不同拓扑结构风电汇集系统的电压稳定性分析

Analysis on Voltage Stability of Wind Power Centralized System Considering Different Topological Structures

针对大规模风电场汇集并网后引起的电压稳定性问题,研究了适用于大容量风电汇集系统的电压稳定性分析方法和指标;并在该基础上考虑链形、混联形和辐射形典型拓扑结构对汇集系统电压稳定性的不同影响。利用Q-V曲线法从机理上分析出各汇集拓扑并网点的无功电压特性,并分别计算出其电压稳定裕度。最后对西北某实际风电汇集系统的仿真计算表明,辐射形汇集拓扑具有更好的静态电压稳定性和暂态电压响应特性,混联形次之,链形最差;可为实际工程中分析大规模风电并网的电压稳定性问题提供参考。

For voltage stability problem with the interconnection of large scale wind power centralized system,different voltage stability analysis methods and indexes suitable for large capacity of wind power collection system have been studied. On this basis,considering typical topoloies of wind power system such as chain,hybrid and radiate shape,different influence on voltage stability is researched. Q-V curve method is used to analyze reactive voltage characteristics of each topology＇ s key point and its voltage stability margin has been calculated. Finally,simulation results of a certain wind farm centralized system in North China show that radiate topology has the better static voltage stability and transient voltage response characteristics,hybrid form comes second and the chain is the worst. The conclusion provides a certain reference for voltage stability problem of large scale wind power integration in the practical engineering.