Research On Dangerous Coefficient Of Power System Cascading Failure Based On Improved Bat Algorithm

Power system cascading failures often cause system blackout accidents.The development of cascading failures is mainly manifested in uncontrolled successive tripping of power components.In the early stage,it usually manifests as circuit breaker cascading tripping.Therefore,we study the circuit breaker tripping situation and its Related issues are of great significance to prevent the occurrence of cascading failures.In this paper,starting from the critical condition of circuit breaker tripping,combining the bat algorithm and its related improved algorithms,this paper studies the dangerous coefficient of cascading failures of the power grid under the initial fault disturbance.First of all,this article analyzes the cascading fault tripping manifestations at the branch and power grid levels for the widespread deployment of distance protection in my country's transmission grids,combined with the action behavior of the distance section ? protection,and combined with its action equation,the The critical operating state of the generator tripping is discussed.From this,further combining the inherent physical constraints of the power system,the concept of the cascading failure dangerous coefficient is explained,and the mathematical model of the cascading failure dangerous coefficient is established.The objective function of the mathematical model is defined as the dangerous distance of the cascading failure circuit breaker tripping,Is the reciprocal of the cascading failure dangerous coefficient,and the dangerous distance is the minimum Euclidean distance between the critical state of the circuit breaker cascading tripping in the power system and the normal operation.The greater the possibility.Secondly,this paper uses the bat algorithm to solve the mathematical model of the dangerous coefficient.And some deficiencies of the basic bat algorithm are improved,and the performance of the bat algorithm is improved by combining Levy flight and Lagrange multiplier.And through a series of simulations,it is proved that its optimization performance is better than some other optimization algorithms.Finally,this paper carries out a simulation analysis of a calculation example,and further explains and demonstrates the mathematical model and analysis method of the given risk factor.The specific calculation example is carried out in the simulation environment of MATLAB 2016b,and is based on the bat algorithm and Lagrange respectively.The solution idea of the improved bat algorithm of the multiplier method is compiled and the analysis program is compiled,and then the IEEE-14 node system and the IEEE-39 node system are used for analysis.The simulation results show that the improved bat algorithm based on the Lagrange multiplier method is the most suitable for solving the mathematical model of the risk factor.It also shows that the mathematical model of the risk factor for cascading failures proposed in this paper is feasible and effective.Provide theoretical and technical support for further research and the actual operation of the power grid.Figure 10 table 12 reference 82...