Research On Planning And Blocking Management Of Distribution Network With Electric-Hydrogen Hybrid Microgrid

China’s social and economic development has entered the stage of high energy consumption.The contradiction between the increasing demand for electricity and the constant consumption of energy makes the development of new energy become the hot spot of The Times.However,the incorporation of high-permeability distributed power sources into the distribution network presents both opportunities and challenges to the planning and operation of the distribution network.The randomness,intermittence and fluctuation of new energy output make how to make rational and efficient use of new energy become an urgent problem to be solved.As an important carrier of new energy generation,microgrid can effectively solve the problem of grid connection caused by a wide variety of distributed power sources and different characteristics,and achieve flexible and efficient application of new energy.Under the background of the new energy revolution,the traditional distribution network planning and operation methods are no longer applicable.Therefore,on this basis,this paper mainly studies the planning and congestion management of distribution network with electro-hydrogen hybrid microgrid.The specific work is as follows:(1)First of all,from the perspective of the whole society,based on the structure of the electro-hydrogen hybrid microgrid,which is composed of wind power,photovoltaic power generation,micro gas turbine power generation,storage of batteries and hydrogen production devices,this paper comprehensively analyses the costs and benefits of the development of the full life cycle electro-hydrogen hybrid microgrid,and comprehensively evaluates the economy of the system.Considering the influence of different types and capacities of distributed power supply on the performance of microgrid system,the constant volume problem of distributed power supply in microgrid is firstly studied.On the premise of satisfying the specific constraints,a two-layer optimization model of microgrid system was established with the objective function of maximizing the comprehensive income in the whole life cycle.In this two-layer optimization model,the adaptive particle swarm optimization algorithm is used to solve the optimal configuration of the system in the upper layer,and the CPLEX solver is used to solve the optimal scheduling scheme in the lower layer.On the basis of this,the cost,benefit and self-balance rate under the optimal configuration of a specific example are compared and analyzed by using the economic evaluation model of the whole life cycle,and the conclusion is drawn that the electro-hydrogen hybrid microgrid is economical;(2)The planning of distribution network system with electric hydrogen hybrid microgrid includes the capacity and location planning of substation and the network structure planning of distribution network system.In this paper,an equivalent model of electro-hydrogen hybrid microgrid is established based on the above characteristics of electro-hydrogen hybrid microgrid.Based on the principle of equal load,the capacity and location planning model of substation considering geographical factors is established,and the continuous location method of multiple power sources is used to solve the model.In view of the problems of large amount of calculation,long solution time and difficult convergence of the results in the traditional grid planning model solution method,a distribution grid model solution method of electro-hydrogen hybrid microgrid based on the improved minimum spanning tree algorithm is proposed by combining the minimum spanning tree algorithm in graph theory.In this method,the investment cost and system stability are considered comprehensively,and the weight of each branch is converted into the weight of each branch,and the weight of each edge is adjusted dynamically repeatedly.Aiming at minimizing the total weight of spanning tree,the coordinated planning of network was carried out to solve the network planning problem of distribution network system with electro-hydrogen hybrid microgrid.Finally,this paper verifies the correctness of the model with a specific example,and analyzes the influence of the addition of electro-hydrogen hybrid microgrid on the planning of distribution network system,which provides ideas for subsequent planners to formulate a more reasonable scheme;(3)The disordered access of microgrid is easy to cause channel blocking in distribution network.In this paper,the congestion management model of distribution network system with electro-hydrogen hybrid microgrid guided by price mechanism is established.A DC power flow algorithm based on power transfer distribution factor is presented to simplify the system topology.Based on lagrange multiplier method,the microgrid side and the distribution side are solved and optimized respectively.Microgrid aggregators are introduced as the bridge for day-ahead scheduling negotiation between multi-micro-grid and distribution network,and the two-side model is solved by Nash equilibrium based on the master-slave game distribution network market operation framework.Finally,the model is simulated by an IEEE33 node system to verify the feasibility and effectiveness of the model.Through formulating reasonable market mechanism,the problem of channel blocking of distribution network is alleviated.