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《Power System Technology》 2012-04
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An Approach for Electromagnetic Transient Simulation of Power Transformers With Nonlinear Exciting Branch

ZHU Yi1,FANG Dazhong1,WANG Qingping2 (1.Key Laboratory of Power System Simulation and Control(Tianjin University),Ministry of Education,Nankai District, Tianjin 300072,China;2.China Electric Power Research Institute,Haidian District,Beijing 100192,China)  
A model for electromagnetic transient simulation of power transformer containing nonlinear exciting branch is built and the inrush current of power transformer under no-load switching is simulated by a simple simulation circuit.Applying piece-wise linearization the nonlinear phenomenon appeared in exciting branch of power transformer is processed and by means of simulation results under various simulation step lengths the overshoot appeared due to long step length adopted in piece-wise linearization is explained.The overshoot can be effectively limited by decreasing the step length,however the time for the simulation is evidently increased.On the basis of piece-wise linearization a predictor-corrector method is proposed to ameliorate the overshoot.A predictor-corrector module is added into the electromagnetic transient simulation program for power transformer,thus without changing step length the overshoot is overcome and the simulation process is accelerated.Simulation results verify the correctness and effectiveness of the proposed transformer model and the predictor-corrector method.
【Fund】: 国家自然科学基金项目(50777046);; 国家重点基础研究发展计划项目(973项目)(2009CB219700)~~
【CateGory Index】: TM402
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