This document describes the simulation of a dynamic voltage restorer (DVR) using PI control with fuzzy logic to mitigate voltage sags. A DVR is connected between a distribution system and critical load to inject compensating voltages during faults. The control system uses PI controllers for the dq components of load voltage with additional fuzzy logic control. Simulation results under different fault conditions show the DVR maintains the load voltage, demonstrating its effectiveness in compensating voltage sags. Total harmonic distortion is also improved by increasing the DC link voltage of the DVR. The PI with fuzzy logic control provides faster response compared to conventional controllers.
Power Quality Enhancement in Power Distribution system using Artificial intel...sundar balan
Dynamic voltage Restorer
Artificial intelligence based Dynamic voltage restorer
DVR
Artificial neural network based DVR dynamic voltage restorer
Harmonics voltage harmonics voltage sag voltage swell
Power Quality Enhancement in Power Distribution system using Artificial intelligence based Dynamic Voltage Restorer
Mitigation of Voltage Sag/Swell with Fuzzy Control Reduced Rating DVRIJERD Editor
Power quality has been an issue that is becoming increasingly pivotal in industrial electricity
consumers point of view in recent times. Modern industries employ Sensitive power electronic equipments,
control devices and non-linear loads as part of automated processes to increase energy efficiency and
productivity. Voltage disturbances are the most common power quality problem due to this the use of a large
numbers of sophisticated and sensitive electronic equipment in industrial systems is increased. This paper
discusses the design and simulation of dynamic voltage restorer for improvement of power quality and
reduce the harmonics distortion of sensitive loads. Power quality problem is occurring at non-standard
voltage, current and frequency. Electronic devices are very sensitive loads. In power system voltage sag,
swell, flicker and harmonics are some of the problem to the sensitive load. The compensation capability
of a DVR depends primarily on the maximum voltage injection ability and the amount of stored
energy available within the restorer. This device is connected in series with the distribution feeder at
medium voltage. A fuzzy logic control is used to produce the gate pulses for control circuit of DVR and the
circuit is simulated by using MATLAB/SIMULINK software.
International Journal of Engineering Research and Applications (IJERA) is a team of researchers not publication services or private publications running the journals for monetary benefits, we are association of scientists and academia who focus only on supporting authors who want to publish their work. The articles published in our journal can be accessed online, all the articles will be archived for real time access.
Our journal system primarily aims to bring out the research talent and the works done by sciaentists, academia, engineers, practitioners, scholars, post graduate students of engineering and science. This journal aims to cover the scientific research in a broader sense and not publishing a niche area of research facilitating researchers from various verticals to publish their papers. It is also aimed to provide a platform for the researchers to publish in a shorter of time, enabling them to continue further All articles published are freely available to scientific researchers in the Government agencies,educators and the general public. We are taking serious efforts to promote our journal across the globe in various ways, we are sure that our journal will act as a scientific platform for all researchers to publish their works online.
International Journal of Engineering Research and Applications (IJERA) is a team of researchers not publication services or private publications running the journals for monetary benefits, we are association of scientists and academia who focus only on supporting authors who want to publish their work. The articles published in our journal can be accessed online, all the articles will be archived for real time access.
Our journal system primarily aims to bring out the research talent and the works done by sciaentists, academia, engineers, practitioners, scholars, post graduate students of engineering and science. This journal aims to cover the scientific research in a broader sense and not publishing a niche area of research facilitating researchers from various verticals to publish their papers. It is also aimed to provide a platform for the researchers to publish in a shorter of time, enabling them to continue further All articles published are freely available to scientific researchers in the Government agencies,educators and the general public. We are taking serious efforts to promote our journal across the globe in various ways, we are sure that our journal will act as a scientific platform for all researchers to publish their works online.
Dvr Based Power Quality Improvement In Distribution Systeminventionjournals
International Journal of Engineering and Science Invention (IJESI) is an international journal intended for professionals and researchers in all fields of computer science and electronics. IJESI publishes research articles and reviews within the whole field Engineering Science and Technology, new teaching methods, assessment, validation and the impact of new technologies and it will continue to provide information on the latest trends and developments in this ever-expanding subject. The publications of papers are selected through double peer reviewed to ensure originality, relevance, and readability. The articles published in our journal can be accessed online.
Power Quality Enhancement in Power Distribution system using Artificial intel...sundar balan
Dynamic voltage Restorer
Artificial intelligence based Dynamic voltage restorer
DVR
Artificial neural network based DVR dynamic voltage restorer
Harmonics voltage harmonics voltage sag voltage swell
Power Quality Enhancement in Power Distribution system using Artificial intelligence based Dynamic Voltage Restorer
Mitigation of Voltage Sag/Swell with Fuzzy Control Reduced Rating DVRIJERD Editor
Power quality has been an issue that is becoming increasingly pivotal in industrial electricity
consumers point of view in recent times. Modern industries employ Sensitive power electronic equipments,
control devices and non-linear loads as part of automated processes to increase energy efficiency and
productivity. Voltage disturbances are the most common power quality problem due to this the use of a large
numbers of sophisticated and sensitive electronic equipment in industrial systems is increased. This paper
discusses the design and simulation of dynamic voltage restorer for improvement of power quality and
reduce the harmonics distortion of sensitive loads. Power quality problem is occurring at non-standard
voltage, current and frequency. Electronic devices are very sensitive loads. In power system voltage sag,
swell, flicker and harmonics are some of the problem to the sensitive load. The compensation capability
of a DVR depends primarily on the maximum voltage injection ability and the amount of stored
energy available within the restorer. This device is connected in series with the distribution feeder at
medium voltage. A fuzzy logic control is used to produce the gate pulses for control circuit of DVR and the
circuit is simulated by using MATLAB/SIMULINK software.
International Journal of Engineering Research and Applications (IJERA) is a team of researchers not publication services or private publications running the journals for monetary benefits, we are association of scientists and academia who focus only on supporting authors who want to publish their work. The articles published in our journal can be accessed online, all the articles will be archived for real time access.
Our journal system primarily aims to bring out the research talent and the works done by sciaentists, academia, engineers, practitioners, scholars, post graduate students of engineering and science. This journal aims to cover the scientific research in a broader sense and not publishing a niche area of research facilitating researchers from various verticals to publish their papers. It is also aimed to provide a platform for the researchers to publish in a shorter of time, enabling them to continue further All articles published are freely available to scientific researchers in the Government agencies,educators and the general public. We are taking serious efforts to promote our journal across the globe in various ways, we are sure that our journal will act as a scientific platform for all researchers to publish their works online.
International Journal of Engineering Research and Applications (IJERA) is a team of researchers not publication services or private publications running the journals for monetary benefits, we are association of scientists and academia who focus only on supporting authors who want to publish their work. The articles published in our journal can be accessed online, all the articles will be archived for real time access.
Our journal system primarily aims to bring out the research talent and the works done by sciaentists, academia, engineers, practitioners, scholars, post graduate students of engineering and science. This journal aims to cover the scientific research in a broader sense and not publishing a niche area of research facilitating researchers from various verticals to publish their papers. It is also aimed to provide a platform for the researchers to publish in a shorter of time, enabling them to continue further All articles published are freely available to scientific researchers in the Government agencies,educators and the general public. We are taking serious efforts to promote our journal across the globe in various ways, we are sure that our journal will act as a scientific platform for all researchers to publish their works online.
Dvr Based Power Quality Improvement In Distribution Systeminventionjournals
International Journal of Engineering and Science Invention (IJESI) is an international journal intended for professionals and researchers in all fields of computer science and electronics. IJESI publishes research articles and reviews within the whole field Engineering Science and Technology, new teaching methods, assessment, validation and the impact of new technologies and it will continue to provide information on the latest trends and developments in this ever-expanding subject. The publications of papers are selected through double peer reviewed to ensure originality, relevance, and readability. The articles published in our journal can be accessed online.
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.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.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
International Refereed Journal of Engineering and Science (IRJES)irjes
The core of the vision IRJES is to disseminate new knowledge and technology for the benefit of all, ranging from academic research and professional communities to industry professionals in a range of topics in computer science and engineering. It also provides a place for high-caliber researchers, practitioners and PhD students to present ongoing research and development in these areas.
Simulation and Comparison of DVR and DSTATCOM Used for voltage sag mitigation...paperpublications3
Abstract: Power Quality problem in a system leads to various disturbances such as voltage fluctuations, transients and waveform distortions that results in a mis-operation or a failure of end user equipment. There are different types of custom power devices like Distribution Static Compensator (D-STATCOM) and Dynamic Voltage Restorer (DVR) which can effectively use for mitigation of different type of power quality problems. This paper describes the technique of correcting the supply voltage sag distributed system and also describes performance comparison are presented between DVR and DSTATCOM to know how both the devices successfully been applied to power system for regulating system voltage effectively. DSTATCOM and DVR both of them based on VSI principle. A DVR is a series compensation device which injects a voltage in series with system and a DSTATCOM is a shunt compensation device which injects a current into the system to correct the power quality problems. This paper presents a power system operation with PI controller with abc to dq0 convertor approach. Total Harmonics Distortion (THD) is also calculated for the system with and without compensation. Results are presented to assess the performance of devices as a potential custom power solution. Improve dynamic voltage control and thus increase system load ability. This paper presents modeling and simulation of DVR & DSTATCOM in MATLAB/Simulink.
Field Programmable Gate Array (FPGA) - Based Pulse Width Modulation for Singl...IJSRD
Active filtering of electric power has now become a mature technology for harmonic and reactive power compensation in two-wire (single phase), three-wire (three phase without neutral), and four-wire (three phase with neutral) ac power networks with nonlinear loads. This paper presents the simulations of Field programmable gate array (FPGA) - based single phase hybrid active power filters of two different configurations using Xilinx system generator. The former one with the hybrid combination of series active power filter and shunt passive filter is designed to mitigate the distortions in source voltage and source current due to the voltage source type harmonic load and the latter one with the hybrid combination of shunt active power filter and shunt passive filter is designed to mitigate the harmonics in source current due to the current source type harmonic load.
Soft Switched Multi-Output Flyback Converter with Voltage DoublerIJPEDS-IAES
A novel multi-output voltage doubler circuit with resonant switching
technique is proposed in this paper. The resonant topology in the primary
side of the flyback transformer switches the device either at zero voltage or
current thus optimizing the switching devices by mitigating the losses. The
voltage doubler circuit introduced in the load side increases the voltage by
twice the value thereby increasing the load power and density. The proposed
Multi-output Isolated Converter removes the need for mutiple SMPS units
for a particular application. This reduces the size and weight of the
converters considerably leading to a greater payload. This paper aims at
optimizing the proposed converter with some design changes. The results
obtained from the hardware prototype are given in a comprehensive manner
for a 3.5W converter operating at output voltages of 5V and 3.3V at 50 kHz
switching frequency. The converter output is regulated with the PI controller
designed with SG3523 IC. The effects of load and line regulation for ±20%
variations are analyzed in detail.
Design and Analysis of Adaptive Neural Controller for Voltage Source Converte...IDES Editor
Usually a STATCOM is installed to support power
system networks that have a poor power factor and often poor
voltage regulation. It is based on a power electronics voltagesource
converter. Various PWM techniques make selective
harmonic elimination possible, which effectively control the
harmonic content of voltage source converters. The distribution
systems have to supply unbalanced nonlinear loads transferring
oscillations to the DC-side of the converter in a realistic
operating condition. Thus, additional harmonics are modulated
through the STATCOM at the point of common coupling
(PCC). This requires more attention when switching angles are
calculated offline using the optimal PWM technique. This
paper, therefore, presents the artificial neural network model
for defining the switching criterion of the VSC for the
STATCOM in order to reduce the total harmonic distortion
(THD) of the injected line current at the PCC. The model takes
into the account the dc capacitor effect, effects of other possible
varying parameters such as voltage unbalance as well as
network harmonics. A reference is developed for offline
prediction and then implemented with the help of back
propagation technique.
Modeling and simulation of dynamic voltage restorer for voltage sag mitigatio...IJRRR
Abstract- Power quality deals with utilization of electric energy from the distribution system successfully without interference or interruption. Various factors like interruption in power supply, under voltage, over voltage, unbalanced voltage or current, harmonic distortion, flickering voltage, voltage fluctuation voltage sag etc. result in poor power quality. These power quality related problems can be solved with the help of various custom power devices. Voltage sags are considered to be the most common type of disturbances in the field based on current power disturbances studies. Their impact on sensitive loads is rigorous. The impact ranges from load disruptions to financial losses. In spite of the technical advances in electronics, there are some pieces of equipment that are so sensitive that they are unable to withstand voltage sags. There are many varies methods to mitigate voltage sags, but a Custom Power Supply device is considered to be the most efficient method. This dissertation is the study of Dynamic Voltage Restorer (DVR) which is the most efficient and effective device to protect sensitive equipment against voltage sags. It has low cost, smaller size and it has dynamic response to the disturbance.
Keywords- Voltage sag, DVR, power system, mitigation
Voltage Sag and Swell Identification Using FFT Analysis and Mitigation with DVRIOSRJEEE
- Power quality issues like voltage sag, swell, harmonics and transients can affect the power system performance. Voltage sag and swell are now-a-days treated to reduce power quality issues by power engineers. A small variation in voltage can badly affect the operation of power system and connected loads as well. This paper presents the voltage sag and voltage swell identification using FFT analysis. The paper also presents the mitigation for identified voltage sag and swells issues addressed with DVR. DVR consists of a voltage source converter and is controlled with d-q theory which is simple producing reference signals and gate pulses for switches of DVR. The proposed concept was simulated using MATLAB/SIMULINK software and results were presented for identification and mitigation. FFT analyses for identification of voltage sags and swell existence in different phases of power system network were shown. Mitigation of voltage sag and swell with DVR was also shown with results
Enhancement of power quality by DVR using "ANN Technique" under unbalanced an...ijceronline
The paper discusses the voltage control of a critical load bus using dynamic voltage restorer (DVR) in a distribution system. The critical load requires a balanced sinusoidal waveform across its terminals preferably at system nominal frequency of 50Hz .It is assumed that the frequency of the supply voltage can be varied and it is different from the system nominal frequency. The DVR is operated such that it holds the voltage across critical load bus terminals constant at system nominal frequency irrespective of the frequency of the source voltage. In case of a frequency mismatch, the total real power requirement of the critical load bus has to be supplied by the DVR. Proposed method used to compensate for frequency variation, the DC link of the DVR is supplied through an uncontrolled rectifier that provides a path for the real power required by the critical load to flow .A simple frequency estimation technique is discussed which are Discrete Fourier transform (DFT), ANN controller. The present work study the compensation principle and different control strategies of DVR used here are based on DFT, and ANN Controller .Through detailed analysis and simulation studies using MATLAB. It is shown that the voltage is completely controlled across the critical load.
Neuro-Fuzzy Five-level Cascaded Multilevel Inverter for Active Power FilterIDES Editor
This paper presents an investigation of five-Level
Cascaded H-bridge(CHB) inverter as Active Power Filter in
Power System (PS) for compensation of reactive power and
harmonics. The advantages of CHB inverter are low harmonic
distortion, reduced number of switches and suppression of
switching losses. The Active Power Filter helps to improve
the power factor and eliminate the Total Harmonics Distortion
(THD) drawn from a Non-Liner Diode Rectifier Load (NLDRL).
The D-Q reference frame theory is used to generate the
reference compensating currents for Active Power Filter
while Neuro-Fuzzy controller(NFC) is used for capacitor dc
voltage regulation. A CHB Inverter is considered for shunt
compensation of a 11 kV distribution system. Finally a level
shifted PWM (LSPWM) technique adopted to investigate the
performance of CHB Inverter. The results are obtained through
Mat lab / Simulink .
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.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.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
International Refereed Journal of Engineering and Science (IRJES)irjes
The core of the vision IRJES is to disseminate new knowledge and technology for the benefit of all, ranging from academic research and professional communities to industry professionals in a range of topics in computer science and engineering. It also provides a place for high-caliber researchers, practitioners and PhD students to present ongoing research and development in these areas.
Simulation and Comparison of DVR and DSTATCOM Used for voltage sag mitigation...paperpublications3
Abstract: Power Quality problem in a system leads to various disturbances such as voltage fluctuations, transients and waveform distortions that results in a mis-operation or a failure of end user equipment. There are different types of custom power devices like Distribution Static Compensator (D-STATCOM) and Dynamic Voltage Restorer (DVR) which can effectively use for mitigation of different type of power quality problems. This paper describes the technique of correcting the supply voltage sag distributed system and also describes performance comparison are presented between DVR and DSTATCOM to know how both the devices successfully been applied to power system for regulating system voltage effectively. DSTATCOM and DVR both of them based on VSI principle. A DVR is a series compensation device which injects a voltage in series with system and a DSTATCOM is a shunt compensation device which injects a current into the system to correct the power quality problems. This paper presents a power system operation with PI controller with abc to dq0 convertor approach. Total Harmonics Distortion (THD) is also calculated for the system with and without compensation. Results are presented to assess the performance of devices as a potential custom power solution. Improve dynamic voltage control and thus increase system load ability. This paper presents modeling and simulation of DVR & DSTATCOM in MATLAB/Simulink.
Field Programmable Gate Array (FPGA) - Based Pulse Width Modulation for Singl...IJSRD
Active filtering of electric power has now become a mature technology for harmonic and reactive power compensation in two-wire (single phase), three-wire (three phase without neutral), and four-wire (three phase with neutral) ac power networks with nonlinear loads. This paper presents the simulations of Field programmable gate array (FPGA) - based single phase hybrid active power filters of two different configurations using Xilinx system generator. The former one with the hybrid combination of series active power filter and shunt passive filter is designed to mitigate the distortions in source voltage and source current due to the voltage source type harmonic load and the latter one with the hybrid combination of shunt active power filter and shunt passive filter is designed to mitigate the harmonics in source current due to the current source type harmonic load.
Soft Switched Multi-Output Flyback Converter with Voltage DoublerIJPEDS-IAES
A novel multi-output voltage doubler circuit with resonant switching
technique is proposed in this paper. The resonant topology in the primary
side of the flyback transformer switches the device either at zero voltage or
current thus optimizing the switching devices by mitigating the losses. The
voltage doubler circuit introduced in the load side increases the voltage by
twice the value thereby increasing the load power and density. The proposed
Multi-output Isolated Converter removes the need for mutiple SMPS units
for a particular application. This reduces the size and weight of the
converters considerably leading to a greater payload. This paper aims at
optimizing the proposed converter with some design changes. The results
obtained from the hardware prototype are given in a comprehensive manner
for a 3.5W converter operating at output voltages of 5V and 3.3V at 50 kHz
switching frequency. The converter output is regulated with the PI controller
designed with SG3523 IC. The effects of load and line regulation for ±20%
variations are analyzed in detail.
Design and Analysis of Adaptive Neural Controller for Voltage Source Converte...IDES Editor
Usually a STATCOM is installed to support power
system networks that have a poor power factor and often poor
voltage regulation. It is based on a power electronics voltagesource
converter. Various PWM techniques make selective
harmonic elimination possible, which effectively control the
harmonic content of voltage source converters. The distribution
systems have to supply unbalanced nonlinear loads transferring
oscillations to the DC-side of the converter in a realistic
operating condition. Thus, additional harmonics are modulated
through the STATCOM at the point of common coupling
(PCC). This requires more attention when switching angles are
calculated offline using the optimal PWM technique. This
paper, therefore, presents the artificial neural network model
for defining the switching criterion of the VSC for the
STATCOM in order to reduce the total harmonic distortion
(THD) of the injected line current at the PCC. The model takes
into the account the dc capacitor effect, effects of other possible
varying parameters such as voltage unbalance as well as
network harmonics. A reference is developed for offline
prediction and then implemented with the help of back
propagation technique.
Modeling and simulation of dynamic voltage restorer for voltage sag mitigatio...IJRRR
Abstract- Power quality deals with utilization of electric energy from the distribution system successfully without interference or interruption. Various factors like interruption in power supply, under voltage, over voltage, unbalanced voltage or current, harmonic distortion, flickering voltage, voltage fluctuation voltage sag etc. result in poor power quality. These power quality related problems can be solved with the help of various custom power devices. Voltage sags are considered to be the most common type of disturbances in the field based on current power disturbances studies. Their impact on sensitive loads is rigorous. The impact ranges from load disruptions to financial losses. In spite of the technical advances in electronics, there are some pieces of equipment that are so sensitive that they are unable to withstand voltage sags. There are many varies methods to mitigate voltage sags, but a Custom Power Supply device is considered to be the most efficient method. This dissertation is the study of Dynamic Voltage Restorer (DVR) which is the most efficient and effective device to protect sensitive equipment against voltage sags. It has low cost, smaller size and it has dynamic response to the disturbance.
Keywords- Voltage sag, DVR, power system, mitigation
Voltage Sag and Swell Identification Using FFT Analysis and Mitigation with DVRIOSRJEEE
- Power quality issues like voltage sag, swell, harmonics and transients can affect the power system performance. Voltage sag and swell are now-a-days treated to reduce power quality issues by power engineers. A small variation in voltage can badly affect the operation of power system and connected loads as well. This paper presents the voltage sag and voltage swell identification using FFT analysis. The paper also presents the mitigation for identified voltage sag and swells issues addressed with DVR. DVR consists of a voltage source converter and is controlled with d-q theory which is simple producing reference signals and gate pulses for switches of DVR. The proposed concept was simulated using MATLAB/SIMULINK software and results were presented for identification and mitigation. FFT analyses for identification of voltage sags and swell existence in different phases of power system network were shown. Mitigation of voltage sag and swell with DVR was also shown with results
Enhancement of power quality by DVR using "ANN Technique" under unbalanced an...ijceronline
The paper discusses the voltage control of a critical load bus using dynamic voltage restorer (DVR) in a distribution system. The critical load requires a balanced sinusoidal waveform across its terminals preferably at system nominal frequency of 50Hz .It is assumed that the frequency of the supply voltage can be varied and it is different from the system nominal frequency. The DVR is operated such that it holds the voltage across critical load bus terminals constant at system nominal frequency irrespective of the frequency of the source voltage. In case of a frequency mismatch, the total real power requirement of the critical load bus has to be supplied by the DVR. Proposed method used to compensate for frequency variation, the DC link of the DVR is supplied through an uncontrolled rectifier that provides a path for the real power required by the critical load to flow .A simple frequency estimation technique is discussed which are Discrete Fourier transform (DFT), ANN controller. The present work study the compensation principle and different control strategies of DVR used here are based on DFT, and ANN Controller .Through detailed analysis and simulation studies using MATLAB. It is shown that the voltage is completely controlled across the critical load.
Neuro-Fuzzy Five-level Cascaded Multilevel Inverter for Active Power FilterIDES Editor
This paper presents an investigation of five-Level
Cascaded H-bridge(CHB) inverter as Active Power Filter in
Power System (PS) for compensation of reactive power and
harmonics. The advantages of CHB inverter are low harmonic
distortion, reduced number of switches and suppression of
switching losses. The Active Power Filter helps to improve
the power factor and eliminate the Total Harmonics Distortion
(THD) drawn from a Non-Liner Diode Rectifier Load (NLDRL).
The D-Q reference frame theory is used to generate the
reference compensating currents for Active Power Filter
while Neuro-Fuzzy controller(NFC) is used for capacitor dc
voltage regulation. A CHB Inverter is considered for shunt
compensation of a 11 kV distribution system. Finally a level
shifted PWM (LSPWM) technique adopted to investigate the
performance of CHB Inverter. The results are obtained through
Mat lab / Simulink .
Utilization of DVR with FLC to Inject Voltage in a Transmission LineIJMER
International Journal of Modern Engineering Research (IJMER) is Peer reviewed, online Journal. It serves as an international archival forum of scholarly research related to engineering and science education.
International Journal of Modern Engineering Research (IJMER) covers all the fields of engineering and science: Electrical Engineering, Mechanical Engineering, Civil Engineering, Chemical Engineering, Computer Engineering, Agricultural Engineering, Aerospace Engineering, Thermodynamics, Structural Engineering, Control Engineering, Robotics, Mechatronics, Fluid Mechanics, Nanotechnology, Simulators, Web-based Learning, Remote Laboratories, Engineering Design Methods, Education Research, Students' Satisfaction and Motivation, Global Projects, and Assessment…. And many more.
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.
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
International Journal of Engineering Research and Applications (IJERA) is a team of researchers not publication services or private publications running the journals for monetary benefits, we are association of scientists and academia who focus only on supporting authors who want to publish their work. The articles published in our journal can be accessed online, all the articles will be archived for real time access.
Our journal system primarily aims to bring out the research talent and the works done by sciaentists, academia, engineers, practitioners, scholars, post graduate students of engineering and science. This journal aims to cover the scientific research in a broader sense and not publishing a niche area of research facilitating researchers from various verticals to publish their papers. It is also aimed to provide a platform for the researchers to publish in a shorter of time, enabling them to continue further All articles published are freely available to scientific researchers in the Government agencies,educators and the general public. We are taking serious efforts to promote our journal across the globe in various ways, we are sure that our journal will act as a scientific platform for all researchers to publish their works online.
This paper gives a systematic technique of the design and simulation of Dynamic Voltage Restorer (DVR) the use of Sinusoidal Pulse Width Modulation (SPWM). though electricity great associated problems like voltage sags/swells arise both at the transmission aspect as well as the distribution facet, the terminology used for the compensation devices is exclusive. DVR is a series linked tool used for compensating voltage sags and swells at the distribution side. on this work, a step by step technique is given to determine out the additives which can be required for the layout and simulation of DVR. The detection of sags/swells is completed with the assist of d-q-o concept, whereas the manager of the voltage source inverter is achieved with the assist of SPWM. The VSI has been applied with the assist of both Bipolar SPWM in addition to Unipolar SPWM and the results were compared. The simulation becomes achieved with the help of SIMULINK & MATLAB and the consequences have been located to be in accordance with concept.
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.
Improving Stability of Utility-Tied Wind Generators using Dynamic Voltage Res...IJMTST Journal
The generation of electricity using wind power is significantly increasing and has received considerable attention in recent years. One important problem with the induction generator based wind farms is that they are vulnerable to voltage disturbances and short circuit faults. Any such disturbance may cause wind farm outages. Since wind power contribution is in considerable percentage, such outages may lead to power system stability issues and also violate the grid code requirements. Thus, improving the reliability of wind farms is essential to maintain the stability of the system. The proposed strategy is to use Dynamic Voltage Restorer (DVR), which is one of the promising devices to compensate the voltage disturbance and to improve the stability of the system. It provides the wind generator with the fault ride through capability and improves the reliability of the system. Fuzzy Logic controller is used as a controller in order to control the dc link voltages and to reduce the harmonics. Simulation results for a 2 MW wind turbine are presented, especially for asymmetrical grid faults. They show the effectiveness of the DVR in comparison to the low voltage ride-through of the DFIG using a crowbar that does not allow continuous reactive power production. Extensive simulation results are included to illustrate the operation of DVR and fault compensation.
Research Inventy : International Journal of Engineering and Scienceresearchinventy
Research Inventy : International Journal of Engineering and Science is published by the group of young academic and industrial researchers with 12 Issues per year. It is an online as well as print version open access journal that provides rapid publication (monthly) of articles in all areas of the subject such as: civil, mechanical, chemical, electronic and computer engineering as well as production and information technology. The Journal welcomes the submission of manuscripts that meet the general criteria of significance and scientific excellence. Papers will be published by rapid process within 20 days after acceptance and peer review process takes only 7 days. All articles published in Research Inventy will be peer-reviewed.
International Journal of Engineering Research and DevelopmentIJERD Editor
• Electrical, Electronics and Computer Engineering,
• Information Engineering and Technology,
• Mechanical, Industrial and Manufacturing Engineering,
• Automation and Mechatronics Engineering,
• Material and Chemical Engineering,
• Civil and Architecture Engineering,
• Biotechnology and Bio Engineering,
• Environmental Engineering,
• Petroleum and Mining Engineering,
• Marine and Agriculture engineering,
• Aerospace Engineering.
Sag mitigation in distribution system by using Dynamic voltage Restorer (DVR)IJERA Editor
Power quality is most important concern in the current age. It’s now a day’s necessary with the refined devices, where performance is very perceptive to the quality of power supply. Power quality crisis is an incidence manifest as a typical voltage, current or frequency that results in a failure of end use equipments. One of the major crises dealt here is the power sag. Perceptive industrial loads and distribution networks suffer from different types of service interruptions and outages which results in a major financial loss. To improve the power quality, custom power-devices are used. The device considered in this work is Dynamic Voltage Restorer. This paper shows modelling, analysis and simulation of a DVR test systems using MATLAB.
I have considered single line to ground fault for linear load. The role of DVR is to “compensate load voltage” is examined during the different fault conditions like voltage sag, single phase to ground faults.
IMPLEMENTATION OF FUZZY CONTROLLED PHOTO VOLTAIC FED DYNAMIC VOLTAGE RESTORER...Wireilla
Power Quality(PQ) has become an area of concern in the electrical distribution system. Dynamic Voltage Restorer(DVR) restores load voltage to a nominal balanced sinusoidal voltage, when the source voltage has harmonic distortions, sag, swell and unbalances. In this paper a Photo Voltaic(PV) fed DVR is proposed to mitigate PQ problems. The PV system can supply the maximum power to the load at a particular operating point known as Maximum Power Point (MPP), at which the entire PV system operates with maximum efficiency. A Fuzzy Controller based MPPT is implemented to generate the optimal voltage from the photovoltaic system by modulating the duty cycle applied to the boost converter. The DVR is implemented using a Fuzzy Logic Controller based voltage source inverter with Photovoltaic system. The test system has been simulated and the efficacy of the proposed PV based Fuzzy controlled DVR is compared with Proportional Integral (PI) controlled DVR.
Implementation of Fuzzy Controlled Photo Voltaic Fed Dynamic Voltage Restorer...ijfls
Power Quality(PQ) has become an area of concern in the electrical distribution system. Dynamic Voltage
Restorer(DVR) restores load voltage to a nominal balanced sinusoidal voltage, when the source voltage
has harmonic distortions, sag, swell and unbalances. In this paper a Photo Voltaic(PV) fed DVR is
proposed to mitigate PQ problems. The PV system can supply the maximum power to the load at a
particular operating point known as Maximum Power Point (MPP), at which the entire PV system operates
with maximum efficiency. A Fuzzy Controller based MPPT is implemented to generate the optimal voltage
from the photovoltaic system by modulating the duty cycle applied to the boost converter. The DVR is
implemented using a Fuzzy Logic Controller based voltage source inverter with Photovoltaic system. The
test system has been simulated and the efficacy of the proposed PV based Fuzzy controlled DVR is
compared with Proportional Integral (PI) controlled DVR.
modeling and simulation of a dynamic voltage restorer
Fm3110901095
1. S.Ezhilarasan, G.Balasubramanian / International Journal of Engineering Research and
Applications (IJERA) ISSN: 2248-9622 www.ijera.com
Vol. 3, Issue 1, January -February 2013, pp.1090-1095
Dynamic Voltage Restorer For Voltage Sag Mitigation Using Pi
With Fuzzy Logic Controller
S.Ezhilarasan*, G.Balasubramanian**
*Research Scholar, Department of Electrical & Electronics Engineering
Periyar Maniammai University, Thanjavur – 613 403, India
**Assistant Professor, Department of Electronics & Communication Engineering
Trichy Engineering College, Tiruchirappalli – 621 132, India
ABSTRACT
This paper deals with terminology and processes. High quality in the power supply is
various issues related to ‘power quality needed, since failures due to such disturbances
problems’. This problem occurs in voltage sags, usually have a high impact on production costs.
swells, harmonics, surges, sustained over voltage There are number of methods to overcome voltage
and under voltage originated from power system sags. One approach is to use Dynamic Voltage
can often damage / or disrupt computerized Restorers with energy storage. The DVR is a power
process. The main occurrence of voltage sag and electronics device that is able to compensate voltage
harmonics disturbed in power quality sags on critical loads dynamically. By injecting an
improvement and overcome by custom power appropriate voltage, the DVR restores a voltage
device called dynamic voltage restorer (DVR). waveform and ensures constant load voltage. The
The DVR normally installed between the source DVR consists of Voltage Source Converter (VSC),
voltage and critical or sensitive load. The vital injection transformers, passive filters and energy
role of DVR depends on the efficiency of the storage (lead acid battery). The Dynamic Voltage
control technique involved in switching circuit of Restorer (DVR) with the lead acid battery is an
the inverter. In this paper, performance attractive way to provide excellent dynamic voltage
improvement of the DVR based PI with Fuzzy compensation capability as well as being
Logic Controller using MATLAB/SIMULINK economical when compared to shunt-connected
software. The performance of the DVR works devices. The DVR is a custom power device that is
well both in balance and unbalance conditions of connected in series with the distribution system. The
voltages. DVR employs MOSFETs to maintain the voltage
Keywords - Dynamic Voltage Restorer, Pulse applied to the load by injecting three-phase output
Width Modulation (PWM), PI with Fuzzy Logic voltages whose magnitude, phase and frequency can
Controller, Voltage Sag, Voltage Source be controlled. [3]
Converter. Control unit is the heart of the DVR where it main
function is to detect the presence of voltage sags in
I. INTRODUCTION the system, calculating the required compensating
Voltage sags are now one of the most voltage for the DVR and generate the reference
important power quality problems in the power voltage for PWM generator to trigger on the PWM
distribution systems. A voltage sag is a momentary inverter. The components of control system unit are
dq0-transformation, Phase-lock-loop (PLL) and the
decrease in rms ac voltage (0.1-0.9 p.u. of the
PI with FL Controller. PI Controller is a feedback
nominal voltage), at the power frequency, of
duration from cycles to a few seconds. Most voltage controller which drives the plant to be controlled
with a weighted sum of the error (difference
sags are caused by remote faults, such as single
between output and and desired set-point) and the
line- to-ground fault, double line to ground fault
and three phase fault on the power distribution integral of that value. [1]
system. [2] A new fuzzy logic (FL) method has been applied to
Recently, power quality problems become a major custom power devices, especially for active power
concern of industries due to massive loss in terms of filters. The operation of DVR is similar to that of
time and money. Hence, there are always demands active power filters in that both compensators must
for good power quality, which positively resulting in respond very fast on the request from abruptly
changing reference signals. In the literature, FL
reduction of power quality problems like voltage control of DVR based on dq synchronous reference
sag, harmonic, flicker, interruptions and harmonic frame (SRF). In three-phase supply voltages are
transformed into d and q coordinates. The reference
distortion. Preventing such phenomena is
values for Vd and Vq are compared with these
particularly important because of the increasing
heavy automation in almost all the industrial transformed values and then voltage errors are
obtained. FL controllers evaluating 9 linguistic rules
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2. S.Ezhilarasan, G.Balasubramanian / International Journal of Engineering Research and
Applications (IJERA) ISSN: 2248-9622 www.ijera.com
Vol. 3, Issue 1, January -February 2013, pp.1090-1095
process these errors. Resulting outputs are re- A. Proportional-Integral (PI) Controller
transformed into three-phase domain and compared
with a carrier signal to generate PWM inverter
signals. [4]
This paper presents the modeling and simulation of
a PI with FLC-based DVR under voltage sag
phenomena. In this case, the PI with fuzzy logic
controller has been incorporated instead of
conventional other controller. The simulation tool
is the MATLAB/Simulink Power System Blockset
(PSB). The capability of DVR to mitigate the Fig. 2: Discrete PI Controller
voltage sag is demonstrated by MATLAB
simulation. The addition of PI with fuzzy logic Discrete PI Controller shown in Fig.2 is a
control to gives added advantage of faster response feedback controller which drives the plant to be
as compared to the conventional one. [5] controlled with a weighted sum of the error and the
integral of that value. The proportional response can
II. BASIC CONCEPTS OF DYNAMIC be adjusted by multiplying the error by constant KP,
VOLTAGE RESTORER called proportional gain.
A DVR is a solid state power electronics The contribution from integral term is proportional
switching device consisting of either MOSFET or to both the magnitude of error and duration of error.
IGBT, a capacitor bank as an energy storage device The error is first multiplied by the integral gain, Ki
and injection transformers. It is linked in series and then was integrated to give an accumulated
between a distribution system and a load that shown offset that have been corrected previously.[7]
in Fig.1. The basic idea of the DVR is to inject a
controlled voltage generated by a forced commuted
converter in a series to the bus voltage by means of
an injecting transformer.
A DC to AC inverter regulates this voltage by
sinusoidal PWM technique. All through normal
operating condition, the DVR injects only a small
voltage to compensate for the voltage drop of the
injection transformer and device losses. However,
when voltage sag occurs in the distribution system,
the DVR control system calculates and synthesizes
the voltage required to preserve output voltage to
the load by injecting a controlled voltage with a Fig. 3: Control circuit using PI with
certain magnitude and phase angle into the fuzzy logic controller
distribution system to the critical load.[9]
Fig.3 shows the control circuit designed in
Matlab/Simulink software. The input of the
controller come from the output voltage, V3
measured by three-phase V-I measurement at Load
in pu. V3 is then transformed in dq term (expressed
as instantaneous space vector). The voltage sag is
detected by measuring the error between the dq-
voltage and the reference values. The d-reference is
set to rated voltage whilst q reference is set to zero.
The dq components of load voltage are compared
with the reference values and the error signal is then
entering to PI controller. Two PI controller block are
used for error signal-d and error signal-q separately.
Fig. 1: Schematic diagram of a typical DVR For error signal-d, KP is set to 40 and Ki is set to 100
whilst for error signal-q, KP is set to 30 and Ki is set
III. PROPOSED DVR CONTROL to 150 respectively. All the gains selected use to
IMPLEMENTATION tune up the error signal d and q so that the signal is
stable and well responses to system disturbances.
The outputs of the PI controller then are transformed
back into Vabc before forwarded to PWM generator.
B. Fuzzy Logic Controller (FLC)
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Applications (IJERA) ISSN: 2248-9622 www.ijera.com
Vol. 3, Issue 1, January -February 2013, pp.1090-1095
Fig. 6: Linguistic variables from delta error
Fig. 4: Basic configuration of FL controller
Unlike Boolean logic, fuzzy logic allows states Fig. 7: Linguistic variables from output signal
(membership values) between 0 or 1. Its major In defuzzyfication process, there are five linguistic
features are the use of linguistic variables rather variables which are Negative Big (NB), Negative
than numerical variables. Linguistic variables, Small (NS), Zero (Z), Positive Big (PB) and
defined as variables whose values are sentences in a Positive Small (PS), Fig.7. Shows each parameter
natural language (such as small and big), may be for output signal.
represented by fuzzy sets [6]. The general structure Table 1: Rule Base
of an FLC is represented in Fig.4 and comprises E DE N Z P
four principal components:
• a fuzzyfication interface which converts input data N NB NS Z
into suitable linguistic values; Z NS Z PS
• a knowledge base which consists of a data base
P Z PS PB
with the necessary linguistic definitions and control
rule set; In the decision-making process, there is rule base
• a decision making logic which, simulating a that linking between input (error signal) and output
human decision process, infers the fuzzy control signal. Table 1 show the rule base used in this FL
action from the knowledge of the control rules and controller.
the linguistic variable definitions; and
• a defuzzyfication interface which yields a
nonfuzzy control action from an inferred fuzzy
control action.
In this paper, two FL controller block are used for
error signal-d and error signal-q as shown in Fig.3.
The process also same as before except the
controller now is Fuzzy Logic. For both blocks
(error signal-d and q) the FL controller consists of
three linguistic variables from input which is;
Negative (N), Zero (Z) and Positive (P). Each
parameter from linguistic variables for error signal
is shown in Fig.5. For delta error, there are three Fig. 8: Rule viewer of d reference
linguistic variables, Negative (N), Zero (Z) and
Positive (P). Both variables can be depicted as in
Fig.6.
Fig. 9: Rule viewer of q reference
Fig. 5: Linguistic variables from error
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4. S.Ezhilarasan, G.Balasubramanian / International Journal of Engineering Research and
Applications (IJERA) ISSN: 2248-9622 www.ijera.com
Vol. 3, Issue 1, January -February 2013, pp.1090-1095
Time (s)
Fig. 12: Normal system (a) Supply voltage, (b)
Injection voltage, and (c) Load voltage
Fig. 10: Surface viewer
IV. SIMULATION RESULTS AND
DISCUSSION Time (s)
In order to understand the performance of the DVR Fig. 13: Single line to ground fault; (a) Supply
along with control, a simple distribution network as voltage, (b) Injection voltage, and (c) Load voltage
shown in Fig.11 is implemented. There are different
fault conditions like normal system, single line to
ground fault, double line to ground fault, three
phase fault and voltage sag simulated using
MATLAB/SIMULINK software. PI with fuzzy
logic controller is used for the control purpose. The
DVR system connected to the distribution system
using a booster transformer.
Time (s)
Fig. 14: Double line to ground fault; (a) Supply
voltage, (b) Injection voltage, and (c) Load voltage
Fig. 11: Simulink Model of DVR Test System
In this system different fault conditions like normal
system, single line to ground fault, double line to
ground fault, three phase fault and voltage sag with
feeder for the duration of 0.25s to 0.35s with fault
resistance is 20 ohms and the ground resistance is
0.001 ohms. The output results for the above system
are shown below.
Time (s)
Fig. 15: Three phase fault; (a) Supply voltage, (b)
Injection voltage, and (c) Load voltage
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5. S.Ezhilarasan, G.Balasubramanian / International Journal of Engineering Research and
Applications (IJERA) ISSN: 2248-9622 www.ijera.com
Vol. 3, Issue 1, January -February 2013, pp.1090-1095
effectiveness in voltage sags compensation showed
by the DVR makes it an interesting power quality
device compared to other custom power devices.
Therefore, when it comes to implementation, it is
crucial to consider these factors, so that the
performance of DVR is optimized.
REFERENCES
[1] R. H. Salimin and M. S. A. Rahim “Simulation
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(PEOCO2011), Shah Alam, Selangor,
Time (s) Malaysia: 6-7 June 2011, pp. 261-266.
Fig. 16: Voltage sag; (a) Supply voltage, (b) [2] Paisan Boonchiaml Promsak Apiratikull and
Injection voltage, and (c) Load voltage Nadarajah Mithulananthan2“Detailed Analysis
of Load Voltage Compensation for Dynamic
Voltage Restorers” IEEE Transactions, 2006.
[3] Omar R and Rahim, N.A. “New Control
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Industrial Electronics and Applications, 2009.
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[4] A. Teke K. Bayindir and M.Tu¨may“Fast
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V. CONCLUSION [8] M.A.Hannan and A Mohamed, “Modeling and
In this paper, the modeling and simulation of DVR Analysis of a 24- Pulse Dynamic Voltage
controlled by PI with Fuzzy Logic Controller has Restorer in a Distribution System”, Student
been developed using Matlab/Simulink. For the Conference on Research and Development
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compensate for voltage sags at the grid side, this can
be proved through simulation. The efficiency and the
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6. S.Ezhilarasan, G.Balasubramanian / International Journal of Engineering Research and
Applications (IJERA) ISSN: 2248-9622 www.ijera.com
Vol. 3, Issue 1, January -February 2013, pp.1090-1095
S. Ezhilarasan, received his B.E degree
from Mookambigai College of Engineering,
Pudukkottai in 2003 and M.E. from
Saranathan College of Engineering
Tiruchirappalli in 2006. He is currently
pursuing his Ph.D. from Periyar
Maniammai University, Thanjavur. His
areas of interest are power electronics and
AC & DC motor drives. Presently he is
working as Assistant Professor in the EEE
Department of Periyar Maniammai
University, Thanjavur.
G.Balasubramanian, received his B.E
degree from Mookambigai College of
Engineering, Pudukkottai in 2009 and M.E
from Roever Engineering College,
Perambalur in 2012. His areas of interest
are power electronics and drives, power
quality improvement and fuzzy logic
controller. Presently he is working as
Assistant Professor in the ECE Department
of Trichy Engineering College, Trichy.
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