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直流输电系统换相失败预防控制改进策略
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1.重庆大学电气工程学院;2.国网河南省电力公司电力科学研究院

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国家自然科学基金,国家重点研发计划,中央高校基本科研业务费,国家电网公司技术资助项目


Improved Strategy for Preventing and Controlling Commutation Failure in HVDC Transmission System
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    摘要:

    基于电网换相换流器的高压直流输电(LCC-HVDC)在交流电网故障下易发生换相失败,对电力系统的安全稳定运行造成很大影响。基于交流电压跌落快速检测的换相失败预防控制(CFPREV)是避免首次换相失败的主要手段。换相失败与电压跌落、故障时刻及直流电流和触发角等因素的变化有关,而常规CFPREV基于固定控制参数易出现误动的情况,使得电网运行状况进一步恶化。为此,本文综合考虑短路故障发生时刻、直流电流动态变化和关断角控制器响应等因素对换相过程的影响,推导了交流故障引发首次换相失败的临界换相电压值;然后通过量化不同故障严重程度下换流阀对换相裕度的需求,建立了触发角调节量的选取方法;最后提出了直流输电系统CFPREV的改进策略,最大程度上提升直流系统首次换相失败免疫能力,降低直流系统发生换相失败的概率。

    Abstract:

    Line commutated converter based high voltage direct current (LCC-HVDC) is prone to commutation failure under AC grid fault, which has a great impact on the safe and stable operation of power system. Commutation Failure Prevention Control (CFPREV) based on AC voltage drop rapid detection is the main means to avoid the first commutation failure. Due to commutation failure is related to voltage sag, fault initial time, DC current and advanced angle, it is easy to cause misjudgement of CFPREV based on fixed control parameters, which further deteriorates the recovery process of power grid. In this paper, the critical commutation voltage of first commutation failure resulted by the AC grid fault is deduced considering the influence of fault initial time, dynamic change of DC current and response of extinction angle controller. Then, the selection method of advanced angle is established by quantifying the commutation margin demand of commutation valve under different fault severity. An improved strategy of CFPREV for HVDC transmission system is proposed, which can enhance the immune ability of HVDC against first commutation failure to the greatest extent and reduce the probability of HVDC commutation failure.

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引用本文

欧阳金鑫,张真,肖超.直流输电系统换相失败预防控制改进策略[J/OL].电力系统自动化,http://doi.org/10.7500/AEPS20190613007.
OUYANG Jin-Xin,zhangzhen,xiaochao.Improved Strategy for Preventing and Controlling Commutation Failure in HVDC Transmission System[J/OL].Automation of Electric Power Systems,http://doi.org/10.7500/AEPS20190613007.

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历史
  • 收稿日期:2019-06-13
  • 最后修改日期:2020-05-07
  • 录用日期:2019-09-29
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