic conditions. Different from traditional sliding mode control, the developed FSMC integrates two parts. The first part uses a fuzzy logic controller with two inputs and 25 rules as an equivalent controller while the second part is designed for an online adjusting of the switching controller’s gain using a fuzzy tuner with one input and one output. Simulation results showed the effectiveness of the proposed approach achieving maximum power point. The fuzzy sliding mode (FSM) controller takes less time to track the maximum power point, reduced the oscillation around the operating point and also removed the chattering phenomena that could lead to decrease the efficiency of the photovoltaic system.
We have compiled the most important slides from each speaker's presentation. This year’s compilation, available for free, captures the key insights and contributions shared during the DfMAy 2024 conference.
Online aptitude test management system project report.pdfKamal Acharya
The purpose of on-line aptitude test system is to take online test in an efficient manner and no time wasting for checking the paper. The main objective of on-line aptitude test system is to efficiently evaluate the candidate thoroughly through a fully automated system that not only saves lot of time but also gives fast results. For students they give papers according to their convenience and time and there is no need of using extra thing like paper, pen etc. This can be used in educational institutions as well as in corporate world. Can be used anywhere any time as it is a web based application (user Location doesn’t matter). No restriction that examiner has to be present when the candidate takes the test.
Every time when lecturers/professors need to conduct examinations they have to sit down think about the questions and then create a whole new set of questions for each and every exam. In some cases the professor may want to give an open book online exam that is the student can take the exam any time anywhere, but the student might have to answer the questions in a limited time period. The professor may want to change the sequence of questions for every student. The problem that a student has is whenever a date for the exam is declared the student has to take it and there is no way he can take it at some other time. This project will create an interface for the examiner to create and store questions in a repository. It will also create an interface for the student to take examinations at his convenience and the questions and/or exams may be timed. Thereby creating an application which can be used by examiners and examinee’s simultaneously.
Examination System is very useful for Teachers/Professors. As in the teaching profession, you are responsible for writing question papers. In the conventional method, you write the question paper on paper, keep question papers separate from answers and all this information you have to keep in a locker to avoid unauthorized access. Using the Examination System you can create a question paper and everything will be written to a single exam file in encrypted format. You can set the General and Administrator password to avoid unauthorized access to your question paper. Every time you start the examination, the program shuffles all the questions and selects them randomly from the database, which reduces the chances of memorizing the questions.
Literature Review Basics and Understanding Reference Management.pptxDr Ramhari Poudyal
Three-day training on academic research focuses on analytical tools at United Technical College, supported by the University Grant Commission, Nepal. 24-26 May 2024
6th International Conference on Machine Learning & Applications (CMLA 2024)ClaraZara1
6th International Conference on Machine Learning & Applications (CMLA 2024) will provide an excellent international forum for sharing knowledge and results in theory, methodology and applications of on Machine Learning & Applications.
A review on techniques and modelling methodologies used for checking electrom...nooriasukmaningtyas
The proper function of the integrated circuit (IC) in an inhibiting electromagnetic environment has always been a serious concern throughout the decades of revolution in the world of electronics, from disjunct devices to today’s integrated circuit technology, where billions of transistors are combined on a single chip. The automotive industry and smart vehicles in particular, are confronting design issues such as being prone to electromagnetic interference (EMI). Electronic control devices calculate incorrect outputs because of EMI and sensors give misleading values which can prove fatal in case of automotives. In this paper, the authors have non exhaustively tried to review research work concerned with the investigation of EMI in ICs and prediction of this EMI using various modelling methodologies and measurement setups.
Using recycled concrete aggregates (RCA) for pavements is crucial to achieving sustainability. Implementing RCA for new pavement can minimize carbon footprint, conserve natural resources, reduce harmful emissions, and lower life cycle costs. Compared to natural aggregate (NA), RCA pavement has fewer comprehensive studies and sustainability assessments.
Low power architecture of logic gates using adiabatic techniquesnooriasukmaningtyas
The growing significance of portable systems to limit power consumption in ultra-large-scale-integration chips of very high density, has recently led to rapid and inventive progresses in low-power design. The most effective technique is adiabatic logic circuit design in energy-efficient hardware. This paper presents two adiabatic approaches for the design of low power circuits, modified positive feedback adiabatic logic (modified PFAL) and the other is direct current diode based positive feedback adiabatic logic (DC-DB PFAL). Logic gates are the preliminary components in any digital circuit design. By improving the performance of basic gates, one can improvise the whole system performance. In this paper proposed circuit design of the low power architecture of OR/NOR, AND/NAND, and XOR/XNOR gates are presented using the said approaches and their results are analyzed for powerdissipation, delay, power-delay-product and rise time and compared with the other adiabatic techniques along with the conventional complementary metal oxide semiconductor (CMOS) designs reported in the literature. It has been found that the designs with DC-DB PFAL technique outperform with the percentage improvement of 65% for NOR gate and 7% for NAND gate and 34% for XNOR gate over the modified PFAL techniques at 10 MHz respectively.
2. ISSN: 2088-8694
IJPEDS Vol. 7, No. 2, June 2016 : 531 – 542
532
dc-link voltage. As a result, the converter can be deal with the double voltage and power value
compared to standard two-level VSI with the same switching frequency. In general the NPC topology has
been constructed by higher number of power switches so thus additional control scheme required. Dc link
neutral point clamping is need for maintaining balanced voltage [4-6].
High number of five level NPC inverter fed with high performance IM drives which is requires
decoupled torque and flux control. DTFC technique is avoiding the stator current decoupling problem [13].
Additionally DTFC provides very fast torque and speed response without any complex in inner current
regulation loop. DTFC–SPWM scheme has enhanced the fundamental output voltages by extend the linear
modulation range.
In this paper, stator resistance estimation based DTFC by incorporating SPWM scheme has
proposed to uses stator current error as variable through PI controller. Five levels NPC inverter has been
equated the DC link voltage into inverting AC voltage. Space vector estimated NPC inverters have been
minimized the torque ripples and voltage saturations. The voltage balancing capability is also improved.
2. FIVE LEVEL NPC INVERTER
The five-level neutral-pointed clamped (NPC-5L) topology is shown in figure (1). Each leg of the
NPC has constructed by eight active switches (Q1, Q2, Q3, Q4, Q5, Q6, Q7 and Q8) and converter [7-8]. The
switching states are given in table 1. An inverter stage connected to an MV induction machine (IM).
Generally a standard direct-on-line (DOL) method can be followed for control purpose. Since the value of
leakage inductance is xσ, range of 0.18 p.u.
The NPC can be able to minimize the harmonic distortion of the stator current. Further the active
switches of the converter are operated at low frequency. The SPWM scheme has overcomes the limitations of
the modulation index range of PWM methods. The SPWM controller is suitable to achieve the current
harmonics [9-10]. The 5L-NPC inverter derived from 3L-NPC inverter. The Three phase NPC-5L voltage is
derived from phase capacitor Cph feed series connected capacitor output voltage.
Figure 1. 5L-NPC inverter circuit diagram
3. IJPEDS ISSN: 2088-8694
An Improved DTFC based Five Levels - NPC Inverter Fed Induction Motor for Torque …(P Rajasekaran)
533
Table 1. Switching Table
SWITCHING STATES
OUTPUT VOLTAGE
Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8
1 1 1 1 0 0 0 0 Vdc/2
0 1 1 1 1 0 0 0 Vdc/4
0 0 1 1 1 1 0 0 0
0 0 0 1 1 1 1 0 -Vdc/4
0 0 0 0 1 1 1 1 -Vdc/2
The desired dc link voltage is Vdc, each capacitor (C1, C2, C3, C4) has been splits voltage (1/4)
Vdc. The dc link capacitor currents are flows through the active switches by named as ic1, ic2, ic3 and ic4.
This converter ac voltages and currents of the each phase are derived by var, vbr and vcr (ia, ib & ic)
connected to the induction drive.
3. MODEL OF INDUCTION MOTOR
The three phase induction motor has constructed by n number of stator windings that are displaced
by (360˚/n). It can process at every 120˚. A typical isolated neutral five-leg inverter configuration is used to
drive a star-connected five-phase squirrel-cage induction motor. Since the considered squirrel-cage stator and
rotor can be represented by a short-circuited three-phase rotor winding in induction motor [11-12]. The state
equation of induction motor written by stator reference frame (α, β) coordinates, can be given follows such as
stator and rotor laminated model shown in figure 2.
Figure 2. Stator and rotor lamination
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Table 1. Switching Table
SWITCHING STATES
OUTPUT VOLTAGE
Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8
1 1 1 1 0 0 0 0 Vdc/2
0 1 1 1 1 0 0 0 Vdc/4
0 0 1 1 1 1 0 0 0
0 0 0 1 1 1 1 0 -Vdc/4
0 0 0 0 1 1 1 1 -Vdc/2
The desired dc link voltage is Vdc, each capacitor (C1, C2, C3, C4) has been splits voltage (1/4)
Vdc. The dc link capacitor currents are flows through the active switches by named as ic1, ic2, ic3 and ic4.
This converter ac voltages and currents of the each phase are derived by var, vbr and vcr (ia, ib & ic)
connected to the induction drive.
3. MODEL OF INDUCTION MOTOR
The three phase induction motor has constructed by n number of stator windings that are displaced
by (360˚/n). It can process at every 120˚. A typical isolated neutral five-leg inverter configuration is used to
drive a star-connected five-phase squirrel-cage induction motor. Since the considered squirrel-cage stator and
rotor can be represented by a short-circuited three-phase rotor winding in induction motor [11-12]. The state
equation of induction motor written by stator reference frame (α, β) coordinates, can be given follows such as
stator and rotor laminated model shown in figure 2.
Figure 2. Stator and rotor lamination
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Table 1. Switching Table
SWITCHING STATES
OUTPUT VOLTAGE
Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8
1 1 1 1 0 0 0 0 Vdc/2
0 1 1 1 1 0 0 0 Vdc/4
0 0 1 1 1 1 0 0 0
0 0 0 1 1 1 1 0 -Vdc/4
0 0 0 0 1 1 1 1 -Vdc/2
The desired dc link voltage is Vdc, each capacitor (C1, C2, C3, C4) has been splits voltage (1/4)
Vdc. The dc link capacitor currents are flows through the active switches by named as ic1, ic2, ic3 and ic4.
This converter ac voltages and currents of the each phase are derived by var, vbr and vcr (ia, ib & ic)
connected to the induction drive.
3. MODEL OF INDUCTION MOTOR
The three phase induction motor has constructed by n number of stator windings that are displaced
by (360˚/n). It can process at every 120˚. A typical isolated neutral five-leg inverter configuration is used to
drive a star-connected five-phase squirrel-cage induction motor. Since the considered squirrel-cage stator and
rotor can be represented by a short-circuited three-phase rotor winding in induction motor [11-12]. The state
equation of induction motor written by stator reference frame (α, β) coordinates, can be given follows such as
stator and rotor laminated model shown in figure 2.
Figure 2. Stator and rotor lamination
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UBXAX .. (1)
XCY . (2)
Where A, B and C are the evolution of the control and observation matrices respectively.
t
rrisisX ;
V s
V s
U
Is
Is
Y
(3)
TrTr
M
TrTr
M
MTRMTrTS
MMTRTrTS
A
1
0
1
0
1111
0
11
0
11
(4)
With, ω Rotor speed and the machine’s parameters are Rs, Rr, M, Ls, Lr and p are given by,
Rs
Ls
T s
Rr
Lr
T r , (5)
The mechanical equation is derived in equation (7)
.. fcrCedt
d
J (6)
J is the inertia coefficient and using the Laplace transform, the equation (8) shows that the relation between
the stator flux and the rotor flux represents a low pass with time constant . The electromagnetic torque
can be expressed as,
sT r
s
LS
M
r
1
(7)
issaissa
p
Ce
22
3
(8)
4. IMPROVED DTFC SCHEME FOR INDUCTION MOTOR
The DTFC method is proposed for induction motor controlling purpose since it can be provide a
very accurate and fast decoupled control of the stator flux linkage and the electromagnetic torque without
help of any current regulators [14]. The DTFC with stator resistance estimator is shown in figure 3. This
strategy of control competitive compare to the rotor flux oriented method [15]. The lookup table can be
derived by based on the selected torque error signal in input comparator side.
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Figure 3. Improved DTFC block diagram with stator resistance estimator
This control technique is fully depends upon the converter active switching operating level. The
selection of controlling parts are generally based on the use of hysteresis regulators and SPWM technique,
amplitude of the stator flux and electromagnetic torque can be controlled by this modified state of system.
The stator flux is derived in equation (1), can be approximately simplified in equation (2) the stator resistance
is ignored since it can be derived in short period.
dt
t
ISRSV SSs
0
(9)
dt
t
V Ssos
0
(10)
During sampling time Te period the vector tension applied to the machine remains constant, and
thus one can be written as,
t
TeV sksks
0
.)()1( (11)
Therefore to increase the stator flux, we can apply a vector of tension that is co-linear in its direction
and vice-versa. Figure 4 shows the stator flux increment and spatial positions of the voltage vectors keeping
the flux inside of the strip hysteresis.
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Figure 4. Stator flux increment and spatial positions of the voltage vectors
Figure 5. Components of the error of flux at the time of the application of the vector V2 voltage
If the error of flux is estimate on the direction of stator flux and on a perpendicular direction shown
in figure 5, one puts in evidence the components acting on the torque and on the flux. The component sf ∆Φ
gives the electromagnetic Torque of the Induction motor while the component sf ∆Φ modifies the magnitude
of stator flux. The torque is produced by the induction motor can be expressed as equation:
sin
2
3
rs
rLsL
M
pCe (12)
The torque depends on the amplitude of two vectors such as stator flux Φ , rotor flux Φ and their
relative position γ. If one succeeds in perfectly controlling the flux Φ (starting with Vs) in module and in
position, one can subsequently control the amplitude and the relative position of Φ .
5. PI RESISTANCE ESTIMATORS FOR DTFC DRIVE
Based on the relationship between change of resistance and change of current, a PI resistance
estimator can be constructed in equation (10) as shown in Figure.6.
s
K I
K PiRS (13)
Where and are the proportional and integral gains of the PI estimator.
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Figure 6. Block diagram of PI resistance estimator
When the stator resistance changes, the compensation process can be depicted as the change of
stator resistance will change the amplitude of the current vector [16]. The error of the amplitude of current
vector and that of the reference current vector will be used to compensate the change in stator resistance until
the error in current becomes zero. Therefore, the steady state error of this resistance estimator is zero and the
reference current vector can be derived from the reference torque and reference flux as,
isisis
* 2
* 2*
(14)
sref
Ceref
p
is
2
3
2* (15)
∗
is derived from the following equation, which is equated into zero expressed as,
0
2
* 2*.
1* 2
LS
sref
isaLsisasrefisaLS
(16)
The filter time constant should be small compared to the stator resistance estimator time constant
because to overcome its effect on the stator resistance adaptation. The final estimated stator resistance is
again passed through a low pass filter to have a smooth variation of stator resistance value. This updated
stator resistance can be used directly in the controller. A PI controller is used to regulate the output voltage to
achieve the reputed stator current and also torque. The PI controller limits the transient response of the torque
controller. DTFC uses an induction motor model to achieve a desired output torque by using stator resistance
estimator.
An induction motor model is used to predict the voltage required to drive the flux and torque to
demanded values within a fixed time period. This calculated voltage and current are synthesized using space
vector modulation (SVM).
6. RESULT AND ANALYSIS
This section evaluates the performance of the direct torque flux control strategy (DTFC) based NPC
five level inverter for induction motor operation. The results are verified and compared with conventional
VSI under different control techniques in MATLAB /SIMULINK. Induction motor specifications of
proposed topology are listed in table 1. If the level of inverter increased means, current harmonics could be
reduced. The conventional VSI based induction motor has been implemented by using field oriented control
and Direct Torque control.
The dynamic performance of the IM drive system for various operating conditions has been studied
with the uses of DTFC controller. The proposed NPC interfaced IM drive arrangement is shown in fig: 7.
three phase NPC inverter stator voltages are illustrated in fig: 8. DTFC based induction motor has achieves
superior controlled constant speed, reduced ripple content in stator current and minimized torque ripples.
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This is illustrated in fig: 9 & 10 respectively. Fig: 11 and 12 shows the stator current and torque waveform
and difference between the signals of torque.
The Different kind of harmonic order of the torque signals are shown in figure 13. The performance
of conventional VSI based induction motor under DTC and FOC control techniques are shown in figures 14
& 15. Figure 16 shows the THD in phase current for elimination of harmonics. The Proposed topology
Simulation results have shows the smooth and improved performance of the motor compared to Conventional
VSI based structure. The total harmonic distortion can be obtained such as 22.91% for FOC control scheme
and 78.87% for DTC control scheme. The current harmonic would be reduced as 8.29% by using DTFC
based five levels NPC of induction motor.
Figure 7. Simulation circuit diagram for NPC-IM
Figure 8. Five Level-NPC inverter voltage
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Figure 9. IM drive performance at starting time
Figure 10. IM drive performance at running time
Figure 11. Stator current and torque waveform
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Figure 12. Error Signal of Torque
Figure 13. Torque waveforms for different harmonic order
Figure 14. DTC based induction motor performance
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Figure 15. FOC Based induction motor performance
Figure 16. FFT Analysis for proposed topology
Table 2. Simulation Parameter
Name Values
Rated Power 1kw
Rated Speed 1500 rpm
Rated Voltage 220 V
Stator and Rotor Resistance 6.8 Ω-5.43 Ω
Stator and Rotor Inductance 0.3973 H-0.3558 H
Mutual Inductance 0.3558 H
Number of pole pairs 2
Motor Load-Inertia 0.02 Kg.m2
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7. CONCLUSIONS
A five level Neutral Point Clamped (NPC) inverter based DTFC controlled IM (Induction Motor)
drive is presented. Generally the stator current is very highly affected by the harmonic components. It can
affect torque to produce high torque ripple in IM at maximum to low speed region. The NPC inverter has
reduced the torque ripples and voltage saturations. The levels are increased and current harmonics has
minimized. DTFC controller based space vector modulation technique has optimised and achieved better
dynamic performance under various operating conditions. The conventional VSI based topology has been
implemented and the results compared with 5L- NPC based induction motor for torque ripple minimizations.
Thus the proposed inverter has achieved better torque and constant speed under simulink environment.
REFERENCES
[1] A. Larabi and M.S. Boucherit, “Vector Control of asynchronous machine Taking into accont discretisation
problems of the command as well as the Park reverse Transformation”, Electromotion. Marrakesh, vol. 10, pp.
489–493, November 2003.
[2] Abbou, A.; Mahmoudi, H., "Real time implementation of a sensor less speed control of induction motor using
DTFC strategy", ICMCS. International Conference on Multimedia Computing and Systems. April 2009; 2(4); 327-
333.
[3] Bennassar, A., A. Abbou, M. Akherraz, and M. Barara. "Sensorless back stepping control using an adaptive
Luenberger observer with three levels NPC inverter", WASET, International Journal of Electrical Science and
Engineering. 2013; 7(8), 1102-1108.
[4] Bose BK, Power electronics and Ac drives, New-Jersey, USA, Prentice Hall, and Englewood Cliffs, 1986; 122-152.
[5] Byeong-Seok Lee; Krishnan, R., "Adaptive stator resistance compensator for high performance direct torque
controlled induction motor drives", Thirty-Third IAS Annual Meeting IEEE on Industry Applications Conference.
Oct. 1998; 12(15); 423-430.
[6] Celanovic, N.; Boroyevich, D., "A comprehensive study of neutral-point voltage balancing problem in three-level
neutral-point-clamped voltage source PWM inverters", IEEE Transactions on Power Electronics. Mar 2000; 15(2);
242-249.
[7] Colak, Ilhami, Ersan Kabalci, and Gokhan Keven. "Comparison of multi-carrier techniques in seven-level
asymmetric cascade multilevel inverter", Fourth International Conference on Power Engineering, Energy and
Electrical Drives (POWERENG). 2013; 1619-1624.
[8] Franquelo, L.G.; Napoles, J.; Guisado, R.C.P.; Leon, J.I.; Aguirre, M.A., "A Flexible Selective Harmonic
Mitigation Technique to Meet Grid Codes in Three-Level PWM Converters", IEEE Transactions on Industrial
Electronics. Dec. 2007; 54(6); 3022-3029.
[9] Gupta, A.K.; Khambadkone, A.M., "A Simple Space Vector PWM Scheme to Operate a Three-Level NPC Inverter
at High Modulation Index Including Over modulation Region, With Neutral Point Balancing," IEEE Transactions
on Industry Applications. May-June 2007; 43(3); 751-760.
[10] Holtz, J.; Oikonomou, N., "Neutral Point Potential Balancing Algorithm at Low Modulation Index for Three-Level
Inverter Medium-Voltage Drive,," IEEE Transactions on Industry Applications. May-June 2007; 43(3); 761-768.
[11] Khajehoddin, S.A.; Bakhshai, A.; Jain, P.K., "A Voltage Balancing Method and its Stability Boundary for Five-
Level Diode-Clamped Multilevel Converters", IEEE on Power Electronics Specialists Conference, PESC. June
2007; 17(21); 2204-2208.
[12] Kyung-Seo Kim, Sung-Hoon Byun “Auto-Measurement of Induction Motor Parameters,” Journal of Electrical
Engineering & Technology, 2006; 1(2); 226-232.
[13] Leonhard W, Control of electrical drives, Berlin, Germany: Springer-Verlag, 1990.
[14] Mini R, Saranya C, Satheesh BH, Dinesh MN. Low Speed Estimation in Sensorless Direct Torque Controlled
Induction Motor Drive using Extended Kalman Filter. International Journal of Power Electronics and Drive
Systems (IJPEDS). 2015; 6(4), pp. 819-830.
[15] Mohsen Hosseinzadeh Soreshjani, Ahmad Ghafari and Reza Heidari,“ The Application of Classical Direct Torque
and Flux Control (DTFC) for Line-Start Permanent Magnet Synchronous and its Comparison with Permanent
Magnet Synchronous Motor,” J Electr Eng Technol. 2014; 9(6); 1954-1959.
[16] Patel, Hasmukh S.; Hoft, R.G., "Generalized Techniques of Harmonic Elimination and Voltage Control in Thyristor
Inverters: Part I--Harmonic Elimination", IEEE Transactions on Industry Applications. May 1973; 9(3); 310-317.
[17] Satyanarayana K, Anjaneyulu B, Prasad KS. Performance Improvement of Multi Level Inverter fed Vector
Controlled Induction Motor Drive for Low Speed Operations. International Journal of Power Electronics and
Drive Systems (IJPEDS). 2014; 4(1): 51-60.
[18] Z. Boulghasoul, A. Elbacha, E. Elwarraki, “intelligent Control for Torque Ripple Minimization in Combined
Vector and Direct Controls for High Performance of IM Drive”, Journal of Electrical Engineering & Technology.
2012; 7(4); 546-557.