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  

Effect of Doubly-fed Wind Turbines Short-circuit Current on Second Harmonic Escapement of Transformer Protection

作　　者：熊小伏[1] 齐晓光[1] 欧阳金鑫[1] 

机构地区：[1]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆市沙坪坝区400030

出　　处：《中国电机工程学报》2014年第13期2201-2209,共9页Proceedings of the CSEE

基　　金：重庆大学输配电国家重点实验室资助重点项目(2007DA10512711102)~~

摘　　要：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。Second harmonic escapement can prevent the transformer protection from maloperation arising from the magnetizing inrush current, which is an essential measure to ensure the reliability of transformer protection. To analyze the effect of short-circuit current of doubly-fed wind turbine on second harmonic escapement of transformer protection, this paper studied the harmonics characteristics of stator short-circuit current of doubly-fed wind turbine under symmetrical faults. Based on the impacts of rotor-side converter on the harmonic components of stator short-circuit currents, the generating mechanisms and analytical expression of stator second harmonic currents were proposed. It is pointed out that with the vector control of converter, the stator short-circuit current of doubly-fed wind turbine may cause the maloperation of the second harmonic escapement of transformer protection. The theoretical analyses were verified by several examples of short-circuit test and simulation results.

关 键 词：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 

分 类 号：TM77[电气工程—电力系统及自动化]