Study on Maintenance Methods of Power System State Estimation

Aiming at the issue of state estimation maintenance difficulties in power dispatching, this paper studies the systemic maintenance methods of state estimation for large regional, provincial and district control center, including equivalence of interior and exterior network, countermeasure of active and reactive estimation divergence as well as the methods for increasing state estimation eligible rate. A practical reactance-estimation method of loop network with matrix calculation is proposed. This method can employ the software such as Scilab Program to implement straight forward, and the results on China Southern Power Grid show that the proposed systemic maintenance method is reasonable and feasible.