双馈电机风电场等裕度无功分配策略  

Reactive power distribution in equivalent margin of a wind farm with doubly fed induction generators

作　　者：栗然[1] 唐凡[1] 刘英培[1] 张孝乾[1] 

机构地区：[1]华北电力大学电气工程学院,河北保定071003

出　　处：《中国电力》2011年第8期57-61,共5页Electric Power

摘　　要：双馈式异步发电机可实现P-Q解耦控制,能够为电网提供无功支持,但其输出功率受变流器容量限制。为充分发挥双馈机无功调节能力,提出等裕度无功分配策略:根据各台风机无功极限的大小,以各机组具有相同的无功裕度作为无功分配的标准。该策略能够使风电厂在满足电网功率因数要求的同时,有效防止有功出力较大的双馈机由于变流器电流越限而发生跳机的现象,提高风电场运行可靠性。采用PSCAD/EMTDC软件进行仿真研究,通过与等功率因数无功分配策略进行比较,验证了等裕度无功分配策略的有效性。Doubly fed induction generators （DFIGs） can provide reactive power support for the grid by P-Q decoupled control. The reactive power is limited by the converter capacity. A reactive power distribution in equivalent margin （RPDEM） strategy was proposed for reactive power distribution among DFIGs. Reactive power is allocated with the same margin according to the unit reactive power limit. The distribution algorithm can effectively prevent generators with large active power output from tripping as a result of converter overcurrent while meeting the power factors of the grid and improve the reliability of wind farm operation. The model of wind farms with DFIGs was established in PSCAD / EMTDC. The simulation results show that compared to reactive power distribution in equivalent power factor （RPDEPF） strategy, the proposed method is effective.

关 键 词：风电场 双馈式异步发电机 等裕度无功分配 无功裕度 恒功率因数 

分 类 号：TM614[电气工程—电力系统及自动化]