汽轮发电机三相短路引起的失步仿真及保护

Out-of-step simulation and protection for turbine-generator caused by three phase short-circuit

建立了包括汽轮机、发电机、调速器和励磁调节装置在内的全系统仿真模型,编制了仿真软件,在模拟发电机组上进行了三相突然短路故障引起的失步实验和仿真分析,实验结果验证了仿真结果的正确性。对某电厂300MW汽轮发电机进行了三相短路故障引起失步的仿真研究,并对三阻抗元件失步保护和改进型三阻抗元件失步保护进行了整定计算及分析。

In order to analyze the outofstep dynamic process of turbinegenerator caused by three phase shortcircuit,and to verify the outofstep protection scheme,math models of a generation system are built and the simulative software is programmed,which includes steam turbine,generator,speed governor and field regulator.The outofstep test and simulative analysis are carried out on a simulative generation system in a laboratory and the experimental results verify the correctness of simulation results.The simulative analysis of outofstep process is done for a 300MW turbo generation system.The simulation results are valuable for setting calculation and analysis for the outofstep protection based on the threeimpedance element principle and the improved principle.