计及风机无功约束的电压稳定性分析

Analysis of Voltage Stability Considering Reactive Power Limitation of Wind Turbine

应用PV曲线法对基于双馈感应风力发电机组(doubly-fed induction generator,DFIG)风电场的静态电压稳定问题进行研究,提出基于分岔理论的方法来分析考虑双馈风机无功限制影响的风电场静态电压稳定裕度情况。通过含有双馈风电机组的风电场的IEEE30节点算例进行仿真研究,对比分析了不同无功极限对系统电压稳定裕度的影响,仿真结果表明考虑双馈风机功率极限对电压稳定裕度有一定的影响且影响分岔类型。DFIG的无功极限下系统的分岔类型不同,对风电接入系统的裕度影响不同。考虑DFIG发生的不同分岔可以更真实揭示系统的失稳原因和提供实际裕度。

This paper present a study on the static voltage stability of the electric power system connecting wind farms based on doubly-fed induction generators （DFIG） by applying the PV curve. The bifurcation theory is pro- posed to analyze the static voltage stability margin of wind farm considering the reactive power limitation of DFIG. The efficiency of algorithm is verified by IEEE 30 bus system model. The effect of voltage stability margin have been analyzed and compared by the different reactive power limitation of the system, and the results show that it has cer- tain influence on voltage stability margin and bifurcation type considering the DFIG power limitation. The margin ef- fect of wind power access to system is different because of the different system bifurcation types under the reactive power limitation of DFIG. It can be more true reveal the actual margin and reason of instability.