This paper presents the design of a non-linear controller to prevent an electric power system losing synchronism after a large sudden fault and to achieve good post fault voltage level. By Direct Feedback Linearizatio...This paper presents the design of a non-linear controller to prevent an electric power system losing synchronism after a large sudden fault and to achieve good post fault voltage level. By Direct Feedback Linearization (DFL) technique robust non-linear excitation controller is designed which will achieve stability enhancement and voltage regulation of power system. By utilizing this technique, there is a possibility of selecting various control loops for a particular application problem. This method plays an important role in control system and power system engineering problem where all relevant variables cannot be directly measured. Simulated results carried out on a single machine infinite bus power system model which shows the enhancement of transient stability regardless of the fault and changes in network parameters.展开更多
In this paper, the Authors present the designing of power system stabilizer (PSS) and static var compensator (SVC) based on chaos, particle swarm optimization (PSO) and shuffled frog leaping (SFL) Algorithms has been ...In this paper, the Authors present the designing of power system stabilizer (PSS) and static var compensator (SVC) based on chaos, particle swarm optimization (PSO) and shuffled frog leaping (SFL) Algorithms has been presented to improve the power system stability. Single machine infinite bus (SMIB) system with SVC located at the terminal of generator has been considered to evaluate the proposed SVC and PSS controllers. The coefficients of PSS and SVC controller have been optimized by Chaos, PSO and SFL algorithms. Fi-nally the system with proposed controllers is simulated for the special disturbance in input power of genera-tor, and then the dynamic responses of generator have been presented. The simulation results show that the system composed with recommended controller has outstanding operation in fast damping of oscillations of power system and describes an application of Chaos, PSO and SFL algorithms to the problem of designing a Lead-Lag controller used in PSS and SVC in power system.展开更多
The parameters of power system slowly change with time due to environmental effects or may change rapidly due to faults. It is preferable that the control technique in this system possesses robustness for various faul...The parameters of power system slowly change with time due to environmental effects or may change rapidly due to faults. It is preferable that the control technique in this system possesses robustness for various fault conditions and disturbances. The used flexible alternating current transmission system （FACTS） in this paper is an advanced super-conducting magnetic energy storage （ASMES）. Many control techniques that use ASMES to improve power system stability have been proposed. While fuzzy controller has proven its value in some applications, the researches applying fuzzy controller with ASMES have been actively reported. However, it is sometimes very difficult to specify the rule base for some plants, when the parameters change. To solve this problem, a fuzzy model reference learning controller （FMRLC） is proposed in this paper, which investigates multi-input multi-output FMRLC for time-variant nonlinear system. This control method provides the motivation for adaptive fuzzy control, where the focus is on the automatic online synthesis and tuning of fuzzy controller parameters （i.e., using online data to continually learn the fuzzy controller that will ensure that the performance objectives are met）. Simulation results show that the proposed robust controller is able to work with nonlinear and nonstationary power system （i.e., single machine-infinite bus （SMIB） system）, under various fault conditions and disturbances.展开更多
为了研究频率、幅值下垂特性对直驱型永磁风电系统小扰动稳定性的影响,建立了包含永磁同步电机(permanent magnet synchronous generator,PMSG)的单机无穷大系统小扰动稳定性分析的数学模型;采用最大功率点跟踪控制(maximum power point...为了研究频率、幅值下垂特性对直驱型永磁风电系统小扰动稳定性的影响,建立了包含永磁同步电机(permanent magnet synchronous generator,PMSG)的单机无穷大系统小扰动稳定性分析的数学模型;采用最大功率点跟踪控制(maximum power point tracking,MPPT),保证风力发电机输出功率最大;研究了网侧变换器基于下垂特性的控制方案,理论分析表明,下垂特性对系统的小扰动稳定性有较大影响;利用Matlab建模,对系统在不同下垂特性系数条件下进行了时域分析。仿真结果验证了理论分析的正确性,为采用下垂特性控制的直驱型永磁风力发电系统安全稳定的并网运行提供了一些可借鉴的理论依据。展开更多
在总结常用的电力系统稳定器(P S S)参数优化方法的基础上,采用了典型超前-滞后环节的P S S,对基本遗传算法进行了一些改进,并将改进的遗传算法应用到包含P S S的单机无穷大系统进行验证。测试结果表明,遗传算法优化参数的P S S对大、...在总结常用的电力系统稳定器(P S S)参数优化方法的基础上,采用了典型超前-滞后环节的P S S,对基本遗传算法进行了一些改进,并将改进的遗传算法应用到包含P S S的单机无穷大系统进行验证。测试结果表明,遗传算法优化参数的P S S对大、小扰动都表现出了良好的性能。展开更多
文摘This paper presents the design of a non-linear controller to prevent an electric power system losing synchronism after a large sudden fault and to achieve good post fault voltage level. By Direct Feedback Linearization (DFL) technique robust non-linear excitation controller is designed which will achieve stability enhancement and voltage regulation of power system. By utilizing this technique, there is a possibility of selecting various control loops for a particular application problem. This method plays an important role in control system and power system engineering problem where all relevant variables cannot be directly measured. Simulated results carried out on a single machine infinite bus power system model which shows the enhancement of transient stability regardless of the fault and changes in network parameters.
文摘In this paper, the Authors present the designing of power system stabilizer (PSS) and static var compensator (SVC) based on chaos, particle swarm optimization (PSO) and shuffled frog leaping (SFL) Algorithms has been presented to improve the power system stability. Single machine infinite bus (SMIB) system with SVC located at the terminal of generator has been considered to evaluate the proposed SVC and PSS controllers. The coefficients of PSS and SVC controller have been optimized by Chaos, PSO and SFL algorithms. Fi-nally the system with proposed controllers is simulated for the special disturbance in input power of genera-tor, and then the dynamic responses of generator have been presented. The simulation results show that the system composed with recommended controller has outstanding operation in fast damping of oscillations of power system and describes an application of Chaos, PSO and SFL algorithms to the problem of designing a Lead-Lag controller used in PSS and SVC in power system.
文摘The parameters of power system slowly change with time due to environmental effects or may change rapidly due to faults. It is preferable that the control technique in this system possesses robustness for various fault conditions and disturbances. The used flexible alternating current transmission system （FACTS） in this paper is an advanced super-conducting magnetic energy storage （ASMES）. Many control techniques that use ASMES to improve power system stability have been proposed. While fuzzy controller has proven its value in some applications, the researches applying fuzzy controller with ASMES have been actively reported. However, it is sometimes very difficult to specify the rule base for some plants, when the parameters change. To solve this problem, a fuzzy model reference learning controller （FMRLC） is proposed in this paper, which investigates multi-input multi-output FMRLC for time-variant nonlinear system. This control method provides the motivation for adaptive fuzzy control, where the focus is on the automatic online synthesis and tuning of fuzzy controller parameters （i.e., using online data to continually learn the fuzzy controller that will ensure that the performance objectives are met）. Simulation results show that the proposed robust controller is able to work with nonlinear and nonstationary power system （i.e., single machine-infinite bus （SMIB） system）, under various fault conditions and disturbances.
文摘为了研究频率、幅值下垂特性对直驱型永磁风电系统小扰动稳定性的影响,建立了包含永磁同步电机(permanent magnet synchronous generator,PMSG)的单机无穷大系统小扰动稳定性分析的数学模型;采用最大功率点跟踪控制(maximum power point tracking,MPPT),保证风力发电机输出功率最大;研究了网侧变换器基于下垂特性的控制方案,理论分析表明,下垂特性对系统的小扰动稳定性有较大影响;利用Matlab建模,对系统在不同下垂特性系数条件下进行了时域分析。仿真结果验证了理论分析的正确性,为采用下垂特性控制的直驱型永磁风力发电系统安全稳定的并网运行提供了一些可借鉴的理论依据。
