| 引用本文: | 李博通,李 斌,李永丽,姚 创.低压微网接地技术[J].电力自动化设备,2013,33(3): |
| LI Botong,LI Bin,LI Yongli,YAO Chuang.Earthing schemes in low-voltage microgrid[J].Electric Power Automation Equipment,2013,33(3): |
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| 摘要: |
| 以保证人身安全及设备稳定运行为目标，对低压微网的接地方式进行深入研究和探讨。针对低压微网的系统接地，分析分布式电源的中性线接入的必要性；考虑杂散电流的危害，提出低压微网中同一建筑内的电源中性点接地唯一性的要求；根据低压微网的不同运行方式，制定确保系统内中性点可靠接地的原则。针对低压微网的保护接地，分析传统低压配电网的TN和TT接地方式中保护接地在低压微网中的适用性；针对低压微网中分布式电源和用电设备的特点，提出混合接地方式并对其辅助设备配置方案进行研究。 |
| 关键词: 系统接地 保护接地 低压微网 杂散电流 剩余电流保护器 |
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| 基金项目:国家重点基础研究发展计划（973计划）资助项目（2009CB219704）；国家自然科学基金资助项目（50977061）；天津市自然科学基金资助项目（11JCYBJC07600）；高等学校博士学科点专项科研基金新教师类项目（20120032120085） |
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| Earthing schemes in low-voltage microgrid |
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LI Botong, LI Bin, LI Yongli, YAO Chuang
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Key Laboratory of Smart Grid of Ministry of Education，Tianjin University，Tianjin 300072，China
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| Abstract: |
| With the personal safety and reliable operation as the targets，the earthing schemes of low-voltage mircrogrid are studied. As to the system earthing of low-voltage mircrogrid，the necessity of including the neutral line of DG is analyzed；it is suggested to set the unique earthing spot for the neutral points of all power supplies in one building to avoid the harm of stray current；the rules for reliable earthing of neutral points in a system should be established according to different operating modes. As to the protection earthing，the applicability of TN and TT earthing modes used in traditional low-voltage distribution network to low-voltage microgrid is analyzed；with the consideration of distributed power generators and appliances in low-voltage mircrogrid，a mixed earthing scheme is proposed and the configuration scheme of its auxiliary equipment is researched. |
| Key words: system earthing protection earthing low-voltage microgrid stray current RCD |
