Research into Harmonic State Estimation in Power System Based on PMU and SVD

Abstract

The traditional least squares estimation and advanced methods usually make asynchronous measurement to the harmonic signals, then to solve a giant over-determined linear equations with real variables. But these methods have some defects of the low estimated accuracy, tremendous calculation quantity and expensive measure cost. The paper develops a harmonic state estimation method based on PMU (phasor measurement unit), and solves ill-conditioned system of linear equations with complex variables in a way of complex singular value decomposition (CSVD). The formulation shows that the proposed approach results in well solution of the problem due to the traditional harmonic state estimation.