直流输电系统换相失败的研究(一)——换相失败的影响因素分析

Research on commutation failure in HVDC transmission system Part 1:Commutation failure factors analysis

作为直流输电系统最常见的故障之一,换相失败与很多因素有关,主要有换流母线电压、换流变压器变比、直流电流、换相电抗、越前触发角、不对称故障时换相线电压的过零点相位移、换流阀的触发脉冲控制方式和交流系统的频谱特性等,以CIGREHVDC标准模型为研究对象比较详细地分析了以上因素对逆变器换相失败的影响,得出了逆变器发生换相失败的一般规律。

Commutation failure,one of the most common faults in HVDC(High Voltage Direct Cur-rent )system,is related to many factors,such as voltage of commutation bus,ratio of converter trans-former,DC current ,firing angle,commutating voltage zero-crossing phase shift for system unsymmet rical fault,firing pulse control system of converter,AC system frequency spectrum and so on.Based on the CIGRE HVDC benchmark model,the affect of these factors on commutation failure in the inverter is analyzed in detail and the general rules of commutation failure are obtained.