IOP Conference Series: Earth and Environmental Science | 2021
Local feeder automation under mode of customer power supply priority
Abstract
The local feeder automation method (LFA) is applied in the single side power distribution system. The protection and re-closing of substation outgoing line are used to coordinate with the time limit characteristics of voltage-time type switch to isolate fault and recover power supply automatically. The access of small hydro-power (SH) makes the distribution system present multi power pattern. In this paper, based on LFA considering SH access, in order to achieve the goal that SH can operate in isolated network with load after fault, LFA under the mode of customer power supply priority (LFAUP) with adaptive opening time for switch is proposed. When the fault point is located on the grid side of the quasi power balance switch (QPBS) and the isolated network is on its load side, the switch can automatically isolate all types of short circuit fault from the load side without residual voltage locking (also known as X locking). When the power of the isolated network is balanced, the loads in which will not get power failure. Simulation results show LFAUP advanced in the paper is correct and feasible.