电力交流量测量的一种误差插值补偿算法

An Error-complementing Interpolation Algorithm in Measurement of AC Signals

针对现有电力交流信号实时测量算法的不足,提出了一种误差插值补偿算法,此算法综合考虑了频率偏移、波形失真和幅值波动的多重影响,根据事先建立的离线误差补偿表和误差-影响因子数值偏微分表,以及线性插值的思想,对FFT或RDFT算法测量结果先进行查表而后插值实现在线的误差补偿。通过仿真结果发现,算法的幅值相对误差小于0.6%,相位误差小于2.3°。测量精度比FFT或RDFT有显著提高。本算法容易实现实时,可以满足电力系统实时数据采集的需求。

Aiming at the shortage of algorithms in real-time measurement of AC signals, an Error-complementing Interpolation Algorithm is discussed in this paper. Taking account of frequency drift, waveform distortion and fluctuation of crest value synthetically, and according to the established off-line Error-complementing Table and Error Factors Partial Differential Table as well as utilizing linear interpolation, the algorithm firstly looks up the tables, then processes real-time error-complementing. The simulation results show that the relative error of amplitude is less than 0.6% and the error of phase is less than 2.3°. Precision of this algorithm is more improved than that of FFT or RDFT. It is undemanding to implement and can fulfill the needs of real-time data acquisition in power system.