换流站开路试验分析及建议

Analysis and suggestions on open line test of converter station

本文介绍直流输电开路试验的作用和原理,研究了触发延迟角和阻容参数对开路电压的影响。由于直流系统配置的开路试验电压保护基于理想模型计算,与实测电压相差较大,实际未投入。本文提出一种替代原有电压保护的策略,根据实测电压计算阻容参数值,可预判试验能否成功,避免进一步减小触发延迟角造成击穿而损坏设备。

This paper introduces the function and principle of DC transmission open line test,and studies the influence of trigger angle and resistance-capacitance parameter on open line voltage.Because the open line test voltage protection configured by the DC system is based on the ideal model calculation,which is quite different from the measured voltage,it is not actually put into operation.In this paper,a strategy to replace the old voltage protection is proposed,the resistance-capacitance value is calculated according to the measured voltage to predict whether the test can succeed,and avoid further reducing the triggering angle to cause breakdown and equipment damage.