A Novel Approach for Dynamic State Estimation with Synchrophasor Measurements

Conference: Internationaler ETG-Kongress 2013 – Energieversorgung auf dem Weg nach 2050 - Symposium 1: Security in Critical Infrastructures Today
11/05/2013 - 11/06/2013 at Berlin, Deutschland

Proceedings: Internationaler ETG-Kongress 2013 – Energieversorgung auf dem Weg nach 2050

Pages: 6Language: englishTyp: PDF

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Authors:
Chen, Liang; Bi, Tianshu; Xue, Ancheng; Yang, Qixun (State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing, China)

Abstract:
Synchrophasor measurements have been widely used in power system dynamic monitoring and control, such as low frequency oscillation identification and damping control, stability assessment and preventive control, etc. However, as a measurement tool, phasor measurement unit (PMU) unavoidably experiences the measurement error and bad data, especially in the dynamic process. If the raw measurements are applied in power system analysis and control directly, the unexpected consequence may be resulted in. Aiming at this problem, a novel dynamic state estimation method considering speed governors in electromechanical transient process is presented in this paper. The detailed mathematical model of speed governors and the schematic diagram of the presented method are given. The unscented Kalman filter (UKF) is suggested to solve the proposed estimation problems due to its advantage for solving nonlinear filtering problem. The simulations show that the accuracy of the proposed method is higher than the method that the mechanical torque is assumed to be constant.