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双馈风电机组短路电流对变压器保护二次谐波制动的影响

DOI: 10.13334/j.0258-8013.pcsee.2014.13.023, PP. 2201-2209

Keywords: 双馈风电机组,变压器保护,二次谐波制动,短路电流,矢量控制

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Abstract:

二次谐波制动是避免励磁涌流造成保护误动,从而保障电力变压器保护可靠动作的关键技术措施.为验证大规模双馈风电机组接入电网后对变压器二次谐波制动正常运行可能造成的影响,研究了电网对称故障下双馈风电机组短路电流的谐波特性.基于转子侧变流器控制对定子短路电流谐波特性的影响分析,解释短路电流二次谐波的产生机理并推导二次谐波的解析表达式,指出在变流器矢量控制下双馈风电机组产生的短路电流二次谐波可能威胁变压器二次谐波制动的可靠运行,并通过短路实验和时域仿真验证了分析的正确性.

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