适用于双馈风电场并网的自适应距离保护

An Adaptive Distance Protection for DFIG Wind Farms

文章利用Prony算法分析了双馈风电并网联络线故障时故障电压电流的频率成分,提出了一种适用于双馈风电并网的固有频率与特征频率相结合的自适应距离保护,该保护采用圆阻抗特性,自适应于发电机故障前转速值,充分利用了故障分量里的工频分量和非工频分量,可正确反应故障。并在PSCAD\EMTDC仿真平台上搭建了双馈式风电场电磁暂态模型进行仿真验证,结果表明,该原理能正确判断风电场送出线故障,对风电接入系统时有效地提高继电保护的正确动作性能具有参考意义。

This paper analyzes the frequency to components of the fault current and and voltage using prony algorithm.An adaptive distance The protection is proposed combine the the natural frequency the characteristic frequency for DFIG wind farms.proposed use protection power adjusts round impedance and characteristic adaptively with pre-fault generator usually speed,making full of and the frequency frequency line component mode the non-power frequency on component.DFIG operates show at the variable principle speed can constant in normal conditions.can Base as this,PSCAD simulation results that correctly judge faults.This principle be used reference to improve the performance of relay protection.