The concept of connection number and its operation rules are introduced,and a connection number model(CNM)is presented for a logical comparison of connection numbers.

• 介绍了联系数概念及其运算准则,提出了联系数大小比较的联系数模型和基于联系数模型的电网灵活规划模型,在该规划模型中采用成本效益分析法评价方案的优劣程度。