考虑继电保护动作的分布式电源在配电网中的准入容量研究  

Penetration Level Permission of for DG in Distributed Network Considering Relay Protection

作　　者：王江海[1] 邰能灵[1] 宋凯[1] 顾临峰[2] 盛继卿 

机构地区：[1]上海交通大学电子信息与电气工程学院,上海市闵行区200240 [2]上海市电力公司,上海市浦东区200122 [3]上海中区节电科技有限公司,上海市黄浦区200071

出　　处：《中国电机工程学报》2010年第22期37-43,共7页Proceedings of the CSEE

基　　金：新世纪优秀人才支持计划项目(NCET-08-0356)~~

摘　　要：分布式电源(distributed generator,DG)接入系统会引起保护检测电流的变化,从而影响继电保护的保护范围。讨论在满足继电保护可靠动作的前提下,配电网(distribution network,DN)允许接入的分布式电源的最大功率(容量),提出一种考虑配电网保护动作和分布式电源短路电流衰减特性影响的DG准入容量的分析方法,并讨论了单个电源和多个电源接入配电网时的接入点、接入方式及线路参数等对准入容量的影响。分析表明,不改变配电网的原有保护配置的情况下,DG准入容量很小。对此,提出一种仅少量改动配电网保护就能有效提高DG准入容量的方法。最后,对一个10kV配电系统进行了分析计算,验证了提高DG准入容量方法的有效性。The distributed generators （DG）, connecting with the power system through the distribution network （DN）, can cause the change of the detected current for protection relay and the protection coverage. The maximum allowable capacity of the distributed generators in the DN was analyzed for meeting the requirements of relay protection and limiting the impact to short-circuit current characteristics. The influence factors of the maximum allowable capacity including the connection location, the composition of multiple DG and the line parameters in the DN were also analyzed. Analysis results show that the accessing capacity of DG is small if the original DN protection configuration is not improved. To solve this problem, some measurements, with only a small number of changes to the original DN protection, were proposed to effectively improve the penetration level. Finally, the effectiveness of the measure was verified by analyzing a 10 kV distribution system.

关 键 词：分布式电源 准入容量 配电网保护 接入点 接入方式 

分 类 号：TM71[电气工程—电力系统及自动化]