提高系统可靠性的配电网络多目标重构区间方法

提出了基于可能度概念的区间数大小比较通用数值计算方法。将区间分析应用于提高配电系统可靠性的措施中，提出并实现了以提高系统可靠性为目标的配电网络重构的区间方法。区间算法以特定的系统可靠性指标或系统停电损失费用与网损费用的加权和作为综合评价值，以综合评价值减少的可能度最大化为目标函数。算法考虑可靠性参数与网络动态变化的不确定因素，采用三相区间潮流和区间可靠性算法，进行隐含并行寻优，不仅求得了优化的网络结构，并且给出了网络结构的优化程度，最大可能地降低决策风险。算例分析表明该算法实用、有效。配套软件成为配电系统规划及运行的灵活、易用的工具。

INTERVAL ANALYSIS BASED MULTI-OBJECTIVE NETWORK RECONFIGURATION FOR DISTRIBUTION SYSTEM RELIABILITY IMPROVEMENT

The general method for ranking interval numbers based on the concept of possibility is proposed. A numerical solution for comparing interval numbers is presented based on Gaussian quadrature. An interval method for multi-objective network reconfiguration is further presented as a means for improving the distribution system reliability. The interval objective functions considered are minimization of energy losses and average energy not supplied (ENS), minimization of system average interruption frequency index (SAIFI) and system average interruption duration index (SAIDI), maximization of average service availability index (ASAI), minimization of customer average interruption duration index (CAIDI), load balancing and voltage quality improvement, etc. This method takes into consideration the uncertainty of system parameters and aims at globally maximizing the possibility of reliability improvement and minimizing energy losses. Moreover, the implicitly parallel search algorithm, a novel very largerscale neighborhood search methodology for interval network reconfiguration, is initiated by the authors. Its capability of finding the optimum configuration is comparable to the simulated annealing (SA), while its speed is much higher than the latter. Numerical results demonstrate that the interval method is valid and effective. The corresponding software provides a flexible and easyto-use tool for distribution system planning, engineering and operations.