摘要
微电网从并网运行过渡到孤岛运行后,由于系统容量下降,线路发生短路时故障电流将会减小,若仍然采用原先的电流保护整定值必然会造成保护灵敏度的下降,甚至引起保护的拒动。针对这个问题。提出了一种自适应电流保护整定策略:根据孤岛系统中各分布式电源状态变化,采用基于网络拓扑结构的在线整定方法对各线路的电流保护定值进行实时计算,然后将新的保护定值发送至各线路的保护装置,最终达到各保护定值能跟随系统状态的变化而变化的目的。通过PSCAD/EMTDC软件平台仿真验证了该保护整定策略的可行性。
After micro-grid being transformed from grid-connected to the island, the system capacity will decline and the fault current will reduce when the short circuit fault occurs. If the traditional current protection setting schemes are used, the relay protection sensitivities will decline and tripping failure will occur. To solve this problem, the paper proposes a strategy of adaptive current protection. According to the status of each distributed generation in the island, the paper uses online setting method based on the topological structure of network to calculate the protection setting values, and sends the values to the protective device to make each value follow the changing of the system state. PSCAD/EMTDC-based software Simulation results verified the feasibility of this proposed method.
出处
《陕西电力》
2014年第9期68-72,共5页
Shanxi Electric Power
关键词
孤岛
自适应
整定
网络拓扑
跟随
island
self-adaption
setting
topological structure
following
