UPFC在静态电压稳定分析中的应用

Application of UPFC to the Static Voltage Stability Analysis

为了更好地提高电压稳定性,在系统中安装了统一潮流控制器(UPFC),建立了静态电压稳定分析的优化数学模型,并采用等效注入功率法将UPFC嵌入电力系统。针对优化计算过程中基本粒子群算法易陷入局部最优解的缺点,采用了自适应聚焦粒子群算法,并结合连续潮流法对目标函数进行寻优计算,找到关于UPFC控制参数、发电机端电压、有载调压变压器档位以及无功补偿电容器容量的最优的控制变量组合,并求出最大静态电压稳定裕度。通过对IEEE6,IEEE30标准节点系统进行计算,验证了应用UPFC对提高静态电压稳定裕度的有效性。

In order to improve voltage stability,UPFC（uniformed power flow controller）was installed in the system.This paper establishes the optimized mathematical model for the analysis of static voltage stability,and adopts UPFC voltage source model embedding into the power system.To solve the local optimum in the optimization process by particle swarm optimization（PSO）,the adaptive focusing particle swarm optimization（AFPSO）is proposed.A method which combines continuation power flow and adaptive focusing particle swarm optimization algorithm is applied to seek the optimal combination of control variables that including UPFC,generator terminal voltage,transformer taps and the capacity of reactive power compensation,and at the mean time solving the maximum static voltage stability margin.Finally,cases study with the standard node system of IEEE6 and IEEE30,demonstrated the validity of the proposed method to improve voltage stability margin of the power system.