特征结构分析法对风电系统静态电压稳定的研究

Study on steady state voltage stability of power systems including wind farms based on eigen-structure analysis

以特征结构分析法为理论基础,对包含风电场(基于恒速恒频机组构成)的电力系统的静态电压稳定问题进行研究。通过对相关比、参与因子和潮流雅可比矩阵、收缩有功和无功雅可比矩阵最小模特征值的分析,揭示电压和角度不稳定的机理和失稳模态,并提供相关节点的参与程度和系统的稳定裕度信息。仿真结果表明:基于恒速恒频机组构成的风电场及其附近节点具有较强的无功-电压参与程度,是系统电压失稳的关键区域。在IEEE10机39节点电力系统中加入基于恒速恒频机组的风电场并网的简化模型进行仿真研究,采用连续潮流算法对系统平衡解流形进行追踪,对鞍结分岔点的计算采用分岔理论中的直接算法,工具软件采用MATLAB7.04。

Based on eigen-structure analysis theory, the static voltage stability of power systems including wind farms was studied. By analyzing correlation ratio, participation factor, Jacobian matrix of system power flow, reduced reactive and active power Jacobian matrix and their smallest module eigenvalues, this paper presented the mechanism of voltage and angle instability, instability mode, participation information of relative nodes and information of system stability margin. The simulation results show that the wind farm and its associated nodes perform actively in the participation of reactive power and voltage stability characteristic, and they are the congested area in the power system. An IEEE system with 10 machines and 39 nodes including simplified models of wind farms was applied for simulation analysis; the equilibrium solution manifolds of the system were calculated using CPF method; direction method was used to identify saddle-node bifurcation point and the software MATLAB7.04 was adopted.