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计及低穿控制的混合型风电场短路电流特性与故障分析方法研究

, PP. 99-110

Keywords: 风电场,双馈风力发电机组,永磁风力发电机组,短路电流计算,故障分析

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Abstract:

不精确的短路电流计算会影响故障分析的结果,进而使保护动作特性的评估产生误差。针对以往研究中未考虑风电场中风机类型多样性、无法准确等效风电场的故障暂态过程等问题,考虑了故障期间控制策略对风力发电机组暂态过程的影响,建立了双馈风力发电机组与永磁风力发电机组的单机等效模型,采用分群聚合等效的方法,提出了含多类型风力发电机组的风电场简化等效模型。进一步分析了故障期间短路电流的变化机理,给出了混合型风电场的短路电流计算方法。采用实时数字仿真器(RTDS)建立含多类型风机的物理实验平台,验证了所提风电场短路电流计算方法的准确性,并在此基础上对风电场接入的电网故障分析方法进行了探讨与分析。

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