Design of State Estimator Measurements Based on Condition Indicators

Abstract In contemporary power systems, consideration may be given to added measurements for the purpose of improving the performance of an existing state estimator. The considered addition may be a measurement of a state (e.g., bus voltage phase angle or bus voltage magnitude). In this article, the condition number and other algebraic indicators of state estimator performance are studied with regard to added state measurements in an existing power system state estimator. The concept of a condition indicator is introduced, and this includes a study of certain elements of the singular spectrum of the state estimator process matrix. Eigenvalue sensitivity analysis is used to improve the condition indicators. Examples are shown to illustrate the concept. The analysis also shows that the concept of using condition indicators for measurement placement is consistent with redundancy analysis. The purpose of a study of condition indicators is to supplement measurement placement algorithms.

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