考虑脆弱度与均衡度的电网运行评估

Operational Assessment of Regional Power Grid Considering Vulnerable Degree and Balance Degree

为快速评估复杂电网网架的脆弱性、可靠地辨识网架中的薄弱环节,应用复杂网络理论计算了电网脆弱度,再结合电网均衡度指标,探讨了在负荷变化情况下三门峡市电网的脆弱度、均衡度及不同介数值线路对电网均衡度的影响。结果表明,具有高介数值的线路对系统均衡度的影响大于低介数值线路,前者也更易成为网架中的薄弱环节;分布式发电的引入对电网的脆弱度与均衡度均有一定程度的改善作用。

In order to quickly evaluate the vulnerability of a complex power grid network and reliably identify the weak links in the network,the vulnerable degree of the power grid network is calculated based on the complex network theory.The vulnerable degree and the balance degree of Sanmenxia power grid are evaluated under the circumstances of load growth.And then the influence of different line betweenness on the balance degree of grid is discussed.The results show that the network will suffer greater balance degree loses if one of its power lines with higher edge betweenness is under attack.Also the power lines with higher edge betweenness are more likely to become the weak links in the network.Meanwhile,the integration of distributed generation can improve the vulnerable degree as well as the balance degree of the network to some certain degree.