Research On Fault Location And Recovery Strategies Of Distribution Network

The rapid economic and social development has rapidly increased the demand for electricity,and the scale of the distribution network has continued to expand.At the same time,a large number of distributed power sources with low pollution and high flexibility have been connected to the grid,which has increased the complexity of the distribution network.Once a fault occurs,it is very easy to cause a large-scale power outage,and the safe and reliable operation of the power grid is seriously threatened.In addition,the access of distributed power sources makes the traditional radial distribution network change in power flow,network loss,voltage,etc.The original distribution network fault location and fault recovery methods have limitations,so the research is applicable It has important practical significance for the fault location method and fault recovery of the distribution network with distributed power sources.In order to verify the universality of the research method,this paper selects a large-scale distribution network as the research object,focusing on improving the accuracy of fault section location and reducing the network loss and voltage offset of fault recovery.The main tasks are as follows:1.Research on fault location strategy.Based on the access of distributed power sources,based on the existing fault location theory and method,the particle swarm algorithm is improved and combined with the genetic algorithm,the dual population hybrid algorithm is used to locate the fault section,and the hybrid algorithm fault location process is completed Design,fault section location simulation test,etc.The simulation analysis shows that the dual-population hybrid algorithm in this paper reduces the optimization iteration times of the single particle swarm algorithm by nearly twice,regardless of the single failure or multiple failures,which has obvious advantages.2.Research on failure recovery strategy.Taking network loss and voltage offset as the objective function,the method of node layering,forward push and back-substitution is used to calculate the power flow,and it is simulated and verified in the IEEE33 node model.The results show that the network loss and voltage offset after fault recovery are significantly reduced,so the fault recovery reconstruction strategy in this paper has a certain feasibility.3.Build a line fault monitoring platform.Select OPC as the communication method of data interaction,use MATLAB,SIMULINK and Kingview software to build the simulation platform and write related programs,and query the status of the distributed power supply on the host computer,locate the faulty section,and restore the fault,etc.Functional module interface design.After testing,the monitoring platform verifies the research conclusions given in this article and meets the expected requirements.