配电网中分布式发电机容量计算  

Distributed generator capacity calculation in distribution network

作　　者：李燕平 敖健永 黎带珍 叶建东 LI Yan-ping;AO Jian-yong;LI Dai-zhen;YE Jian-dong(Yangjiang Power Supply Bureau,China Southern Power Grid Co.Ltd.,Yangjiang 529500,China)

机构地区：[1]中国南方电网有限公司阳江供电局,广东阳江529500

出　　处：《沈阳工业大学学报》2022年第6期620-624,共5页Journal of Shenyang University of Technology

基　　金：国家自然科学基金青年科学基金项目(61863113).

摘　　要：针对分布式发电机(DG)与配电网络连接时注入的DG数量、位置和大小会对配电网络性能与保护系统的协调性产生影响的问题,提出了一种反馈法来确定配电网络每个节点上DG的容量,使其免于发生协调错误.确定节点发生相间故障时位于总线上DG的容量,并记录流经继电器的故障电流,计算出主/副继电器的动作时间;重复调节DG容量直到主/备用继电器的动作时间差小于协调时间间隔,并选择该值作为总线上DG的最小容量.仿真结果显示,所提出的方法可以准确计算出不同模式下网络中能够保持中继协调时DG的容量.Aiming at the problem that the number,location and size of distributed generators(DG)will affect the distribution network performance and the coordination of protection system when DG is connected and injected to distribution network,a feedback method was proposed to determine the capacity of DG at each node of the distribution network and avoid coordination errors.The capacity of DG on the bus in the case of inter phase no default was determined,the fault current flowing through relay was recorded,and the action time of main/auxiliary relays was calculated.The DG capacity was repeatedly adjusted until the action time difference between main and standby relays was less than the coordination time interval,and this value was finally selected as the minimum capacity of DG on the bus.The simulation results show that the as-proposed method can calculate the capacity of DG when relay coordination can be maintained in different modes.

关 键 词：分布式发电机 发电机容量 中继设置 配电网 保护设备协调 DG能力 最大容量 最小容量 

分 类 号：TM771[电气工程—电力系统及自动化]