Comparison of Different Techniques for Power System State Estimation

Abstract

A power system state estimation is one of the most important applications in the power system control center. Power systems are continuously monitored in order to determine a reliable data of the state variables. Conventional power system state estimators, which are iterative and less accurate, are subject to important changes because of the extensive use of Phasor Measurement Units (PMUs). Although there are many advantages related to their use, PMUs are highly expensive and cannot be implemented at all buses. Therefore, it is very important to find an optimal number of PMUs and their locations in power system to achieve full observability. This paper presents an overview of different techniques for power system state estimation. It also investigates the outcomes of including PMUs in conventional state estimation process. The effectiveness of the proposed state estimation techniques is validated using IEEE test system with 14 buses.