滤除衰减非周期分量的微机保护算法研究

寻找合适的算法是微机保护的一个重要任务。作者的目的是在目前国内外有关微机保护算法的文献中寻找一种兼顾精度与速度，并适合微机保护的“最佳”算法。为此通过大量的仿真计算，对各种算法的计算精度与计算速度进行了对比。首先给出微机保护常用算法中傅里叶算法及改进傅氏算法、卡尔曼算法和递推最小二乘算法对含非周期分量故障信号计算方法，分析各算法的误差来源和频谱特性，然后进行仿真计算方法，分析各算法误拳来源和频谱特性，然后进行仿真计算，在采样率分别为12点／周、20点／周40点／周上，在80P51XA16位单片机上各算法的计算精度进行了对比计算。得出了采用并联补偿的傅氏算法且选择采样率为20点／周的方案是能兼顾精度与速度的“最佳”组合方案的结论。

STUDY ON PROTECTIVE ALGORITHM FOR ELIMINATION OF DECAYING APERIODIC COMPONENT

To seek an appropriate algorithm is an important task for microprocessor-based protective relaying. The aim of this paper is to seek a “best” algorithm which can meet the need of both accuracy and speed from the literatures home and abroad. For this purpose, a lot of simulation calculations are carried out, then the calculation speed of diversified algorithms and the accuracy of the results are compared. In this paper firstly the calculation method for signals including aperiodic component based on the algorithms such as the Fourier algorithm and the improved Fourier algorithm, Kalman filter algorithm and recursive least square algorithm are given, the source of errors and the characteristics of frequency spectrum are analyzed, the frequency responses of various algorithms are presented, then the simulation calculations are performed. Under different sampling rate 12point/cycle, 20point/cycle and 40point/cycle, the comparison calculations for calculation precision and speed of the applied algorithms are carried out by 80P51XA 16-bit single chip computer, and the claulation results are given. Thereby, the conclusion is obtained: under the sampling rate of 20 point/cycle the compensated Fourier algorithm would be the best combining algorithm.