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基于虚拟电流网络的换流器最后断路器保护
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中国南方电网有限责任公司超高压输电公司检修试验中心,广东省广州市 510633

作者简介:

武霁阳(1987—),男,通信作者,博士,工程师,主要研究方向:直流输电系统控制与保护。E-mail:wujy0451@163.com
何竞松(1987—),男,硕士,工程师,主要研究方向:直流输电系统控制与保护。
彭光强(1987—),男,硕士,工程师,主要研究方向:直流输电系统控制与保护。

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Last Breaker Protection of Converter Based on Virtual Current Network
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Maintenance and Test Center of CSG EHV Power Transmission Company of

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    摘要:

    目前,换流器最后断路器保护存在可靠性差、逻辑复杂或预警性不足等问题,实际工程也出现了换流器最后断路器保护误出口事件。为此,文中首先梳理了实际工程换流器最后断路器保护的实现策略,并在换流器最后断路器电流回路特征分析的基础上,构造了虚拟交流出线电流网络和虚拟母线电流网络,继而提出了一种基于虚拟电流网络的换流器最后断路器保护算法,从原理上解决了最后断路器识别问题。所提算法与实际工程应用的算法进行了对比测试,测试结果表明所提算法可正确地识别最后断路器,原理清晰可靠,且有效地避免了实际工程中算法逻辑复杂、需要遍历等问题。

    Abstract:

    At present, the last breaker protection for converter has the problems of poor reliability, complex logic or insufficient early warning, and there is an undesired tripping event of the last breaker protection for converter in practical project. Therefore, the realization strategy of last breaker protection in practical project is firstly sorted out. Based on the analysis of current loop characteristics of last breakers for converter in the paper, the current network of virtual AC line and virtual bus are constructed. Then, an algorithm of last breaker protection for converter is proposed based on the virtual current networks, which can solve the problem of identifying the last breaker for converter in principle. The proposed algorithm is compared with the algorithm used in practical engineering application, and the results demonstrate that the proposed algorithm can correctly identify the last breakers with clear and reliable principle, and avoid the problems of complex logic and the demand of traversing all working conditions.

    图1 含有3串联络线的3/2接线电路Fig.1 3/2 wiring with three interconnection lines
    图2 虚拟交流出线电流网络Fig.2 Network of virtual AC line current
    图3 虚拟母线电流网络Fig.3 Network of virtual bus current
    图4 虚拟交流出线电流网络等效电路Fig.4 Equivalent circuit of virtual AC line current network
    图5 虚拟母线电流网络等效电路Fig.5 Equivalent circuit of virtual bus current network
    图6 某7串联络线、6条交流出线的3/2接线电路Fig.6 3/2 wiring with 7 interconnection lines
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引用本文

武霁阳,何竞松,彭光强,等.基于虚拟电流网络的换流器最后断路器保护[J].电力系统自动化,2020,44(1):168-174. DOI:10.7500/AEPS20190301003.
WU Jiyang,HE Jingsong,PENG Guangqiang,et al.Last Breaker Protection of Converter Based on Virtual Current Network[J].Automation of Electric Power Systems,2020,44(1):168-174. DOI:10.7500/AEPS20190301003.

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  • 收稿日期:2019-03-01
  • 最后修改日期:2019-06-11
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  • 在线发布日期: 2020-01-04
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