New Topological Observability Algorithm for Hybrid Power System Static State Estimation

This work presents a new observability algorithm to strengthen the performance of the hybrid power system static state estimation, assuming that the supervisory control and data acquisition (SCADA) and phasor measurement units (PMUs) are recorded at the same time intervals. The observability of each estimated state variable is assessed by the value assigned to the least local redundancy index of that state variable. The algorithm has been specifically developed to enhance the observability of an existing wide-area monitored system and exempts its expansion from critical sets and critical measurements. These objectives are achieved by building the incidence matrices of the measurements to the nodes and branches. The performance of the proposed algorithm is evaluated using the IEEE test systems and the Brazilian equivalent systems.