Research On Multi-energy Joint Optimal Operation Control Strategy Of Microgrid

Energy industry is the basic industry of national economy.Energy is not only the prerequisite to ensure national strategic security,but also the necessary guarantee to achieve sustainable economic development.Microgrid is the complement and development of traditional grid.Microgrid contains renewable energy such as photovoltaic,wind turbine and so on.Once proposed,it has attracted wide attention from all over the world.In this paper,along the idea of planning and dispatching,the optimal control of microgrid with multiple distributed energy sources,energy storage devices and EV is studied.The main contents of this paper are as follows:This paper first introduces the research background and significance of microgrid,summarizes the research status of microgrid at home and abroad,as well as the status quo of multi-energy coordination and optimization operation of microgrid,and analyses the working principle of microgrid.On this basis,the working principles and operating characteristics of photovoltaic power generation,fan power generation,micro-turbine power generation,fuel cell power generation and battery charging and discharging are analyzed,and the corresponding mathematical model is established.The EV trip characteristics are analyzed and its mathematical model is established.Secondly,the paper studies the planning of microgrid with multiple micropower sources,and establishes the optimal control model of microgrid multi-energy system with photovoltaic,fan,micro-gas engine,fuel cell,battery and EV.In order to reduce the load fluctuation and minimize the integrated operation cost of the microgrid,the constraints for the safe operation of the microgrid multi-energy system are given.The weight coefficient is introduced to turn the multi-objective optimization problem into a single-objective optimization problem.The dynamic programming algorithm is used to solve the optimization model.And a day-ahead optimal dispatching strategy for the microgrid multi-energy system is proposed.Finally,three different scenarios are set up.The optimization program is written in MATLAB software to simulate the single-objective optimization model and the multi-objective optimization model respectively.The optimization results under three different scenarios of single-objective optimization and multi-objective optimization are compared,and the optimal dispatching schemes of each distributed generation in the system are given.The simulation results show that the optimized system can effectively achieve peak shaving and valley filling,and improve the stability of the system.The accuracy and validity of the model proposed in this paper are verified.