动态条件下的同步相量测量算法的研究

Research on Synchronized Phasor Measurement Algorithm Under Dynamic Conditions

考虑到电力信号的动态特性,利用泰勒级数对电力信号的时变相量进行建模,并利用相邻采样数据窗的相量测量值来表示相量导数,以此相量导数来修正系统动态特性对相量测量精度的影响。仿真计算以及现场数据的分析研究表明:该同步相量测量算法提高了多种动态条件下(如低频振荡和频率偏移等情况)对信号相量进行测量的精度,与传统相量测量方法相比,虽然运算量有所增加,但仍能够满足现场在线应用的要求。

To improve the accuracy of synchronous phasor measurement, Taylor serial was employed to model dynamic power signals. The dynamic characteristics of power signals were expressed by Taylor serial＇s derivatives, which were calculated from consecutive phasors. The derivatives can be employed to reduce the impact of system dynamic characteristics on accuracy of phase measurement. Simulation results and analysis of power system data show that the proposed algorithm can improve the accuracy of phasor measurement when the power system is in a dynamic process, such as low frequency oscillation, frequency deviation and so on. Compared to traditional methods, the calculation takes more time while can meet the requirement of application in power system.