Determinação da Capacidade de Observação de Sistemas de Medição para a Estimação de Estado em Redes de Potência

Abstract

State estimation (SE) has established itself as a necessary functionality for the safe and reliable operation of electrical networks. It is responsible for obtaining the most likely operational state of the system through the processing of available measurements (state observations), mitigating the uncertainties present in the measurement process, and rejecting gross errors. This article focuses on determining the system state observation capability established by the measurement system. For this purpose, it is proposed to use the concept known as first passage/arrival/hitting time, i.e., the one necessary for a process, leaving a known initial state, to reach a specific condition for the first time. Applied to the SE problem, this concept can be translated into a strength index of a measurement system capable of resisting the unavailability of measurements until the unobservability barrier is reached for the first time. Numerical results from simulation studies illustrate the use of the proposed index.