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《Advanced Technology of Electrical Engineering and Energy》 2008-02
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Study of phasor measurements based power system harmonic state estimation algorithm

HOU Shi-ying~1,WANG Yao~1,ZHU Shi-hou~1,WAN Xin-yun~2,PENG Wen-xiong~1(1.State Key Laboratory of Safety and New Technology of Power Transmission & Distribution Equipment and System,Chongqing University,Chongqing 400030,China;2.Elec.Power Design Inst.of Danyang,Jiangsu Power Zhenjiang Suburb Supply,Danyang 212300,China)  
With the rapid development of phasor measurement technology,power system harmonic state estimation based on PMU(Phasor Measurement Unit) has its own characteristic that node votage phasors can be chosen as state variables and branch current phasors,node votage phasors and injected current phasors can be selected as measurement variables,and the state equations become linear equations.According to this characteristic this paper combines the different measurement schemes,using Cholesky decomposition algorithm,to solve overdetermined and basic measurement equations,and its computational complexity is just a half of the Gauss elimination method and it is not necessary to select main element which accelerate the computation speed greatly.Singular value decomposition is used to solve underdetermined measurement equations.It offers not only a steady least square solution for power system,but also identifying the observability of power system,which simplifies analytical procedure greatly.At last the simulation and programming indicate the effectiveness and reliability of the two algorithms.
【CateGory Index】: TM744
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