不同动态无功补偿装置对直流系统故障引发送端暂态过电压的抑制效果对比  

Comparison of Suppression Effect of Different Dynamic Reactive Power Compensation Devices for Transient Overvoltage Caused by HVDC System Faults

作　　者：林安妮 黄永章[1] 林伟芳[2] 孙华东[2] 易俊[2] LIN Anni;HUANG Yongzhang;LIN Weifang;SUN Huadong;YI Jun(State Key Laboratory for Alternate Electrical Power System With Renewable Energy Sources,North China Electric Power University,Beijing 102206,China;China Electric Power Research Institute,Beijing 100192,China)

机构地区：[1]华北电力大学新能源国家重点实验室,北京102206 [2]中国电力科学研究院,北京100192

出　　处：《电力电容器与无功补偿》2020年第4期116-122,共7页Power Capacitor & Reactive Power Compensation

基　　金：国家电网公司科技项目(XT71-18-041)。

摘　　要：直流输电系统在发生换相失败、直流闭锁等故障时,会引发送端暂态过电压。本文分别在基于电磁暂态的两区域直流系统算例和基于机电暂态仿真的大电网算例中分析比较了在直流换相失败及闭锁故障时,3种动态无功补偿装置的抑制能力。仿真结果表明,基于电磁暂态的两区域直流算例和基于机电暂态的大电网算例得到的结论基本一致,相互印证,即同步调相机具有更好的暂态过电压抑制能力。最后,通过优化调相机的直轴暂态电抗和直轴暂态时间常数等关键性能参数,能够更好地抑制直流故障导致的送端交流母线的暂态压升。The high-voltage withstand capability of renewable energy units is poor,and the transient overvoltage at the sending end caused by HVDC faults is easily transmitted to the nearby wind farms,leading to wind turbine tripping accidents.In terms of the measures of suppressing transient overvoltage by installing dynamic reactive power compensation devices at the sending end,the suppression effects of commonly used dynamic reactive power compensation devices are compared in a simple two-region system based on electro?magnetic transient simulation.The results show that the synchronous compensator has the best suppression effect on the transient overvoltage of the renewable energy HVDC delivery system.Then,the conclusion of the two-region system is verified in an actual large-scale power grid example based on the electromechanical transient simulation.Finally,the suppression effect of key performance parameters of synchronous condenser on transient overvoltage is discussed.By optimizing the d axis transient reactance and transient time constant,the transient voltage rise can be improved.

关 键 词：动态无功补偿 同步调相机 暂态过电压 换相失败 直流闭锁 

分 类 号：TM721.1[电气工程—电力系统及自动化] TM761.12