利用PSS抑制系统低频振荡的分析

本文主要讨论二次系统对策中采用电力系统稳定器(PSS)作为励磁系统附加控制器,电力系统稳定器(PSS)能够补偿由于励磁系统和电机励磁绕组引起的滞后,可有效提高系统的阻尼水平,起到抑制低频振荡的作用.通过适当整定PSS参数来提高抑制低频振荡的附加阻尼力矩.通过对单机无穷大系统的分析,讨论了该系统中低频振荡的原因,仿真分析了电力系统稳定器PSS各控制环节中的参数对抑制低频振荡的作用.     

电力系统稳定器设计的广义相位补偿法

针对经典相位补偿法理论背景不完善、无法应用于多机系统的问题,从代数学的角度提出简单的特征值实部表达式,应用该式从新的角度分析单机无穷大系统中出现负阻尼现象的原因,解释了电力系统稳定器抑制振荡的机理.将该式推广至多机系统,导出适用于多机系统的稳定判据,该判据可以用于稳定器相位补偿参数设计和PSS选址.稳定器增益整定问题被转化为一个只包含少数变量和约束条件的多项式优化问题,介绍2种不同的方法进行求解.通过4个典型系统的算例分析,验证了该方法的可行性和正确性.     

同步发电机PSS与励磁系统的仿真研究

电力系统稳定器(PSS)是目前抑制电力系统低频振荡最有效的方法之一.在分析了同步发电机励磁控制系统及其模型的基础上,研究了以PSS为辅助控制的同步发电机励磁控制方式,基于Matlab构建了改进的PSS励磁控制系统的仿真模型.在三相短路以及断线故障情况下对单机无穷大系统进行仿真测试,结果表明:加装PSS的励磁控制系统的各方面性能优越于无PSS的励磁控制系统,为励磁系统的设计提供了依据.     

H_∞PSS设计中加权函数的选择及模型降阶

基于H∞鲁棒控制理论的基本原理,设计了电力系统稳定器,克服了传统电力系统稳定器(PSS)鲁棒性差的缺点。针对H∞PSS设计中,权函数的选择较困难,以及H∞PSS阶数往往很高的缺陷,提出了选择权函数时较为通用的方法,以及基于Gram矩阵的均衡降阶方法,并说明了当直接从MATLAB工具箱得到的H∞PSS不是最小实现模型时,如何降阶。为了与传统PSS进行比较,针对单机无穷大系统受到扰动后发生低频振荡的例子,给出了几组仿真试验结果。结果表明H∞PSS能够在较大的运行范围内抑制振荡,显示了良好的鲁棒性。     

基于最小熵H_∞控制的降阶电力系统稳定器设计

针对电力系统的低频振荡问题,提出了一种基于最小熵H∞控制理论的电力系统稳定器的设计方法。为了获得低阶电力系统稳定器,采用降阶方法分别对原系统和控制器进行了降阶处理。利用BFO-PSO混合算法对权函数进行选取,把多个不同的设计目标转换为不等式约束,将加权函数的选取表示为一个多目标优化问题。针对4机2区域电力系统,根据参与因子确定PSS的安装地点,设计了抑制区域振荡的最小熵H∞电力系统稳定器。仿真结果表明,最小熵H∞电力系统稳定器能有效地抑制区域间的低频振荡,并且对整个系统的阻尼也有所改善。     

PSS参数选择和优化的仿真分析

电力系统稳定器(PSS)的参数设置对其控制效果至关重要,以系统功率振荡和功角振荡幅值最小为目标,应用电力系统仿真软件NETOMAC,对PSS参数进行优化,保证所选定的PSS参数具有良好地抑制低频振荡的效果．仿真结果表明应用参数优化方法,可迅速得到具有良好控制效果的PSS参数,并使其能满足多种运行方式的要求,是一种高效实用的参数调试方法．     

电力系统稳定器的配置与参数的频域设计法

通过对电力系统小干扰稳定性、特征值、相关因子的分析,介绍了多机电力系统中电力系统稳定器(PSS)的配置方法、PSS参数在频域中的整定.应用电力系统分析综合程序对一个3机电力系统进行了仿真分析与设计,结果证明了正确配置PSS能够增加系统阻尼、改善相应的弱振荡模式.     

PSS参数选择和优化的仿真分析

电力系统稳定器(PSS)的参数设置对其控制效果至关重要,以系统功率振荡和功角振荡幅值最小为目标,应用电力系统仿真软件NETOMAC,对PSS参数进行优化,保证所选定的PSS参数具有良好地抑制低频振荡的效果．仿真结果表明,应用参数优化方法,可迅速得到良好控制效果的PSS参数,并使其能满足多种运行方式的要求,是一种高效实用的参数调试方法．     

电力系统稳定器的配置与参数的频域设计法

通过对电力系统小干扰稳定性、特征值、相关因子的分析，介绍了多机电力系统中电力系统稳定器（PSS）的配置方法、PSS参数在频域中的整定．应用电力系统分析综合程序对一个3机电力系统进行了仿真分析与设计，结果证明了正确配置PSS能够增加系统阻尼、改善相应的弱振荡模式．     

基于最小熵H∞控制的降阶电力系统稳定器设计

针对电力系统的低频振荡问题,提出了一种基于最小熵H∞控制理论的电力系统稳定器的设计方法。为了获得低阶电力系统稳定器,采用降阶方法分别对原系统和控制器进行了降阶处理。利用BFOPSO混合算法对权函数进行选取,把多个不同的设计目标转换为不等式约束,将加权函数的选取表示为一个多目标优化问题。针对4机2区域电力系统,根据参与因子确定PSS的安装地点,设计了抑制区域振荡的最小熵H∞电力系统稳定器。仿真结果表明,最小熵H∞电力系统稳定器能有效地抑制区域间的低频振荡,并且对整个系统的阻尼也有所改善。     

Coordinated and uncoordinated design of LFO damping controllers with IPFC and PSS using ICA and SFLA

A single machine-infinite-bus(SMIB) system including the interline power flow controllers(IPFCs) and the power system stabilizer(PSS) controller is addressed. The linearized system model is considered for investigating the interactions among IPFC and PSS controllers. To improve the stability of whole system again different disturbances, a lead-lag controller is considered to produce supplementary signal. The proposed supplementary controller is implemented to improve the damping of the power system low frequency oscillations(LFOs). Imperialist optimization algorithm(ICA) and shuffled frog leaping algorithm(SFLA) are implemented to search for optimal supplementary controllers and PSS parameters. Moreover, singular value decomposition(SVD) method is utilized to select the most effective damping control signal of IPFC lead-lag controllers. To evaluate the system performance, different operating conditions are considered. Reponses of system in five modes including uncoordinated and coordinated modes of IPFC and PSS using ICA and SFLA are studied and compared. Considering the results, response of system without controller shows the highest overshoot and the longest settling time for rotor angel at the different operating conditions. In this mode of system, rotor speed has the highest overshoot. Rotor angel in the system with only PSS includes lower overshoot and oscillation than system without controller. When PSS is only implemented, rotor speed deviation has the longest settling time. Rotor speed deviation in the uncoordinated mode of IPFC and PSS shows lower overshoot than system with only PSS and without controller. It is noticeable that in this mode, rotor angel has higher overshoot than system with only PSS. The superiority of the suggested ICA-based coordinated controllers is obvious compared with SFLA-based coordinated controllers and other system modes. Responses of coordinated PSS and IPFC SFLA-based supplementary controllers include higher peak amplitude and longer settling time compared with coordinated IPFC and PSS ICA-based controllers. This comparison shows that overshoots, undershoots and the settling times are reduced considerably in coordinated mode of IPFC based controller and PSS using ICA. Analysis of the system performance shows that the proposed method has excellent response to different faults in power system.     

Power system stabilizer design using hybrid multi-objective particle swarm optimization with chaos

novel technique for the optimal tuning of power system stabilizer (PSS) was proposed, by integrating the modified particle swarm optimization (MPSO) with the chaos (MPSOC). Firstly, a modification in the particle swarm optimization (PSO) was made by introducing passive congregation (PC). It helps each swarm member in receiving a multitude of information from other members and thus decreases the possibility of a failed attempt at detection or a meaningless search. Secondly, the MPSO and chaos were hybridized (MPSOC) to improve the global searching capability and prevent the premature convergence due to local minima. The robustness of the proposed PSS tuning technique was verified on a multi-machine power system under different operating conditions. The performance of the proposed MPSOC was compared to the MPSO, PSO and GA through eigenvalue analysis, nonlinear time-domain simulation and statistical tests. Eigenvalue analysis shows acceptable damping of the low-frequency modes and time domain simulations also show that the oscillations of synchronous machines can be rapidly damped for power systems with the proposed PSSs. The results show that the presented algorithm has a faster convergence rate with higher degree of accuracy than the GA, PSO and MPSO.     

基于TMS320F28335的电力系统稳定器的研究

目前国内普遍采用以电功率作为输入信号的单输入电力系统稳定器(PSS),然而在原动机功率发生变化时,PSS本身不能区分系统波动和原动机功率波动,容易引起"反调"问题.为解决该问题,设计了一种基于TMS320F28335的以发电机的电功率和转子角速度作为输入信号的双输入PSS.首先,论述了双输入PSS的模型;硬件设计部分主...     

Gravitational search algorithm for coordinated design of PSS and TCSC as damping controller

A newly developed heuristic global optimization algorithm, called gravitational search algorithm (GSA), was introduced and applied for simultaneously coordinated designing of power system stabilizer (PSS) and thyristor controlled series capacitor (TCSC) as a damping controller in the multi-machine power system. The coordinated design problem of PSS and TCSC controllers over a wide range of loading conditions is formulated as a multi-objective optimization problem which is the aggregation of two objectives related to damping ratio and damping factor. By minimizing the objective function with oscillation, the characteristics between areas are contained and hence the interactions among the PSS and TCSC controller under transient conditions are modified. For evaluation of effectiveness and robustness of proposed controllers, the performance was tested on a weakly connected power system subjected to different disturbances, loading conditions and system parameter variations. The eigenvalues analysis and nonlinear simulation results demonstrate the high performance of proposed controllers which is able to provide efficient damping of low frequency oscillations.     

考虑时滞影响的统一潮流控制器的控制设计

为了克服广域测量系统（WAMS）中延时所带来的问题，提出了考虑时滞影响的统一潮流控制器（UPFC）的控制设计方法.建立了装有UPFC的单机无穷大(SMIB)电力系统的时滞线性微分方程组，并通过时域仿真简单分析了时滞对UPFC控制性能的负面影响.基于线性矩阵不等式(LMI)理论和Matlab中 LMI 工具箱，重新设计了UPFC，结合遗传算法优化得到了控制器参数.时域仿真结果表明，考虑时滞影响时设计的控制器能承受较长时间的控制信号延迟，有效改善了电力系统在不同时滞情况下的动态响应，增强了UPFC的时滞不敏感性和电力系统的静态稳定性     

多机电力系统中光伏发电厂附加稳定器的设计

在未来电力系统中,光伏发电厂将是一种重要的可再生电源.光伏发电厂接入未来电力系统将会影响输电系统稳定运行和控制.提出一种多机电力系统中光伏发电厂稳定器的设计新方法.首先搭建接入电网的光伏发电厂局部线性化模型.给出在光伏发电厂接入地点附近线路上发生低频功率振荡与附加稳定器控制的关系.在此局部线性化模型基础上,演示如何使用...