配电网保护配置方案评估方法

配电网中相对宽松的继电保护配置与整定要求，导致同一配电网有多种保护配置方案。为定量比较不同保护配置方案的性能优劣，提出一种以能量损失作为性能评价指标的评估方法。首先，通过分析继电保护”四性“要求以及长时、短时停电概念，建立能量损失的计算与比较模型；然后，根据保护方案的配置差异确定用于组成故障场景的随机变量，利用蒙特卡洛方法实现随机故障场景的生成，得到不同故障场景下各个方案的能量损失；最后，统计各个保护方案能量损失的平均值，选择平均能量损失最小的方案为性能最优的方案。用配电网保护不同定值和混合线路是否配置自动重合闸两个算例验证了该方法的有效性。

Evaluation Method of Protection Configuration Scheme for Distribution Network

One distribution network often has several kinds of protection configuration schemes because of loose requirements for distribution system protection. An evaluation method based on energy loss as performance evaluation index is proposed to quantitatively compare the performance of different protection configuration schemes. Firstly, the calculation and comparison model of energy loss is established by analyzing four fundamental requirements of protection relay and the concept of long and short-term outage. Then, random variables used to form fault scenarios are determined according to different protection configurations. Monte Carlo method is used to generate random fault scenarios. Then, energy loss of different schemes in different fault scenarios can be calculated. Finally, the average energy loss of each protection scheme is calculated, and the scheme with the smallest average energy loss is selected as the best one. The validity of this method is verified by two cases of distribution network protection with different setting values and hybrid lines with or without automatic reclosing.