Consider The Optimal Operation Strategy Of Electric Vehicles Connected To Multi-energy Systems

At present,my country is in a critical period of energy transformation and upgrading.The construction of a new multi-energy power system with new energy as the main body is the key to achieving the goal of "carbon peaking and carbon neutrality" in my country’s energy revolution.In the multi-energy system,the large-scale grid connection of wind power and photovoltaic power generation and the large-scale access of flexible loads such as electric vehicles have increased the complexity and uncertainty of the power grid.Electric vehicle(EV)cluster access not only It has caused a huge impact on the power grid and affected the power supply quality of the power grid.In order to reduce the impact of a large number of EVs on the power grid and improve the quality of power supply and economic benefits,this paper studies the orderly charging problem of electric vehicles connected to the multi-energy system on the distribution grid side and the formulation of optimal operation strategies.Firstly,this paper analyzes the basic usage characteristics of EVs,the impact of EV access to the distribution network,and the research status of EV charging strategy optimization.The probability density function of mileage is solved by Monte Carlo method,and the daily charging load curves of different types of EVs are obtained,and their characteristics are analyzed.Secondly,on the basis of studying the daily charging load curves of different types of EVs,this paper proposes a Harmony Search(Harmony Search)based on Levy flight for the problem that the large-scale access to disordered charging of EVs in residential areas will adversely affect the distribution network.Search,HS)algorithm to optimize EV orderly charging problem.The algorithm considers the influence of EV disorderly charging on line voltage deviation and distribution transformer load rate,and takes the lowest EV charging cost and the smallest distribution transformer load peak-to-valley difference as the optimization goal,and completes the scheduling optimization of EV orderly charging.In order to verify the effectiveness of the optimization algorithm in this paper,simulation analysis and experimental research were carried out on a residential area and a pilot project respectively.The results show that the EV orderly charging optimization algorithm strategy in this paper can not only reduce the residents’ charging electricity expenses,but also play a certain role in shaving peaks and filling valleys on the distribution network load.Finally,on the basis of studying the adverse effects of EV large-scale access to disordered charging in residential areas on the distribution network,the area is expanded to the park area,considering the factors of comprehensive energy diversification and equipment,and formulating EV and various types of Operation strategy for flexible electric and heat load access to the park’s multi-energy system.Firstly,the mathematical models of various energy and load equipment in the park are established;secondly,the optimization objectives are established from two aspects of economy and energy saving,and the mixed integer linear model obtained is solved by the Yalmip toolbox in the Matlab platform,and the multi-energy information physics system of the park is used to complete the The whole process of information transmission,decision optimization,and instruction execution;finally,taking a park in the north as the research object,combined with the physical information system,an optimized operation strategy was formulated for it.Through the analysis of numerical examples,it can be seen that the optimal operation strategy of EV access multi-source system proposed in this paper can effectively reduce the economic cost of the system,reduce the carbon emission of the system,ensure the stable operation of the system while realizing multi-energy complementarity,and promote the consumption of renewable energy.