The document summarizes research on using a static synchronous compensator (STATCOM) to mitigate voltage flickers caused by wind speed variations in a wind farm. It describes a simulation of a 60MW wind farm connected to the grid through a transformer and transmission line. Simulation results show that without a STATCOM, wind speed variations from 5-13 m/s cause the voltage to vary from 91-103% of the base value. The addition of a 30MVar STATCOM controlled using PI control significantly reduces the voltage variations to 0.99-1.005 pu, improving power quality. The STATCOM supplies or absorbs reactive power according to the voltage level to regulate it.
Performance Improvement of a Grid Connected Wind Farm SystemIOSRJEEE
Renewable energy sources are becoming more promising means of green energy production. But the increasingly penetration level of wind energy into existing power system presents many technical challenges. Power quality is a measure of the system performance. It requires consideration of problems like voltage regulation, stability, harmonics etc. This paper presents an overview of grid connected system and analysis of its stability. The system is assumed with fixed speed Induction generator integrated to a weak grid. Change and improvement in performance is observed with various FACT devices. The simulation model has been developed in MATLAB/SIMULINK R2016a.
Stabilization and Frequency Regulation in Microgrid by Controlling Pitch Angleijtsrd
PID controller based pitch angle controller for the frequency regulation and active power control in a wind turbine and diesel engine powered hybrid power system, is presented in this paper. For testing the prosed controller, variable wind speed pattern is used for realization of real time wind behavior. Furthermore, the variable load is also connected to the hybrid power system to test the efficacy of the prosed controller. The system is modelled and simulated in MATLAB environment and results obtained are compared with and without pitch angle controller. The frequency deviations in PID based pitch angle controller is less than the without controller. Aman Malik | Kavita Sharma "Stabilization and Frequency Regulation in Microgrid by Controlling Pitch Angle" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-4 | Issue-6 , October 2020, URL: https://www.ijtsrd.com/papers/ijtsrd33303.pdf Paper Url: https://www.ijtsrd.com/engineering/electrical-engineering/33303/stabilization-and-frequency-regulation-in-microgrid-by-controlling-pitch-angle/aman-malik
SIMULATION OF IMPROVEMENT OF POWER QUALITY USING STATCOM-CONTROL SCHEME WITH ...ijiert bestjournal
The use of wind energy generation in electrical gri d is increasing worldwide. Injection of the wind power into an electric grid affects the power quality. The generated wind power is always not constant due to its time varying nature and causing stability problems. This weak interconnection of wind generating source in the el ectrical network affects the power quality and reliability. In this paper the power quality pr oblem due to installation of wind turbine with the grid is determine. In this proposed scheme Static Compensator (STATCOM) is connected at a point of common coupling to reduce t he power quality problems. The STATCOM gives reactive power support to wind genera tor and also load. The proposed system maintains the grid voltage free from distort ion and harmonics. In this paper the effect of STATCOM is presented. The behavior of STATCOM is studied under reactive l oading condition.
The Enhanced Performance SVC for Transient Instability Oscillation DampingPower System Operation
To utilise green energy, renewables have penetrated into utility. However, its intermittent nature affects on power quality and
network stability. Static var compensators (SVCs) have been installed in order to gain power quality improvement. Nevertheless,
lacking of real power support, the SVCs cannot minimise any instability. This paper presents a technique to provide the SVCs the
ability to enhance their performance. Dynamic oscillation damper is co-located with a typical SVC, offering ability to damp
oscillations. Simulation shows the proposed system performance was greatly enhanced. This envisages future applications,
where a combination of distributed generators and renewables causes severe interaction.
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.
Performance Improvement of a Grid Connected Wind Farm SystemIOSRJEEE
Renewable energy sources are becoming more promising means of green energy production. But the increasingly penetration level of wind energy into existing power system presents many technical challenges. Power quality is a measure of the system performance. It requires consideration of problems like voltage regulation, stability, harmonics etc. This paper presents an overview of grid connected system and analysis of its stability. The system is assumed with fixed speed Induction generator integrated to a weak grid. Change and improvement in performance is observed with various FACT devices. The simulation model has been developed in MATLAB/SIMULINK R2016a.
Stabilization and Frequency Regulation in Microgrid by Controlling Pitch Angleijtsrd
PID controller based pitch angle controller for the frequency regulation and active power control in a wind turbine and diesel engine powered hybrid power system, is presented in this paper. For testing the prosed controller, variable wind speed pattern is used for realization of real time wind behavior. Furthermore, the variable load is also connected to the hybrid power system to test the efficacy of the prosed controller. The system is modelled and simulated in MATLAB environment and results obtained are compared with and without pitch angle controller. The frequency deviations in PID based pitch angle controller is less than the without controller. Aman Malik | Kavita Sharma "Stabilization and Frequency Regulation in Microgrid by Controlling Pitch Angle" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-4 | Issue-6 , October 2020, URL: https://www.ijtsrd.com/papers/ijtsrd33303.pdf Paper Url: https://www.ijtsrd.com/engineering/electrical-engineering/33303/stabilization-and-frequency-regulation-in-microgrid-by-controlling-pitch-angle/aman-malik
SIMULATION OF IMPROVEMENT OF POWER QUALITY USING STATCOM-CONTROL SCHEME WITH ...ijiert bestjournal
The use of wind energy generation in electrical gri d is increasing worldwide. Injection of the wind power into an electric grid affects the power quality. The generated wind power is always not constant due to its time varying nature and causing stability problems. This weak interconnection of wind generating source in the el ectrical network affects the power quality and reliability. In this paper the power quality pr oblem due to installation of wind turbine with the grid is determine. In this proposed scheme Static Compensator (STATCOM) is connected at a point of common coupling to reduce t he power quality problems. The STATCOM gives reactive power support to wind genera tor and also load. The proposed system maintains the grid voltage free from distort ion and harmonics. In this paper the effect of STATCOM is presented. The behavior of STATCOM is studied under reactive l oading condition.
The Enhanced Performance SVC for Transient Instability Oscillation DampingPower System Operation
To utilise green energy, renewables have penetrated into utility. However, its intermittent nature affects on power quality and
network stability. Static var compensators (SVCs) have been installed in order to gain power quality improvement. Nevertheless,
lacking of real power support, the SVCs cannot minimise any instability. This paper presents a technique to provide the SVCs the
ability to enhance their performance. Dynamic oscillation damper is co-located with a typical SVC, offering ability to damp
oscillations. Simulation shows the proposed system performance was greatly enhanced. This envisages future applications,
where a combination of distributed generators and renewables causes severe interaction.
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.
Power Quality Improvement Using Custom Power Devices in Squirrel Cage Inducti...IJPEDS-IAES
Wind farm is connected to the grid directly.The wind is not constant voltage fluctuations occur at point of common coupling (PCC) and WF terminal. To overcome this problem a new compensation strategy is used. By using Custom power devices (UPQC).It injects reactive power at PCC. The advantages of UPQC are it consists of both DVR and D-STATCOM. DVR is connected in series to the line and it injects in phase voltage into the line .D- STATCOM is connected shunt to the line .The internal control strategy is based on management of active and reactive power in series and shunt converters of UPQC. The power exchainge is done by using DC-link.
Performance of FACTS Devices for Power System Stabilityijeei-iaes
When a power grid is connected to an induction type wind electric generator (WEG), when there is variation in load and wind speed, grid voltage also vary. In this paper, we study what is the impact when there is a variation of load and wind by variation of real power and reactive power consumed by WEG effect of load and wind speed variations on real power supplied and reactive power consumed by the WEG as well as voltage on the grid are studied. The voltage variation in the grid is controlled by reactive power compensation using shunt connected Static VAR Compensator (SVC) comprising Thyristor Controlled Reactor (TCR) and Fixed Capacitor (FC). With the help of Fuzzy Logic Controller (FLC), TCR is operated automatically.
STATCOM Based Wind Energy System by using Hybrid Fuzzy Logic ControllerIJMTST Journal
The influence of the hybrid system in the grid system concerning the power quality measurements are the active power, reactive power, voltage deviation, flicker, harmonics, and electrical behavior of switching operation and these are measured according to International Electro-Technical Commission (IEC). The STATCOM provides reactive power support to hybrid system and load. These voltage fluctuations can be eliminated with the help of advanced reactive power compensator device such as SVC and STATCOM. This work focus on design, modeling and analysis of FACTS device in wind farm interconnected with grid during fault. These devices can be controlled by Synchronous Reference Frame theory. The performance is analyzed with the help of PI controller and Fuzzy logic technique. by using Matlab/Simulink Model.
Comparison of upqc and dvr in wind turbine fed fsig under asymmetric faultselelijjournal
This paper presents the mitigation of faults in wind turbine connected fixed speed induction generator using unified power quality conditioner and static compensator. The UPQC consists of shunt and series converters connected back-to-back through a dc-to-dc step up converter. The presence of the dc-to-dc step converter permits the UPQC to compensate faults for long duration. The series converter is connected to the supply side whereas the shunt converter is connected to the load side. The control system of the proposed UPQC is based on Id-Iq theory. The DVR consists of shunt and series converters connected back-to-back through a dc-to-dc step up converter. The presence of the dc-to-dc step converter permits the DVR to compensate faults for long duration. The series converter is connected to the supply side whereas the shunt converter is connected to the load side. The control system of the proposed DVR is based on
hysteresis voltage controlThe proposed wind turbine fed fixed speed induction generator is evaluated and simulated using MATLAB/SIMULINK environment with UPQC and DVR under asymmetric faults
14 9737 lightning paper id 0005 edit septianIAESIJEECS
Study the impacts of lightning-induced transient overvoltage on a hybrid PV-Wind system has been addressed in this work. Overvoltage that is generated due to lightning stroke travels along the system where it can be very harmful to the expensive equipment of the system such as PV models, inverters, charge controllers, batteries, transformers, and generator etc. The simulation model of a system has been completed by using PSCAD/EMTDC software. The system comprises of 2 MW PV farm, battery system, 2.1 MW wind farm and loads which are all connected to the common AC bus and then to the utility grid through an interfacing transformer. Lightning current is generated by using the double exponential function, from the simulation results, when the lightning current is injected to the AC and DC sides of PV system, the transient current and voltage have appeared at different points of the hybrid system. The results were obtained for 8/20 μs and 10/350 μs standards lightning waveforms with current magnitude of 100 kA.
The transient stability analysis of wind turbines interconected to grid under...IJECEIAES
Wind farm has been growing in recent years due to its very competitive electricity production cost. Wind generators have gone from a few kilowatts to megawatts. However, the participation of the wind turbine in the stability of the electricity grid is a critical point to check, knowing that the electricity grid is meshed, any change in active and reactive flux at the network level affects its stability. With a rate of 50% wind turbine penetration into the electricity grid, the stability of the rotor angle is a dynamic phenomenon which is only visible by the variation of the active energy. The purpose of this journal is to verify the impact of wind turbine integration on an electrical grid, by exploiting the relationship between the reactive energy produced by the Doubly Fed Induction Generator equipping most wind energy systems, and the stability of the rotor angle of the synchronous generators equipping the conventional power plants in the electrical system.
Engineering Research Publication
Best International Journals, High Impact Journals,
International Journal of Engineering & Technical Research
ISSN : 2321-0869 (O) 2454-4698 (P)
www.erpublication.org
A stable operation of wind turbines connected to the grid is an essential requirement to ensure the reliability and stability of the power system. To achieve such operational objective, installing static synchronous compensator static synchronous compensator (STATCOM) as a main compensation device guarantees the voltage stability enhancement of the wind farm connected to distribution network at different operating scenarios. STATCOM either supplies or absorbs reactive power in order to ensure the voltage profile within the standard-margins and to avoid turbine tripping, accordingly. This paper present new study that investigates the most suitable-location to install STATCOM in a distribution system connected wind farm to maintain the voltage-levels within the stability margins. For a large-scale squirrel cage induction generator squirrel-cage induction generator (SCIG-based) wind turbine system, the impact of STATCOM installation was tested in different places and voltage-levels in the distribution system. The proposed method effectiveness in enhancing the voltage profile and balancing the reactive power is validated, the results were repeated for different scenarios of expected contingencies. The voltage profile, power flow, and reactive power balance of the distribution system are observed using MATLAB/Simulink software.
International Journal of Engineering Research and Applications (IJERA) is a team of researchers not publication services or private publications running the journals for monetary benefits, we are association of scientists and academia who focus only on supporting authors who want to publish their work. The articles published in our journal can be accessed online, all the articles will be archived for real time access.
Our journal system primarily aims to bring out the research talent and the works done by sciaentists, academia, engineers, practitioners, scholars, post graduate students of engineering and science. This journal aims to cover the scientific research in a broader sense and not publishing a niche area of research facilitating researchers from various verticals to publish their papers. It is also aimed to provide a platform for the researchers to publish in a shorter of time, enabling them to continue further All articles published are freely available to scientific researchers in the Government agencies,educators and the general public. We are taking serious efforts to promote our journal across the globe in various ways, we are sure that our journal will act as a scientific platform for all researchers to publish their works online.
Fault Ride-Through capability of DSTATCOM for Distributed Wind Generation SystemIJPEDS-IAES
In this paper, fault ride through analysis of a low voltage distribution system
augmented with distributed wind generation using squirrel cage induction
generator and distribution static compensator (DSTATCOM) is carried out
through modeling and simulation study in MATLAB. The impact of
unbalanced (single line to ground) fault in a low voltage distribution system
in normal and severe conditions is studied and analyzed in details. Analysis
on system instability is also shown in case of sever fault condition. A
distribution Static Compensator (DSTATCOM) is used to improve fault ride
through (FRT) capability of wind generation system by compensating
positive sequence voltage. A comparison of dynamic response of the system
with and without DSTATCOM and effects of DSTATCOM on voltage and
generator speed are presented. The simulation results shows that
DSTATCOM is capable of reducing the voltage dips and improving the
voltage profiles by providing reactive power support to distributed wind
generation system under unbalanced fault condition and enhances the fault
ride through capability of the wind generator.
A review on SVC control for power system stability with and without auxiliary...journalBEEI
Since the beginning of the last century, power system stability has been recognized as a vital problem in securing system operation. Power system instability has caused many major blackouts. This paper reviewed the previous technical works consisting of various methods of optimization in controlling power system stability. The techniques presented were compared to optimize the control variables for optimization of power system stability. Power system stability enhancement has been investigated widely in literature using different ways. This paper is focusing on SVC performance for enhancing power system stability either through SVC controlled itself or SVC controlled externally by other controllers. Static VAR compensators (SVCs) are used primarily in power system for voltage control as either an end in itself or a means of achieving other objectives, such as system stabilization.The analysis on performance of the previous work such as advantages and findings of a robust method approach in each technique was included in this paper.
Voltage Stabilization of a Wind Turbine with STATCOM Using Intelligent Contro...ijeei-iaes
Application of FACTS controller called Static Synchronous Compensator STATCOM to improve the performance of power grid with Wind System is investigated. The essential feature of the STATCOM is that it has the ability to absorb or inject fastly reactive power with power grid. Therefore the voltage regulation of the power grid with STATCOM FACTS device is achieved. Moreover restoring the stability of the wind system at suddenly step up or down in wind speed is obtained with STATCOM. This paper describes a complete simulation of voltage regulation of a wind system using STATCOM. Conventional control technique as proportional plus integral controller , and intelligent techniques as FLC and ANFIS are used in this work. The control technique is performed using MATLAB package software. The dynamic response of uncontrolled system is also investigated under wide range of disturbances. The voltage regulation by using STATCOM whose output is varied so as to maintain or control output voltage in the system. The dynamic response of controlled system is shown and comparison between the uncontrolled system and the controlled system is described to assure the validity of the proposed controller. Also comparison between the proposed control methods scheme is presented. To validate the powerful of the STATCOM FACTS controllers, the studied power system is simulated and subjected to different severe disturbances. The results prove the effectiveness of the proposed STATCOM controller in terms of fast damping the power system oscillations and restoring the power system stability and voltage.
ER Publication,
IJETR, IJMCTR,
Journals,
International Journals,
High Impact Journals,
Monthly Journal,
Good quality Journals,
Research,
Research Papers,
Research Article,
Free Journals, Open access Journals,
erpublication.org,
Engineering Journal,
Science Journals,
Power Quality Improvement Using Custom Power Devices in Squirrel Cage Inducti...IJPEDS-IAES
Wind farm is connected to the grid directly.The wind is not constant voltage fluctuations occur at point of common coupling (PCC) and WF terminal. To overcome this problem a new compensation strategy is used. By using Custom power devices (UPQC).It injects reactive power at PCC. The advantages of UPQC are it consists of both DVR and D-STATCOM. DVR is connected in series to the line and it injects in phase voltage into the line .D- STATCOM is connected shunt to the line .The internal control strategy is based on management of active and reactive power in series and shunt converters of UPQC. The power exchainge is done by using DC-link.
Performance of FACTS Devices for Power System Stabilityijeei-iaes
When a power grid is connected to an induction type wind electric generator (WEG), when there is variation in load and wind speed, grid voltage also vary. In this paper, we study what is the impact when there is a variation of load and wind by variation of real power and reactive power consumed by WEG effect of load and wind speed variations on real power supplied and reactive power consumed by the WEG as well as voltage on the grid are studied. The voltage variation in the grid is controlled by reactive power compensation using shunt connected Static VAR Compensator (SVC) comprising Thyristor Controlled Reactor (TCR) and Fixed Capacitor (FC). With the help of Fuzzy Logic Controller (FLC), TCR is operated automatically.
STATCOM Based Wind Energy System by using Hybrid Fuzzy Logic ControllerIJMTST Journal
The influence of the hybrid system in the grid system concerning the power quality measurements are the active power, reactive power, voltage deviation, flicker, harmonics, and electrical behavior of switching operation and these are measured according to International Electro-Technical Commission (IEC). The STATCOM provides reactive power support to hybrid system and load. These voltage fluctuations can be eliminated with the help of advanced reactive power compensator device such as SVC and STATCOM. This work focus on design, modeling and analysis of FACTS device in wind farm interconnected with grid during fault. These devices can be controlled by Synchronous Reference Frame theory. The performance is analyzed with the help of PI controller and Fuzzy logic technique. by using Matlab/Simulink Model.
Comparison of upqc and dvr in wind turbine fed fsig under asymmetric faultselelijjournal
This paper presents the mitigation of faults in wind turbine connected fixed speed induction generator using unified power quality conditioner and static compensator. The UPQC consists of shunt and series converters connected back-to-back through a dc-to-dc step up converter. The presence of the dc-to-dc step converter permits the UPQC to compensate faults for long duration. The series converter is connected to the supply side whereas the shunt converter is connected to the load side. The control system of the proposed UPQC is based on Id-Iq theory. The DVR consists of shunt and series converters connected back-to-back through a dc-to-dc step up converter. The presence of the dc-to-dc step converter permits the DVR to compensate faults for long duration. The series converter is connected to the supply side whereas the shunt converter is connected to the load side. The control system of the proposed DVR is based on
hysteresis voltage controlThe proposed wind turbine fed fixed speed induction generator is evaluated and simulated using MATLAB/SIMULINK environment with UPQC and DVR under asymmetric faults
14 9737 lightning paper id 0005 edit septianIAESIJEECS
Study the impacts of lightning-induced transient overvoltage on a hybrid PV-Wind system has been addressed in this work. Overvoltage that is generated due to lightning stroke travels along the system where it can be very harmful to the expensive equipment of the system such as PV models, inverters, charge controllers, batteries, transformers, and generator etc. The simulation model of a system has been completed by using PSCAD/EMTDC software. The system comprises of 2 MW PV farm, battery system, 2.1 MW wind farm and loads which are all connected to the common AC bus and then to the utility grid through an interfacing transformer. Lightning current is generated by using the double exponential function, from the simulation results, when the lightning current is injected to the AC and DC sides of PV system, the transient current and voltage have appeared at different points of the hybrid system. The results were obtained for 8/20 μs and 10/350 μs standards lightning waveforms with current magnitude of 100 kA.
The transient stability analysis of wind turbines interconected to grid under...IJECEIAES
Wind farm has been growing in recent years due to its very competitive electricity production cost. Wind generators have gone from a few kilowatts to megawatts. However, the participation of the wind turbine in the stability of the electricity grid is a critical point to check, knowing that the electricity grid is meshed, any change in active and reactive flux at the network level affects its stability. With a rate of 50% wind turbine penetration into the electricity grid, the stability of the rotor angle is a dynamic phenomenon which is only visible by the variation of the active energy. The purpose of this journal is to verify the impact of wind turbine integration on an electrical grid, by exploiting the relationship between the reactive energy produced by the Doubly Fed Induction Generator equipping most wind energy systems, and the stability of the rotor angle of the synchronous generators equipping the conventional power plants in the electrical system.
Engineering Research Publication
Best International Journals, High Impact Journals,
International Journal of Engineering & Technical Research
ISSN : 2321-0869 (O) 2454-4698 (P)
www.erpublication.org
A stable operation of wind turbines connected to the grid is an essential requirement to ensure the reliability and stability of the power system. To achieve such operational objective, installing static synchronous compensator static synchronous compensator (STATCOM) as a main compensation device guarantees the voltage stability enhancement of the wind farm connected to distribution network at different operating scenarios. STATCOM either supplies or absorbs reactive power in order to ensure the voltage profile within the standard-margins and to avoid turbine tripping, accordingly. This paper present new study that investigates the most suitable-location to install STATCOM in a distribution system connected wind farm to maintain the voltage-levels within the stability margins. For a large-scale squirrel cage induction generator squirrel-cage induction generator (SCIG-based) wind turbine system, the impact of STATCOM installation was tested in different places and voltage-levels in the distribution system. The proposed method effectiveness in enhancing the voltage profile and balancing the reactive power is validated, the results were repeated for different scenarios of expected contingencies. The voltage profile, power flow, and reactive power balance of the distribution system are observed using MATLAB/Simulink software.
International Journal of Engineering Research and Applications (IJERA) is a team of researchers not publication services or private publications running the journals for monetary benefits, we are association of scientists and academia who focus only on supporting authors who want to publish their work. The articles published in our journal can be accessed online, all the articles will be archived for real time access.
Our journal system primarily aims to bring out the research talent and the works done by sciaentists, academia, engineers, practitioners, scholars, post graduate students of engineering and science. This journal aims to cover the scientific research in a broader sense and not publishing a niche area of research facilitating researchers from various verticals to publish their papers. It is also aimed to provide a platform for the researchers to publish in a shorter of time, enabling them to continue further All articles published are freely available to scientific researchers in the Government agencies,educators and the general public. We are taking serious efforts to promote our journal across the globe in various ways, we are sure that our journal will act as a scientific platform for all researchers to publish their works online.
Fault Ride-Through capability of DSTATCOM for Distributed Wind Generation SystemIJPEDS-IAES
In this paper, fault ride through analysis of a low voltage distribution system
augmented with distributed wind generation using squirrel cage induction
generator and distribution static compensator (DSTATCOM) is carried out
through modeling and simulation study in MATLAB. The impact of
unbalanced (single line to ground) fault in a low voltage distribution system
in normal and severe conditions is studied and analyzed in details. Analysis
on system instability is also shown in case of sever fault condition. A
distribution Static Compensator (DSTATCOM) is used to improve fault ride
through (FRT) capability of wind generation system by compensating
positive sequence voltage. A comparison of dynamic response of the system
with and without DSTATCOM and effects of DSTATCOM on voltage and
generator speed are presented. The simulation results shows that
DSTATCOM is capable of reducing the voltage dips and improving the
voltage profiles by providing reactive power support to distributed wind
generation system under unbalanced fault condition and enhances the fault
ride through capability of the wind generator.
A review on SVC control for power system stability with and without auxiliary...journalBEEI
Since the beginning of the last century, power system stability has been recognized as a vital problem in securing system operation. Power system instability has caused many major blackouts. This paper reviewed the previous technical works consisting of various methods of optimization in controlling power system stability. The techniques presented were compared to optimize the control variables for optimization of power system stability. Power system stability enhancement has been investigated widely in literature using different ways. This paper is focusing on SVC performance for enhancing power system stability either through SVC controlled itself or SVC controlled externally by other controllers. Static VAR compensators (SVCs) are used primarily in power system for voltage control as either an end in itself or a means of achieving other objectives, such as system stabilization.The analysis on performance of the previous work such as advantages and findings of a robust method approach in each technique was included in this paper.
Voltage Stabilization of a Wind Turbine with STATCOM Using Intelligent Contro...ijeei-iaes
Application of FACTS controller called Static Synchronous Compensator STATCOM to improve the performance of power grid with Wind System is investigated. The essential feature of the STATCOM is that it has the ability to absorb or inject fastly reactive power with power grid. Therefore the voltage regulation of the power grid with STATCOM FACTS device is achieved. Moreover restoring the stability of the wind system at suddenly step up or down in wind speed is obtained with STATCOM. This paper describes a complete simulation of voltage regulation of a wind system using STATCOM. Conventional control technique as proportional plus integral controller , and intelligent techniques as FLC and ANFIS are used in this work. The control technique is performed using MATLAB package software. The dynamic response of uncontrolled system is also investigated under wide range of disturbances. The voltage regulation by using STATCOM whose output is varied so as to maintain or control output voltage in the system. The dynamic response of controlled system is shown and comparison between the uncontrolled system and the controlled system is described to assure the validity of the proposed controller. Also comparison between the proposed control methods scheme is presented. To validate the powerful of the STATCOM FACTS controllers, the studied power system is simulated and subjected to different severe disturbances. The results prove the effectiveness of the proposed STATCOM controller in terms of fast damping the power system oscillations and restoring the power system stability and voltage.
ER Publication,
IJETR, IJMCTR,
Journals,
International Journals,
High Impact Journals,
Monthly Journal,
Good quality Journals,
Research,
Research Papers,
Research Article,
Free Journals, Open access Journals,
erpublication.org,
Engineering Journal,
Science Journals,
APPLICATION OF STATCOM to IMPROVED DYNAMIC PERFORMANCE OF POWER SYSTEMijsrd.com
Application of FACTS controller called Static Synchronous Compensator STATCOM to improve the performance of power grid with Wind Farms is investigated .The essential feature of the STATCOM is that it has the ability to absorb or inject fastly the reactive power with power grid . Therefore the voltage regulation of the power grid with STATCOM FACTS device is achieved. Moreover restoring the stability of the power system having wind farm after occurring severe disturbance such as faults or wind farm mechanical power variation is obtained with STATCOM controller . The dynamic model of the power system having wind farm controlled by proposed STATCOM is developed . To validate the powerful of the STATCOM FACTS controller, the studied power system is simulated and subjected to different severe disturbances. The results prove the effectiveness of the proposed STATCOM controller in terms of fast damping the power system oscillations and restoring the power system stability.
Influencing Power Flow and Transient Stability by Static Synchronous Series C...ijeei-iaes
In the present world, modern power system networks, being a complicated combination of generators, transmission lines, transformers, circuit breakers and other devices, are more vulnerable to various types of faults causing stability problems. Among these faults, transient fault is believed to be a major disturbance as it causes large damage to a sound system within a certain period of time. Therefore, the protection against transient faults, better known as transient stability control is one of the major considerations for the power system engineers. This paper presents the control approach in the transmission line during transient faults by means of Static Synchronous Series Compensator (SSSC) in order to stabilize Single Machine Infinite Bus (SMIB) system. In this paper, SSSC is represented by variable voltage injection associated with the transformer leakage reactance and the voltage source. The comparative results depict that the swing curve of a system increases monotonically after the occurrence of transient faults However, SSSC is effective enough to make it stable after a while.
Efficacy of Facts in Power Oscillation Damping and Renewable IntegrationIOSRJEEE
This paper discusses about the approach towards effective power oscillation damping, root causes for the genesis of power oscillation and various methodologies adopted to eradicate it.This paper presents an unified approach of FACTS controller installation in order to ensure effective power oscillation damping. The power oscillations, if not controlled within time, may aggravate the entire power system’s functioning and ultimate outcome as blackout. The network congestion has been a matter of serious concern to utility operations due to classical transmission corridors and inadequate controllers’ deployment. The necessity of system regulations demands an adequate controller for matching the power requirement variability and this has been demonstrated with STATCOM control feature. This controller enhances the Available Transfer Capability along with security and reliability. IEEE 14 Bus system is simulated and studied with various scenarios with the help of MATLAB and PSAT to identify various complexities and to resolve these issues so as to enhance the ATC, reliability and security
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.
Improved Power Quality by using STATCOM Under Various Loading ConditionsIJMTST Journal
A Power quality problem is an occurrence manifested as a nonstandard voltage, current or frequency that
results in a failure or a mis-operation of end user equipment’s. Utility distribution networks, sensitive
industrial loads and critical commercial operations suffer from various types of outages and service
interruptions which can cost significant financial losses. 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. Injection of the wind power into an electric grid affects the power quality. The
performance of the wind turbine and thereby power quality are determined on the basis of measurements
and the norms followed according to the guideline specified in International Electro-technical Commission
standard, IEC-61400. The influence of the wind turbine in the grid system concerning the power quality
measurements are-the active power, reactive power, variation of voltage, flicker, harmonics, and electrical
behavior of switching operation and these are measured according to national/international guidelines.
Static Compensator (STATCOM) is connected at a point of common coupling with a battery energy storage
system (BESS) to mitigate the power quality issues. The battery energy storage is integrated to sustain the
real power source under fluctuating wind power. Here two control schemes for STATCOM are Fuzzy logic
controller and hybrid Fuzzy logic controller. We can better response for hybrid fuzzy compare to fuzzy logic
controller. The STATCOM control scheme for the grid connected wind energy generation system for power
quality improvement is simulated using MATLAB/SIMULINK in power system block set. Finally the proposed
scheme is applied for both balanced and unbalanced linear nonlinear loads.
1.compensation of reactive power using d statcom in grid interfaced pv systemEditorJST
This paper displays the upgrade of voltage droops, Harmonic mutilation and low power figure utilizing Distribution Static Compensator (D-STATCOM) with LCL Passive Filter in Distribution Framework. At whatever point there is an entrance of photovoltaic cell energy to the low voltage appropriated matrix, there happen the issue of confuse in voltage and recurrence in the system, maybe brought on by non-direct loads, creating music. The model depends on the Voltage Source Converter (VSC) guideline. The D-STATCOM infuses a current into the framework to alleviate the voltage lists. LCL Passive Filter Was then added to D-STATCOM to enhance symphonies bending and low power figure. The reproductions were performed utilizing MATLAB SIMULINK.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
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Student information management system project report ii.pdfKamal Acharya
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Voltage Flicker Mitigation of Wind Farm Using a STATCOM
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Development
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Scientific Journal of Impact Factor(SJIF): 3.134
e-ISSN(O): 2348-4470
p-ISSN(P): 2348-6406
Voltage Flicker Mitigation of Wind Farm Using a STATCOM
Maneesh Pandey1
, Dr. S. K. Srivastava2
1,2
Department of Electrical Engineering,Madan Mohan Malviya University of Technology,Gorakhpur, UP, India
Abstract—this paper investigates the use of static synchronous compensator (STATCOM) to mitigate the voltage
flickers or voltage fluctuations of wind farm equipped with wind turbine driving squirrel cage induction generators.
60MW wind turbine generator system is connected to grid through step up transformer and transmission line.
Conventional PI control scheme is adopted for controlling of STATCOM. The MATLAB based simulation result shows
that STATCOM significantly reduces the voltage flickers caused by wind speed variation and enhance the power quality
of the system.
Index Terms-- static synchronous compensator (STATCOM); wind farm; induction generator; voltage control; system
stability.
I. INTRODUCTION
Wind energy is indirect form of solar energy. Wind is generated due to unequal heating of earth surface and water,
thus wind is geographically and climatically uncontrollable source of green energy. These days due to technology
advancement and cost reduction, wind energy has become the fastest growing renewable source of energy [1].
Wind turbine produces active power with significant fluctuations due to wind speed variation [3]. The electrical power
output of wind turbine is directly proportional to cube of the wind speed. Thus small change in wind speed causes the
major disturbance in the power output of wind farm. These power fluctuation causes voltage flickers or voltage
fluctuations. Because of power quality requirement from the utilities these voltage flickers must be mitigated as soon as
possible. If voltage flickers increases beyond the prescribe limit, the wind farm is disconnected from the grid.
Voltage flicker mitigation can be achieved by using dynamic reactive compensation. The most co mmonly used
dynamic reactive compensators are STATCOM and static Var compensator (SVC) [3]. The STATCOM has several
advantages over SVC. STATCOM has faster response time (1-2 cycles) and superior voltage support capability.
STATCOM provides systemvoltage support by supplying or absorbing active power into system[6].
In this paper, we studies the use of static synchronous compensator (STATCOM) in wind farm enhancing voltage
regulation, reactive power control and voltage flicker mitigation. PI control scheme is used for controlling purpose of
STATCOM. The simulation results are carried out in MATLAB to examine the performance of wind farm, with and
without use of STATCOM.
II. SYSTEM DESCRIPTION
Single line diagram of wind farm system is shown in fig.1. A 60 MW wind farm is connected to grid through step up
transformer and transmission network of 200 Km. To reduce the voltage fluctuation and improve the power factor of
overall system compensating capacitor is connected near the wind farm at 11 KV bus, it provides 23 MVar reactive
power to the system. However because of slow response time of these devices, do not satisfactorily address the dynamic
issues of wind farm. A 30 MVar STATCOM is used as a dynamic reactive compensator and it is connected at 132 KV
bus.
Figure 1. Single line diagram of wind farm energy systemconnected to grid
The parameters of system components are as follows. Lumped SCIG: rated power = 60 MW, rated stator voltage =
11KV, stator resistance = 0.0108pu, rotor resistance = 0.01214 pu, stator leakage inductance = 0.107 pu, rotor leakage
2. International Journal of Advance Engineering and Research Development (IJAERD)
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inductance = 0.1407 pu, mutual inductance = 4.4 pu, lumped inertia constant 3s; Transformer T1: turns ratio = 11/132
KV, equivalent leakage inductance = 0.025 pu; STATCOM: DC link capacitor = 300µF, DC link voltage = 40 KV.
III. WIND FARM MODELING
Wind farm consists of number of wind turbine, SCIG set grouped together at a location to produce the electricity. In
wind turbine energy generation system squirrel cage induction generator driven by a wind turbine through a mechanical
shaft system and operate at a certain wind speed. Gear box connects the low speed wind turbine shaft to the high speed
IGshaft
The mechanical power produced by a wind turbine is given by
𝑃𝑤 =
1
2
𝜌𝐴𝑟 𝑉𝑤
3
𝐶 𝑝(𝜆, 𝛽) (1)
Where 𝜌 is the air density in kg/ 𝑚3
, 𝐴𝑟 is the blade impact area in 𝑚3
, 𝑉𝑤 is the wind velocity in m/s and 𝐶 𝑝 is the power
coefficient of the employed wind turbine [9].
From eq. 1 the relation between power output and wind speed can be easily understood.
IV. STATCOM MODELLING
The STATCOM consists of a VSC and a storage capacitor connected in shunt to a system bus through coupling
transformer. The six pulse PWM IGBT VSC model is shown in fig. 2. The purpose of STATCOM in system to get fast
and smooth voltage control, this is why IGBT based VSC is used in STATCOM model [3]. The inductance connected in
all three branches to eliminate the high frequency harmonics in VSC AC side current.
Figure 2. Six pulse PWM IGBT VSC model
The basic equivalent circuit of STATCOM is shown in fig. 3. Where 𝑉𝑐 is VSC output voltage and V is rms value of
AC system bus. If V and 𝑉𝑐 equal in magnitude and phase no reactive power exchange take place between STATCOM
and line. Due to the disturbances, if magnitude of V become lower than 𝑉𝑐 , reactive power is supplied by STATCOM to
line, until unless it reaches to its normal value. The amount of reactive power supplied is given by-
𝑄 𝑐 =
𝑉(𝑉𝑐 −𝑉)
𝑋 𝑇
(2)
If the magnitude of V become higher than 𝑉𝑐 , reactive power is absorbed by STATCOM from the line. Thus
STATCOM provide better reactive power control to the systemconnected.
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Figure 3 Basic circuit of STATCOM
V. SIMULATION RESULTS
Fig. 4 shows the wind speed variation with time. Wind speed is varied range from 5-13 m/s with average value of 10
m/s. Wind speed variations applied for 12 seconds. When these wind speed variations are subjected to wind turbine, it
causes power fluctuations. These power fluctuation results voltage flickers which are clearly shown in fig 5.
Figure 4. Wind speed variations for 12 sec
Figure 5. Voltage fluctuations due to wind speed variation (without STATCOM)
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Figure 6. Voltage profile with STATCOM
Figure 7. Reactive power supplied by STATCOM
Fig. 5 shows the voltage magnitude wave form (with respect to time) without using any dynamic reactive compensator
(STATCOM). It is clearly visible that voltage fluctuations are significantly high. The magnitude voltage varies from 91
% to 103 % of its base value (ie. 1 pu). These voltage fluctuations do not obey the power quality requirement from
utilities. These fluctuations may have adverse effect on weak power systemnetwork connected.
Voltage fluctuations are significantly reduced with the application of STATCOM in the system, which can be clearly
seen from fig. 6. The voltage fluctuations are mitigated to range of value 0.99-1.005 pu (ie. -1 % to +0.5 %). Thus the
overall power quality of the system has improved. STATCOM supply or absorb the reactive power, according to system
requirement. If voltage goes below base value, STATCOM supplying reactive power and vise versa, it could be clea rly
seen from fig. 7.
VII. CONCLUSIONS
Wind is climatically and geographically uncontrollable source of renewable energy. Wind speed variation causes
voltage flickers or voltage fluctuations. These voltage fluctuations could not be taken care by using fixed capacitive
compensation, alone. To rectify these power quality issues dynamic reactive compensators (STATCOM) are used.
STATCOM has very fast time response characteristics, due to which, voltage fluctuations mitigation can be achieved
effectively. The reactive power supplied by STATCOM varies with the voltage fluctuation level. Thus it can say that,
wind farm power quality can be enhanced by using STATCOM.
VII. REFERENCES
[1] Chong Han, Alex Q. Huang, Wayne Litzenberger, Loren Anderson, Abdel-Aty Edris Mesut Baran, and
Subhashish Bhattacharya “ STATCOM Impact Study on the Integration of a Large Wind Farm into a Weak
Loop Power System” IEEE transactions on energy conversion, vol. 23, NO. 1, march 2008.
[2] T. Ackermann, Wind Power in Power Systems. New York:Wiley, 2005.
[3] Wei Qiao and Ronald G. Harley, “Power Quality and Dynamic Performance Improvement of Wind Farms
Using a STATCOM” 2007 IEEE
[4] Zhu xueling, Zhang Yang, Gao Kun, Li Qiang, Du Xizhou, and Liu Tonghe, "Research on compensation of
reactive power for wind farms", Power Sysetem Protection and Control, vol. 37, pp68-76, 2009.
[5] Lie Xu, Liangzhong Yao, and Christian Sasse “Comparison of Using SVC and STATCOM for Wind Farm
Integration” 2006 International Conference on Power SystemTechnology.
[6] Zengqiang Mi, Yingjin Chen, Liqing Liu, Yang Yu “Dynamic Performance Improvement of Wind Farm with
Doubly Fed Induction Generators Using STATCOM” 2010 International Conference on Power System
Technology.
[7] J. W. Smith, D. L. Brook, “Voltage impacts of distributed wind generation on rural distribution feeders,” IEEE
PES TDCE, vol. 1, pp. 492- 497, 28 Oct.-2 Nov 2001.
[8] A. Kehrli, M. Ross, “Understanding grid integration issues at wind farms and solutions using voltage source
converter FACTS technology,” IEEE PES general meeting, vol. 3, pp. 1822 - 1827, July 2003.
5. International Journal of Advance Engineering and Research Development (IJAERD)
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[9] Chi Yongning, "Studies on the Stability Issues about Large Scale Wind Farm Grid Integration," D.E.
dissertation, Dept. China Electric Power Research Institute, 2006.E. H. Miller, "A note on reflector arrays,"
IEEE Trans. Antennas Propagat., to be published.
[10] Mohammad Ilyas, Mohammad Ubaid Soherwardi “STATCOM for improvement of dynamic performance of
wind farms in power grid” IJMER may 2014.
[11] Pooler M.A., "Doubly-fed induction machine models for stability assessment of wind farms," in Proc. 2003
IEEE Int. Power Tech Conf, Italy
[12] D. Santos-Martin, S. Arnaltes, and J.L. Rodriguez Amenedo, "Reactive power capability of doubly fed
asynchronous generators," Electric Power Systems Research, vol. 78, pp. 1837-1840, Nov. 2008
[13] Yan Gangui, Wang Maochun, and Mugang, "Modeling of GridConnected Doubly-Fed Induction Generator for
Reactive Power Static Regulation Capacity Study," Transactions of China Electrotechnical SOCiety, vol. 23, pp.
98-104, Jul. 2008
[14] Lei Sun, Zengqiang Mi, Yang Yu, Tao Wu, and Haifeng Tian, "Active power and reactive power regulation
capacity study of DFIG wind turbine", in Sustainable Power Generation and Supply, 2009.SUPERGEN '09.
International Conference, ppl-6, 2009
[15] A. Larsson,“Flicker emission of wind turbines during continuous operation,” IEEE Trans. Energy Conversion,
vol. 17, No. 1, pp. 114- 118, Mar. 2002.
[16] S. Sirisukprasert, A. Q. Huang, J. S. Lai “Modeling, analysis and control of cascaded multilevel converter based
STATCOM,” IEEE PES general meeting, vol. 4, pp. 2561 - 2568, July 2003
[17] F. Zhou, G. Joos, C. Abbey,“Voltage stability in weak connection wind farms,” IEEE PES general meeting, pp.
610 - 615, June 2005.
[18] L. T. Ha, T. K. Saha,“Investigation of power loss and voltage stability limits for large wind farm connections to
a subtransmission network,” IEEE PES general meeting, vol.2, pp. 2251 - 2256, June 2004.
VII. BIOGRAPHIES
Maneesh Pandey was born in 1990 in Chitrakoot, Uttar Pradesh, India. He received his
B.Tech (Hons.) degree in Electrical and Electronics Engineering from Vishveshwarya Institute
of Engineering And Technology in 2012. Now he is a Master’s student in Electrical
Engineering department at Madan Mohan Malviya University of Technology. His area of
intertest include power electronics, power system wide area protection and wind energy
generation system.
Dr. S.K Srivastava received his M. Tech. and Ph.D degrees from I.I.T Delhi (India) and U.P
Technical University Lucknow (India) in the year 1993 and 2008 respectively. Presently, he is
working as Associate Professor in the Department of Electrical Engineering of M.M.M
University of Technology Gorakhpur (U.P), India. His research interest includes power system
operation and control, Power Quality, FACTS devices & Controllers, Restructured Electricity
Market, Fuzzy & Neural applications in power systemproblems.