Optimal Placement of Phasor Measurement Units for Harmonic Source Identification

Abstract

The nonlinear loads causes harmonic pollution in electrical power system. These harmonics or harmonic components affect the performance of power system components as well as the com- ponents causing harmonics. The line admittances get modified to unacceptable limits which thereby results in error during fundamental load flow calculations. In this dissertation, an ef- ficient methodology to determine the harmonic sources and their injection levels has been im- plemented. The measurement data of phasor measurement units (PMUs) are considered as the time synchronised voltage and current phasor values of buses. Because of high cost associ- ated with PMUs, optimal placement of PMUs has been investigated with index method, genetic method and binary particle swarm optimization approaches. The harmonic identification ap- proach utilizes the direction of harmonic power flow at system buses. The effectiveness of the formulations is studied on 18-bus and 69-bus radial distribution systems and compared. The simulation is implemented in MATLAB.