一种适用于同步相量测量的新算法

在异步采样的情况下,离散傅里叶变换(DFT)由于频谱泄漏及栅栏效应,计算结果不够精确,不能满足同步相量测量精度的要求。对现有的同步采样及误差消除方法进行了分析,提出了一种新的相量测量算法。通过线性插值计算,得到采样序列两相邻过零点进行频率跟踪,由所测频率对采样序列进行同步修正得到满足同步采样的新序列,采用DFT进行相量估计。仿真结果表明:该算法具有高精度、计算量小等特点,能够满足同步相量测量对精度及实时性的要求。

A new phasor estimation method for synchronized phasor measurements

The result of Discrete Fourier Transform(DFT) in asynchronous sampling is not accurate and can not satisfy the requirement of synchronized phasor measurements,due to spectral leakage and barrier effect.This paper analyzes several methods of synchronous sampling and error eliminated and proposes a new phasor estimation method.The proposed method obtains two adjacent zero-crossing points of sampling series by linear interpolation method for frequency tracking,amends the sampling series to get satisfied synchronous sampling,and computes the new series for phasor estimation by DFT as well.The simulation shows that the method has a notable accuracy improvement,and adds little calculation burden than traditional DFT.The favorable performance satisfies the demand of] accuracy and real-time of synchronized phasor measurements.