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电网技术  2013 

一种输电线路瞬时故障最佳重合闸时刻实用计算方法

, PP. 635-640

Keywords: 最佳重合闸时刻,扩展等面积法则,暂态动能函数,功率振荡,在线计算

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Abstract:

在交流系统不对称的情况下,三相模块化多电平换流器(modularmultilevelconverter,MMC)内部会出现零序性质的2次谐波环流,该零序分量将进入MMC直流侧,加剧直流电压、电流和功率的2倍频波动。为抑制直流侧功率的2倍频波动,以瞬时功率理论和比例谐振调节器为基础,设计了两相静止坐标系下MMC的控制策略。该控制策略由交流回路控制和直流回路控制2部分构成,前者实现MMC与交流系统之间的功率调节;后者实现MMC内特性的调节,主要抑制MMC环流中的2次谐波成分,使桥臂电流波形接近正弦。仿真系统采用不控整流站,逆变站采用MMC,结果表明在交流系统不对称的情况下,该控制策略有效抑制了环流中的2次谐波成分以及MMC直流侧电压、电流和功率的2倍频波动。

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