1) The document describes the performance of a Dynamic Voltage Restorer (DVR) under various fault conditions in an electrical distribution system.
2) A DVR is connected in series with the distribution network to inject voltage and compensate for voltage sags and swells, maintaining the load voltage at its nominal value.
3) Simulation results using MATLAB/Simulink show that the DVR is able to effectively compensate for voltage disturbances caused by single line-to-ground faults, double line-to-ground faults, line-to-line faults, and three-phase faults, keeping the load voltage stable at its desired level.
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.
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.
Voltage sag mitigation using supercapacitor based dynamic voltage restorereSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
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.
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.
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.
Voltage sag mitigation using supercapacitor based dynamic voltage restorereSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
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.
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.
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.
Comparison of Dynamic Stability Response of A SMIB with PI and Fuzzy Controll...ijeei-iaes
Consumer utilities are non –linear in nature. This injects increased flow of current and reduced voltage with distortions which cause adverse effect on the stability of consumer utilities. To overcome this problem we are using a modern Flexible Alternating Current Transmission System controller i.e. distributed power flow controller (DPFC). This controller is similar to UPFC, which can be installed in a transmission line between the two electrical areas. In DPFC, instead of the common Dc link capacitor three single phase converters are used. In this paper we are concentrating on system stability (oscillation damping). For analyzing the stability of a single machine infinite bus system (SMIB) we have used PI controlled Distributed Power Flow Controller (DPFC) and Fuzzy controlled DPFC. All these models are simulated using MATLAB/SIMULINK. Simulation results shows Fuzzy controlled DPFC are better than PI controlled DPFC. The significance of the results are better stability and constant power supply.
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.
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.
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 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.
Modeling Analysis& Solution of Power Quality Problems Using DVR & DSTATCOMijsrd.com
A Power quality problem is an occurrence manifested as a nonstandard voltage, current or frequency that results in a failure or a disoperation of end use equipment. Utility distribution networks, sensitive industrial loads, and critical commercial operations all suffer from various types of outages and service interruptions which can cost significant financial loss per incident based on process down-time, lost production, idle work forces, and other factors. With the restructuring of Power Systems and with shifting trend towards Distributed and Dispersed Generation, the issue of Power Quality is going to take newer dimensions. The aim therefore, in this work, is to identify the prominent concerns in the area and thereby to recommend measures that can enhance the quality of the power, keeping in mind their economic viability and technical repercussions. In this paper electromagnetic transient studies are presented for the following two custom power controllers: the distribution static compensator (DSTATCOM), and the dynamic voltage restorer (DVR). Comprehensive results are presented to assess the performance of each device as a potential custom power solution.
This paper studies the suitability of a vector based current control which is mostly employed for its faster response in the reactive current applications of static compnesators (STATCOMs). The current control is mostly achieved using proportional-integral (PI) controllers because of the advantage of their good tracking and small variations. However, due to the dependency of PI controllers on the modular multilevel converter (MMC) system dynamics, performance variations arise during steady-state STATCOM non-ideal operations. This paper presents an improved MMC based STATCOM control with a d-q compensation algorithm added to the vector based current control. The algorithm is derived to tackle the effects of the dynamics of the MMC and the STATCOM ideal variations without the use of any additional controller. The control is achieved by providing a power compensation in the d,q-axis which injects currents at the input of the PI controllers in order to improve the steady-state performance of the STATCOM control.
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.
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.
Comparison of Dynamic Stability Response of A SMIB with PI and Fuzzy Controll...ijeei-iaes
Consumer utilities are non –linear in nature. This injects increased flow of current and reduced voltage with distortions which cause adverse effect on the stability of consumer utilities. To overcome this problem we are using a modern Flexible Alternating Current Transmission System controller i.e. distributed power flow controller (DPFC). This controller is similar to UPFC, which can be installed in a transmission line between the two electrical areas. In DPFC, instead of the common Dc link capacitor three single phase converters are used. In this paper we are concentrating on system stability (oscillation damping). For analyzing the stability of a single machine infinite bus system (SMIB) we have used PI controlled Distributed Power Flow Controller (DPFC) and Fuzzy controlled DPFC. All these models are simulated using MATLAB/SIMULINK. Simulation results shows Fuzzy controlled DPFC are better than PI controlled DPFC. The significance of the results are better stability and constant power supply.
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.
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.
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 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.
Modeling Analysis& Solution of Power Quality Problems Using DVR & DSTATCOMijsrd.com
A Power quality problem is an occurrence manifested as a nonstandard voltage, current or frequency that results in a failure or a disoperation of end use equipment. Utility distribution networks, sensitive industrial loads, and critical commercial operations all suffer from various types of outages and service interruptions which can cost significant financial loss per incident based on process down-time, lost production, idle work forces, and other factors. With the restructuring of Power Systems and with shifting trend towards Distributed and Dispersed Generation, the issue of Power Quality is going to take newer dimensions. The aim therefore, in this work, is to identify the prominent concerns in the area and thereby to recommend measures that can enhance the quality of the power, keeping in mind their economic viability and technical repercussions. In this paper electromagnetic transient studies are presented for the following two custom power controllers: the distribution static compensator (DSTATCOM), and the dynamic voltage restorer (DVR). Comprehensive results are presented to assess the performance of each device as a potential custom power solution.
This paper studies the suitability of a vector based current control which is mostly employed for its faster response in the reactive current applications of static compnesators (STATCOMs). The current control is mostly achieved using proportional-integral (PI) controllers because of the advantage of their good tracking and small variations. However, due to the dependency of PI controllers on the modular multilevel converter (MMC) system dynamics, performance variations arise during steady-state STATCOM non-ideal operations. This paper presents an improved MMC based STATCOM control with a d-q compensation algorithm added to the vector based current control. The algorithm is derived to tackle the effects of the dynamics of the MMC and the STATCOM ideal variations without the use of any additional controller. The control is achieved by providing a power compensation in the d,q-axis which injects currents at the input of the PI controllers in order to improve the steady-state performance of the STATCOM control.
IOSR Journal of Applied Chemistry (IOSR-JAC) is an open access international journal that provides rapid publication (within a month) of articles in all areas of applied chemistry and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications in Chemical Science. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
IOSR Journal of Applied Chemistry (IOSR-JAC) is an open access international journal that provides rapid publication (within a month) of articles in all areas of applied chemistry and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications in Chemical Science. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
Optimization Technique for Power Quality Improvement using DSTATCOM Neural Ne...ijtsrd
As the power demand has been increasing rapidly, power generation and transmission are being affected due to limited resources, environmental restrictions and other losses. soft computing the techniques of correcting the supply voltage sag, swell and interruption in a distributed system. At present, a wide range of very flexible controllers, which capitalize on newly available power electronics components, are emerging for custom power applications. Power electronic based equipment aimed at enhancing the reliability and quality of power flows in low voltage distribution networks. A control algorithm is used for the extraction of the fundamental weighted value of active and reactive power components. Using digital signal processor the DSTATCOM is developed and its performance of DSTATCOM is found to be satisfactory for various types of loads. Hareram Mishra | Manju Gupta | Dr. Anuprita Mishra "Optimization Technique for Power Quality Improvement using DSTATCOM (Neural Network Approach) – A Review" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-5 | Issue-5 , August 2021, URL: https://www.ijtsrd.com/papers/ijtsrd45219.pdf Paper URL: https://www.ijtsrd.com/engineering/other/45219/optimization-technique-for-power-quality-improvement-using-dstatcom-neural-network-approach- – -a-review/hareram-mishra
A Review on Optimization Techniques for Power Quality Improvement using DSTAT...ijtsrd
As demand for electricity has risen exponentially, power production and transmission are affected by scarce energy, environmental constraints and other losses. Soft computing methods to fix the sag, swell and disruption of the supply voltage in the distributed device. At present, a broad variety of highly versatile controls that leverage on newly available power electronics components are evolving for custom power applications. Control electronic equipment intended to improve the stability and efficiency of electricity flows in low voltage distribution networks. The control algorithm is used to derive the fundamental weighted value of the active and reactive power components. Using a digital signal processor, DSTATCOM is built and its output as a DSTATCOM is found to be satisfactory for different types of loads. Amit Radhakrishna Parhad | Pramod Kumar Rathore "A Review on Optimization Techniques for Power Quality Improvement using DSTATCOM (Neural Network Approach)" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-5 | Issue-4 , June 2021, URL: https://www.ijtsrd.compapers/ijtsrd42403.pdf Paper URL: https://www.ijtsrd.comengineering/electrical-engineering/42403/a-review-on-optimization-techniques-for-power-quality-improvement-using-dstatcom-neural-network-approach/amit-radhakrishna-parhad
SRF CONTROLLED DVR FOR COMPENSATION OF BALANCED AND UNBALANCED VOLTAGE DISTUR...IAEME Publication
The growth of power electronictechnology in the field of electric power sector has caused a greater awarenesson the power quality of distribution systems. With the re-structuring of powersystems and with shifting trend towards distributed and dispersed generation,the issue of power quality is going to take newer dimensions. The presentresearch is to identify the prominent concerns in this area and hence themeasures that can enhance the quality of power. This paper investigates theproblems of voltage sag, swell and its severe impact on nonlinear loads,sensitive loads.
Mitigation of Voltage Sag/Swell using Custom Power Devices with SMES System i...Editor IJMTER
Any power problem noticed in voltage, current or frequency deviations that results in
misoperation of customer or end user equipment. The new method of dynamic voltage restorer with
SMES is proposed to protect consumers load from tripping .The DVR can effectively inject the
voltage to the power lines. To improve the performance of DVR the superconducting magnet is
selected as the energy storage unit. The compensation of the voltage sag, swell by short period of
voltage injection. SMES based DVR has been used to improve the performance of power system. It
is having high power rating with maximum efficiency than any other energy storage devices. It
restores line voltage to its nominal value within few milliseconds. Most of the power quality
problems are voltage sag, swell, interruption, transient, fluctuation, etc.. Among those power quality
problem voltage sag is severe one. So it is analyzing and mitigated using custom power device and
SMES system using MATLAB SIMULINK in proposed system.
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.
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.
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.
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.
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
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.
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.
TECHNICAL TRAINING MANUAL GENERAL FAMILIARIZATION COURSEDuvanRamosGarzon1
AIRCRAFT GENERAL
The Single Aisle is the most advanced family aircraft in service today, with fly-by-wire flight controls.
The A318, A319, A320 and A321 are twin-engine subsonic medium range aircraft.
The family offers a choice of engines
Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
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Democratizing Fuzzing at Scale by Abhishek Aryaabh.arya
Presented at NUS: Fuzzing and Software Security Summer School 2024
This keynote talks about the democratization of fuzzing at scale, highlighting the collaboration between open source communities, academia, and industry to advance the field of fuzzing. It delves into the history of fuzzing, the development of scalable fuzzing platforms, and the empowerment of community-driven research. The talk will further discuss recent advancements leveraging AI/ML and offer insights into the future evolution of the fuzzing landscape.
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
Automobile Management System Project Report.pdfKamal Acharya
The proposed project is developed to manage the automobile in the automobile dealer company. The main module in this project is login, automobile management, customer management, sales, complaints and reports. The first module is the login. The automobile showroom owner should login to the project for usage. The username and password are verified and if it is correct, next form opens. If the username and password are not correct, it shows the error message.
When a customer search for a automobile, if the automobile is available, they will be taken to a page that shows the details of the automobile including automobile name, automobile ID, quantity, price etc. “Automobile Management System” is useful for maintaining automobiles, customers effectively and hence helps for establishing good relation between customer and automobile organization. It contains various customized modules for effectively maintaining automobiles and stock information accurately and safely.
When the automobile is sold to the customer, stock will be reduced automatically. When a new purchase is made, stock will be increased automatically. While selecting automobiles for sale, the proposed software will automatically check for total number of available stock of that particular item, if the total stock of that particular item is less than 5, software will notify the user to purchase the particular item.
Also when the user tries to sale items which are not in stock, the system will prompt the user that the stock is not enough. Customers of this system can search for a automobile; can purchase a automobile easily by selecting fast. On the other hand the stock of automobiles can be maintained perfectly by the automobile shop manager overcoming the drawbacks of existing system.
Vaccine management system project report documentation..pdfKamal Acharya
The Division of Vaccine and Immunization is facing increasing difficulty monitoring vaccines and other commodities distribution once they have been distributed from the national stores. With the introduction of new vaccines, more challenges have been anticipated with this additions posing serious threat to the already over strained vaccine supply chain system in Kenya.
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Performance of DVR under various Fault conditions in Electrical Distribution System
1. IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE)
e-ISSN: 2278-1676,p-ISSN: 2320-3331, Volume 8, Issue 1 (Nov. - Dec. 2013), PP 06-12
www.iosrjournals.org
www.iosrjournals.org 6 | Page
Performance of DVR under various Fault conditions in Electrical
Distribution System
Smriti Dey1
1
Assistant Professor, Department of Electrical and Electronics Engineering, Don Bosco College of Engineering
and Technology, Guwahati, India
Abstract: Power quality improvement has become a major area of concern in present era. Due to the increase in
modern sensitive and sophisticated loads connected to the Distribution System it has been very important to
improve the quality of power because nonstandard voltage, current or frequency results a failure of the loads
connected to the systems. Power electronics and advanced control technologies have made it possible to improve
the quality of power and operate the sensitive loads satisfactorily. One of the major problems dealt in this paper
is the voltage quality which is very severe for the industrial customers as it can cause malfunctioning of several
sensitive electronic equipments. Dynamic Voltage Restorer (DVR) is a solution to improve voltage quality, which
is connected in series with the network. This paper presents modelling, analysis and simulation of DVR in
MATLAB SIMULINK, which includes PI controller and discrete PWM generator for control purpose of DVR.
Simulation results of performance of DVR under different fault conditions such as single line to ground fault
(SLG), double line to ground fault (DLG), line to line fault (L-L), three phase to ground fault etc. are presented
in this paper. The results showed clearly the performance of the DVR in voltage quality improvement.
Keywords: Dynamic Voltage Restorer (DVR), voltage quality, PI controller, Pulse Width Modulation (PWM),
power quality.
I. Introduction
Modern society is critically dependent on the supply of electricity. The electrical power system consists
of three functional blocks i.e. power generation, transmission and distribution, which is in the form of
alternating current. The generated power should have certain electrical properties that allow electrical system to
function in their intended manner. It should energize all electrical equipment equally and satisfactorily. Power
travels long distances through transmission lines and due to various equipments or due to any abnormal
conditions in the network, the quality of the power changes and thus it becomes less suitable for any further
application. Voltage magnitude is one of the major factors that determine the quality of electrical power [10].
Hence it is necessary to improve the quality of power before it is used to serve any load. In present scenario
power quality is directly related to distribution system because distribution system locates at the end of the
power system and is directly connected to the customer. The distribution system can be defined as that part of
power system which distributes electrical power to the consumer for utilization [2]. Earlier the prime focus for
power system reliability was on generation and transmission system but now a day‟s distribution system
receives more attention because most of the electrical distribution network failures account for about 90% of the
average customer interruptions and if any disturbance occur in the distribution system a huge amount of
financial losses may happen with the consequent loss of productivity and competitiveness.
Some consumers require a good quality of power higher than the level provided by modern networks of
electricity, hence many efforts have been under taken to fulfil consumer requirement. For delivering clean and
pure power Flexible AC Transmission System (FACTS) devices like static synchronous compensator
(STATCOM), static synchronous series compensator (SSSC), interline power flow controller (IPFC), unified
power flow controller (UPFC) etc. were used. Generally FACTS devices are designed for the transmission
system and these devices are modified to be used in distribution system and named as Custom Power Devices.
Some of the widely used custom power devices are Distribution Static Synchronous Compensator
(DSTATCOM), Dynamic Voltage Restorer (DVR), Active filter (AF), Unified power quality conditioner
(UPQC) [4]. With the help of these devices power quality problems are reduced to a great extent. DVR is one of
the most efficient and effective custom power devices due to its fast response, lower cost and smaller size [12].
Control Unit is the heart of the DVR and its main function is to detect the presence of voltage disturbances
(sag/swell) in the electrical system and operate the VSC to supply the required amount of compensating voltage.
The controlling signal is generated by a Proportional Integral (PI) Controller and a PWM Generator, which
control the output of DVR. PI controller is a type of feedback controller which operates the system to be
controlled with a weighted sum of error. It generates the desired signal for the PWM generator to trigger the
PWM inverter. The Phase lock loop (PLL) and dq0 transformation are also the basic components of DVR [7].
2. Performance of DVR under various Fault conditions in Electrical Distribution System
www.iosrjournals.org 7 | Page
This paper shows the performance of DVR in improving the quality of power under different fault conditions
i.e. single line to ground fault, double line to ground fault, line to line fault, three phase to ground fault,. The
theory related to DVR operation and its different parts have been discussed in the next section. This paper
composed of additional five sections. In section 2 configuration and operation of DVR is explained. In section 3
control mechanism and simulation details of DVR are provided. In section 4 Analysis of the results of the test
system are illustrated. In the last section, some conclusions are drawn.
II. Configuration And Operation Of DVR
Among the power quality problems like sag, swell, harmonic, transients etc, voltage sag is the most
severe disturbance in the power distribution system, generally caused by faults. It last for duration ranging from
3 cycles to 30 cycles [10]. Starting of large induction motors can also result in voltage sag as it draws a large
amount of current during starting which will affect other equipments connected to the system. In order to
mitigate voltage sag or swell in distribution system DVR is one of the efficient and effective custom power
devices. DVR is connected in series with the line and injects or absorbs voltage in order to compensate the
voltage sag or swell in the load side and maintains flat voltage profile at the load end.
DVR is a solid state power electronic switching device comprises of the following components:
i. Storage unit
ii. Voltage source Inverter
iii. Injection transformer
iv. Control unit.
2.1. Principle of operation of DVR
DVR is connected in series with the line between main supply and load as shown in the Fig 1. The
main function of the DVR is to boost up the voltage at load side so that equipments connected at the load end is
free from any power disruption. In addition to voltage sag compensation DVR also carry out other functions
such as line voltage harmonic compensation, reduction of transient voltage and fault current.
Fig.1. Operating principle of DVR
i) Storage unit: The function of the storage unit is to supply the necessary energy to the VSI which will be
converted to alternating quantity and fed to the injection transformer. Batteries are most commonly used
storage unit and the capacity of the battery is determine the amount of the voltage which should be
compensated by the DVR.
ii) Voltage Source Inverter (VSI): A voltage source inverter is a power electronic device consisting of
switching devices and a storage unit such as battery. VSI is used to generate three phase voltage at any
required magnitude, phase and frequency to compensate the load voltage at the required value. IGBT is the
newer compact switching device that is used to design VSI for DVR operation.
iii) Injection transformer: It is used to couple the VSI to the distribution line. The high voltage side is
normally connected in series with the distribution network while the power circuit of the DVR is
connected to the low voltage side [13]. The DVR inject the voltage which is required for the
compensation from DC side of the inverter to the distribution network through the injection transformer.
In this paper three single phase transformers are connected instead of a single three phase injection
transformer and each transformer is connected in series with each phase of the distribution line to couple
the VSI (at low voltage level) to the higher distribution level. The transformer also helps in isolating the
line from the DVR system.
iv) Control unit: A controller is used for proper operation of DVR, which detect the presence of voltage
disturbance and operate VSI to mitigate the voltage sag/swell. Pulse Width Modulation (PWM) control
technique is applied for inverter switching so as to generate a three phase sinusoidal voltage. The magnitude
of load voltage is compared with reference voltage and if any difference is there error signal will be
generated, which is an actuating signal. This error signal drives the PI controller and the final output signal
which is obtained (Fig.2) controls the pulses for the Inverter. PI controller is a feedback controller which
3. Performance of DVR under various Fault conditions in Electrical Distribution System
www.iosrjournals.org 8 | Page
controls the system depending on the error signal. In PI controller technique the proportional response can
be obtained by multiplying the error with constant K p (proportional gain) and the integral response is
proportional to both the magnitude of error and duration of error.
Fig.2. Operation of PI controller
In this paper, the dq0 transformation or the Park‟s transformation is used for voltage calculation where the three
phase stationary co-ordinate system is converted to the dq0 rotating quantity. The dq0 transformation technique
is used to give the information of the depth (d) and phase shift (q) of voltage sag/ swell with starting and ending
time. The V0, Vd and Vqare obtained as
0
1
0
3
a b cV V V V
(1)
2 2 2
sin sin sin
3 3 3
d a b cV V t V t V t
(2)
2 2 2
cos cos cos
3 3 3
q a b cV V t V t V t
(3)
Conversion of the three phase voltage Va, Vb and Vc into two constant voltages Vd and Vq is done for easy control of
the system. The controller input is the output voltage measured by three-phase V-I measurement at load and this
load voltage is then transformed into the dq form. If there is any voltage sag/ swell then the error signal is
generated from the difference between the dq voltage and the reference voltage. The d- reference is set to the rated
voltage while the q- reference is always set to zero. The gains such as Kp and Ki control the stability of the system.
The output obtained from the PI controller is then again transformed back to Vabc by dq0 to abc converter before it
is forwarded to the PWM generator, which generates 6 pulses to trigger the PWM inverter.
2.2 Mathematical Model of DVR:
Fig.3. Overall diagram of DVR
From Fig.3 the equation of voltage is found to be
VDVR= Vload2 - Vload1 (4)
Where,
V load2 = Desired load Voltage
V load1 = Load voltage during fault
Vs = Supply voltage.
When a fault is occurred in the system the system voltage drops from any specific value then the DVR injects a
series voltage i.e. VDVR via the injection transformer so that the load voltage V load1 can be maintained at required
level.
4. Performance of DVR under various Fault conditions in Electrical Distribution System
www.iosrjournals.org 9 | Page
III. Control Mechanism And Simulation Details Of DVR
Fig.4. Flow chart of control scheme of DVR
The Fig.4 shows flow chart of the method implemented in this paper. At the very beginning the magnitude of
source voltage VS and load voltage Vload2 are measured. When a fault is applied at the distribution line and
magnitude of the load voltage is measured again and it becomes Vload1. Then Vload1 is compared with Vload2 if
Vload1 is equal to Vload2 then DVR will not operate i.e. no injection of voltage to the line. But if Vload1 is less than
Vload2 then DVR will inject the sag voltage Vsag and if Vload1 is greater than Vload2 DVR will absorb extra voltage.
After injection or absorption the new voltage will be Vload1=Vload2. The DVR will operate until it detects the
difference between the load voltage before fault and during fault, i.e. the DVR will maintain the load voltage at
nominal value until the fault is removed.
Table 1: System Parameters
Sr. No Parameters Standards
1 Source 3 phase, 11 KV, 50 Hz
2 Inverter Parameters IGBT based, 3 arms, 6 pulse, Carrier frequency= 1080 Hz , Sample
time = 50 µs
3 Proportional Integral Controller
[2]
Kp1 = 20, Ki1 = 154, Sample time = 50 µs,
Kp2 = 25, Ki2 = 260, Sample time = 50 µs
4 RL load Active power = 1kW, Inductive Reactive power = 500 VAR
5 Two winding transformer Yg/∆, 11/11KV
The components required for constructing the DVR test model is shown in the Fig.3 and Table1 shows the
parameters of DVR test system consisting of 11KV, 50 Hz source feeding one distribution line through a two
winding transformer.
5. Performance of DVR under various Fault conditions in Electrical Distribution System
www.iosrjournals.org 10 | Page
IV. Results And Analysis Of The Proposed DVR Model
Fig.4. DVR Test model
4.1 Fault analysis:
Voltage disturbance is created by applying fault on the test system at the load side. The various results
obtained by applying different types of faults i.e. SLG, DLG, L-L fault, three phase fault to ground. Simulation
results are analysed and discussed. The test system is shown in Fig. 4, which is implemented by using
MATLAB software. The test system comprises of 11KV distribution network with three phase parallel RL load.
Fig.5.Input and load voltage without fault
Fig.5 shows the waveforms of input voltage and load voltage without creating any fault on the distribution
network. Input voltage and load voltage is found to be almost equal to 9000KV. Load voltage is slightly less
than input voltage due to voltage drop in the line. The system is operated twice for each types of fault. The
simulation time for the model is taken as 1 sec. The first simulation is without DVR and second simulation is
with DVR with fault resistance of 0.66Ω for a time duration of 100 ms i.e. from 0.1s to 0.2s and the ground
resistance is 0.001Ω.
4.1.1 Single line to ground fault:
Fig.6 (a) shows the load voltage when single line to ground fault applied on phase „A‟. Fig.6 (b) shows
the load voltage after compensation.
(a) (b)
Fig.6 (a) load voltage without DVR; (b) load voltage with DVR.
6. Performance of DVR under various Fault conditions in Electrical Distribution System
www.iosrjournals.org 11 | Page
It is seen from the Fig.6 during SLG fault voltage at the faulted line reduced to 250 V from 9000V i.e. voltage
sag occurs at phase „A‟ and voltage at the other two phases increased to 13000V from 9000V i.e. at phases „B‟
and „C‟ voltage swell occurs. When DVR is connected to the line the load voltage becomes almost equal to the
desired load voltage.
4.1.2 Double line to ground fault:
(a) (b)
Fig.6 (a) load voltage without DVR; (b) load voltage with DVR.
Fig.6 (a) shows the load voltage when double line to ground fault is applied on phase „A‟ and phase „B‟. Fig.7
(b) shows the load voltage after compensation. The fault is applied on phase „A‟ and „B‟ thus voltage dip is
observed in Red and Yellow phase of the system and its magnitude reduced to 500 V while phase „C‟ i.e.
voltage of Blue phase has been increased to 1.4 KV. When DVR is connected to the system it is seen that
voltage dip occurring in the two phases are compensated to a great extent.
4.2.3 Line to line fault:
(a) (b)
Fig.7. (a) load voltage without DVR; (b) load voltage with DVR.
Fig.7 (a) shows waveforms for the load voltage without DVR compensation for L-L fault. When fault is applied
in phase „A‟ and „B‟ voltage dip is observed in Red and Yellow phase of the system and its magnitude reduces
from 9000 to 5000 V while phase „C‟ i.e. voltage of Blue phase remains unaffected. Simulation result of Fig. 7
(b) shows the load voltage waveform when DVR is connected to the system and it is seen that voltage dip
occurred in the two phases are compensated to a great extent.
4.1.4 Three phase to ground fault:
Fig.8 (a) shows the waveform of load voltage with fault and without DVR. During fault period the
magnitude of the load voltage decreases from 9000V to 800V. This voltage dip is needed to be compensated to
get the desired voltage at the load or to get the proper operation of the load connected to the system.
(a) (b)
Fig.8. (a) load voltage without DVR; (b) load voltage with DVR.
The simulation result of Fig.8 (b) shows the load voltage waveform when DVR is introduced at the load side to
compensate the voltage sag occurred due to the three phase fault applied. From this figure it is clearly observed
that the voltage waveform that is obtained after connection of DVR in series is almost similar to the load voltage
without fault.
7. Performance of DVR under various Fault conditions in Electrical Distribution System
www.iosrjournals.org 12 | Page
It is observed from the above figures that due to fault the load voltage reduce to a very low value. If we compare
the waveforms of load voltage with and without DVR, we observed that when the DVR is in operation the
voltage dip is compensated almost completely and the r.m.s voltage at the sensitive load is maintained at desired
value i.e. near about 9000 V. The DVR is designed to supply or absorb difference in voltage under different
fault conditions i.e. until the fault is removed from the network.
V. Conclusion
In this paper, the simulation of a DVR is done using MATLAB SIMULINK software. Thus it became
easier to construct the large distribution network and analyse the performance DVR under different fault
conditions. The controlling of DVR is done with the help of PI controller. The simulation results clearly showed
the performance of the DVR in improving the quality of voltage due to faults in distribution system. DVR is one
of the fast and effective custom power device has shown the efficiency and effectiveness on voltage sag and swell
compensation hence it makes DVR to be an effective power quality improvement Device. This has been proved
through simulation implementation. The proposed work showed that in case of SLG fault and three phase fault
almost 95% of compensation is done and in case of DLG and L-L fault voltage compensation took place for
almost 75% and 44%.
Besides PI controllers, other controllers like fuzzy controllers and adaptive PI fuzzy controllers can
also be used as a DVR controller. In future, the multilevel concept of inverters will be a prominent choice for
power electronic systems mainly for medium voltage operation. Multilevel inverter concept is the best alternator
to employ low-frequency inverters with low output voltage distortion.
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[ 9 ] . Bingsen Wang, Giri Venkataramanan and Mahesh Illindala, “Operation and Control of a Dynamic Voltage Restorer Using.
Transformer Coupled H -Bridge Converters”, I EE E t r a n s a c ti o n s on Power electronics, vol. 21, pp. 1053-1061, July06
[10]. Rosli Omar, N.A. Rahim and Marizan Slaiman, “Dynamic Voltage restorer Application for Power Quality improvement in
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[11]. Chi-Seng Lam, Man-Chung Wong, Ying-Duo Han “Voltage Swell and Overvoltage Compensation With Unidirectional Power
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[13]. Design and simulation of DSTATCOM for power quality Improvement