200 kV阻容分压式直流电压互感器阻抗匹配

Impedance matching of 200 kV DC voltage transformer based on resistance-capacitance divider

为了研究200 kV阻容分压式直流电压互感器内部的阻抗匹配情况,分析了阻容分压式直流电压互感器的工作原理,基于实际参数建立了互感器的MATLAB仿真模型.互感器内部阻抗匹配效果不佳,不能完全消除振荡,需增加更有效的阻抗匹配措施.采用低通滤波器作为有效阻抗匹配的措施,并通过对比分析不同滤波器的阻抗匹配效果.结果表明,与RC无源滤波器相比,二阶巴特沃斯滤波器滤波特性更优,性能更稳定,是更可靠、有效的阻抗匹配措施.

In order to study the internal impedance matching of 200 kV DC voltage transformer based on resistance-capacitance divider,the working principle of DC voltage transformer based on resistance-capacitance divider was analyzed,and the MATLAB simulation model for the transformer was established in terms of actual parameters.The internal impedance matching effect of transformer was not good,the oscillation could not be completely eliminated,and more effective impedance matching measures are necessary.A low-pass filter was proposed as an effective impedance matching measure,and the impedance matching effect of different filters was analyzed through comparison.The results show that the second-order Butterworth filter has better filtering characteristics and more stable performance,which can be a more reliable and effective impedance matching measure compared with RC passive filters.