Low-order dynamic equivalent estimation of power systems using data of phasor measurement units |
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Affiliation: | 1. School of Electrical and Computer Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece;2. Power Systems Laboratory, Department of Electrical and Computer Engineering, Democritus University of Thrace, Xanthi 67100, Greece;3. Department of Electrical and Computer Engineering, University of Western Macedonia, Kozani, 50100, Greece;1. School of Information Science and Technology, ShanghaiTech University, Shanghai, China;2. Department of Electrical and Computer Engineering, University of Massachusetts, Lowell, MA 01852, USA |
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Abstract: | This paper utilizes data measured by phasor measurement units (PMUs) to extract a low-order dynamic equivalent model for power system stability studies. The estimated model is a 2-order model for synchronous machines. This model has the advantage of simplicity of classical model and considerably reduces the oversimplifying error of classical model. This method offers an alternative approach to analytical model reduction techniques based on the detailed system models. The proposed method uses the synchronized bus voltage and current phasors measured by PMUs. Using post disturbance data, electrical and mechanical parameters of the equivalent generator are estimated sequentially. Furthermore, a new approach for estimation of two-machine and single machine infinite bus (SMIB) equivalent systems are presented for analysis of electromechanical oscillations. To evaluate the performance of the proposed approach, simulations are performed on a two area 13-bus test system and real measured PMU data. Simulation results show that the estimated model can represent the dynamic behavior of the studied system with good approximation. |
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Keywords: | Phasor measurement unit Model estimation Power system model reduction Power system oscillations |
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