【摘要】 准确、快速地提取出故障电流的特征参数,预测出短路电流的零点,是实现相控开断需要首先解决的核心问题。笔者采用改进的半波傅氏算法,利用半个周波加上2个采样点的数据,通过2次数据处理窗口的移动,提取出短路故障电流衰减直流分量的初值、时间常数、基波及三次谐波的幅值和相位,实现故障电流的零点预测。计算及MATLAB仿真均表明,算法能够快速准确地实现电流零点预测,预测零点与实际过零点之间的误差在±1 ms以内。更多还原

【Abstract】 Rapid extraction of fault current parameters for predicting the zero-cross point of the fault current is a premise in phase controlled interruption of fault current.In this paper,an improved half-wave Fourier algorithm is presented.By adding two extra sampling points and shifting data processing window twice,the algorithm can extract the initial value and time constant of the decaying DC component,and can also extract the amplitudes and phases of the fundamental wave and three-order wave to implement prediction of zero-cross point of fault current.Calculation and MATLAB simulation show that the improved half-wave Fourier algorithm can quickly realize zero-cross point prediction of fault current with errors less than ±1 ms.更多还原