基于受冲击与断开后果脆弱度的电网关键线路识别

综合线路断开可能性和断开后果,提出基于受冲击与断开后果脆弱度的电网关键线路识别方法。定义线路受冲击脆弱指标,从其他线路对目标线路造成的潮流冲击影响及目标线路本身的抗冲击韧度两方面评估线路开断概率。同时考虑电网的电气结构和状态转移特性,构建包含电气结构重要度、支路开断脆弱指标、节点电压偏移量的指标集。基于模糊层次分析(FAHP)与改进熵权法建立线路断开后果评估模型。结合线路受冲击脆弱指标与断开后果脆弱指标定义综合脆弱性指标,全面衡量电网线路的脆弱度。IEEE39节点系统仿真结果验证了所提出的识别脆弱线路方法的有效性。

Critical lines identification in power grid based on vulnerability of line under impact and disconnection consequence (School of Electric Power Engineering, Nanjing Institute of Technology, Nanjing 211167, China)

Considering the possibility and consequence of line disconnection, a method based on vulnerability of line under impact and disconnection consequence is proposed to identify vulnerable lines in power grid. The vulnerability index of line under impact is defined to evaluate the probability of line breaking from two aspects:the power flow impact of other lines on the target line and the toughness of the target line itself to resist impact. The electrical structure and state transfer characteristics of the power grid are considered at the same time, an index set including the importance of electrical structure, the vulnerability index of line disconnection and the voltage offset of node is constructed. Based on the Fuzzy Analytic Hierarchy Process (FAHP) and the improved entropy weight method, a model for evaluating the consequence of line disconnection is established. Comprehensive vulnerability index is defined by combining the vulnerability index of line under impact and the vulnerability index of disconnection consequence to roundly measure the vulnerability degree of lines in power grid. Simulation results of the IEEE39 node system verify the effectiveness of the proposed method. This work is supported by National Natural Science Foundation of China (No. 51577086) and Natural Science Foundation of Jiangsu Province (No. BK20160778).