预防大规模风机连锁脱网事故的区域自动电压控制协调控制策略

大规模风电机组连锁脱网事故是当前国内风电迅速发展过程中出现的新问题之一。针对甘肃酒泉风电基地发生的风电机组连锁脱网事故,分析其典型发展过程及时空尺度,找出导致事故发生的主要原因。在此基础上,针对风电出力的波动性和固定无功补偿投切引起的电压阶跃调整,提出区域自动电压控制（automatic voltage control,AVC）协调控制模式及策略。以河西电网实际运行数据进行电网稳态电压分析以及采用酒泉＂2-24＂脱网事故重演与控制效果仿真验证了该控制模式及策略的有效性和正确性。

Regional AVC Coordinating Control Strategy for Large-Scale Cascading Trip-off Prevention of Wind Turbines

Large-scale cascading trip-off of wind turbine has become the new problem during the fast development of wind farm. Aiming at the cascading trip-off failures frequently occurring in Jiuquan wind farm,this paper analyzed the typical development process and time-spatial frame of the failures to find the main reason. Based on this,according to the fluctuation of wind power and the step changes of voltage caused by fixed reactive power compensation switching,the coordination control models and strategies of regional automatic voltage control（ AVC） were proposed. Finally,the steady- state voltage analysis was carried out based on the real operation data of Hexi power grid,and the feasibility and effectiveness of the proposed models and strategies were verified through the control effect simulation of ‘2- 24’trip-off failure in Jiuquan.