中文摘要：

由于受扰系统在故障切除后恢复过程中出现高电压引起风电机组大规模脱网的事故近年来频发,因此基于近年来已发生的大规模风电机群脱网事故,从风电机组故障穿越期间动态无功控制策略和风电场附加无功补偿装置控制特性两个方面分析了受扰后电网发生高电压现象的主要原因,并通过现场测试验证了机组动态无功控制策略对机端电压的影响。在此基础上,提出了避免风电机组高电压脱网的协调预防控制策略,即风电机组在满足高电压穿越要求的前提下根据电压变化参与系统无功调节,风电场附加无功补偿装置根据并网点电压以及场内机组脱网情况实现快速调节和退出。最后,通过仿真验证了协调预防控制策略的有效性。

英文摘要：

Based on recent years”frequent outage of large scale wind power by high voltage during voltage recovery period after grid fault,the high voltage phenomena after grid fault is analyzed from two aspects,one is the dynamic reactive power control strategy during low voltage ride through (LVRT) of wind turbines,the other is control characteristics of reactive power compensation devices in wind farms.It is verified by field test data on wind turbines that the dynamic voltage control strategy could affect terminal voltage of wind turbines.Based on the analysis,this paper presents a coordinated prevention and control strategy to avoid outage of large scale wind power resulting from high voltage.The wind turbines which fulfill the high voltage ride through(HVRT) requirements would regulate the reactive power of power system according to the fluctuation of wind turbine terminal voltage.The reactive power compensation devices in wind farms would realize fast regulation and outage according to the fluctuation of system voltage and the outage saturation of wind turbines in wind farms. Finally, the coordinated prevention and control strategy is validated by simulation results.