Research On Active Distribution Network Reconfiguration Based On Parallel Slime Mould Algorithm

With the continuous advancement of global energy transformation,green energy has gradually become the focus of attention.As an essential part of the energy industry,the green production of electric power is one of the goals of modern electric power.In this context,Distributed Generation（DG）is massively connected to the distribution network,and the access of a large number of DG will change the operation status of the distribution network.Therefore,how to optimize the operation state of modern distribution networks with access to a large number of DG and increasing scale is a hot research topic at present.As a necessary means of distribution system optimization and control,distribution network reconfiguration has been widely used in practical engineering because of its simplicity and economy.Distribution network reconfiguration can be divided into static reconfiguration and dynamic reconfiguration.Most of the research focuses on the establishment of the reconfiguration model and the improvement of the reconfiguration method.Therefore,this thesis constructs a reconfiguration model based on several indexes that are beneficial to the operation of the distribution network.The thesis also proposes a new Parallel Slime Mould Algorithm（PSMA）based on the Slime Mould Algorithm（SMA）for solving the model of reconfiguration distribution network.The highlighted points of the thesis are emphasized as its primary work as follows:（1）According to the different working principles of DG and the way of connecting to the power grid,they are divided into four types,and the corresponding mathematical model of power flow calculation is established.Then Newton-Laphson method,Implicit Z_bus-Causs method,and Forward-backward Sweep method are studied in power flow calculation.According to the advantages and disadvantages of the three methods and the coding requirements of the distribution network reconstruction problem,the Forward-backward Sweep method is selected as the power flow calculation method in this paper.（2）Propose a new algorithm,PSMA,according to the characteristics of distribution network reconfiguration,the shortcoming of SMA,the adaptive inertia weight strategy,and the multi-subgroup parallel communication strategy.To verify the performance of the PSMA algorithm,some functions of the CEC2014 international standard test suite are used to carry out numerical optimization experiments,and the results are compared with the other five algorithms.Experimental results show that PSMA has superior optimization accuracy and fast convergence ability under the action of the proposed improved strategy.（3）Construct the optimal distribution network models according to the optimization indexes of several distribution network operations.The analytic hierarchy process（AHP）is used to process them comprehensively,and the static reconfiguration model of the distribution network.According to the different characteristics of DG,six static reconfiguration cases are designed and solved using the PSMA algorithm and four other algorithms.Experimental results show that different types of DG have different effects on the distribution network.Compared with the other four algorithms,the PSMA algorithm can solve the static reconfiguration problem of distribution networks with DG quickly,efficiently,and accurately.The PSMA algorithm provides a new solution for the static reconfiguration problem of the distribution network with DG.（4）Implement the dynamic reconfiguration of the distribution network with load and DG output varying with time.A dynamic optimal period division method was proposed and combined with PSMA.Then a multi-time optimal dynamic reconfiguration method based on PSMA is proposed.Then,the proposed method is compared with the hourly dynamic reconfiguration method,and simulations are carried out in the power distribution system of the IEEE-33 node without DG and the IEEE-118 node with DG respectively.The experimental results show that the proposed dynamic reconfiguration method can find the appropriate reconfiguration time point according to the load sequence,and achieve the approximate effect of simulating the actual operation of the distribution network.