Research On Loss Reduction And Reconstruction Of Active Distribution Network Considering Distributed Power Source Access

With the rapid development of renewable energy generation technology,more and more distributed power sources are connected to the distribution network.However,due to the instability and intermittency of new energy output,it brings great challenges to the optimization operation of the distribution network.Therefore,it is necessary to seek a new method for optimizing the operation of the distribution network to ensure the effective access of new energy,while ensuring the stable operation and power supply quality of the distribution network.This article aims to fully consider the problem of loss reduction and reconstruction of active distribution networks under the condition of distributed power generation access,explore the mechanism of active and reactive power coordination loss reduction,propose a two-stage active and reactive power coordination loss reduction method for distribution networks considering new energy access,and a multi period reconstruction loss reduction method for distribution networks considering intelligent soft switches under high proportion of new energy access.Firstly,the coupling characteristics of active and reactive power in the distribution network were analyzed,and the impact of active and reactive power control on operating parameters such as voltage and network loss were explored.A detailed analysis was conducted on the grid connection methods of various distributed controllable resources in the system,as well as the active and reactive power output characteristics of each controllable equipment,and corresponding mathematical models were established.Combining the coupling characteristics of active and reactive power and the regulation characteristics of controllable equipment,it is demonstrated that active and reactive power coordination optimization can comprehensively improve the operational economy and safety of active distribution systems.Secondly,a two-stage active and reactive power coordinated loss reduction method for distribution networks considering new energy access was studied.Establish a power flow model based on Distflow and perform second-order cone relaxation on the model.Model the power flow of the distribution network with photovoltaic and wind power connections,linearize the discrete capacitor devices and OLTC gears using the BIG-M method.In the previous stage,the active and reactive power coordination method was used for optimization to determine the action amount of slow response equipment.Reduce the single optimization time during the intraday phase and optimize every hour to complete the rolling reactive power optimization during the day.The accuracy of the relaxed model and the superiority of the active and reactive power coordinated loss reduction strategy based on two-stage rolling optimization were verified through simulation calculations,which also compensated for the lack of precision in traditional optimization caused by the volatility and uncertainty of new energy.Finally,the problem of distribution network reconstruction considering the integration of new energy into the distribution network was studied.In order to further improve the efficiency of distribution network loss reduction and the economy of reconstruction under the integration of distributed power sources,intelligent soft switches were involved in the process of reconstruction loss reduction.A multi period loss reduction strategy considering the participation of intelligent soft switches in reconstruction was proposed,and the optimization model was transformed into a mixed integer second-order cone programming problem using second-order cone relaxation technology,And the commercial solver CPLEX was used to solve the converted problem.An example analysis was conducted on an improved IEEE 33 node system,and the performance and relaxation accuracy of the algorithm were verified to verify the effectiveness of the proposed strategy.