一种计及衰减直流分量干扰的动态同步相量测量算法  

A dynamic synchrophasor measurement algorithm considering decaying DC component interferences

作　　者：叶远誉 陈垒[2] 谢潇鹏 熊茹 赵伟[2] Ye Yuanyu;Chen Lei;Xie Xiaopeng;Xiong Ru;Zhao Wei(State Grid Jiangxi Electric Power Co.,Ltd.,Nanchang 330077,China;Department of Electrical Engineering,Tsinghua University,Beijing 100084,China;Beijing University of Posts and Telecommunications,Beijing 100876,China;Power Supply Service Management Center,State Grid Jiangxi Electric Power Co.,Ltd.,Nanchang 330069,China)

机构地区：[1]国网江西省电力有限公司,南昌330077 [2]清华大学电机系,北京100084 [3]北京邮电大学,北京100876 [4]国网江西省电力有限公司供电服务管理中心,南昌330069

出　　处：《电测与仪表》2021年第8期160-165,共6页Electrical Measurement & Instrumentation

基　　金：国家电网有限公司科技项目(52182018000X)。

摘　　要：动态同步相量测量在电力系统动态行为监测中发挥着重要作用。但是当电力系统发生故障时,故障电流中存在的衰减直流分量,会严重影响动态同步相量测量的准确性。对此,提出了一种动态同步相量测量新算法。具体实现上,将衰减直流分量近似表示成一个较低频率的动态余弦分量,再基于频域采样定理,构建含基波分量和动态余弦分量的故障电流信号模型,进而形成了相应的动态同步相量测量新算法。仿真测试结果表明,存在衰减直流分量干扰下,所提出的动态同步相量测量新算法比基于泰勒信号模型的测量算法准确,而且计算量小,适合于在线应用。Dynamic synchrophasor measurements play an important role in dynamic characteristic monitoring of power system.However,when a fault occurs,the decaying DC component in the fault current will have a detrimental effect on dynamic synchro phasor measurement.Aiming at this problem,a novel dynamic synchrophasor measurement algorithm(DSMA)is proposed in this paper.Firstly,the decaying DC component is described as a dynamic cosine component with a small frequency.And then,a fault current signal model containing the dynamic cosine component and the fundamental component is modelled based on the frequency domain sampling theorem.Finally,the DSMA is accordingly proposed.Simulation results show that,when there are decaying DC component interferences,the proposed DSMA is more accurate than the Taylor signal model-based algorithm.Moreover,the computation burden is very low,which makes the proposed DSMA suitable for practical applications.

关 键 词：动态同步相量 衰减直流分量 频域采样定理 相量测量单元 信号建模 

分 类 号：TM76[电气工程—电力系统及自动化]