Analysis of influencing factors in hybrid state estimation

Hybrid state estimation has become a significant tool to utilize PMU measurements in modern power dispatch center. Factors affecting estimation accuracy are discussed in this paper, including measurement number, PMU number and measurement uncertainty. And it also explores the extent of impacts with simulation results. PMU current phasors are transformed into pseudo power injections and their uncertainties are calculated by uncertainty propagation theory. PMU numbers and their optimal deployment are determined by integer quadratic programming approach. Monte Carlo simulations are carried out in IEEE 14-bus system in this paper.