基于改进最小路的低压配电系统可靠性评估  

Reliability evaluation of low-voltage distribution system basedon improved minimal path method

作　　者：毛澍 闫志彬 闫涛 王金宇 刘伟 谈军 王晓楠 康健 张丽 MAO Shu;YAN Zhibin;YAN Tao;WANG Jinyu;LIU Wei;TAN Jun;WANG Xiaonan;KANG Jian;ZHANG Li(Power Reliability Management and Project Quality Supervision Center,National Energy Administration,Beijing 100031,China;State Grid Ningxia Electric Power Co.,Ltd.,Yinchuan Ningxia 750001,China;China Electric Power Research Institute Co.,Ltd.,Beijing 100192,China;State Grid Corporation of China,Beijing 100031,China)

机构地区：[1]国家能源局电力可靠性管理和工程质量监督中心,北京100031 [2]国网宁夏电力有限公司,宁夏银川750001 [3]中国电力科学研究院有限公司,北京100192 [4]国家电网有限公司,北京100031

出　　处：《宁夏电力》2021年第3期6-11,24,共7页Ningxia Electric Power

摘　　要：高中压配网可靠性评估的理论方法已十分成熟,但低压配网因缺乏拓扑结构和设备参数,其可靠性的精细化理论分析难以实现。针对该问题,国家能源局组织开展了低压配网的拓扑关系梳理,为可靠性解析奠定了数据基础。不同于高中压系统,低压系统至少具有三段保护结构,且低压断路器普遍存在因操作失误和保护失效的误动拒动等故障模式。为准确评估低压配网的可靠性水平,首先分析了断路器误动拒动所导致的故障影响范围,然后提出了一种基于改进最小路的可靠性解析化评估方法,可根据断路器集合间的逻辑关系解析计算出系统可靠性指标,实际算例分析证明了方法的合理性与工程应用价值。Theories and methods for reliability evaluation of medium and high-voltage distribution systems are mature,but it is difficult to carry out refined theoretical analysis on the reliability due to the lack of topology structure and equipment parameters.Unlike medium and high-voltage systems,low-voltage systems are characterized by the three-stage protection,and maloperation and operation failure due to mistakes in operation and protection failure are quite common in low-voltage circuit breakers.To accurately evaluate the reliability level of low-voltage distribution networks,the paper analyzes the influence scope of faults caused by maloperation and protection failure of circuit breaker and proposes an analytic evaluation method based on the improved minimal path method to figure out reliability index according to logic relationship of circuit breaker sets.An example analysis proves the rationality and engineering application value of the method.

关 键 词：低压配电系统 可靠性评估 改进最小路 

分 类 号：TM728.2[电气工程—电力系统及自动化]