Power System Dynamic Phasor Extraction Method Based on Prony and Improved State Model

In order to improve the accuracy of dynamic phasor analysis of power system with harmonic and decaying DC components, a method of dynamic phasor extraction based on Prony and improved state model is proposed. Prony algorithm model can describe the dynamic phasor signal characteristics of power system accurately and extract the fundamental frequency components directly. In this paper, the first-order difference algorithm is used to filter the decaying DC component. Prony algorithm is used to extract the fundamental frequency component, and the dynamic phasor measurement method of the phasor measurement state model of the improved Kalman filter is used to estimate the extracted signal. The simulation results show that the proposed method can effectively separate the DC component and estimate the phasor value.