智能变电站二次系统可靠性评估

目前电力系统可靠性的管理大部分是针对一次系统展开的，对二次系统可靠性的管理还很不完善，特别是针对智能型变电站二次系统可靠性的管理的研究还极少。从二次系统的物理结构出发，深入分析智能变电站二次系统的特点，将其抽象为网络模型来分析系统稳态正常工作概率。网络模型以智能变电站二次系统的通信链路为支路、以智能设备或子系统及交换机为节点；建立考虑通信链路传输数据可信性的支路可靠性模型以及考虑设备重要度的节点可靠性模型，设备的重要度因子用层次分析法模型获得，然后根据每个元素的可靠性数据计算得出系统的整体可靠性指标。最后通过算例表明，该法具有一定的合理性及实用性,对智能变电站设计具有一定的参考价值。

Reliability Assessment of Intelligent Substation Secondary System

At present, the reliability management in power system mainly focuses on the primary system, while pays little attention to the reliability management for the secondary system and studies on the reliability management of the secondary system of the intelligent substation are even scarcer. This essay, starting from the physical structure of the secondary system, presents an in-depth analysis of the characteristics of the secondary system of the intelligent substation, abstracting the system and translating it into a network model to analyze the steady-state normal working probability of the system. The network model takes the communication links of the secondary system of the intelligent substation as its branch routine and the intelligent device or subsystem and switch as its node; and then establishes respectively the branch reliability model which takes into consideration of the credibility of the data transferred by the communication link and the node reliability model which takes into consideration of the importance factors of equipment (the factors are obtained by analytic hierarchy process model), and then calculates the overall reliability index according to the reliability of each element. Finally, through an actual example, it clearly indicates that the method is reasonable and practical, and has certain reference value to the design of the intelligent substation.