电工技术学报2017，Vol.32Issue(17)：1-10,10.DOI:10.19595/j.cnki.1000-6753.tces.161219
基于改进DFT的电力系统同步相量测量算法研究
Research on Synchronous Phasor Measurement Algorithm of Power System Based on Improved DFT
摘要
Abstract
Discrete Fourier transform has many advantages,such as easy for embedding,high efficiency,and etc,so it is widely used in synchronized phasor measurement in power system.However,due to the existence of non-synchronous sampling and frequency domain discretization,the spectrum leakage and fence which cause the errors of calculation result will occur when the DFT is used in phase measurement.To solve this problem,in this paper the equations of phase angle error are deduced in the non-synchronous sampling,then the difference of phase angles is utilized to track the frequency of power measurement signal.Accordingly a method of synchronized phasor measurement based on improved DFT algorithm is proposed.The calculation results of improved DFT algorithm are divided into an integer part and a fractional part,and the fractional part is modified by the equivalent replacement.The simulation results show that the method has higher accuracy and anti-jamming capability,and the performance has greatly improvement compared with the traditional algorithm.On this basis,a phasor measurements unit hardware system is designed by using TMS320F2812.Utilizing it,accurate measurement results of frequency,amplitude and phase angle are obtained.关键词
离散傅里叶变换/频谱泄露/栅栏效应/同步相量测量/同步相量测量装置Key words
DFT/spectrum leakage/fence effect/synchronous phasor measurement/PMU分类
信息技术与安全科学引用本文复制引用
金涛,陈毅阳,段小华,唐晓艳..基于改进DFT的电力系统同步相量测量算法研究[J].电工技术学报,2017,32(17):1-10,10.基金项目
欧盟FP7国际科技合作基金(909880)、国家自然科学基金(61304260)和福建省杰出青年科学基金(2012J06012)资助项目. （909880）
