Performance Comparison of Different Approaches for State Estimation Using RTU and Phasor Measurements

This paper compares various approaches to implement state estimation with conventional (RTU) measurements and phasor measurements. This study implements two-stage Hybrid State Estimation (HSE) in order to merge RTU and PMU measurements. Non-overlapping approach for area decomposition is applied in this paper. Centralized merging of PMU measurements in the process of HSE is presented to merge conventional measurements and phasor measurements effectively in a distributed network. Further, this study applies linear state estimation in a distributed network in case of full observability with PMU. Performance of state estimator in overall power system network and distributed network is compared for all approaches in terms of mean square error of estimated states and execution time of SE process. The effectiveness of the proposed approach is demonstrated with IEEE 14 bus system and IEEE 118 bus system.