Research On Microgrid Coordination And Optimal Dispatch Method Considering Real-time Electricity Price

At this stage,my country’s economy is developing rapidly,people’s living standards are constantly improving,and the demand for electricity is increasing.As traditional energy shortages and environmental pollution problems become more and more prominent,the mining of renewable energy and the operation and dispatch of microgrid systems and demand response have become Research hotspots at home and abroad.Real-time electricity price mechanism is a power-price response strategy in the demand response,which can guide the demand-side users in the micro-grid to adjust their power consumption behavior and stimulate flexible load characteristics.It is of great importance to improve the economy of micro-grid operation.With the development of smart grid technology,the number of micro-grids in the distribution region is gradually increasing.Therefore,it is necessary to study the regional multi-micro grid coordination and optimization method to coordinate the efficient,safe,economical and reliable operation of each sub-micro grid and reduce the pressure of distribution network coordination and dispatch.Based on the load curve after demand response,this paper proposes a microgrid coordinated and optimized dispatch method for adjusting dynamic real-time electricity prices,and compares the economics of different operating modes of microgrids under the mechanism of time-of-use electricity prices and dynamic real-time electricity prices.First,the wind and solar power model,the battery energy storage model and the washing machine load model are analyzed and put forward,and the shiftable load characteristics of the inverter air conditioner in the long-term scale are studied.The minute-level air-conditioning model is converted into the hour-level time-scale model,which is convenient Optimize dispatch under real-time electricity price as the theoretical support of microgrid equipment model.According to the electricity price demand theory and the mutual restriction relationship among the electricity supply,electricity price and user demand,this paper proposes a two-layer coordinated scheduling model of micro-grid.Inner model is based on the fixed spot price,combined with the scenery output,energy storage device and can be adjustable properties of shift load,establish the meter and real-time electricity source of micro network storage optimization scheduling model,the outer model is based on the micro network real-time electricity price model,to reduce the peak valley load difference,reducing the peak load curve as the goal,puts forward the optimized model of dynamic real-time electricity price.The simulation results of the four scenarios show that the coordinated optimization strategy of micro grid under the optimized dynamic real-time electricity price has a more obvious effect on reducing the peak load of the power grid.Finally,this paper makes a comparative study on the benefits of multi-micro grid cooperation and non-cooperation under the background of TOU electricity price and dynamic real-time electricity price.Aiming at multiple microgrids in a certain distribution area,a game model between microgrids is established based on the cooperative game theory,and the interests of each microgrid participating in the alliance are distributed according to the Shapley value method.Analyze and compare the influence of different scale alliances formed between multiple microgrids on the optimized operation of microgrids.The simulation results show that the cost of the microgrid after cooperation is lower than the electricity cost paid when independently transacting with the distribution network.The benefits of microgrid cooperation in the context of dynamic real-time electricity prices are more obvious than microgrid cooperation in the context of time-of-use electricity prices.