电流偏差控制对换相失败及其恢复过程的影响分析
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TM732

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国家自然科学基金资助项目(51877185)


Influence of current error controller on commutation failures and system recovery
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Project supported by National Natural Science Foundation of China(NSFC)(51877185).

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    摘要:

    预测型定关断角控制是高压直流工程逆变器常规的控制方式之一,其中,电流偏差环节的比例系数会对系统换相失败抑制能力及系统恢复产生影响。为明确电流偏差环节产生影响的机理并提出应对措施,文中首先基于高压直流基本控制策略,分析了电流偏差环节的小干扰下功能;其次,对故障初期和故障恢复阶段电流偏差控制中比例系数的影响机理展开研究,发现常规电流偏差控制比例系数设置为正会导致换相失败抑制能力下降,但对系统恢复有利;然后,提出一种自适应电流偏差控制,通过多种检测模块快速判别系统状态并输出合适的比例系数,以达到兼顾系统换相失败抑制能力及系统恢复的效果;最后,基于PSCAD/EMTDC搭建了高压直流输电系统模型,并通过仿真测试验证了理论分析的正确性及所提出应对措施的有效性。

    Abstract:

    Constant extinction angle control based on prediction is a basic control strategy of inverter in line-commutated converter high-voltage direct current (HVDC) system. However,system commutation failure suppression ability and system recovery are determined by the proportionality coefficient in the current error control. To clarify the influence mechanism and propose countermeasures,the function of current error controller is analyzed based on the basic control strategy. Then the influence mechanism of proportional coefficient in current error controller is studied at both the initial stage of fault and fault recovery stage. It can be concluded that the mitigation effect of commutation failure would perform worse if the proportion coefficient of current error control is set to positive. Nevertheless,the recovery performance of the HVDC system would be better. Based on this a novel adaptive current error control is proposed,which can quickly identify the system state through detection modules and output an appropriate proportional coefficient to take into account the commutation failure suppression ability and recovery process of the system. Finally,high-voltage direct current test model is built based on PSCAD/EMTDC,and the correctness of the theoretical analysis and the effectiveness of the proposed countermeasures are verified by simulation test.

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宋新甫,陈伟伟,周博昊,李凤婷,许叶林,任娟.电流偏差控制对换相失败及其恢复过程的影响分析[J].电力工程技术,2022,41(2):37-44

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历史
  • 收稿日期:2021-11-03
  • 最后修改日期:2022-01-12
  • 录用日期:2021-09-28
  • 在线发布日期: 2022-03-24
  • 出版日期: 2022-03-28