Suzhou Electric Appliance Research Institute
期刊號: 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研究

來源:電工電氣發(fā)布時間: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研究

李星星,粟時平,龍坤,黃俊瑋,劉毅博,李洋濱
(長沙理工大學(xué) 電氣與信息工程學(xué)院,湖南 長沙 410114)
 
    摘 要:直流微電網(wǎng)中所配置的線路保護需要兼顧速動性與選擇性,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)線路保護方案。通過分析直流微電網(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,使得保護裝置通過基于單端測量獲取的電流信號量實現(xiàn)故障檢測,同時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影響供電。針對典型的極地故障,通過仿真的形式驗證了所提保護方案的可行性。
    關(guān)鍵詞: 直流微電網(wǎng);不平衡保護;雙回路供電;極地故障
    中圖分類號:TM711     文獻標識碼:A     文章編號: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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