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基于级联全桥型直流断路器的直流配电网自适应重合闸方案
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新能源电力系统国家重点实验室华北电力大学

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Adaptive Reclosing Scheme Based on Cascaded Full-bridge DC Circuit Breaker For DC Distribution Network
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State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University

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    摘要:

    柔性直流配电网是配电系统的重要发展方向,可以采用电缆和架空线两种方式组网。鉴于架空线路瞬时性故障多发的特点,基于架空线的柔性直流配电网应配备有效的自适应重合闸方案,以提高供电可靠性。为实现这一目标,本文从断路器线路端电压与电流的相位差异特征出发,提出一种基于级联全桥型直流断路器控制的自适应重合闸方案。首先通过断路器转移支路的主动控制产生一定频率的故障检测电压,进而根据断路器线路端电压电流在对应频率下相位特征的差异,区分瞬时性和永久性故障,并进一步分析了过渡电阻等因素的影响。最后,利用PSCAD/EMTDC仿真平台搭建了柔性直流配电网模型,验证了所提自适应重合闸方案的可行性和有效性。

    Abstract:

    Flexible DC distribution network is an important area of the development of power distribution system, which can be built by overhead lines or cables. Considering the fault occurred on overhead lines is mostly temporary, it is necessary for DC distribution networks based on overhead lines to adopt effective reclosing scheme to improve power reliability. In order to realize this purpose, this paper utilizes the different phase characteristics between line terminal voltage and current, and further purposes an adaptive reclosing scheme based on cascaded full-bridge DC circuit breaker, Firstly, generate fault detection voltage at a given frequency by control of the transmission branch of DCCB. Then, distinguish temporary or permanent fault according to the different phase characteristics of DCCB line terminal voltage and current at this frequency. Besides, the influence of some factors like transitional resistance is analyzed. Finally, a model of DC distribution network is built up on PSCAD/EMTDC to verify the feasibility and effectiveness of this adaptive reclosing scheme.

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郑 涛,吕文轩.基于级联全桥型直流断路器的直流配电网自适应重合闸方案[J/OL].电力系统自动化,http://doi.org/10.7500/AEPS20200115010.
ZHENG Tao,LYU Wenxuan.Adaptive Reclosing Scheme Based on Cascaded Full-bridge DC Circuit Breaker For DC Distribution Network[J/OL].Automation of Electric Power Systems,http://doi.org/10.7500/AEPS20200115010.

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  • 收稿日期:2020-01-15
  • 最后修改日期:2020-05-14
  • 录用日期:2020-04-14
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