ESA对DFIG风电场并网系统静态电压稳定性影响

Static voltage stability of power systems including wind farm equipped with DFIG based on ESA

针对双馈式风电场接入电网影响原有电力系统静态电压稳定的问题.采用潮流方程雅可比矩阵的特征结构分析法(ESA),结合相关节点的参与程度和系统的静态电压稳定裕度,给出了正常负荷下的弱稳定区和极限负荷下的失稳区.风电场并网的简化模型在标准IEEE39节点测试系统进行仿真分析.研究结果表明:接入风电场后系统的静态稳定裕度降低,弱稳定区域扩大;风电场的接入使得系统的负荷裕度降低,但不影响失稳区和失稳模式;随着风电场有功出力的减小,风电场所在节点的参与因子逐渐增大,系统的静态稳定裕度逐渐减小,风电场所在节点逐渐成为影响系统电压稳定的关键节点.

For the impact of integration of DFIG based wind farm on the static voltage stability of power systems,eigenvalue structure analysis(ESA) of Jacobian matrix is employed,and weak stability region under normal load and the instability region under limit load are provided by combining with the participation information of relative nodes and static stability margin of system.The simplified model of wind farm was applied for simulation and analysis in the standard IEEE test system with 10 machines and 39 nodes.The result of study shows that the integration of wind farm reduces the static stability margin and extends the weak stability region;the integration of wind farm decreases the system’s load margin,but it has no effects on the instability region and instability mode.Furthermore,with the output active power of wind farm decreasing,the participation factors of wind farm node increases,the static stability margin decreases,and wind farm node becomes a key node which impacts the system’s static voltage stability.