低压微网接地技术  

Earthing schemes in low-voltage microgrid

作　　者：李博通[1] 李斌[1] 李永丽[1] 姚创[1] 

机构地区：[1]天津大学智能电网教育部重点实验室,天津300072

出　　处：《电力自动化设备》2013年第3期53-59,共7页Electric Power Automation Equipment

基　　金：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)~~

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。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 researched.

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 

分 类 号：TM726.2[电气工程—电力系统及自动化] TM863