摘要
提出大量的分布式发电的并网运行,必将对现有的配电网的结构、故障时配电网中短路电流的大小、方向产生深刻的影响,从而影响配电网的可靠性和安全性。以10 kV馈线的保护为例,探讨了分布式发电对单侧电源、辐射型网络中基于断路器的三段式电流保护、熔断器保护以及自动重合闸的影响。并针对今后大量DG接入配电网的情况提出若不改变电网的结构,保持配电网保护设备的协调性的最佳的方案就是把整个配电网分区,按选择性要求切除故障区域的分布式电源,实现故障线路的隔离。
The paper includes that the increasing amount of distributed generation （DG） in power system will deeply affect the network structure, the direction and amperage of short-current in the system, and will affect the reliability and stability of the net. Taking the 10kV network as an example, the paper explores the effect of DG on protective device such as 3-sectional current protection based on circuit breakers, fuse-fuse coordination and reclosure. It concludes that if protection scheme is not changed, the best way to maintain coordination in presence of arbitrary DG penetration is to divide the network into several zones, then disconnect the right DG selectively and instantaneously in case of fault.
出处
《继电器》
CSCD
北大核心
2008年第1期12-14,26,共4页
Relay
关键词
分布式发电
三段式电流保护
熔断器
重合闸
保护设备协调性
distributed generation
3-sectional current protection
fuse
reclosure
coordination of protective device
