南方电网技术2017，Vol.11Issue(7)：58-67,10.DOI:10.13648/j.cnki.issn1674-0629.2017.07.010
基于CML的配电网μPMU相量测量算法
CML BasedμPMU Phasor Measurement Algorithm for Distribution Network
摘要
Abstract
Distribution network is seriously affected by harmonics and noise, the calculation of voltage phasor is more difficult, and the traditional phasor measurement accuracy of power transmission network can not satisfy the demand of distribution network.In order to improve the measurement accuracy of voltage amplitude and phase angle of distribution network, a method based on conditional maximum likelihood estimation ( CML) is proposed for measuring the phasor of micro-synchronous phasor measurement unit (μPMU) in distribution network.The algorithm establishes the signal model of three-phase unbalanced system.When the measurement is up to two unknowns and the orthogonal value of the measured matrix and the unit matrix is not equal to zero, the feature which the three-phase matrix is orthogonal to the eigenvector of the sample covariance matrix is used to obtain the measurement.Furthermore, the am-plitude and phase expression of the voltage phasor are deduced by the geometric characteristic, which reduces the computational com-plexity.Simulation test is carried out by Matlab, and the simulation results show that the proposed method can improve the measure-ment accuracy of the voltage amplitude and phase angle of distribution network to a certain extent.关键词
配电网/μPMU/三相不平衡系统/条件最大似然估计Key words
distribution network/μPMU/three-phase unbalanced system/conditional maximum likelihood estimation( CML)分类
信息技术与安全科学引用本文复制引用
李江,魏文震,陈继开..基于CML的配电网μPMU相量测量算法[J].南方电网技术,2017,11(7):58-67,10.基金项目
国家重点研发计划资助项目(2016YFB0900903).Supported by the National Key Research and Develop-ment Program of China (2016YFB0900903). （2016YFB0900903）
