摘要
电网中存在的某些脆弱环节对系统大停电事故有着重要的影响。为了有效辨识出这些脆弱环节,提出了基于保护脆弱度加权拓扑模型下的脆弱性评估方法。定义了保护配合度、保护故障严重度和保护脆弱度,并以此提出了单元保护脆弱强度的概念,量化了保护装置的脆弱度对电网中单元脆弱性的贡献程度;建立了基于保护脆弱度的拓扑模型,并给出了加权后相应复杂网络参数的定义;由此,提出了结合单元保护脆弱强度与介数的电网脆弱性评估方法。算例结果验证了所提方法在保持复杂网络理论对结构脆弱性有较好辨识效果的基础上,有效地计及了保护装置脆弱性因素对电网脆弱性的影响,提高了脆弱辨识效果和精度,表明该方法简单有效,具有一定的应用前景。
Certain vulnerable links in the power grid have serious impacts on large-scale blackouts. To identify these vulnerable links effectively, a vulnerability evaluation method of power grid based on the protection-vulnerability-weighted topological model was proposed in this paper. Coordination degree of protections, fault severity of protections and protection vulnerability were defined, which were used to propose the concept of protection vulnerability of units in order to quantify the contribution of protection vulnerability to the fragility of units. Weighted topological model based on the protection vulnerability was established, and definitions of corresponding characteristic indices of the weighted topological model were given. Based upon all, an vulnerability evaluation method combining betweenness and protection vulnerability of units was presented. Results of a numerical example verified that the proposed method keeps a good effect of complex network theory in structural vulnerability identification, effectively considers the impact of the factor of vulnerability of protections on the vulnerability of units in the grid, and enhances the effect and accuracy of the identification of vulnerability, and thus demonstrate validity and prospect for application of the proposed method.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2014年第4期613-619,共7页
Proceedings of the CSEE
关键词
电力系统
复杂网络理论
保护脆弱度
单元保护脆弱强度
脆弱性评估
power system
complex network theory
protection vulnerability
protection vulnerability of units
vulnerability evaluation
