A partitioning strategy for improved state estimation performance in ill-conditioned power systems with hybrid measurement set

Date

2021-12-01

Author

Yildiz, Tuna
Açılan, Etki
Göl, Murat

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Considering the increase in power system size and the number of PMUs, the utilization of a computationally efficient yet accurate static state estimator is crucial. The fast-decoupled WLS estimator (FD-WLS) is the most common method employed in industrial applications, thanks to its computational efficiency and ease of implementation. However, it is known that FD-WLS fails in the presence of an ill-conditioned power system, e.g., a power system with high R/X ratio and large difference between measurement error variances. This paper proposes a partitioning strategy for ill-conditioned power systems. The proposed method forms two types of subsystems, such that one can apply FD-WLS in the type-1 sub-systems, and conventional formulation of WLS should be applied in the type-2 sub-systems. The utilization of the proposed method enables a computational performance comparable to that of FD-WLS and an accuracy comparable to that of the centralized solution.

URI

https://hdl.handle.net/11511/94556

Journal

ELECTRIC POWER SYSTEMS RESEARCH

DOI

https://doi.org/10.1016/j.epsr.2021.107515

Collections

Department of Electrical and Electronics Engineering, Article

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Citation Formats

T. Yildiz, E. Açılan, and M. Göl, “A partitioning strategy for improved state estimation performance in ill-conditioned power systems with hybrid measurement set,” ELECTRIC POWER SYSTEMS RESEARCH, vol. 201, pp. 0–0, 2021, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/94556.