STATCOM在改善风火打捆系统暂态稳定性中的应用分析

Application and Research of STATCOM in Improving Transient Stability of Wind-thermal Bundled System

针对风火打捆运行模式使西北地区远距离输电的经济效益得到极大的改善,同时也导致电网系统稳定性降低的问题,结合双馈风机的外特性等效与静止同步补偿器(static synchronous compensator,STATCOM)分别从故障前、故障期间和切除故障后,对系统的功角稳定性进行了分析。基于等面积定则,指出等效参数及STATCOM对功角稳定性的影响并通过仿真验证,得出STATCOM不仅可以改善系统的电压稳定性,而且还可以在一定程度上改善系统的功角稳定性。

The operation mode of wind-thermal bundled system greatly improves the economic benefits oflong-distance transmission in Northwest China,but it also brings problems to the stability of power grid.Based on the equivalent external characteristics of double fed induction generator and static synchronous compensator(STATCOM),the power angle stability of the system is analyzed respectively from before fault,during fault and after fault removal.Based on the equal area rule,the influence of equivalent parameters and STATCOM on power angle stability is pointed out and verified by simulation.Finally,it is concluded that STATCOM can not only improve the voltage stability of the system,but also improve the power angle stability to a certain extent.