接入分布式电源的配电网双整定值方向过电流保护方法

Dual Setting Value Direction Overcurrent Protection Method for Distribution Network Connected to Distributed Generation

分布式电源在配电网中的普及率越来越高,由于多台分布式电源的接入,传统的方向过流保护可能无法满足需求。提出了一种无需通信辅助的双整定值方向过流保护方法。以确定最优的继电保护正反向整定值和最小化继电保护的总动作时间为目标,将保护方法描述为非线性规划问题,并建立算法进行求解。将所提出的的保护方法应用于33节点具有分布式电源的放射状配电网,并与传统的依赖标准过流继电器和方向过流继电器的保护方法进行了性能比较。结果表明,对于放射状配电网,该方法能够减轻分布式电源反向故障电流引起的保护配合失效问题,且不需要辅助通信,也不需要额外的继电器,具有较高的保护性能。

The popularity of distributed generation in distribution network is getting higher and higher.Due to the connection of multiple distributed generation,the traditional directional overcurrent protection may not be able to meet the demand.A dual setting directional overcurrent protection method without communication assistance is proposed.With the goal of determining the optimal forward and re-verse setting values of relay protection and minimizing the total action time of relay protection,the protection method is described as a nonlinear programming problem,and an algorithm is established to solve it.The proposed protection method is applied to the 33-bus ra-dial distribution network with distributed generation,and the performance is compared with the traditional protection method which relies on standard over-current relay and directional over-current relay.The results show that for the radial distribution network,the protection coordination failure caused by the reverse fault current of the distributed power supply can be reduced by using the proposed method,and auxiliary communication and additional relays are not needed,indicating that the proposed method has high protection performance.