The Research Of Algorithm Of Weighted Least Square With Constraints In State Estimation

At present, all levels of the electrical network automation systems have adopted SCADA, and the application software is needed urgently. Among these power application softwares ( PAS ), the state estimation is playing a very important role in providing a rich, accurate and reasonable data for PAS.The power system state estimation involves network topology, network observability analysis, state estimation and detection and identification of bad data. The result of state estimation is returned to SCADA as a replenishment of the data in SCADA.The paper carries on the research of network topology, algorithm of state estimation and detection and identification of bad data, and applies the method of tracking search to network topology, semi-dynamic optimization to node numbering, algorithm of weighted least-squares with constraints to state estimation and rN to detection and identification of bad data. The calculation is made for Jinzhong's electrical network according to its circumstances in Shanxi. The result of calculation is reasonable and accurate, which shows that the procedure possesses good practicability.