Simulation on Three phase Sudden Short Circuit of Turbo generator Based on Time stepping Finite Element Method
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摘要: 基于时步有限元方法分析发电机瞬态过程, 对于改进系统稳定分析中发电机模型具有重要意义。本文采用场路耦合时步有限元方法建立了同步发电机的动态仿真模型, 针对实验室的一台7.5kW非线性发电机模型机三相突然短路进行仿真及实验对比研究。用Prony方法对瞬态电流的仿真及实测结果进行分解, 得到交直流分量, 通过对比分析验证了该动态仿真模型的正确性, 并辨识出时间常数Ta和T′d。进而对不同励磁电流下负载突然短路进行仿真, 得到不同响应的变化趋势。Abstract: Time stepping FEM method being used to analyze transient process of generator has great significance of improving system stability analysis for generator. In this paper, field circuit coupling time stepping FEM method is adopted to establish dynamic simulation model of synchronous generator, and three phase sudden short circuit for a 7.5kW nonlinear generator is simulated. The transient currents acquired by simulation and experiment are decomposed using Prony method, and AC/DC components are obtained. The validity of this dynamic simulation model is verified by comparable analysis, and time constant Ta and T′d are identified as well. Then, through the simulation of load sudden short circuit under different exciting currents, the trend of different responses can be obtained.
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