Abstract
In order to solve the problems existing in the traditional relay protection methods, such as poor relay safety and large fault location error of distribution network, this paper proposes a multilevel differential relay protection method based on feeder segment switch. The configuration principle and the selection principle of multilevel range are determined, and the objective function of multilevel difference distribution network feeder segment switch configuration is set. After considering the target of economic benefit, the main feeder of distribution network is segmented and a contact switch is set at the end of the feeder. The equivalent topology of multilevel differential distribution network is analyzed to make the power supply at the first end of the line connected with the substation, which is regarded as the ideal voltage source. Considering the jurisdiction index of the switch, greedy algorithm is adopted to optimize the switch configuration of feeder segment. This paper analyzes the protection misoperation of multilevel differential distribution network and the sensitivity of feeder segment switch to realize the relay protection of multilevel differential distribution network. The experimental results show that the proposed method has higher safety and lower fault location accuracy, and is feasible to some extent.
Research on Relay Protection of Distribution Network with DG
