电力系统自动化2017，Vol.41Issue(23)：130-136,155,8.DOI:10.7500/AEPS20170606002
应用于频率宽范围偏移电网的改进相位差校正法
Improved Phase Difference Correction Method Applied in Power Systems with Wide Frequency Offset Range
马也驰 1陈隆道1
作者信息
- 1. 浙江大学电气工程学院,浙江省杭州市 310027
- 折叠
摘要
Abstract
The spectral leakage caused by non-synchronous sampling is the main error source of phase difference measurement. In particular,for the wide range of frequency offset,the conventional phase difference method may make the measurement fail. This paper proposes an improved algorithm based on the conventional phase difference method.The improved algorithm is divided into two steps.Firstly,by analyzing the signal spectrum of the windowing,the polynomial transformation of spectral expression is conducted to speed up the sidelobes decay and further reduce the spectral leakage and the interference between the lines.Secondly,the number of sampling points of the signal to be measured is obtained by estimating the frequency offset range of the fundamental frequency of the grid,and two phase difference methods with different numbers of intercept points in the sampling sequence are employed.The number of intercept points of the second phase difference method is estimated by the fundamental frequency of the first phase difference method,to reduce the spectral leakage caused by the non-synchronous sampling.The simulation is conducted in scenarios of fundamental frequency stability,wide frequency offset range and interference with noise.The simulation results show that the measurement accuracy of the improved electrical parameters is much higher than that of the conventional phase difference method,and the sampling window length satisfies the IEC standard.关键词
谐波测量/频率偏移/非同步采样/相位差法/多项式变换Key words
harmonic measurement/frequency offset/non-synchronous sampling/phase difference method/polynomial transformation引用本文复制引用
马也驰,陈隆道..应用于频率宽范围偏移电网的改进相位差校正法[J].电力系统自动化,2017,41(23):130-136,155,8.
