基于可靠性提升度的配电系统薄弱线路评估方法

Evaluation Method of Weak Lines in Distribution System Based on Reliability Improvement Index

坚强的网架结构能够显著减少配电系统的停电范围和停电时间,提高配电系统供电的可靠性,而完善网架结构的措施主要包括线路开关的自动化改造和优化规划。提出一种配电系统薄弱线路评估方法,为筛选出系统中网架结构薄弱的线路提供理论依据。基于不同开关优化措施,提出可靠性提升度指标,从供电可靠性角度评价中压网架结构。为计算可靠性提升度,提出一种改进的和声搜索群算法,获取可靠性提升度最大的开关分布场景。提出以熵权-模糊-VIKOR的中压网架结构综合评价方法,对网架结构可靠性进行综合评价。选取某地区30回线路进行算例分析,结果表明所提方法能够有效筛选出网架结构薄弱的线路,实现开关优化规划项目的精准定位。

Strong grid structure can significantly reduce the scope and time if power outage of distribution system,improve the reliability of power supply.The main measures to improve the grid structure mainly include the retrofitting and optimization planning of the automation switches.This paper proposes a method for evaluating weak lines in distribution network,which provides a theoretical basis for searching of weak lines of power grid structure.The reliability improvement index is proposed to evaluate the power grid structure from the perspective of power supply reliability.In order to calculate the reliability improvement,an improved harmonic search swarm algorithm is proposed to obtain the switch distribution scenario with the greatest reliability improvement.This paper proposes a comprehensive evaluation method based on entropy-fuzzy-VIKOR to comprehensively evaluate the reliability of the medium voltage grid structure.30 lines are selected in a certain area for example analysis,the results show that the proposed method can effectively screen out the weak lines of grid structure and realize the accurate positioning of the switch optimization planning project.