Identification Method for Key Lines of Power Grid Considering Outage Probability Entropy and Grid Structure Entropy
The probability of line outages exerts a crucial influence on the triggering and evolution of cascaded failures.However,the existing study regarding the equilibrium of the distribution of line outage probabilities in power grids suffers from insufficient considerations.In this paper,by integrating the analysis methods of complex network theory and entropy theory,a method for identifying key lines in power grids that comprehensively considers the entropy of outage probability and the entropy of grid structure is proposed,aiming to quantify the comprehensive influence of lines at the levels of the operational state and network state of the power grid.Firstly,based on the line outage probability model,the indicators of the entropy of outage probability distribution and the entropy of outage probability variation are put forward,differentiating the influence of the three states of line power flow within the normal range,between the normal and limit values,and greater than the limit value on the identification results,overcoming the deficiency of insufficient consideration of the direct factors affecting line faults in the existing indicators.Secondly,combined with the improved entropy of grid structure,a comprehensive indicator of key lines reflecting the grid structure and operation state of the power grid is proposed.Then,in combination with the power balance strategy,a method for identifying key lines in the power grid is proposed.Finally,based on the improved network efficiency indicator,simulations are conducted on the IEEE 39-bus system and IEEE 118-bus system,which verify the feasibility and correctness of the proposed method.
line identificationcomplex networkcascaded failureentropyoutage probabilitynetwork effectiveness
万方数据
维普
