千兆瓦静态励磁发电机高频轴电流调谐滤波器研究

在大型发电机广泛应用的静态励磁系统晶闸管换相引发幅值较高的高频轴电压脉冲,使得轴电压成为影响大型发电机安全可靠运行的主要问题之一。文章在现场实测1 000 MW发电机轴电压的基础上,建立了基于Matlab Simulink Power System的大型静态励磁发电机轴电压仿真模型,分析得出静态励磁系统输出共模电压基频及其奇次高频谐波轴电压应为大型汽轮发电机轴电压的防治重点,研究提出了一种选择滤除千兆瓦静态励磁发电机高频轴电流的调谐滤波器,仿真表明该滤波器对所选择的高频轴电流滤除效果良好。

Research on Tuned Filter for Reducing High Frequency Shaft Current of 1000MW Generator with Static Exciter

The static excitation system with the thyristor widely used in large generators may cause the higher amplitude high with frequency shaft voltage pulse.High frequency shaft voltage pulse has become one of the main problems that affect the safe and reliable operation of large generator.The field measurement results of the 1 000 MW generator shaft voltage are analyzed, and the simulation model of the large static excitation generator shaft voltage based on Matlab Simulink power system is established.It is concluded that the fundamental frequency and its odd harmonics of the common mode voltage output by the static excitation system are the key points for the prevention and control of the shaft voltage of large turbo generator.A tuned filter reducing the shaft current of 1 000 MW generator with static exciter is presented in this paper.The simulation results show that the filter has good effect on reducing the selected high frequency shaft current.