基于5G通信模式下的配电网自愈保护应用

因配电网线路分段、分支开关数量多,导致配电网保护级差配合困难,故障切除模糊,故障范围扩大。应用配电自动化系统,可解决这一问题并完成配电网自愈。目前,配电自动化多采用主站集中式,即收集各节点电气量和开关量信息上送至主站,主站完成逻辑判断,进行策略下发,实现故障隔离和电网自愈。但主站式方式数据传输、校验环节多,故障隔离时间通常在分钟级,在配电网络自愈时,需短时对主供线路停电。采用基于5G通信技术的分布式馈线自动化,通过下沉计算及逻辑判别节点至配电终端,实现了毫秒级的故障就地隔离及网络重构,故障切除精准。探索的配网保护定值优化方案,通过配网保护定值与分布式馈线自动化故障判别策略的融合配合,实现了主供线路不停电情况下的故障隔离和配电网重构,做到了用户停电“零感知”。工程在成都市配电网首次实施应用,取得了良好效果,有效解决了城区保护级差配合困难的问题,为5G通信保护在配电网及其他电压等级电网上的拓展应用积累了经验。

Application of distribution network protection based on a 5G end-to-end communication mode

Because of the large number of line sections and branch switches in a distribution network, it is difficult to coordinate the protection level difference of the network, and fault removal is fuzzy, and the fault range is expanded. The application of a distribution automation system can solve this problem and complete the self-healing of the network. At present, distribution automation is mainly centralized by the master station, that is, the information on electrical and switching quantity of each node is collected and sent to the master station. The master station completes logic judgment and issues strategies to realize fault isolation and power grid self-healing. There are many data transmission and verification links in the master station mode, and the fault isolation time is usually at the minute level. When the distribution network is self-healing, the main power supply line needs to be powered off for a short time. In this paper, distributed feeder automation based on 5G communication technology is adopted, and millisecond level fault local isolation and network reconstruction are realized through sinking calculation and logical discrimination between nodes and distribution terminals, with accurate fault removal. The explored optimization scheme of distribution network protection setting realizes fault isolation and distribution network reconstruction when the main power supply line is not powered off, and achieves the "zero perception" of power failure by users through the integration of distribution network protection setting and distributed feeder automation fault discrimination strategy. The project has been implemented and applied in the Chengdu urban distribution network for the first time, achieving good results, effectively solving the problem of difficult coordination of protection level difference in urban areas, and accumulating experience for the expansion and application of 5G communication protection in distribution networks and other voltage level power grids. This work is supported by the National Natural Science Foundation of China (No. 52190421018Q).