文章摘要
抑制直流连续换相失败的直流电流指令值优化策略
Optimization strategy of DC current order value to restrain DC continuous commutation failure
投稿时间:2019-11-12  修订日期:2020-01-10
DOI:
中文关键词: 换相失败  连续换相失败  直流电流指令值  高压直流输电
英文关键词: commutation failure  continuous commutation failure  DC current order value  HVDC
基金项目:国家自然科学(51877185);国网新疆电力有限公司昌吉供电公司科技项目(SGXJCJ00FCS1900297)
作者单位E-mail
王勇 国网新疆电力有限公司 昌吉供电公司 1055823727@qq.com 
尹纯亚 新疆大学电气工程学院 1399132297@qq.com 
石岩 国网新疆电力有限公司 昌吉供电公司  
张志宇 国网新疆电力有限公司 昌吉供电公司  
王英 国网新疆电力有限公司 昌吉供电公司  
王娟 国网新疆电力有限公司 昌吉供电公司  
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中文摘要:
      为抑制直流系统连续换相失败,通过分析换相失败机理,得出直流电流上升与逆变侧交流系统电压降低是影响首次换相失败的主要原因。研究直流首次换相失败后恢复阶段时的控制系统动作特性与电气量变化规律,得出在换相失败恢复期间,逆变侧直流电压的快速恢复会引起直流电流指令值的快速上升,逆变侧切换为定电流控制,由于在控制过程中未考虑直流电流上升对关断角的影响,会导致控制系统失去关断角的控制权从而引起直流连续换相失败。基于此,提出一种考虑关断角的直流电流指令值优化控制策略,结合低压限流控制抑制连续换相失败的发生。最后,基于PSCAD/EMTDC仿真软件与CIGRE HVDC模型仿真验证了所提控制策略的有效性。
英文摘要:
      In order to suppress the continuous commutation failure of DC system, the main reason of the first commutation failure is the rise of DC current and the decrease of AC system voltage at the inverter side. In the recovery phase after the first commutation failure of DC, the action characteristics of the control system and the law of electrical quantity change are studied. It is concluded that during the recovery phase of commutation failure, the main reason for the failure of DC continuous commutation is that the control strategy of the inverter side is switched to constant current control and the control right of the turn off angle is lost. Based on this, an optimal control strategy of DC current command value considering the turn off angle is proposed, which combines with low-voltage current limiting control to suppress the occurrence of continuous commutation failure. Finally, the effectiveness of the proposed control strategy is verified by PSCAD / EMTDC simulation software and CIGRE HVDC model simulation.
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