Research On Fault Location Method Of Distribution Network

In the current social situation,people’s requirements for power supply reliability are increasing day by day.In the power system,the probability of failure in the distribution network area is relatively large,so the location of the distribution network fault section is the basis for ensuring reliable power supply.Due to the fact that the traditional fault section locating method is not applicable due to the grid connection of distributed power,this paper based on the traditional fault section locating method based on logical relationship and algebraic relationship,this paper derives the fault section locating model of distribution network with distributed power supply And methods to solve the problem of positioning the distribution section of the distribution network after the distributed power is connected to the grid.Firstly,the mathematical models of various distribution network fault location without distributed power are introduced,which are mainly divided into distribution network fault location models based on logical relationship and algebraic relationship.Then analyze the change of the switching function when the d istributed power is connected to the grid,and improve the traditional distribution model of distribution network fault section based on algebraic relationship,and transform it into a distribution network fault section positioning model with distributed p ower.Secondly,the mathematical principle and solution steps of the branch and bound method are introduced,and the algorithm is used to simulate and verify the linear integer programming model of the distribution network fault section location in a varie ty of DG switching conditions and multiple fault conditions.The correctness of the linear integer programming model for fault section location in distribution network is discussed.Comparing with the standard differential evolution algorithm(DE),the exp erimental results show that the higher the distortion of the overcurrent information uploaded by the FTU,the lower the accuracy of the differential evolution algorithm,and the branch and bound algorithm is not subject to the distortion of the overcurrent information uploaded by the FTU It has more advantages in accuracy and algorithm stability.Thirdly,the mathematical model and solution process of the interior point method are introduced,and the interior point method is used to simulate the simulation of the nonlinear complementary constraint model for the distribution of faulty sections in the distribution network under multiple DG switching and multiple fault conditions.The correctness of the nonlinear complementary constraint model for fault section location in distribution network is verified.Comparing with the harmony algorithm and the optimized harmony algorithm,the results show that the harmony algorithm and the optimized harmony algorithm have certain fault tolerance when the FTU uploads the overcurrent information matrix distortion,and it is easier to deal with discrete variables,but the numerical value Compared with the interior point method,the stability and decision-making efficiency are still insufficient.