基于启发式规则与AHP-CRITIC算法的配电网故障恢复策略

Service restoration strategy of a distribution network based on heuristic rules and the AHP-CRITIC algorithm

智能配电网的自愈控制对提高整个电力系统的供电可靠性至关重要。针对含分布式电源的配电网故障恢复问题,提出了基于启发式规则与AHP-CRITIC算法的配电网故障恢复策略。首先,通过广度优先搜索的方法遍历停电区域内所有具有黑启动能力的分布式电源,形成孤岛供电。其次,对剩余失电区域采用启发式规则,以生成用于配电网故障恢复的候选方案集。最后,考虑故障恢复的目标,引入负荷容量裕度、负荷转移量、负荷恢复比例、开关操作次数和电压降落五个评价指标,分别计算候选方案的各评价指标。并使用改进的AHP方法和CRITIC方法对方案进行评估。同时引入综合权重并计算各方案与理想点之间的偏离度,确定最优故障恢复方案以恢复剩余失电区域供电。通过算例分析验证了所提方法在解决配电网故障恢复问题上的有效性。

The self-healing control of the intelligent distribution network is of vital importance for improving the reliability of an electric power system.For distribution network fault recovery with distributed generation,a fault recovery strategy for a distribution network based on heuristic rules and the AHP-CRITIC algorithm is proposed.First,all distributed generators with black-start capability in the blackout area are traversed by a breadth-first search method to form islands and restore power supply.Secondly,by use of heuristic rules in the residual power-loss area,a candidate service restoration scheme set is generated.Thirdly,for service restoration,five evaluation indices such as the proportion of load restoration,switching times of circuit breakers,voltage drop,the margin of load capacity and the quantities of transferred load are introduced.Then the evaluation indices of candidate schemes are calculated,and these schemes are assessed by improved AHP and CRITIC methods.By introducing the idea of comprehensive weight,the deviation between each scheme and the ideal point is calculated to establish the optimal fault recovery scheme for restoring the power supply in the residual power-loss area.Calculation results of a distribution network with five feeders show that the proposed method is effective.