双馈风电系统低电压故障下无功控制方法研究  

Research on reactive power control of doubly-fed induction generator during the grid voltage sag

作　　者：张隆[1] 杨俊华[1] 陈思哲[1] 王秋晶[2] 吴捷[3] 

机构地区：[1]广东工业大学自动化学院,广州510006 [2]国网河南省电力公司信阳供电公司,河南信阳464000 [3]华南理工大学电力学院,广州510641

出　　处：《电测与仪表》2015年第14期66-70,109,共6页Electrical Measurement & Instrumentation

基　　金：国家自然科学基金资助项目(51307025;513770265;5177050);广东省高等学校科技创新项目(2013KJCX0059);广东省自然科学基金资助项目(S2012040007895);广东高校优秀青年创新人才培养计划项目资助(2012LYM_0052);广东省教育厅专项重点实验室(IDSYS200701)

摘　　要：在电网电压发生跌落故障期间,基于Crowbar电路的双馈风力发电系统需要吸收大量无功功率。通过分析故障下DFIG系统的运行特点,建立了变桨距角控制模型及网侧变流器的STATCOM控制模型,Crowbar电路动作后,利用变桨距系统调节桨距角来抑制系统转差率,减小系统从电网中吸收无功功率,同时将网侧变换器切换成STATCOM工作模式,为系统提供无功功率补偿,在PSCAD/EMTDC平台进行暂态仿真研究。结果表明,在故障期间Crowbar电路启动后,通过该控制策略能避免系统从电网中吸收过量无功功率,有助于主电网电压的重建和恢复,验证了所提方法的有效性和正确性。The vast grid reactive power would be absorbed by the crowbar-based doubly-fed induction generator （DFIG） wind turbine when the grid voltage dips fault occurred. The model of pitch control and STATCOM were built by analyzing the characteristics of DFIG system at grid fault. During the crowbar circuit active, the slip of DFIG could be restrained with the pitch controller to reduce the amount of reactive power consumption. The grid side converter was switched to STATCOM operation mode to compensate reactive power of DFIG system. With PSCAD/EMTDC simula- tion platform, the dynamic process of DFIG system Was simulated during the voltage sag. The simulation results show that the amount of reactive power absorbed by DFIG system from grid can be avoided with the proposed control strategy during voltage sag, which contributes to the recovery of the grid voltage. The effectiveness and correctness of the pro-posed control strategy are verified：

关 键 词：双馈电机 变桨距 CROWBAR STATCOM 低电压穿越 

分 类 号：TM614[电气工程—电力系统及自动化] TP273[自动化与计算机技术—检测技术与自动化装置]