Suzhou Electric Appliance Research Institute
期刊號(hào): CN32-1800/TM| ISSN1007-3175

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用于直流微電網(wǎng)線路的新型不平衡保護(hù)研究

來(lái)源:電工電氣發(fā)布時(shí)間:2024-06-03 14:03 瀏覽次數(shù):119

用于直流微電網(wǎng)線路的新型不平衡保護(hù)研究

李星星,粟時(shí)平,龍坤,黃俊瑋,劉毅博,李洋濱
(長(zhǎng)沙理工大學(xué) 電氣與信息工程學(xué)院,湖南 長(zhǎng)沙 410114)
 
    摘 要:直流微電網(wǎng)中所配置的線路保護(hù)需要兼顧速動(dòng)性與選擇性,為解決這一難題,提出了一種基于雙回供電線路的直流微電網(wǎng)線路保護(hù)方案。通過(guò)分析直流微電網(wǎng)雙回路供電下的線路故障特征,發(fā)現(xiàn)雙回路的供電形式能提供故障狀態(tài)下的不平衡信息,使得保護(hù)裝置通過(guò)基于單端測(cè)量獲取的電流信號(hào)量實(shí)現(xiàn)故障檢測(cè),同時(shí)雙回路的供電方式采用本方案能清除線路的故障部分而不會(huì)影響供電。針對(duì)典型的極地故障,通過(guò)仿真的形式驗(yàn)證了所提保護(hù)方案的可行性。
    關(guān)鍵詞: 直流微電網(wǎng);不平衡保護(hù);雙回路供電;極地故障
    中圖分類號(hào):TM711     文獻(xiàn)標(biāo)識(shí)碼:A     文章編號(hào):1007-3175(2024)05-0019-06
 
Research on Novel Imbalance Protection for DC Microgrid Lines
 
LI Xing-xing, SU Shi-ping, LONG Kun, HUANG Jun-wei, LIU Yi-bo, LI Yang-bin
(School of Electrical and Information Engineering, Changsha University of Science and Technology, Changsha 410114, China)
 
    Abstract: The line protection in DC microgrid needs to be both quick and selective. To solve this problem, a line protection scheme of DC microgrid based on double-circuit power supply line is proposed. In this paper, by analyzing the fault characteristics of the line under the double-circuit power supply of the DC microgrid, it is found that the power supply form of the double-circuit can provide imbalanced information under the fault state, so that the protection device can realize fault detection through the semaphore of current obtained based on the single-end measurement. Meanwhile, the power supply mode of the double-circuit can clear the fault part of the line without affecting the power supply. For typical polar faults, this paper verifies the feasibility of the proposed protection scheme through simulation.
    Key words: DC microgrid; imbalance protection; double circuit power supply; polar fault
 
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