应对10 kV配电网电流保护失配问题的整定优化方案

A setting optimization scheme to address current protection mismatch in a 10 kV distribution network

针对现有辐射型配电网多级电流保护因速动段保护范围重合而引起的保护误动问题,提出一种电流保护整定优化方案。首先以配电网整体故障切除时间最短、保护灵敏度最高、故障影响负荷最少等为目标函数,考虑上下级线路保护配合等约束条件,建立保护整定优化数学模型。然后,采用含约束的多目标骨干粒子群算法和K-means聚类算法求解、分析最优解特征并得到最终优化定值。其次,针对特定拓扑优化筛选后无最终优化定值的“死区”问题,提出加入主干线分段断路器位置优化的解决方案。最后,在Matlab中进行仿真验证,结果表明所提方案能够解决保护失配问题并适应不同配电网结构,有效提升配电网保护整体性能。

A current protection setting optimization scheme is proposed to address misoperation caused by the overlapping protection zones of the instantaneous section protection in a multi-level current protection system for radiating distribution networks.First,a protection setting optimization mathematical model is established by taking the shortest overall fault-removal time,the highest protection sensitivity,and the least load affected by the fault as the objective function and considering constraints such as the mutual coordination between up-and down-stream line protections.Then,a constrained multi-objective backbone particle swarm algorithm and the K-means clustering algorithm are employed to address the problem,analyze the features of the optimal solutions and select the final optimal solution.Second,aiming at the dead-zone problem of the specific topology screening without final optimization solution,a solution of adding the location optimization of the circuit breaker in the main line is proposed.Finally,the simulation results in Matlab show that the proposed scheme can overcome protection mismatches,adapt to different network structures,and improve the overall performance of distribution network protection effectively.