柔性中压直流配电网的新型电流差动保护方案
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TM773

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中央高校基本科研业务费


A novel current differential protection scheme for flexible medium voltage dc distribution network
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Basic scientific research operating expenses of central universities

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    摘要:

    柔性中压直流配电网具有运行方式灵活、潮流控制安全简单、经济性好等特点,是未来构建直流电网的重要组成部分。但是中压直流配电网短路电流上升快且无自然过零点,换流站中的IGBT等元件耐过流能力极差,因此需要继电保护方案能够迅速可靠动作。而由于中压直流配电网多使用电缆作为传输线,而电缆线路的结构以及所处环境都对电流差动保护的性能产生极大影响。为解决含电缆线路的柔性中压直流配电网电流差动保护性能不佳的问题,本文采用一种基于贝瑞隆模型的新型差动保护方案,通过实例仿真分析,验证了其相比于常规电流差动保护,可明显提高电流差动保护的速动性。

    Abstract:

    The flexible medium-voltage dc distribution network has the characteristics of flexible operation mode, safe and simple power flow control and good economy, etc. It is an important part of the future construction of dc power network. However, the short-circuit current of the medium-voltage dc distribution network rises rapidly without natural zero crossing, and the over-current resistance of IGBT and other components in the converter station is extremely poor, so the relay protection scheme is required to be able to act quickly and reliably. As the medium voltage dc distribution network mostly uses cables as transmission lines, the structure and environment of the cable lines have great influence on the performance of current differential protection. In order to solve the problem of poor performance of current differential protection in flexible medium-voltage dc distribution network with cable lines, a new type of current differential protection scheme based on Bergeron model is adopted, and compared with conventional current differential protection, the quick action of current differential protection is obviously improved.

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引用本文

刘静,吕睿. 柔性中压直流配电网的新型电流差动保护方案[J]. 科学技术与工程, 2021, 21(7): 2720-2724.
Liu Jing, Lü Rui. A novel current differential protection scheme for flexible medium voltage dc distribution network[J]. Science Technology and Engineering,2021,21(7):2720-2724.

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  • 收稿日期:2020-05-26
  • 最后修改日期:2020-12-17
  • 录用日期:2020-09-16
  • 在线发布日期: 2021-03-31
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