| 引用本文: | 刘畅,李程昊,姚伟,张振安,文劲宇.基于整流侧触发角紧急控制的换相失败预防策略[J].电力自动化设备,2019,39(1): |
| LIU Chang,LI Chenghao,YAO Wei,ZHANG Zhen'an,WEN Jinyu.Rectifier trigger angle emergency control strategy for preventing commutation failures[J].Electric Power Automation Equipment,2019,39(1): |
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| 摘要: |
| 分析换相失败的机理，指出现有换相失败预防控制措施的局限性，提出一种基于整流侧触发角紧急控制的换相失败预防策略。该控制策略根据交流系统故障严重程度及系统的恢复情况确定整流侧触发角参考值，采用可变启动阈值调整控制系统检测交流故障的灵敏度；采用可变输出惯性时间常数确定控制器输出量的变化速度，从而达到既预防换相失败又兼顾交直流系统恢复速度的目的。以改进的CIGRE HVDC模型为例进行了仿真研究，仿真结果表明所提方法的优越性，并验证了可变启动阈值及可变输出惯性时间常数设计的合理性。此外，分析并仿真说明了整流侧到逆变侧的站间通信时延对控制系统作用效果的影响。 |
| 关键词: 换相失败 高压直流输电 触发角紧急控制 换相失败预测控制 预防控制 |
| DOI：10.16081/j.issn.1006-6047.2019.01.002 |
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| Rectifier trigger angle emergency control strategy for preventing commutation failures |
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LIU Chang1,2, LI Chenghao3, YAO Wei1, ZHANG Zhen'an3, WEN Jinyu1
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1.State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;2.Electric Power Research Institute of State Grid Sichuan Electric Power Company, Chengdu 610041, China;3.Electric Power Research Institute of State Grid Henan Electric Power Company, Zhengzhou 450052, China
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| Abstract: |
| The mechanism of commutation failures is analyzed, and the limitation of the existing commutation failure mitigation methods is pointed out. A novel RTAEC(Rectifier Trigger Angle Emergency Control) strategy is thus proposed. By applying this strategy, the trigger angle reference in the rectifier side can be determined according to the severity of AC faults and the stage of system recovery, the sensitivity of AC faults detection of control system is adjusted according to the variable start-up threshold, and the changing rate of the output is controlled according to the changeable output inertia time constant. Thus, the prevention of commutation failures and the restoring speed of AC/DC system are both taken into consideration. Taking a modified CIGRE HVDC model as the simulation example, the results verify the superiority of the proposed approach and the rationality of the design of variable start-up threshold and changeable output inertia time constant. Furthermore, the effect of the communication delay between stations at the rectifier-side and the inverter-side on the control system is also analyzed and simulated. |
| Key words: commutation failure HVDC power transmission trigger angle emergency control commutation failure prevention preventing control |
