Research On Cooperative Planning Method Of Distributed Power Generation And Distribution Automation Terminal

As the problems of carbon emissions and energy shortages are gradually getting people’s attention,clean and efficient distributed power generation will become one of the future development directions,and the load access in the distribution network will gradually become diversified,a large number of electric vehicles access to the distribution network has become a part that cannot be ignored.The access of distributed power sources and electric vehicles and other factors will make the operation mode of the distribution network,the network structure,the layout of the distribution automation terminal,and the reliability evaluation model and method more complicated.In view of this,this thesis studies the planning methods and reliability evaluation methods of electric vehicles,distributed power supply and distribution automation terminals in the distribution network.The contents are as follows:Firstly,in view of the problem that the charging and discharging mode of electric vehicles affects the operation and division of islands and complicates reliability evaluation,the reliability evaluation method combining recursive search and Monte Carlo is improved.This method fully takes into account factors such as orderly charging and discharging of electric vehicles,distribution automation terminals,and distributed power sources.The recursive search algorithm can quickly search for relevant information about the load node to be evaluated,and it is combined with Monte Carlo simulation.the reliability evaluation process of distribution network with multiple factors can be optimized,that is,the minimum failure period is simulated,the discrimination flag is set,and the power outage time of the load in each period is sequentially calculated,so as to accurately obtain the reliability index.The effectiveness of this method is verified.Secondly,this thesis studies the planning method of distribution network with distributed power supply and distribution automation terminal.This method takes into account that after a fault occurs in the distribution network,the load downstream of the fault can form an island through the cooperation of distributed power sources and distribution automation equipment to ensure continuous power supply.Therefore,a reasonable island division is required in the planning.Established a two-level planning model considering the location and capacity of segmented switches,distribution automation terminals,and distributed power sources.The upper level programming model takes the comprehensive operation cost as the objective function,including operation and maintenance cost,network loss cost and other costs,to optimize the location capacity of the distributed power supply.The lower level programming model takes the cost of segment switch and distribution automation terminal and the outage loss of users as the objective function to optimize the location of segment switch and the type and number of distribution terminal,and the reliability index adopts the reliability algorithm based on recursive search.Comparative analysis verifies the effectiveness of this method.Finally,on the basis of the above,considering factors such as the charging and discharging mode of electric vehicles,the timing characteristics of distributed power sources and loads,a collaborative planning method of distributed power sources and distribution automation terminals that take into account electric vehicles is proposed.The operation strategy of islanding after failure under the cooperation of,energy storage,and distributed power supply,and the isolated islands are effectively divided by the method of planned island division.Established a two-layer collaborative planning model.The upper level programming model takes the economic costs of wind power generation,photovoltaic power generation,energy storage,investment,operation and maintenance costs of charging stations,network loss costs and other economic costs as objective functions to optimize the location and capacity of wind-solar storage,The lower level programming model optimizes the configuration of distribution automation terminal by taking the cost of segment switch and distribution automation terminal and the user’s outage loss as the objective function.Reliability calculation of distribution network is based on improved recursive search combined with Monte Carlo simulation,and the effectiveness of the proposed method is verified by comparative analysis of the three schemes...