基于辅助继电器的环状有源配电网快速保护方法

Fast Protection Method for Loop-Based Active Power Distribution Based on Auxiliary Relay

随着分布式能源发电在有源配电网中的渗透率逐渐提高,系统对于配电网的快速协调保护的要求也逐步提升。为了可以实现安全、高效、可靠的配电网过流保护,提出了一种基于辅助方向过流继电器的协同保护方法以实现环状配电网中的快速保护。首先,详细地分析了方向过流继电器被分割在环状有源配电网的不同链路中是阻碍快速响应保护的主要原因。然后,提出通过在每个链路中增加辅助继电器可以有效地放宽系统保护的严苛约束,提高保护效率,同时大幅降低继电器的动作时间。此外,通过引入低带宽通讯网络可以有效地避免继电器的误触发。最后,通过建立混合整数非线性规划模型来量化所研究的问题,并通过粒子群优化算法进行求解,仿真分析验证了所提出方法的有效性。

With the gradual increase of penetration rate of distributed energy generation in active distribution network,the system's requirements for rapid coordination and protection of distribution network are also gradually improved.In order to realize safe,efficient and reliable over-current protection of distribution network,a cooperative protection method based on auxiliary directional over-current relay is proposed to achieve rapid protection in circular distribution network.Firstly,it is analyzed in detail that the directional over-current relay being divided into different links of the ring active distribution network is the main reason to hinder the rapid response protection.Then,it is proposed that by adding auxiliary relays in each link,the strict constraints of system protection can be effectively relaxed,the protection efficiency can be improved,and the action time of relays can be greatly reduced.In addition,the introduction of low bandwidth communication network can effectively avoid the false triggering of relays.Finally,the problem is quantified by establishing a mixed integer nonlinear programming model,and solved by using particle swarm optimization algorithm.Simulation analysis verifies the effectiveness of the proposed method.