The document describes modeling and analysis of an automatic voltage regulator (AVR), power system stabilizer (PSS), and unified power flow controller (UPFC) in a single machine infinite bus (SMIB) power system to enhance transient stability and improve power transfer capability. Case studies are conducted by changing the reference voltage, infinity bus voltage, mechanical torque, and introducing faults. The responses of rotor angle, slip, excitation voltage, and electrical torque are simulated. The control strategies of UPFC include phase voltage control, quadrature voltage control, quadrature current control, and real current control, except for phase angle control. Modeling equations are provided for the generator, AVR, PSS, and UPFC and their control strategies.
This paper presents a method to improve transient stability and damping of low frequency oscillations in a multi-machine power system using adaptive neuro-fuzzy control of FACTS devices. A Simulink model of a three generator power system equipped with a UPFC is developed. Simulation results show that a UPFC controlled using an adaptive neuro-fuzzy inference system controller more effectively improves transient stability and damps power oscillations compared to using SSSC. The neuro-fuzzy controller is trained using a hybrid learning algorithm to tune its parameters online based on generator speed deviation and acceleration as inputs.
TRANSIENT STABILITY ENHANCEMENT BY USING DSSC AND PSSIAEME Publication
Synchronous operation of generators in power system is required to supply continuous electricity to customers. Proper transient stability must be maintained for stable operation of power system. To enhance the transient stability of power system FACTS or D-FACTS technology can be used. In this paper, Distributed Static Series Compensator (DSSC) which, belongs to D-FACTS technology is used to enhance the transient stability of two-machine system with Power System Stabilizer (PSS) as an auxiliary controller and it is found that DSSC along with PSS is able to maintain required transient stability during severe three-phase to ground fault.
Transient stability in power system is vital to be addressed due to large disturbances that could damage the system such as load changes and voltage increases. This paper presents a multi-machine transient stability using the Static Synchronous Series Compensator (SSSC). SSSC is a device that is connected in series with the power transmission line and produces controllable voltage which contribute to a better performance in the power system stability. As a result, this research has observed a comparison of the synchronization of a three-phase system during single-phase faults before and after installing the SSSC device. In addition, this research investigates the ability of three different types of controllers i.e. Proportional Integral (PI), Proportional Integral Derivation (PID), and Generic controllers to be added to the SSSC improve the transient stability as it cannot operate by itself. This is because the improvement is too small and not able to achieve the desired output. The task presented is to improve the synchronization of the system and time taken for the voltage to stabilize due to the fault. The simulation result shows that the SSSC with an additional controller can improve the stability of a multi-machine power system in a single phase fault.
This document summarizes research into improving transient stability in power transmission systems using a Static VAR Compensator (SVC) with a hybrid PI-Fuzzy Logic controller. It begins with an introduction to Flexible AC Transmission Systems (FACTS) and the role of SVC devices in voltage control and reactive power compensation. It then describes modeling an SVC and the operating principles of conventional PI control. The limitations of PI control for nonlinear systems are discussed. The document proposes a hybrid PI-Fuzzy Logic controller to combine the advantages of both. Simulation results using MATLAB on a 2-machine 3-bus test system show the hybrid controller improves performance during disturbances over PI or Fuzzy Logic control alone.
Voltage profile Improvement Using Static Synchronous Compensator STATCOMINFOGAIN PUBLICATION
Static synchronous compensator (STATCOM) is a regulating device used in AC transmission systems as a source or a sink of reactive power. The most widely utilization of the STATCOM is in enhancing the voltage stability of the transmission line. A voltage regulator is a FACTs device used to adjust the voltage disturbance by injecting a controllable voltage into the system. This paper implement Nruro-Fuzzy controller to control the STATCOM to improve the voltage profile of the power network. The controller has been simulated for some kinds of disturbances and the results show improvements in voltage profile of the system. The performance of STATCOM with its controller was very close within 98% of the nominal value of the busbar voltage.
Static Sustenance of Power System Stability Using FLC Based UPFC in SMIB Powe...IJMER
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.
Comparative Analysis of Power System Stabilizer using Artificial Intelligence...ijsrd.com
This document compares the performance of conventional, fuzzy logic-based, and neural network-based power system stabilizers (PSS) for a single machine infinite bus system. It first describes the system model and components. It then explains the design of the conventional PSS and its limitations. Next, it details the design of fuzzy logic-based and neural network-based PSS using speed deviation and acceleration as inputs. Simulation results show that the neural network PSS provides the best damping of oscillations following a disturbance, settling faster than the fuzzy logic or conventional PSS. The document concludes the neural network PSS has the best dynamic performance for stabilizing the power system.
Steady state stability analysis and enhancement of three machine nine bus pow...eSAT Journals
This document presents an analysis of steady state stability for the IEEE 3-machine 9-bus test power system. It first describes the mathematical modeling of the system using linearization and state space representation. Eigenvalue analysis shows the system is purely oscillatory without damping. A thyristor controlled phase shifter (TCPS) FACTS device-based controller is then modeled to enhance stability. The system is analyzed with and without the controller. Results show the controller provides damping, improving stability as seen in eigenvalue analysis and time domain simulations following a disturbance.
This paper presents a method to improve transient stability and damping of low frequency oscillations in a multi-machine power system using adaptive neuro-fuzzy control of FACTS devices. A Simulink model of a three generator power system equipped with a UPFC is developed. Simulation results show that a UPFC controlled using an adaptive neuro-fuzzy inference system controller more effectively improves transient stability and damps power oscillations compared to using SSSC. The neuro-fuzzy controller is trained using a hybrid learning algorithm to tune its parameters online based on generator speed deviation and acceleration as inputs.
TRANSIENT STABILITY ENHANCEMENT BY USING DSSC AND PSSIAEME Publication
Synchronous operation of generators in power system is required to supply continuous electricity to customers. Proper transient stability must be maintained for stable operation of power system. To enhance the transient stability of power system FACTS or D-FACTS technology can be used. In this paper, Distributed Static Series Compensator (DSSC) which, belongs to D-FACTS technology is used to enhance the transient stability of two-machine system with Power System Stabilizer (PSS) as an auxiliary controller and it is found that DSSC along with PSS is able to maintain required transient stability during severe three-phase to ground fault.
Transient stability in power system is vital to be addressed due to large disturbances that could damage the system such as load changes and voltage increases. This paper presents a multi-machine transient stability using the Static Synchronous Series Compensator (SSSC). SSSC is a device that is connected in series with the power transmission line and produces controllable voltage which contribute to a better performance in the power system stability. As a result, this research has observed a comparison of the synchronization of a three-phase system during single-phase faults before and after installing the SSSC device. In addition, this research investigates the ability of three different types of controllers i.e. Proportional Integral (PI), Proportional Integral Derivation (PID), and Generic controllers to be added to the SSSC improve the transient stability as it cannot operate by itself. This is because the improvement is too small and not able to achieve the desired output. The task presented is to improve the synchronization of the system and time taken for the voltage to stabilize due to the fault. The simulation result shows that the SSSC with an additional controller can improve the stability of a multi-machine power system in a single phase fault.
This document summarizes research into improving transient stability in power transmission systems using a Static VAR Compensator (SVC) with a hybrid PI-Fuzzy Logic controller. It begins with an introduction to Flexible AC Transmission Systems (FACTS) and the role of SVC devices in voltage control and reactive power compensation. It then describes modeling an SVC and the operating principles of conventional PI control. The limitations of PI control for nonlinear systems are discussed. The document proposes a hybrid PI-Fuzzy Logic controller to combine the advantages of both. Simulation results using MATLAB on a 2-machine 3-bus test system show the hybrid controller improves performance during disturbances over PI or Fuzzy Logic control alone.
Voltage profile Improvement Using Static Synchronous Compensator STATCOMINFOGAIN PUBLICATION
Static synchronous compensator (STATCOM) is a regulating device used in AC transmission systems as a source or a sink of reactive power. The most widely utilization of the STATCOM is in enhancing the voltage stability of the transmission line. A voltage regulator is a FACTs device used to adjust the voltage disturbance by injecting a controllable voltage into the system. This paper implement Nruro-Fuzzy controller to control the STATCOM to improve the voltage profile of the power network. The controller has been simulated for some kinds of disturbances and the results show improvements in voltage profile of the system. The performance of STATCOM with its controller was very close within 98% of the nominal value of the busbar voltage.
Static Sustenance of Power System Stability Using FLC Based UPFC in SMIB Powe...IJMER
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.
Comparative Analysis of Power System Stabilizer using Artificial Intelligence...ijsrd.com
This document compares the performance of conventional, fuzzy logic-based, and neural network-based power system stabilizers (PSS) for a single machine infinite bus system. It first describes the system model and components. It then explains the design of the conventional PSS and its limitations. Next, it details the design of fuzzy logic-based and neural network-based PSS using speed deviation and acceleration as inputs. Simulation results show that the neural network PSS provides the best damping of oscillations following a disturbance, settling faster than the fuzzy logic or conventional PSS. The document concludes the neural network PSS has the best dynamic performance for stabilizing the power system.
Steady state stability analysis and enhancement of three machine nine bus pow...eSAT Journals
This document presents an analysis of steady state stability for the IEEE 3-machine 9-bus test power system. It first describes the mathematical modeling of the system using linearization and state space representation. Eigenvalue analysis shows the system is purely oscillatory without damping. A thyristor controlled phase shifter (TCPS) FACTS device-based controller is then modeled to enhance stability. The system is analyzed with and without the controller. Results show the controller provides damping, improving stability as seen in eigenvalue analysis and time domain simulations following a disturbance.
Power factor improvement in switched reluctance motor drive using pwmIAEME Publication
This document discusses improving the power factor of a switched reluctance motor (SRM) drive system by using a three-level pulse width modulation (PWM) converter. A conventional SRM drive using a diode bridge rectifier produces high current harmonics and a poor power factor. The proposed system uses a PWM converter as the front-end converter to improve the power factor at the AC mains supply with low current harmonics. The performance of the proposed SRM drive system with the PWM converter is modeled and simulated in Matlab/Simulink. The results show the system is capable of improving the power factor close to unity while meeting IEEE standards for total harmonic distortion and power quality.
This document presents a study on using a fuzzy logic controlled D-STATCOM (distributed static compensator) to improve power quality in a power distribution system. A D-STATCOM equipped with an LCL passive filter is modeled and connected in parallel to an 11kV distribution system. Fuzzy logic control is implemented to regulate the D-STATCOM's reactive power injection and compensate for voltage sags and total harmonic distortion. Simulation results show the D-STATCOM improves the voltage profile under different fault conditions and reduces current THD from 43.43% to 0.73% when the LCL filter is used. The paper concludes the D-STATCOM effectively mitigates voltage sags and enhances power quality in the distribution
Real-Time simulation of static synchronous condenser for compensation of reac...IJECEIAES
This paper presents a real time simulation stability of power system by static synchronous compensator (STATCOM), also known as astatic synchronous condenser (STATCON) in modern platform real-time simulator named (RT-LAB) using the latest INTEL quad-core processors to simulate a relatively large power system In our work, We have to study the problem of controlling voltage and reactive power in electric system by STATCOM. All the simulations for the above work have been carried out using MATLAB/Simulink and RT-LAB. Various simulations have given very satisfactory results and we have successfully improved the voltage by injecting a FACTS device, which is the STATCOM, the Studies and comparisons of real-time simulation results of the power system without and with STATCOM connected illustrate the effectiveness and capability of STATCOM in improving voltage stability in the power system.
Transient Stability Evaluation of the Power Generation under a Blackout Condi...theijes
An operational condition of a power system is able to affect to stability performances after disturbed by a certain fault on the interconnection system. Moreover, this fault also gives impact to the blackout situation created by a large disturbance as disconnecting back bone lines of the interconnection system. In detail, this case is presented in this paper for evaluating transient stability performances of generating units while producing energy for the load center online the power system operation with the blackout situation designed using a branch tripping method. Furthermore, the transient stability responses are subjected to the power generation of the electric power system in Malang Raya as a real system operation for interacting the generating and demand sites. Results obtained show that voltage changes of Wlingi power station is 0.944 pu to 0.946 pu and its overshoot is 0,962. But the other overshoot of the power generation in Sutami remained to 0.968 pu at 0.5 second after appearing a blackout fault and its voltage increase to 0.952 pu from 0.948 pu at the final stable position.
Transient stability analysis on a multi machine system in psateSAT Journals
Abstract
Modern power system are subject to large disturbances such as three phase short circuit faults. When a fault occurs on a system
the generators rotor angle becomes unstable and thus it losses synchronism with the system and it becomes unstable. Thus
transient stability analysis can be performed on a system in order to understand the generators performance when subjected to a
short circuit fault. When the system is subjected to a fault the generator experiences transient oscillations in rotor speed and
angle which can be effectively suppressed with the incorporation of Automatic Voltage Regulator (AVR) and Power System
Stabilizer (PSS). The simulations have been performed using the MATLAB/PSAT software.
Keywords—Transient stability, Three phase fault Faults, AVR, PSS.
Voltage recovery of induction generator using indirect torque control methodiaemedu
1) The document discusses using a STATCOM to indirectly control the torque of an induction generator connected to the grid through voltage modulation in order to improve voltage recovery following a fault.
2) It proposes an indirect torque control method where the STATCOM controls the generator's terminal voltage during recovery to limit torque and smooth transients.
3) Time-domain simulations show that indirect torque control with STATCOM successfully limits the peak torque and speeds recovery of the generator's voltage, speed, and torque following a three-phase fault.
Voltage profile Improvement Using Static Synchronous Compensator STATCOMINFOGAIN PUBLICATION
Static synchronous compensator (STATCOM) is a regulating device used in AC transmission systems as a source or a sink of reactive power. The most widely utilization of the STATCOM is in enhancing the voltage stability of the transmission line. A voltage regulator is a FACTs device used to adjust the voltage disturbance by injecting a controllable voltage into the system. This paper implement Nruro-Fuzzy controller to control the STATCOM to improve the voltage profile of the power network. The controller has been simulated for some kinds of disturbances and the results show improvements in voltage profile of the system. The performance of STATCOM with its controller was very close within 98% of the nominal value of the busbar voltage.
This document provides an overview of power system stability analysis. It defines power system stability as the ability of a system to maintain equilibrium during normal operation and regain equilibrium after disturbances. It discusses different types of stability including rotor angle stability and voltage stability. Key factors that influence stability like operating conditions, faults, and clearing times are also summarized. Methods for enhancing stability such as high-speed fault clearing and controlled load shedding are briefly mentioned. Models for analyzing stability like the swing equation and equal area criterion are defined in less than 3 sentences.
FLC based on static var compensator for power system transient stability enha...TELKOMNIKA JOURNAL
1. The document discusses using a fuzzy logic controller combined with a PI controller to control a static var compensator (SVC) for improving power system transient stability.
2. A two generator, three bus test system is used to compare the performance of the fuzzy-SVC controller versus a conventional PI-SVC controller under different fault conditions.
3. Simulation results show that for a single line to ground fault, both controllers perform similarly. However, for a more severe three line to ground fault, the fuzzy-SVC controller is able to damp oscillations faster and achieve stability more quickly than the PI-SVC controller due to its ability to handle nonlinear system dynamics.
Tuning of PI and PID Controller with STATCOM, SSSC and UPFC for Minimizing Da...IOSRJEEE
This paper presents the comparative performance of directly and feedback connected PI and PID controller scheme with Flexible AC Transmission System (FACTS) devices, such as Static Synchronous Compensator (STATCOM), Static Synchronous Series Compensator (SSSC) and Unified Power Flow Controller (UPFC) in terms of improvements in transient stability, extenuation of system oscillations and furnishing voltage support in single machine infinite bus system (SMIB). Firstly, rotor angle deviation and speed deviation analyzed for directly connected PI and PID with UPFC, SSSC and STATCOM then for feedback connected. The comparisons of all the results are performed using Matlab simulink in term of maximum overshoot and settling time.
The aim of this paper is to prove that fuzzy logic algorithm is a suitable control technique for fast processes such as electrical machines. This theory has been experimented on different kinds of electrical machines such as stepping motors, dc motors and induction machines (with 6 phases) and the experimental results show that the proposed fuzzy logic algorithm is the most suitable control technique for electrical machines since this algorithm is not time consuming and it is also robust between plant parameters variations.
Review of Improved Direct Torque Control Methodologies for Induction Motor Dr...AM Publications
ecoupled control of induction motor drives is possible using Direct Torque Control (DTC) method which
is very simple control strategy compared to field oriented control. In this method direct torque control is achieved by
selecting suitable inverter switching voltage vector from a lookup table. But drawback of this method is that it
produces toque ripples. Also the switching frequency of inverter switches is not constant. Many methods have been
proposed to address these issues of DTC. This paper reviews various methodologies which are suggested to improve
performance of basic DTC induction motor drive.
Basically, the direct torque control (DTC) drive system is operated at light load. At light load, supplying the drive system with rated flux will decrease the efficiency of the system. To maximize the efficiency of drive system, an optimal flux has been applied during steady-state but when a torque is suddenly needed, for example during acceleration, the dynamic of the torque response would be degraded. Therefore, a modification to the voltage vector as well as look-up table has been proposed for the torque response improvement. The proposed voltage vector is generated by adding two adjacent conventional voltage vectors and implemented by using duty ratio. The duty ratio is used to estimate the activation time of each conventional voltage vector in order to produce the proposed voltage vector.
This document summarizes a research paper that models, simulates, and analyzes the performance of a variable frequency drive (VFD) for speed control of an induction motor. The summary is:
1) A VFD controls the speed of an induction motor by varying the frequency of the applied AC voltage using pulse width modulation. This allows variable motor speed control needed in some industrial applications.
2) The paper models the key components of a VFD - the rectifier, DC bus, and inverter - and models the induction motor in a dq reference frame.
3) Simulation results in Matlab/Simulink successfully demonstrate speed control of the induction motor from zero to nominal speed by varying the drive
This document describes a control strategy for a PWM voltage source converter (PWM-VSC) using fuzzy logic to provide variable DC voltage for controlling the speed of a DC motor. A fuzzy logic controller is proposed to minimize errors in the DC voltage and stabilize it by regulating the amplitude of the network current. Simulation results show the fuzzy logic controller produces a stable DC voltage without overshoot to drive the DC motor, with less than 5% total harmonic distortion in the network current and a power factor near unity. The DC motor speed is also stable without overshoot in response to variations in the controlled DC voltage.
The document describes the design, simulation, implementation and control of a PLC-based integral cycle controller for resistance spot welding applications. Some key points:
1) An integral cycle controller provides power to a load by passing full voltage cycles on for a set number of cycles, then off for the remaining cycles, varying the duty cycle to control output power.
2) A simulation of an integral cycle controller was developed in MATLAB to analyze output waveforms and harmonic profiles for different duty cycles.
3) The integral cycle controller was designed using a PLC to provide flexible control and implemented for resistance spot welding, which benefits from integral cycle control's ability to minimize harmonics compared to phase control.
Performance evaluation of different structures of power system stabilizers IJECEIAES
The electric power from the system should be reliable and economical for consumer’s equipment satisfaction. An electric power system consists of many generators, transformers, transmission lines, loads, etc. For the power system network, dynamic performance and stability are important. The system is lost its stability by some disturbances i.e., load variations, generator failure, prime mover failure, transmission line outage, etc. Whenever load variations in the system, generator rotor speed will vary, means oscillations in the rotor speed, which is deviating from rated speed. The excitation system will control the generator rated line voltage. When fault occurs at any equipment in the system, the system will unstable. If fault occurs at generator, the generator oscillates. To reduce the oscillations and to make the system stable used power system stabilizers (PSS’s). Here, three types of PSS’s are used i.e., PSS1B, PSS2B, PSS4B. Comparisons of three PSS’s are on the multi machine system under some disturbance. From the observations, concluding that PSS4B is quickly control the oscillations in the physical parameters of machine in the system than other power system stabilizers.
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.
Direct Torque Control of Induction Motor Drive Fed from a Photovoltaic Multil...IJERA Editor
This paper presents Direct Torque Control (DTC) using Space Vector Modulation (SVM) for an induction motor drive fed from a photovoltaic multilevel inverter (PV-MLI). The system consists of two main parts PV DC power supply (PVDC) and MLI. The PVDC is used to generate DC isolated sources with certain ratios suitable for the adopted MLI. Beside the hardware system, the control system which uses the torque and speed estimation to control the load angle and to obtain the appropriate flux vector trajectory from which the voltage vector is directly derived based on direct torque control methods. The voltage vector is then generated by a hybrid multilevel inverter by employing space vector modulation (SVM). The inverter high quality output voltage which leads to a high quality IM performances. Besides, the MLI switching losses is very low due to most of the power cell switches are operating at nearly fundamental frequency. Some selected simulation results are presented for system validation.
POWER QUALITY IMPROVEMENT BY SSSC AND STATCOM USING PI CONTROLLERJournal For Research
This document summarizes research on using SSSC (Static Synchronous Series Compensator) and STATCOM (Static Synchronous Compensator) to improve power quality and voltage stability in a two machine, four bus power system model. It describes the basic operational principles of SSSC and STATCOM, which are FACTS devices that can be connected in series and parallel, respectively, with transmission lines. The document presents simulation results showing that connecting an SSSC to Bus 2 and a STATCOM to Bus 2 both increase the voltage levels and regulate active and reactive power flows at the different buses, demonstrating the effectiveness of these devices for maintaining voltage stability.
Influencing Power Flow and Transient Stability by Static Synchronous Series C...ijeei-iaes
This document summarizes research on using a Static Synchronous Series Compensator (SSSC) to improve power flow and transient stability in a Single Machine Infinite Bus (SMIB) system. The research models an SMIB system and analyzes its power angle curve and transient stability both with and without an SSSC. Results show that the SSSC is effective at stabilizing the system after a transient fault by controlling voltage injection and virtual line impedance. The SSSC allows the system to regain stability faster than without the SSSC. Therefore, the SSSC is concluded to be an effective means of influencing power flow and improving transient stability in power systems.
IRJET- Vector Control of Three Phase Induction MotorIRJET Journal
This document discusses vector control of a three-phase induction motor. Vector control, also called field-oriented control, allows independent control of torque and flux in induction motors, similar to DC motors. The document describes:
1) How vector control works by transforming stator currents into orthogonal d-q components representing flux and torque.
2) The principle of field-oriented control which locks the d-q reference frame to the rotor flux vector for decoupled control of flux and torque.
3) The simulation model built in MATLAB/Simulink to test vector control, including blocks for Clarke/Park transformations, current control, and a PI speed controller.
Power factor improvement in switched reluctance motor drive using pwmIAEME Publication
This document discusses improving the power factor of a switched reluctance motor (SRM) drive system by using a three-level pulse width modulation (PWM) converter. A conventional SRM drive using a diode bridge rectifier produces high current harmonics and a poor power factor. The proposed system uses a PWM converter as the front-end converter to improve the power factor at the AC mains supply with low current harmonics. The performance of the proposed SRM drive system with the PWM converter is modeled and simulated in Matlab/Simulink. The results show the system is capable of improving the power factor close to unity while meeting IEEE standards for total harmonic distortion and power quality.
This document presents a study on using a fuzzy logic controlled D-STATCOM (distributed static compensator) to improve power quality in a power distribution system. A D-STATCOM equipped with an LCL passive filter is modeled and connected in parallel to an 11kV distribution system. Fuzzy logic control is implemented to regulate the D-STATCOM's reactive power injection and compensate for voltage sags and total harmonic distortion. Simulation results show the D-STATCOM improves the voltage profile under different fault conditions and reduces current THD from 43.43% to 0.73% when the LCL filter is used. The paper concludes the D-STATCOM effectively mitigates voltage sags and enhances power quality in the distribution
Real-Time simulation of static synchronous condenser for compensation of reac...IJECEIAES
This paper presents a real time simulation stability of power system by static synchronous compensator (STATCOM), also known as astatic synchronous condenser (STATCON) in modern platform real-time simulator named (RT-LAB) using the latest INTEL quad-core processors to simulate a relatively large power system In our work, We have to study the problem of controlling voltage and reactive power in electric system by STATCOM. All the simulations for the above work have been carried out using MATLAB/Simulink and RT-LAB. Various simulations have given very satisfactory results and we have successfully improved the voltage by injecting a FACTS device, which is the STATCOM, the Studies and comparisons of real-time simulation results of the power system without and with STATCOM connected illustrate the effectiveness and capability of STATCOM in improving voltage stability in the power system.
Transient Stability Evaluation of the Power Generation under a Blackout Condi...theijes
An operational condition of a power system is able to affect to stability performances after disturbed by a certain fault on the interconnection system. Moreover, this fault also gives impact to the blackout situation created by a large disturbance as disconnecting back bone lines of the interconnection system. In detail, this case is presented in this paper for evaluating transient stability performances of generating units while producing energy for the load center online the power system operation with the blackout situation designed using a branch tripping method. Furthermore, the transient stability responses are subjected to the power generation of the electric power system in Malang Raya as a real system operation for interacting the generating and demand sites. Results obtained show that voltage changes of Wlingi power station is 0.944 pu to 0.946 pu and its overshoot is 0,962. But the other overshoot of the power generation in Sutami remained to 0.968 pu at 0.5 second after appearing a blackout fault and its voltage increase to 0.952 pu from 0.948 pu at the final stable position.
Transient stability analysis on a multi machine system in psateSAT Journals
Abstract
Modern power system are subject to large disturbances such as three phase short circuit faults. When a fault occurs on a system
the generators rotor angle becomes unstable and thus it losses synchronism with the system and it becomes unstable. Thus
transient stability analysis can be performed on a system in order to understand the generators performance when subjected to a
short circuit fault. When the system is subjected to a fault the generator experiences transient oscillations in rotor speed and
angle which can be effectively suppressed with the incorporation of Automatic Voltage Regulator (AVR) and Power System
Stabilizer (PSS). The simulations have been performed using the MATLAB/PSAT software.
Keywords—Transient stability, Three phase fault Faults, AVR, PSS.
Voltage recovery of induction generator using indirect torque control methodiaemedu
1) The document discusses using a STATCOM to indirectly control the torque of an induction generator connected to the grid through voltage modulation in order to improve voltage recovery following a fault.
2) It proposes an indirect torque control method where the STATCOM controls the generator's terminal voltage during recovery to limit torque and smooth transients.
3) Time-domain simulations show that indirect torque control with STATCOM successfully limits the peak torque and speeds recovery of the generator's voltage, speed, and torque following a three-phase fault.
Voltage profile Improvement Using Static Synchronous Compensator STATCOMINFOGAIN PUBLICATION
Static synchronous compensator (STATCOM) is a regulating device used in AC transmission systems as a source or a sink of reactive power. The most widely utilization of the STATCOM is in enhancing the voltage stability of the transmission line. A voltage regulator is a FACTs device used to adjust the voltage disturbance by injecting a controllable voltage into the system. This paper implement Nruro-Fuzzy controller to control the STATCOM to improve the voltage profile of the power network. The controller has been simulated for some kinds of disturbances and the results show improvements in voltage profile of the system. The performance of STATCOM with its controller was very close within 98% of the nominal value of the busbar voltage.
This document provides an overview of power system stability analysis. It defines power system stability as the ability of a system to maintain equilibrium during normal operation and regain equilibrium after disturbances. It discusses different types of stability including rotor angle stability and voltage stability. Key factors that influence stability like operating conditions, faults, and clearing times are also summarized. Methods for enhancing stability such as high-speed fault clearing and controlled load shedding are briefly mentioned. Models for analyzing stability like the swing equation and equal area criterion are defined in less than 3 sentences.
FLC based on static var compensator for power system transient stability enha...TELKOMNIKA JOURNAL
1. The document discusses using a fuzzy logic controller combined with a PI controller to control a static var compensator (SVC) for improving power system transient stability.
2. A two generator, three bus test system is used to compare the performance of the fuzzy-SVC controller versus a conventional PI-SVC controller under different fault conditions.
3. Simulation results show that for a single line to ground fault, both controllers perform similarly. However, for a more severe three line to ground fault, the fuzzy-SVC controller is able to damp oscillations faster and achieve stability more quickly than the PI-SVC controller due to its ability to handle nonlinear system dynamics.
Tuning of PI and PID Controller with STATCOM, SSSC and UPFC for Minimizing Da...IOSRJEEE
This paper presents the comparative performance of directly and feedback connected PI and PID controller scheme with Flexible AC Transmission System (FACTS) devices, such as Static Synchronous Compensator (STATCOM), Static Synchronous Series Compensator (SSSC) and Unified Power Flow Controller (UPFC) in terms of improvements in transient stability, extenuation of system oscillations and furnishing voltage support in single machine infinite bus system (SMIB). Firstly, rotor angle deviation and speed deviation analyzed for directly connected PI and PID with UPFC, SSSC and STATCOM then for feedback connected. The comparisons of all the results are performed using Matlab simulink in term of maximum overshoot and settling time.
The aim of this paper is to prove that fuzzy logic algorithm is a suitable control technique for fast processes such as electrical machines. This theory has been experimented on different kinds of electrical machines such as stepping motors, dc motors and induction machines (with 6 phases) and the experimental results show that the proposed fuzzy logic algorithm is the most suitable control technique for electrical machines since this algorithm is not time consuming and it is also robust between plant parameters variations.
Review of Improved Direct Torque Control Methodologies for Induction Motor Dr...AM Publications
ecoupled control of induction motor drives is possible using Direct Torque Control (DTC) method which
is very simple control strategy compared to field oriented control. In this method direct torque control is achieved by
selecting suitable inverter switching voltage vector from a lookup table. But drawback of this method is that it
produces toque ripples. Also the switching frequency of inverter switches is not constant. Many methods have been
proposed to address these issues of DTC. This paper reviews various methodologies which are suggested to improve
performance of basic DTC induction motor drive.
Basically, the direct torque control (DTC) drive system is operated at light load. At light load, supplying the drive system with rated flux will decrease the efficiency of the system. To maximize the efficiency of drive system, an optimal flux has been applied during steady-state but when a torque is suddenly needed, for example during acceleration, the dynamic of the torque response would be degraded. Therefore, a modification to the voltage vector as well as look-up table has been proposed for the torque response improvement. The proposed voltage vector is generated by adding two adjacent conventional voltage vectors and implemented by using duty ratio. The duty ratio is used to estimate the activation time of each conventional voltage vector in order to produce the proposed voltage vector.
This document summarizes a research paper that models, simulates, and analyzes the performance of a variable frequency drive (VFD) for speed control of an induction motor. The summary is:
1) A VFD controls the speed of an induction motor by varying the frequency of the applied AC voltage using pulse width modulation. This allows variable motor speed control needed in some industrial applications.
2) The paper models the key components of a VFD - the rectifier, DC bus, and inverter - and models the induction motor in a dq reference frame.
3) Simulation results in Matlab/Simulink successfully demonstrate speed control of the induction motor from zero to nominal speed by varying the drive
This document describes a control strategy for a PWM voltage source converter (PWM-VSC) using fuzzy logic to provide variable DC voltage for controlling the speed of a DC motor. A fuzzy logic controller is proposed to minimize errors in the DC voltage and stabilize it by regulating the amplitude of the network current. Simulation results show the fuzzy logic controller produces a stable DC voltage without overshoot to drive the DC motor, with less than 5% total harmonic distortion in the network current and a power factor near unity. The DC motor speed is also stable without overshoot in response to variations in the controlled DC voltage.
The document describes the design, simulation, implementation and control of a PLC-based integral cycle controller for resistance spot welding applications. Some key points:
1) An integral cycle controller provides power to a load by passing full voltage cycles on for a set number of cycles, then off for the remaining cycles, varying the duty cycle to control output power.
2) A simulation of an integral cycle controller was developed in MATLAB to analyze output waveforms and harmonic profiles for different duty cycles.
3) The integral cycle controller was designed using a PLC to provide flexible control and implemented for resistance spot welding, which benefits from integral cycle control's ability to minimize harmonics compared to phase control.
Performance evaluation of different structures of power system stabilizers IJECEIAES
The electric power from the system should be reliable and economical for consumer’s equipment satisfaction. An electric power system consists of many generators, transformers, transmission lines, loads, etc. For the power system network, dynamic performance and stability are important. The system is lost its stability by some disturbances i.e., load variations, generator failure, prime mover failure, transmission line outage, etc. Whenever load variations in the system, generator rotor speed will vary, means oscillations in the rotor speed, which is deviating from rated speed. The excitation system will control the generator rated line voltage. When fault occurs at any equipment in the system, the system will unstable. If fault occurs at generator, the generator oscillates. To reduce the oscillations and to make the system stable used power system stabilizers (PSS’s). Here, three types of PSS’s are used i.e., PSS1B, PSS2B, PSS4B. Comparisons of three PSS’s are on the multi machine system under some disturbance. From the observations, concluding that PSS4B is quickly control the oscillations in the physical parameters of machine in the system than other power system stabilizers.
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.
Direct Torque Control of Induction Motor Drive Fed from a Photovoltaic Multil...IJERA Editor
This paper presents Direct Torque Control (DTC) using Space Vector Modulation (SVM) for an induction motor drive fed from a photovoltaic multilevel inverter (PV-MLI). The system consists of two main parts PV DC power supply (PVDC) and MLI. The PVDC is used to generate DC isolated sources with certain ratios suitable for the adopted MLI. Beside the hardware system, the control system which uses the torque and speed estimation to control the load angle and to obtain the appropriate flux vector trajectory from which the voltage vector is directly derived based on direct torque control methods. The voltage vector is then generated by a hybrid multilevel inverter by employing space vector modulation (SVM). The inverter high quality output voltage which leads to a high quality IM performances. Besides, the MLI switching losses is very low due to most of the power cell switches are operating at nearly fundamental frequency. Some selected simulation results are presented for system validation.
POWER QUALITY IMPROVEMENT BY SSSC AND STATCOM USING PI CONTROLLERJournal For Research
This document summarizes research on using SSSC (Static Synchronous Series Compensator) and STATCOM (Static Synchronous Compensator) to improve power quality and voltage stability in a two machine, four bus power system model. It describes the basic operational principles of SSSC and STATCOM, which are FACTS devices that can be connected in series and parallel, respectively, with transmission lines. The document presents simulation results showing that connecting an SSSC to Bus 2 and a STATCOM to Bus 2 both increase the voltage levels and regulate active and reactive power flows at the different buses, demonstrating the effectiveness of these devices for maintaining voltage stability.
Influencing Power Flow and Transient Stability by Static Synchronous Series C...ijeei-iaes
This document summarizes research on using a Static Synchronous Series Compensator (SSSC) to improve power flow and transient stability in a Single Machine Infinite Bus (SMIB) system. The research models an SMIB system and analyzes its power angle curve and transient stability both with and without an SSSC. Results show that the SSSC is effective at stabilizing the system after a transient fault by controlling voltage injection and virtual line impedance. The SSSC allows the system to regain stability faster than without the SSSC. Therefore, the SSSC is concluded to be an effective means of influencing power flow and improving transient stability in power systems.
IRJET- Vector Control of Three Phase Induction MotorIRJET Journal
This document discusses vector control of a three-phase induction motor. Vector control, also called field-oriented control, allows independent control of torque and flux in induction motors, similar to DC motors. The document describes:
1) How vector control works by transforming stator currents into orthogonal d-q components representing flux and torque.
2) The principle of field-oriented control which locks the d-q reference frame to the rotor flux vector for decoupled control of flux and torque.
3) The simulation model built in MATLAB/Simulink to test vector control, including blocks for Clarke/Park transformations, current control, and a PI speed controller.
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Load flow analysis with upfc under unsymmetrical fault conditionAlexander Decker
This document discusses load flow analysis with and without a Unified Power Flow Controller (UPFC) under different fault conditions in a six bus power system simulation model. The UPFC is a Flexible AC Transmission System (FACTS) device that can control parameters like voltage, impedance, and phase angle to control power flow. The study aims to improve transient stability of the six bus system by determining active and reactive power on load buses under different fault types both with and without the UPFC. The control scheme and operating principle of the UPFC are also explained.
Simulation of D-STATCOM to study Voltage Stability in Distribution systemijsrd.com
This document presents a simulation study of a D-STATCOM (Distribution Static Compensator) to improve voltage stability in a distribution system. It first provides background on voltage dips and describes the structure of a STATCOM, which includes a voltage source inverter, transformer, and controller. The simulation model of the D-STATCOM and distribution network is developed using SimPowerSystems blocks. Simulation results show that without the D-STATCOM, voltage dips to 0.93 p.u. during a load change, but with the D-STATCOM the voltage is stabilized at 1.0 p.u., demonstrating its effectiveness in mitigating power quality issues like voltage instability.
This document presents a new control scheme for a STATCOM (Static Synchronous Compensator) to improve power quality in a grid-connected wind energy system. A STATCOM equipped with a battery energy storage system is connected at the point of common coupling between the wind farm and the grid. The STATCOM control scheme uses a hysteresis current control technique to inject compensating current and regulate the grid voltage. Simulation results show the STATCOM can mitigate reactive power demand and harmonics, as well as respond quickly to changes in load to help regulate voltage and current waveforms at the point of connection to the grid.
IRJET - Power Quality Improvement in Distribution Power System using STATCOMIRJET Journal
This document discusses using a STATCOM (Static Synchronous Compensator) to improve power quality in a distribution power system. It first describes the system being modeled in MATLAB/SIMULINK, including the grid, transmission line, and R-L load parameters. Simulation results showing voltage, current, power factor, and real/reactive power are provided for the uncompensated system. A STATCOM is then added to the model. Simulation results with the STATCOM show improved power quality as indicated by the voltage and current waves becoming in phase, power factor increasing to near unity, and greater real power able to be delivered to the load. The STATCOM effectively provides reactive power compensation to improve system performance.
Active Reactive Power Flow Control Using Static Synchronous Series Compensato...IOSR Journals
1) The document discusses using a Static Synchronous Series Compensator (SSSC) and STATCOM to control active and reactive power flow in transmission lines.
2) An SSSC injects a controllable voltage in quadrature with the line current, allowing both capacitive and inductive compensation. A STATCOM regulates voltage by controlling reactive power injection or absorption.
3) Simulation studies were conducted on a two-area, 11-bus system model in MATLAB/Simulink to observe the compensation achieved by installing an SSSC or STATCOM. The system parameters, such as voltage, current, active and reactive power transmissions were monitored with the FACTS devices connected.
1) The document discusses different control strategies for DSTATCOM (distribution static synchronous compensator), including Synchronous Reference Frame (SRF) methods, to mitigate voltage sags and compensate reactive power.
2) It analyzes the SRF method, SRF without phase locked loop (PLL), and a modified SRF method through mathematical modeling and MATLAB simulation.
3) The comparison of results from the different control strategies indicates that SRF provides effective compensation of voltage sags and reactive power under steady state conditions.
Control of Active And reactive power flow in transmission line and power Osci...AM Publications
the continuous demand in electric power system network has caused the system to be heavily loaded
leading to voltage instability. This paper describe the active approach to series line compensation, in which static
voltage sourced converter, is used to provide controllable series compensation. This compensator is called as Static
synchronous series compensator (SSSC). It injects the compensating voltage in phase quadrature with line current, it
can emulate as inductive or capacitive reactance so as to influence the power flow in the line. With DC power supply it
can also compensate the voltage drop across the resistive component of the line impedance. In addition, the series
reactive compensation can greatly increase the power oscillation damping.
Simulations have been done in MATLAB SIMULINK. Simulation results obtained for selected bus-2 in two machine
power system. From the result we can investigate the effect of this device in controlling active and reactive power as
well as damping power system oscillations in transient mode.
Efficacy of Facts in Power Oscillation Damping and Renewable IntegrationIOSRJEEE
This document summarizes research on using flexible AC transmission system (FACTS) devices to improve power oscillation damping and facilitate renewable energy integration. It discusses how power oscillations can lead to instability if not controlled and how FACTS devices like STATCOM and SVC can enhance stability. It presents simulations of the IEEE 14-bus system that demonstrate improved damping from these controllers. Eigenvalue analysis shows STATCOM shifts modes further into the stable region than SVC. Both STATCOM and SVC integration helps renewable sources by mitigating power quality issues to allow more distributed generation on the grid.
NEW STATCOM CONTROL SCHEME FOR POWER QUALITY IMPROVEMENT IN WIND FARM.sannuthi yaramapu
Now a days we are facing so many problems with power quality issues. So in order to mitigate these problems and to improve the power quality we are using new STATCOM control scheme in wind farm.
Performance and Analysis of Reactive Power Compensation by Unified Power Flow...ijeei-iaes
The Unified Power Flow Controller (UPFC) is the most versatile of the FACTS controllers envisaged so far. The main function of the UPFC is to control the flow of real and reactive power by injection of a voltage in series with the transmission line. Both the magnitude and the phase angle of the voltage can be varied independently. Real and Reactive power flow control can allow for power flow in prescribed routes, loading of transmission lines close to their thermal limits and can be utilized for improving transient and small signal stability of the power system. In this paper UPFC is incorporated in a SMIB (Single Machine Infinite Bus) system and the response of SMIB system has been recorded with and without UPFC, thereafter the comparison of both the output has been done. When no UPFC is installed, real and reactive power through the transmission line cannot be controlled. This paper presents control and performance of UPFC intended for installation on that transmission line to control power flow. Installing the UPFC makes it possible to control amount of active power flowing through the line. Simulations are carried out using MATLAB software to validate the performance of the UPFC.
This document summarizes a research paper that analyzes the performance of a STATCOM (Static Synchronous Compensator) under various power system faults. It proposes an "emergency PWM" control strategy to prevent overcurrents in the voltage source converter (VSC) during faults, allowing the STATCOM to continue supplying reactive power support when needed. Simulation results are presented for a 48-pulse VSC-based ±100 MVAR STATCOM connected to a 2-bus power system, validating that the emergency PWM strategy prevents overcurrents and allows reactive power support during line-to-ground faults.
Real and Reactive Power Compensation by using Diode Clamped Multilevel Invert...IRJET Journal
This document discusses using a diode-clamped multilevel inverter based STATCOM to provide both real and reactive power compensation on a transmission line. A STATCOM is a shunt connected device that can regulate voltage and provide reactive power support. A diode-clamped multilevel inverter is proposed for the STATCOM due to its ability to generate stepped voltage waveforms with lower harmonic distortion compared to a two-level inverter. Simulation results using MATLAB/Simulink show that the multilevel inverter based STATCOM can effectively regulate the voltage and maintain stability of the load while supplying real and reactive power to the transmission line.
POWER STABILITY ANALYSIS OF A TRANSMISSION SYSTEM WITH A UNIFIED POWER FLOW C...IJITE
The unified power quality conditioner is the equipment used for regulated voltage distortion and voltage
unbalance in a power system. UPFC can enhance the power to flow through the transmission system by
controlling the power flow and voltage stability of the transmission line within their limits. This paper
presents a control scheme and Theoretical derivation of the unified power flow conditioner and the
simulation results are compared and contrasted in detail. UPFC is a combination of shunt Active and
series active power filters. UPFC contains a DC link capacitor in a single-phase voltage source inverter
with two back to back connected, three-phase three-wire and three-phase four-wire are arranged. The
fundamental target of this work is to determine the causes and impacts of power quality problems,
specifically voltage sag, voltage swell, power factor, and Total Harmonics Distortion (THD) and enhance
the power quality of a transmission system by UPFC based Transformative Intrinsic Algorithm (TIA). The
Simulation of the proposed method is developed by Mat lab Simulink software, and the simulation result
shows, the proposed method gives better solutions to control the power imbalance in the distribution
system with its cost-effectiveness.
Comparison of Multi-Machine Transient Stability Limit Using UPFCIJMTST Journal
The stability of an interconnected power system is compare to normal or stable operation after having been
subjected to some form of disturbance. With interconnected systems continually growing in size and extending
over vast geographical regions, it is becoming increasingly more difficult to maintain synchronism between
various parts of the power system. This paper investigates the comparison of transient stabil ity limit of a
multi-machine power system wi th the help of a UPFC operated in perpendicular vol tage control
mo d e an d t h e i r i t ’ s c omp ar i s o n .
Igbt based on vector control of induction motor driveeSAT Journals
Abstract
Generally, induction motor is fed by Current supply Inverter (CSI). During this project, hybrid model during which CSI area unit
accustomed feed the induction motor, are introduced. CSI employed in this work is SCR primarily based device. the standard gate
turn-off thyristor (GTO) primarily based CSI-fed induction motor drives suffer from draw- backs like low-frequency torsion pulsation,
harmonic heating and unstable operation at low-speed ranges. so as to beat these drawbacks, STATCOM is an efficient answer for
facing such power quality issues. This report deals with one in all the potential applications of Static Synchronous Compensator
(STATCOM) to industrial systems for mitigation of voltage dip drawback. The dip in voltage is mostly encountered throughout the
beginning of Associate in nursing induction motor. The model of STATCOM connected in shunt configuration to a 3 part supply
feeding dynamic motor masses is developed exploitation Simulink of MATLAB software package. Simulated results demonstrate that
STATCOM may be thought-about as a viable answer for finding such voltage dip issues. This thesis work aims at developing a
STATCOM for induction machines with reduced voltage dip.
Keywords: STATCOM, CSI,
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
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user friendly.
Open Channel Flow: fluid flow with a free surfaceIndrajeet sahu
Open Channel Flow: This topic focuses on fluid flow with a free surface, such as in rivers, canals, and drainage ditches. Key concepts include the classification of flow types (steady vs. unsteady, uniform vs. non-uniform), hydraulic radius, flow resistance, Manning's equation, critical flow conditions, and energy and momentum principles. It also covers flow measurement techniques, gradually varied flow analysis, and the design of open channels. Understanding these principles is vital for effective water resource management and engineering applications.