Study On Fault Location Of Distribution Network Based On Matrix-Fruit Fly Optimization Algorithm

As the last link of power supply service,the power distribution network bears the burden of ensuring stable electricity consumption of users and improving power quality.With the rapid promotion of the new mode of "Dual-carbon Economy",the penetration rate of distributed clean energy to the power distribution network has been improved,naturelly,which maked the stability of the power system face new challenges.Therefore,it is of great significance to study a more rapid and reliable fault location method for the scheduling optimization and stable operation of the power distribution,also for the healthy development of regional economy.In view of this,this paper proposes a fault section location method based on the improved matrix-fly optimization algorithm,which can accurately locate the fault section between the intelligent feeder terminals in the distribution network by comparing the location results of the matrix algorithm and the fly optimization algorithms.First of all,this paper expounds the background and research significance of this subject,summarizes the feeder automation technology and various fault location methods at home and abroad,and also illustrates the line parameters when horizontal and vertical faults occur in the power distribution network.Considering that the distributed generation will have different effects on the fault current after combined to the grid in different position,which cause poor fault tolerance,slow speed and low accuracy of the traditional distribution network.Therefore,in order to ensure the accuracy and reliability of the location method,this paper established an electromagnetic transient simulation model,analyzed the connection of distributed generation to bus and feeder,established the theoretical basis for the proposed location algorithm,and expounded the type and grid combination criteria of distributed generation.Secondly,basing on the advantages of simple logic,easy implementation and small memory occupation of matrix algorithm in fault location,this paper designs a new algorithm that solves multiple power grid combination problem through the power distribution vector,and to reflect the fault section with the open joint position,which simplifies the calculation process,eliminates the influence of distributed power grid combination on the algorithm,and further plays the advantages of matrix algorithm.At the same time,aiming at the fruit fly optimization algorithm has few parameters,fast iteration speed but initial value generation blindness,global search ability and local search ability contradiction.This paper improve the optimization accuracy through the introduction of Logistic chaotic map improvement strategy improve the ergodicity of initial value generation of the algorithm,and conduct the P-best-worst improvement strategy to solve the problem that the algorithm is easy to fall into local optimization.Performing the algorithmic ablation experiments in the simulation software MATLAB,through the simulation,it can be concluded that the improved strategy has significant effect.Ultimately,for the sake of futhur improvement of the location speed of the algorithm,a hierarchical model of section location is designed,which simplifies the calculation process,reduces the dimension of algorithm operation,and improves the location efficiency.In addition,in order to apply the algorithm to the distribution network fault location,binary optimization of the initial value of the fruit fly algorithm,improve the switching function under the background of distributed generation grid combination,and a new objective function is designed.That solve the problem of miscalculation and multiple solution arising in the location process of the traditional algorithm.To verify the effectiveness of the proposed location strategy,this paper builds the simple radiated distribution network based on IEEE33 node and the MATLAB simulation mathematical model with grid combination distributed generation distribution network.Through simulation verification and analysis,it is concluded that the location strategy in this paper has faster location speed and accuracy,and the static simulation experiments of active distribution network for various preset fault types show that the location strategy can quickly and accurately locate the fault section under various fault types,which has practical application value.