变电站主接线方式可靠性评估与方案优选

Reliability Assessment and Optimization of Main Electrical Connection of Substation

针对传统可靠性评估方法在变电站主接线可靠性评估中的局限性,用贝叶斯网络法对变电站主接线进行可靠性评估且对其方案优选。为此,选取两种目前常用的主接线方式作为应用实例,首先针对系统进行功能和结构分解,获得系统各功能模块的逻辑关系图,然后确定从发电机到负荷端的最小路径,并以此为过渡建立以各功能模块为节点的贝叶斯网络,在此基础上计算出两种主接线方式的系统可用度,并找到两种主接线方式在可靠性方面的薄弱环节。计算结果表明,贝叶斯网络法既能帮助工程人员选择变电站主接线方式,还可指导今后变电站的维修工作,具有较大实际意义。

In view of the limitations of traditional reliability assessment methods about on the main electrical connection of the substation, Bayesian network was applied to the reliability assessment and optimization of main electrical connection of substation. For this purpose, the example selected of two kinds of common main connection mode. Firstly, decomposed system according to the structure and function and obtained the logic diagram. Secondly, determined the minimum path from generator to the load and established the Bayesian networks which the function module was the node. Finally, calculated the system availability on basis of the Bayesian networks and found the weak links of reliability in the two main electrical connection. Calculation results show that the Bayesian network can help engineers to choose substation main electrical connection and guide maintenance work in the future, has a greater practical significance.