摘要
随着智能电网的发展和智能变电站的增多,非同步采样下电力谐波分析的需求越来越多。非同步采样直接采用DFT/FFT时误差较大,无法得到准确的谐波参数。近年提出的FFT/DFT谱线插值校正法在有间谐波存在的情况下存在原理性缺陷。为此提出一种通过求解多元一阶线性方程组得到谐波幅值和相位的新方法,并提出这种分析方法的快速算法。文中还对此算法的适用性进行分析和讨论。通过仿真,验证在得到信号工频基波频率准确值时该方法可在非同步采样下准确求取谐波幅值和相位,在得到的工频基波频率值误差小于?0.01 Hz时亦可取得远高于国标要求的分析精度。
Along with the development of the smart grid, more and more smart substations have been built, and demand of harmonic analysis for asynchronous sampling is increasing rapidly. The accurate harmonic parameter values can not be obtained by using DFT/FFT for an asynchronous sample sequence analysis because of large errors. The interpolated FFT/DFT is unsuitable for the situation that inter-harmonics exist. In this paper, a calculation method of harmonic magnitudes and phases by solving multivariate order-1 linear equations was proposed. In order to use the method in real-time case, a fast algorithm was also proposed. Moreover, the applicability of the proposed method was analyzed and studied. The simulation results show that the harmonic magnitudes and phases can be calculated accurately with the proposed method using an accuracy fundamental frequency value, and high accuracy harmonic results can be got using an fundamental frequency value with ?0.01 Hz error.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2013年第S1期184-189,共6页
Proceedings of the CSEE
关键词
电力系统
谐波
非同步采样
算法
仿真
power system
harmonics
asynchronous sampling
algorithm
simulation
