Dynamic State Estimation of Synchronous Generator Rotor Angle Using PMU and EKF Under Stressed Conditions

摘要

This paper deals with monitoring the synchronous generator's rotor angle under healthy and faulty conditions in the power system. The method used to estimate the synchronous generator rotor angle by extended Kalman filter (EKF) technique and phasor measurement unit (PMU). The proposed algorithm helps us to understand the stability of the system by observing the rotor angle dynamically. Apart from just monitoring, it is proposed to be used as a backup protection in case, the relay fails to operate and issue trip signal under stressed conditions in transmission line. Thus, it helps to protect the generator to go out of synchronism under any kind of mal-operation in the transmission line. Robustness of the proposed algorithm is validated on the single-machine infinite-bus and Western System Coordinating Council (WSCC)-9 bus system. The obtained results are quite accurate and therefore can be relied upon to perform dynamic-state estimation in real time and help to protect the system to maintain stability.