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高压电器  2014 

基于Prony的故障电流相控分断零点预测算法

, PP. 29-34

Keywords: 过零点,故障电流相控开断,Prony算法,安全点算法

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Abstract:

目标过零点的快速、准确预测是实现短路故障电流相控开断的基础。笔者根据短路电流信号特点,提出将Prony算法应用于故障电流相控分断时的零点预测。推导了Prony算法的求解过程,通过计算频率、幅值、相位等参数,得到采样信号的还原波形,进而求取目标电流零点。在MATLAB中设置理想信号进行算例验证,结果说明Prony算法的参数计算误差小,波形拟合度高。在谐波环境下,采用1/4周期长数据与安全点算法进行了对比。结果显示,相比安全点算法,Prony算法对谐波更加稳定,波形拟合精度更高。

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