考虑保护重要度的环网最优断点集计算方法

Method for determining optimal break point set considering relay protection importance in multi-loop power network

在环网保护整定计算中,最小断点集的求取是关键步骤之一。考虑到不同最小断点集间存在的差异,引入了保护重要度评估指标作为断点集的评判依据,对量子离散粒子群算法进行了改进,建立了求取最优断点集的目标函数,提出了一种最优断点集的计算方法。该方法综合考虑保护风险度、保护后备依赖度和节点重要度,较为全面地评估了断点保护的重要性,同时基于改进量子离散粒子群算法具有较强寻优能力的特点,确保求得的断点集基数最小且保护重要度最低。算例仿真分析验证了本文所提方法的有效性。

Determining minimum break point set is one of the key steps of setting and calculating of relay in a multi-loop network. A method for determining the optimal break point set is proposed. To assess the difference ofminimum break point set,the concept of relay importance is introduced. The objective function can be built based on the improved quantum-inspired binary particle swarm optimization algorithm for the optimal break point set.Thus the method takes the risk and backup dependency of relay and the importance of node in system into account,and makes a comprehensive assessment of the importance of the break point set. At the same time based on strong searching ability characteristics of the improved quantum-inspired binary particle swarm optimization algorithm,the minimum base of break point set and the lowest importance of the result can be ensured. The effectiveness of the proposed method is validated with simulation analysis.