PMU-Based System Identification for a Modified Classic Generator Model

Abstract—The paper proposes to use PMU measurements (voltage phasor, real and reactive powers) for system identifi-cation. A second-order synchronous generator model with real and reactive power as input and voltage phasor as output will be developed in this paper based on the two-axis synchronous generator dynamic model. Parameters of the model will be identified based on the PMU measurements using least square estimation technique. Two case studies are presented: a syn-chronous generator estimation and a power subsystem estimation. In both cases, the system will be represented by the proposed model with parameters identified from PMU measurements. Time-domain simulation results will validate the accuracy of the proposed model and its identification. The contribution of this paper is twofold: i) A model suitable for PMU measurement based identification is developed; ii) better accuracy of system parameter estimation can be achieved using the proposed model compared to the classical model. Index Terms—Least square estimation, parameter estimation, synchronous machine, system identification. I