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文章摘要
高压直流输电系统抑制连续换相失败的策略研究
Research the strategy of mitigate consecutive commutation failure for HVDC transmission system
Received:October 20, 2019  Revised:October 31, 2019
DOI:10.19753/j.issn1001-1390.2020.04.027
中文关键词: 高压直流输电  连续换相失败  低压限流  CIGRE标准模型  故障恢复
英文关键词: HVDC, continuous  commutation failure, VDCOL, CIGRE  model, fault  recovery
基金项目:国家自然科学基金(51567005)
Author NameAffiliationE-mail
Zhao Xiaolong School of Electrical Engineering,Guizhou University 511876354@qq.com 
Chen Zhuo* School of Electrical Engineering,Guizhou University 37495589@qq.com 
Tian Xiao School of Electrical Engineering,Guizhou University 547647272@qq.com 
He Qinglong School of Electrical Engineering,Guizhou University 1170427908@qq.com 
Zhang Yegui School of Electrical Engineering,Guizhou University 1015702823@qq.com 
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中文摘要:
      对于直流馈入受端电网,换相失败是一种最常见的故障。为减少输电系统发生连续换相失败的概率,对换相机理和控制环节的运行逻辑进行分析,然后结合低压限流控制器的特点,提出了一种可以抑制连续换相失败的策略。通过预测模块提前减小逆变触发角,增大换相裕度,同时在整流侧补偿触发角,抑制直流电流上升,并且利用交流母线电压波动小的特点,代替低压限流装置的启动电压。基于PSCAD/EMTDC平台,使用CIGRE标准模型测试所提出的方法。通过仿真实验可知,所用的控制策略在逆变侧发生交流系统短路故障时,能有效抑制系统的连续换相失败,并且会改善故障恢复特性。
英文摘要:
      Commutation failure is one of the most common faults for high voltage direct current (HVDC) receiving end power grid. In order to reduce the probability of continuous commutation failure in HVDC power transmission system, the mechanism of commutation failure and the action logic of HVDC system control link was analyzed. Then, based on VDCOL (voltage dependent current order limiter) control which was widely used in HVDC, a novel control method was proposed. Predictive module will reduce the inverter trigger angle and increase commutation margin in advance, at the same time, the rectifying side will compensate for the trigger angle for restrain DC current rise. And then, substitute AC bus voltage for the starting voltage of VDCOL. Based on the CIGRE benchmark model of HVDC, the proposed method was tested in PSCAD/EMTDC. The simulation results show that, the proposed method can suppress continuous failure during short circuit fault, improve the fault recovery performance effectively, and ensure the normal operation of HVDC transmission system.
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