Research On Optimal Operation Methods Of Microgrid System With Renewable Energy

In recent years,Renewable energy power generation technology of our country has developed rapidly.Large-scale use of renewable energy to replace traditional fossil energy to complete power generation tasks has eased the energy crisis to a certain extent.However,with the continuous increase of the renewable energy penetration rate,its inherent intermittentness and uncertainty have brought major challenges to the operation and dispatch of the power grid,which is a current renewable energy power generation technology problem that must be solved.Microgrid system,as a key technical solution to realize the connection of renewable energy,can effectively complete the task of peak load and valley filling of user loads,and at the same time restrain the fluctuation of renewable energy output,which will greatly help the security and economic operation of the grid.Microgrid system research is a research area covering many directions.Research on optimal operation methods of microgrid system is an important part of it.Establishing appropriate optimal operation methods of microgrid system can further ensure system security and stability,and improve system operation economics.Very significant research significance.In this paper,by studying and analyzing the characteristics of the microgrid system and the operating characteristics of the equipment in the system,the mathematical model is established to realize the abstraction and modeling of the microgrid system,which facilitates the analysis and simulation of the system.Secondly,this paper conducts a separate study on the energy storage system in the microgrid system,lists the benefits and costs during the energy storage operation,establishes a battery loss model during the energy storage operation,and uses the operation of the energy storage system.The best benefit is the optimization goal.An economically optimal operation method for the energy storage system is established,which optimizes the operation mode of the energy storage,and quantitatively analyzes the losses during the energy storage operation.Finally,a multi-time scale micro-grid optimal operation method is established in this paper,and short-term and ultra-short-term prediction models and methods of load and renewable energy are given.During the day-ahead optimization scheduling phase,a microgrid running optimization model was constructed in both grid-connected and off-grid states.The improved particle swarm algorithm was used to perform simulation optimization calculations.Through calculation,the result shows the operating effect under grid-connected state and its internal components is significantly better than the off-grid state,and its economy and operating status are also better.During the day rolling optimization scheduling stage,a day rolling adjustment scheduling method for the grid-connected microgrid system was constructed,and related optimization models were established and solved.The results show that the total amount of micro-grid optimization adjustments within the day is small,the output curve after adjustment is less changed than the previous curve,At the mean time,the level of adjustment costs is not high,which manifest the economy of microgrid system is good.Therefore,the scale optimization methods proposed in this paper has been proved good practicality.