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 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.
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 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 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.
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 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.
A Three Phase D-STATCOM to Compensate AC and DC loads by using Fuzzy Logic DC...IJMTST Journal
A Fuzzy Logic control the transient response of the distribution static compensator (D-STATCOM) is very
important while compensating rapidly varying unbalanced and nonlinear loads. Any change in the load
affects the dc-link voltage directly. The sudden removal of load would result in an increase in the dc-link
voltage above the reference value; where as a sudden increase in load would reduce the dc-link voltage
below its reference value. The proper operation of D-STATCOM requires variation of the dc-link voltage within
the prescribed limits. Conventionally, a proportional integral (PI) controller is used to maintain the dc-link
voltage to the reference value. A Fuzzy Logic controls the transient response of the distribution static
compensator (D-STATCOM) is very important while compensating rapidly varying unbalanced and nonlinear
loads. It uses deviation of the capacitor voltage from its reference value as its input. However, the transient
response of the conventional PI dc-link voltage controller is slow. In this paper, a fast-acting dc-link voltage
controller based on the energy of a dc-link capacitor is proposed. Mathematical equations are given to
compute the gains of the conventional controller based on fast-acting dc-link voltage controllers to achieve
similar fast transient response. The detailed simulation and experimental studies are carried out to validate
the proposed controller.
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.
Analysis of Total Harmonic Distortion (THD) Level of Distribution Network Usi...IJERA Editor
The modern sensitive, Non-linear and sophisticated load affects the power quality. Dynamic Voltage Restorer (DVR) provides the fast, flexible and efficient solution to improve the power quality for such distribution network [8]. The active power, reactive power, variation of voltage, flicker, harmonics, and electrical behavior of switching operations are the major source of affecting power quality. The intent of this paper is to demonstrate the improvements obtained with DVR in power system network using MATLAB/SIMULINK. In this paper, an overview of the DVR, its functions, configurations, components, control strategies are reviewed. The Simulation results are presented to illustrate the performance of DVR in Total Harmonic Distortion (THD). The results showed clearly the performance of using DVR in improving THD level.
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.
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
Fuzzy Bang-Bang Control Scheme of USSC for Voltage Sag Mitigation due to Shor...IAES-IJPEDS
Unified series shunt compensator (USSC) has been widely used to mitigate various power quality disturbances in distribution network. The USSC is almost similar to the UPFC, but the only differences are that the UPFC inverters are in shunt series connection and used in transmission systems whereas the USSC inverters are in series-shunt connection and used in distribution systems. USSC, it is possible to compensate a different power quality problem as compared to DSTATCOM and DVR. It is noted that, mitigated load voltage by the DVR is lower than mitigated value obtained by USSC. In other words the USSC can mitigate voltage sag better in compared to DVR and D-STATCOM. Also in case of voltage flicker, unbalance and harmonics elimination it is much effective. Similarly, D-STATCOM is unable to control power flow. It is seen that the proposed USSC can mitigate variety of power quality (PQ) problems. Hence due to multi capability of USSC in power quality improvement, this paper presents the scheme based on fuzzy bang-bang control for USSC. Using Fuzzy Logic Control (FLC) based on bang-bang control; the USSC will contribute to improve voltage sag without deteriorating the effect of the other compensating devices.
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.
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.
This paper presents the application of modular multilevel converter (MMC) as a static compensator (STATCOM) for reactive current control. The current control is mostly achieved using proportional controller, proportional-integral (PI) controller, and hysteresis controller among others. PI controllers have the advantage of low harmonics and small variations. However, due to the PI controller’s dependency on the system parameters and also due to the variations within the MMC during capacitors voltage control, variation in the MMC performance during the STATCOM non-ideal operations occur. To mitigate this, an improved performance of MMC will be presented using vector-based compensation concept. The proposed control will be introduced to depress the effect of the dynamics of the MMC based STATCOM non-ideal variations considering the impact of the voltage disturbance. This will be achieved by the introduction of voltage variables to subtract the transient variations from PI controllers’ outputs at the grid-interface; thus, improving the performance.
A Three Phase D-STATCOM to Compensate AC and DC loads by using Fuzzy Logic DC...IJMTST Journal
A Fuzzy Logic control the transient response of the distribution static compensator (D-STATCOM) is very
important while compensating rapidly varying unbalanced and nonlinear loads. Any change in the load
affects the dc-link voltage directly. The sudden removal of load would result in an increase in the dc-link
voltage above the reference value; where as a sudden increase in load would reduce the dc-link voltage
below its reference value. The proper operation of D-STATCOM requires variation of the dc-link voltage within
the prescribed limits. Conventionally, a proportional integral (PI) controller is used to maintain the dc-link
voltage to the reference value. A Fuzzy Logic controls the transient response of the distribution static
compensator (D-STATCOM) is very important while compensating rapidly varying unbalanced and nonlinear
loads. It uses deviation of the capacitor voltage from its reference value as its input. However, the transient
response of the conventional PI dc-link voltage controller is slow. In this paper, a fast-acting dc-link voltage
controller based on the energy of a dc-link capacitor is proposed. Mathematical equations are given to
compute the gains of the conventional controller based on fast-acting dc-link voltage controllers to achieve
similar fast transient response. The detailed simulation and experimental studies are carried out to validate
the proposed controller.
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.
Analysis of Total Harmonic Distortion (THD) Level of Distribution Network Usi...IJERA Editor
The modern sensitive, Non-linear and sophisticated load affects the power quality. Dynamic Voltage Restorer (DVR) provides the fast, flexible and efficient solution to improve the power quality for such distribution network [8]. The active power, reactive power, variation of voltage, flicker, harmonics, and electrical behavior of switching operations are the major source of affecting power quality. The intent of this paper is to demonstrate the improvements obtained with DVR in power system network using MATLAB/SIMULINK. In this paper, an overview of the DVR, its functions, configurations, components, control strategies are reviewed. The Simulation results are presented to illustrate the performance of DVR in Total Harmonic Distortion (THD). The results showed clearly the performance of using DVR in improving THD level.
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.
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
Fuzzy Bang-Bang Control Scheme of USSC for Voltage Sag Mitigation due to Shor...IAES-IJPEDS
Unified series shunt compensator (USSC) has been widely used to mitigate various power quality disturbances in distribution network. The USSC is almost similar to the UPFC, but the only differences are that the UPFC inverters are in shunt series connection and used in transmission systems whereas the USSC inverters are in series-shunt connection and used in distribution systems. USSC, it is possible to compensate a different power quality problem as compared to DSTATCOM and DVR. It is noted that, mitigated load voltage by the DVR is lower than mitigated value obtained by USSC. In other words the USSC can mitigate voltage sag better in compared to DVR and D-STATCOM. Also in case of voltage flicker, unbalance and harmonics elimination it is much effective. Similarly, D-STATCOM is unable to control power flow. It is seen that the proposed USSC can mitigate variety of power quality (PQ) problems. Hence due to multi capability of USSC in power quality improvement, this paper presents the scheme based on fuzzy bang-bang control for USSC. Using Fuzzy Logic Control (FLC) based on bang-bang control; the USSC will contribute to improve voltage sag without deteriorating the effect of the other compensating devices.
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.
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.
This paper presents the application of modular multilevel converter (MMC) as a static compensator (STATCOM) for reactive current control. The current control is mostly achieved using proportional controller, proportional-integral (PI) controller, and hysteresis controller among others. PI controllers have the advantage of low harmonics and small variations. However, due to the PI controller’s dependency on the system parameters and also due to the variations within the MMC during capacitors voltage control, variation in the MMC performance during the STATCOM non-ideal operations occur. To mitigate this, an improved performance of MMC will be presented using vector-based compensation concept. The proposed control will be introduced to depress the effect of the dynamics of the MMC based STATCOM non-ideal variations considering the impact of the voltage disturbance. This will be achieved by the introduction of voltage variables to subtract the transient variations from PI controllers’ outputs at the grid-interface; thus, improving the performance.
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
A Versatile Control Scheme For Dynamic Voltage Restorer To Limit Downstream F...IJERA Editor
The Dynamic Voltage Restorer (DVR) is a custom power device utilized to counteract voltage sags. It injects
controlled three-phase ac voltages in series with the supply voltage, subsequent to voltage sag, to enhance
voltage quality by adjusting the voltage magnitude, wave shape, and phase angle. The DVR is conventionally
bypassed during a downstream fault to prevent potential adverse impacts on the fault and to protect the DVR
components against the fault current. This paper proposes an augmented control strategy for the DVR that
provides:1) voltage-sag compensation under balanced and unbalanced conditions and 2) a fault current
interruption (FCI) function. This paper introduces and evaluates an auxiliary control strategy for downstream
fault current interruption in a radial distribution line by means of a dynamic voltage restorer (DVR). The
proposed controller supplements the voltage-sag compensation control of the DVR. It does not require phaselocked
loop and independently controls the magnitude and phase angle of the injected voltage for each phase.
Fast least error squares digital filters are used to estimate the magnitude and phase of the measured voltages and
effectively reduce the impacts of noise, harmonics, and disturbances on the estimated phasor parameters, and
this enables effective fault current interrupting even under arcing fault conditions. The performance of the DVR
for fault current interruption is analyzed by using MATLAB/SIMULINK software.
Power Quality Enhancement through Dynamic Voltage Restorer using SRF Theory f...IJERD Editor
Power quality is certainly a major concern in the present era, it becomes especially important with
the introduction of sophisticated devices, whose performance is very sensitive to the quality of power supply.
Voltage sag is one of the severe power quality problems. This report addresses all the different aspects related to
voltage sag problem, such as its types, consequences and mitigation.
At present, a wide range of very flexible controllers, which capitalize on newly available power electronics
components, are emerging for custom power applications. Among these, the distribution static compensator (DSTATCOM)
and the dynamic voltage restorer (DVR) are most effective devices, both of them based on the
VSC principle.
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.
Compensation of Sag and Swell Voltage by using Dynamic Voltage Restorerijtsrd
The increase use of modern sensitive and sophisticated loads connected to distribution system causes various problems to the system. The major problems are voltage sag and swell, there is need to compensate it .Today most of the distribution companies are using power semiconductor based devices for improving power quality. Among the various custom power devices, Dynamic voltage restorer is used for compensation in this paper, which is most popular and widely used method. Here, in phase compensation technique of DVR is used with battery energy storage system. The DVR's life time is improved by replacing battery with super capacitor. Super capacitor are most suitable short duration energy requirement. The control technique employed here is SRF controller. The overall work is carried out in MATLAB Simulink. Diksha Wasnik | Prof Radharaman Shaha | Pratik Ghutke ""Compensation of Sag and Swell Voltage by using Dynamic Voltage Restorer"" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-4 , June 2019, URL: https://www.ijtsrd.com/papers/ijtsrd23740.pdf
Paper URL: https://www.ijtsrd.com/engineering/electrical-engineering/23740/compensation-of-sag-and-swell-voltage-by-using-dynamic-voltage-restorer/diksha-wasnik
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
Dynamic voltage restorer (DVR) is a device that can compensate harmonic, voltage sag and voltage swell condition that exists in a three-phase system. Other than that, DVR can also be used to enhance the energy efficiency or energy saving by reducing excessive amount of incoming power via the reduction incoming voltage at allowable limit. The DVR can inject the required voltage in the system so that the interruption of supply voltage can be compensated. The compensation of voltage supply interruption is improved based on the hysteresis voltage output of controller used in the DVR to detect the difference between reference voltage and disrupted voltage. The hysteresis voltage control mainly controlled by relays switching so that the signal can be sent to IGBT switches controller. The hysteresis voltage control and unipolar SPWM is supplied to control the IGBT switches by the DC supply for voltage interruption compensation. The unipolar SPWM technique converts the DC supply voltage into AC supplied voltage, thus making the DVR injection become easier to inject the AC voltage into the system to compensate voltage sag and voltage swell.
The International Journal of Engineering and Science (The IJES)theijes
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.
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.
DVR with Artificial Intelligent Controller for Voltage Sag MitigationMohamed Khaleeel
This paper concludes that DVR is an effective device to compensate the voltage sag in power distribution systems. In term of DVR applications, although Mamdani-type and Sugeno-type share the same functions and rules, there are some distinctions between them.
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.
Compensation of Single-Phase and Three-Phase Voltage Sag and Swell Using Dyna...IJAPEJOURNAL
DVR is a equipment which was connected in series and adjusting the loading voltage by feeding the voltage in system. The first installation was in 1996. usually DVR installed between sensitive loads feeder and source in distribution system .The main duty, fast support load voltage (by fast detection algorithm) during disturbance to avoid any disconnection. in this paper approaches to compensate for voltage sag and swell as a common disturbance in voltage transmission and distribution networks is presented. A dynamic voltage restorer based on the dq0 algorithm for three-phase and dynamic voltage restorer based on the average detection method for single-phase are discussed, also in this paper we compare the two methods used to compensate the single-phase and three-phase process. result of three-phase and single-phase voltage sag and swell simulation has been presented by MATLAB/SIMULINK.
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.
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1. Salava V Satyanarayana et al Int. Journal of Engineering Research and Applications www.ijera.com
ISSN : 2248-9622, Vol. 4, Issue 1( Version 1), January 2014, pp.312-317
RESEARCH ARTICLE
OPEN ACCESS
Emergency Control Using Multifunctional DVR for Distribution
Systems
Salava V Satyanarayana1, A Tejasri M.Tech2
M.TECH Scholar, Dept of EEE, GIET College Rajahmundry, AP
Assistant Professor, Dept. of EEE, GIET College Rajahmundry, AP India
Abstract
This paper discusses a new multifunctional dynamic voltage restorer (DVR) and closed loop controller using the
Posicast and P+Resonant controllers. The closed loop controller using the Posicast and P+Resonant controllers
is proposed in order to improve the transient response and eliminate the steady-state error in DVR response,
respectively. The proposed algorithm is applied to some disturbances in load voltage caused by induction
motors starting, and a three-phase short circuit fault. Also, the capability of the proposed DVR has been tested to
limit the downstream fault current. The current limitation will restore the point of common coupling (PCC) (the
bus to which all feeders under study are connected) voltage and protect the DVR itself. The innovation here is
that the DVR acts as virtual impedance with the main aim of protecting the PCC voltage during downstream
fault without any problem in real power injection into the DVR. Results of the simulation studies in the
MATLAB/SIMULINK software environment indicate that the proposed control scheme with faults and
induction motor under multifunctional DVR.
I.
Introduction
Electric power quality is capacity of an
electric power system to supply electric energy of a
load in an acceptable quality. Power distribution
system should provide with an uninterrupted flow of
energy at smooth sinusoidal voltage at the contracted
magnitude level and frequency to their customers.
Power systems especially distribution systems, have
numerous non linear loads, which significantly affect
the quality of power. Apart from non linear loads like
capacitor switching, motor starting and unusual faults
could also inflict power quality problems. Many
problems can result from poor power quality (PQ),
especially in today’s complex power system, such as
the false operation of modern control systems.
Voltage sag is an important PQ problem because of
sensitive loads growth. Worldwide experience has
showed that short circuit faults are the main origin of
voltage sag; therefore there is a loss of voltage quality
[1]-[2].
Voltage sag is defined as a sudden reduction
in supply voltage to between 90% and 10% of the
nominal value, followed by a recovery after a short
interval (the standard duration of sag is between 10
milliseconds and 1 minute). The most common
compensator for voltage sag is the dynamic voltage
restorer (DVR). The basic operation of the DVR is
based on injection of a compensation voltage with
required magnitude, phase angle and frequency in
series with the sensitive electric distribution feeder.
Previous works have been done on different
aspects of DVR performance, and different control
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strategies have been found. These methods mostly
depend on the purpose of using DVR. In some
methods, the main purpose is to detect and
compensate for the voltage sag with minimum DVR
active power injection [4], [5]. Also, the in-phase
compensation method can be used for sag and swell
mitigation [6]. The multiline DVR can be used for
eliminating the battery in the DVR structure and
controlling more than one line [7], [14]. Moreover,
research has been made on using the DVR in medium
level voltage [8]. Harmonic mitigation [9] and control
of DVR under frequency variation [10] are also in the
area of research. The closed-loop control with load
voltage and current feedback is introduced as a simple
method to control the DVR in [15]. Also, Posicast and
P+Resonant controllers can be used to improve the
transient response and eliminate the steady-state error
in DVR. The Posicast controller is a kind of step
function with two parts and is used to improve the
damping of the transient oscillations initiated at the
start instant from the voltage sag. The P+Resonant
controller consists of a proportional function plus a
resonant function and it eliminates the steady-state
voltage tracking error [6]. The state feed forward and
feedback methods [7], symmetrical components
estimation [8], robust control [10], and wavelet
transform [12] have also been proposed as different
methods of controlling the DVR.
The basis of the proposed control strategy in
this paper is that when the fault current does not pass
through the DVR, an outer feedback loop of the load
voltage with an inner feedback loop of the filter
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ISSN : 2248-9622, Vol. 4, Issue 1( Version 1), January 2014, pp.312-317
capacitor current will be used. Also, a feed forward
loop will be used to improve the dynamic response of
the load voltage. Moreover, to improve the transient
response, the Posicast controller and to eliminate the
steady-state error, the P+Resonant controller are used.
But in case the fault current passes through the DVR,
using the flux control algorithm [11], the series
voltage is injected in the opposite direction and,
therefore, the DVR acts like series variable
impedance.
II.
disturbance compensation process. In particular, if
capacitors are used as energy storage, the DC-link
voltage will decrease with the dwindling storage
energy during compensation.
Dynamic Voltage Restorer
Dynamic voltage restorer was originally
proposed to compensate for voltage disturbances on
distribution systems. A typical DVR scheme is shown
in Fig. 1. The restoration is based on injecting AC
voltages in series with the incoming three-phase
network, the purpose of which is to improve voltage
quality by adjustment in voltage magnitude, waveshape, and phase shift. As shown in Fig. 1, the DVR
essentially consists of a series-connected injection
transformer Ti, a voltage-source inverter (VSI), a
harmonic filter, and an energy storage device [4],
[13]. Meanwhile, a parallel switch is used to bypass
and protect the DVR, when a downstream fault is
detected [14], [15]. As shown in Fig. 1, the line-side
harmonic filter topology [11] consists of the leakage
inductance of the injection transformer and the filter
capacitor. Meanwhile, denotes the dc-link capacitor.
The series injected voltage of the DVR,
Vdvr, is synthesized by modulating pulse widths of
the inverter-bridge switches. The injection of an
appropriate Vdvr in the face of an up-stream voltage
disturbance requires a certain amount of real and
reactive power supply from the DVR. The reactive
power requirement is generated by the inverter.
Fig. 2; Vector Diagram of Voltage Injection Method
The
corresponding
phasor
diagram
describing the electrical conditions during voltage sag
is depicted, where only the affected phase is shown
for clarity. Let the voltage quantities Il, φ, δ and α
represent the load current, load power factor angle,
supply voltage phase angle and load voltage advance
angle respectively. Although there is a phase
advancement of α in the load voltage with respect to
the pre-sag voltage in Fig. 2, only in-phase
compensation where the injected voltage is in phase
with the supply voltage (α = δ) is considered.
By mounting the battery in DC link of the
centralized inverter, the DC/DC converter for battery
can be saved as shown in Figure 1(b) [1], [2].
Different from the centralized inverters in Figure 1(a)
and (b), the separate grid inverters are used by the two
PV systems in Figure 1(c). Thus, the power rating of
each inverter becomes smaller, and the inverter is
intended to be modular design as well as mass
production.
III.
Fig. 1: schematic diagram of the DVR with line side
harmonic filter
Proposed Multifunctional DVR
In addition to the aforementioned
capabilities of DVR, it can be used in the mediumvoltage level as in Fig. 2 to protect a group of
consumers when the cause of disturbance is in the
downstream of the DVR’s feeder and the large fault
current passes through the DVR itself. In this case,
the equipment can limit the fault current and protect
the loads in parallel feeders until the breaker works
and disconnects the faulted feeder.
Widely used in present DVR control is the
so-called in phase voltage injection technique where
the load voltage V2 is assumed to be in-phase with
the pre-sag voltage. As the DVR is required to inject
active power into the distribution line during the
period of compensation, the capacity of the energy
storage unit can become a limiting factor in the
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Fig. 2: A multifunctional DVR connected in a
medium-voltage level power system.
The large fault current will cause the PCC
voltage to drop and the loads on the other feeders
connected to this bus will be affected. Furthermore, if
not controlled properly, the DVR might also
contribute to this PCC voltage sag in the process of
compensating the missing voltage, hence further
worsening the fault situation [11].
To limit the fault current, a flux-charge
model has been proposed and used to make DVR act
like a pure virtual inductance which does not take any
real power from the external system and, therefore,
protects the dc-link capacitor and battery as shown in
Fig. 1 [11]. But in this model, the value of the virtual
inductance of DVR is a fixed one and the reference of
the control loop is the flux of the injection
transformer winding, and the PCC voltage is not
mentioned in the control loop. In this paper, the PCC
voltage is used as the main reference signal and the
DVR acts like variable impedance. For this reason,
the absorption of real power is harmful for the battery
and dc-link capacitor. To solve this problem,
impedance including a resistance and an inductance
will be connected in parallel with the dc-link
capacitor. This capacitor will be separated from the
circuit, and the battery will be connected in series
with a diode just when the downstream fault occurs so
that the power does not enter the battery and the dclink capacitor. It should be noted here that the
inductance is used mainly to prevent large oscillations
in the current. The active power mentioned is,
therefore, absorbed by the impedance.
3.1 Proposed control scheme for using Flux charge
model
In this part, an algorithm is proposed for the
DVR to restore the PCC voltage, limit the fault
current, and, therefore, protect the DVR components.
The flux-charge model here is used in a way so that
the DVR acts as a virtual inductance with a variable
value in series with the distribution feeder. To do this,
the DVR must be controlled in a way to inject a
proper voltage having the opposite polarity with
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respect to usual cases. It should be noted that over
current tripping is not possible in this case, unless
additional communication between the DVR and the
downstream side over current circuit breaker (CB) is
available. If it is necessary operate the over current
CB at PCC, communication between the DVR and the
PCC breaker might have to be made and this can be
easily done by sending a signal to the breaker when
the DVR is in the fault-current limiting mode as the
DVR is just located after PCC [11]. The proposed
DVR control method is illustrated in Fig. 8. It should
also be noted that the reference flux (𝜙 𝑟𝑒𝑓 ) is derived
by integration of the subtraction of the PCC reference
voltage (𝑉 ∗ ) and the DVR load-side voltage. This
𝑃𝐶𝐶
control strategy, the control variable used for the
outer flux model is the inverter-filtered terminal flux
defined as:
(1)
Where 𝑉 𝑜𝑑𝑣𝑟 is the filter capacitor voltage of the DVR
(at the DVR power converter side of the injection
transformer). The flux error is then fed to the flux
regulator, which is a P+Resonant controller, with a
transfer function given in (1). On the other hand, it
can be shown that a single flux-model would not
damp out the resonant peak of the LC filter connected
to the output of the inverter.
Fig. 3: Proposed method.
To stabilize the system, an inner charge
model is therefore considered. In this loop, the filter
inductor charge, which is derived by integration of its
current, tracks the reference charge output of the flux
regulator. The calculated charge error is then fed to
the charge regulator with the transfer function
This is actually a practical form of the
derivative controller. In this transfer function, the
regulator gain is limited to N at high frequencies to
prevent noise amplification. The derivative term in
𝑆 + 𝑆 neutralizes the effects of voltage and
1
𝑁
current integrations at the inputs of the flux-charge
model, resulting in the proposed algorithm having the
same regulation performance as the multiloop
voltage-current feedback control, with the only
difference being the presence of an additional low–
pass filter in the flux control loop in the form of
1 + 𝑆 . The bandwidth of this low–pass filter is
𝑆
𝑁
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tuned (through varying N) with consideration for
measurement noise attenuation, DVR LC-filter
transient resonance attenuation, and system stability
margins.
4.1 Fault Current Limiting
Fig. 4: Multi-loop control using the Posicast and
P+Resonant controller
Theoretically, the resonant controller
compensates by introducing an infinite gain at the
resonant frequency of 50 Hz to force the steady-state
voltage error to zero. The ideal resonant controller,
however, acts like a network with an infinite quality
factor, which is not realizable in practice. A more
practical (nonideal) compensator is therefore used
here, and is expressed as
Where 𝑤 𝑐𝑢𝑡 is the compensator cutoff frequency
which is 1 rad/s in this application.
Fig. 5: Open loop control using the Posicast controller
To improve the damping, as shown in Fig. 4,
the Posicast controller can be used just before
transferring the signal to the PWM inverter of the
DVR. The transfer function of the controller can be
described as follows:
Where 𝛿 and 𝑇 𝑑 are the step response overshoot and
the period of damped response signal, respectively. It
should be noted that the Posicast controller has
limited high-frequency gain; hence, low sensitivity to
noise.
IV.
Fig. 6: SIMULINK Model of Proposed a
Multifunctional DVR under Three Phase Fault
condition.
MATLAB/simulink model of proposed
multifunctional DVR under three phase fault in
figure.6; The last simulation is run for a symmetrical
downstream fault, and the capability of the DVR to
reduce the fault current and restore the PCC voltage is
tested.
For the simulation with DVR compensation,
the three-phase fault is applied at t = 205 ms and then
removed after 0.1 s. Also, a breaker will remove the
faulted bus from the entire system at t = 300 ms. Fig.
13 shows the DVR operation during the fault. As can
be seen, the rms load bus voltage reaches zero during
the fault, and as the enlarged figure shows, in about
half a cycle, the
DVR has succeeded in restoring the PCC
voltage wave shape to the normal condition. It should
be noted that the amount and shape of the oscillations
depend on the time of applying the fault. As Fig. 13
shows, at this time, the voltage value of phase B is
nearly zero; this
MATLAB/Simulink modelling and
results
In this section, the proposed DVR topology
and control algorithm will be used for emergency
control during the voltage sag. The three-phase short
circuit and the start of a three-phase large induction
motor will be considered as the cause of distortion in
the simulations.
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Fig. 8: SIMULINK model of proposed a
multifunctional DVR with Induction Motor.
During this period, the PCC bus is under
voltage sag. From t = 1.4 s, as the speed approaches
nominal, the voltage also approaches the normal
condition. However, during all of these events, the
DVR keeps the load bus voltage at the normal
condition. The DVR has succeeded in restoring the
load voltage in half a cycle from the instant of the
motor starting.
Fig. 7: Fault current limiting by DVR. (a) Threephase PCC voltages. (b) Three-phase load voltages.
(c) RMS voltages of the PCC and load. (d) Threephase currents.
4.2 Induction Motor
The large motor starting current will cause
the PCC voltage to drop. The simulation results in the
case of using the DVR are shown in Fig. 9. In this
simulation, the motor is started at t = 405 ms. As can
be seen in Fig. 11, at this time, the PCC rms voltage
drops to about 0.8 p.u. The motor speed reaches the
nominal value in about 1 s. MATLAB/simlink model
of proposed multifunctional DVR with induction
motor in figure8;
Fig. 9: Starting of an induction motor and the DVR
compensation. (a) Three phase PCC voltages. (b)
Three-phase load voltages. (c) RMS voltages of PCC
and load.
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ISSN : 2248-9622, Vol. 4, Issue 1( Version 1), January 2014, pp.312-317
V.
CONCLUSION
In this paper, a multifunctional DVR is
proposed, and a closed-loop control system is used for
its control to improve the damping of the DVR
response. Also, for further improving the transient
response and eliminating the steady-state error, the
Posicast and P+Resonant controllers are used. As the
second function of this DVR, using the flux-charge
model, the equipment is controlled so that it limits the
downstream fault currents and protects the PCC
voltage during these faults by acting as variable
impedance. The problem of absorbed active power is
solved by entering impedance just at the start of this
kind of fault in parallel with the dc-link capacitor and
the battery being connected in series with a diode so
that the power does not enter it. The simulation
results verify the effectiveness and capability of the
proposed DVR in compensating for the voltage sags
caused by short circuits and the large induction motor
starting and limiting the downstream fault currents
and protecting the PCC voltage.
[8]
[9]
[10]
[11]
[12]
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