辐射状配电网电流保护范围在线分析方法

Online analysis method of current protection range for radial distribution system

随着城市配电网的环网率逐步提高,配电网运行方式更加灵活,负荷转供后需要对各馈线的电流保护定值进行实时分析,计算馈线中任意一条支路故障后馈线根节点处的故障电流。由于配电网规模庞大,重复进行故障电流的计算需要大量时间,为减少计算时间,在考虑辐射状网络拓扑特点的基础上,提出一种快速网络等值参数计算方法,通过一次计算可以得到故障电流计算所需的网络等值参数。算例分析表明:该方法计算时间大为缩短,计算效率大大提高,可满足配网自动化在线应用的需求。

With the development of distribution network, the operation mode is more and more flexible. After the operation mode changing, it is necessary to analyze the current protection setting value of each feeder in real time and calculate the fault current at the root of feeder after fault. It spends more time to repeat calculate the fault current of each feeder, thus, a fast calculation method of network equivalent parameters based on the characteristic of radial network topology was proposed in this paper. The network equivalent for all fault current calculations could be obtained. The simulation results show that the calculation time is greatly reduced by using the proposed method, and the computational efficiency is improved, which is satisfied the needs of distribution automation online application.