Topology error identification by least absolute value state estimation

This paper describes an approach by which the status of circuit breakers which are not directly monitored can be determined. The approach combines a previously proposed circuit breaker model with the least absolute value (LAV) state estimation method for this purpose. The ability of the LAV estimators to reject inconsistent measurements is exploited in order to decide whether a circuit breaker is closed or open. The formulation of the LAV state estimation is accordingly modified to include the circuit breaker models and associated constraints. The proposed approach is implemented and tested. Simulation results for single and multiple circuit breaker configurations are given. Robustness of the approach against analog measurement errors is also demonstrated by examples