Research On Synergistic Scheduling And Inter-grid Interactive Price Decision-making For Micro-energy Grid Group

The micro-energy grid group is an important form of large-scale utilization of renewable energy and an important way to promote the energy revolution strategy.How to give full play to the overall advantages of multi-grids interconnection is an urgent need for its development.With the differentiated development of different business entities in the micro-energy grid group,information barriers and paid for interaction demands have arisen between grids,which brings great difficulties to the collaborative management of the group.Taking into account the energy interaction between grids and the uncertainty of renewable energy,this paper studies the key issues affecting its sustainable operation and development,such as the synergistic operation of micro-energy grid group and inter-grid interactive price decision-making.The specific contents are as follows:(1)Characterize the output energy characteristics of each device in the micro-energy grid,including energy uncertainty,energy coupling and energy responsiveness,and then the main operation characteristics were described and summarized.The external interaction mechanism is described by establishing the power balance equations of various energy transmission channels and transmission directions inside and outside the network.(2)In order to realize the synergy of micro-energy grid group,under the framework of centralized management of all micro-energy grids entities by the group-level dispatching department,a synergistic operation optimization model of micro-energy grid group taking into account the energy interaction between grids and the uncertainties of renewable energy within the grid is constructed in this paper.Taking the minimum total operation cost of the group as the objective function and taking the safety,stable operation of equipment and various energy balances as constraints,a day-ahead and real-time two-stage stochastic optimization model for the synergistic operation of the group is built,so as to realize that the centralized scheduling of the micro-energy grid group synergistic operation and the stability of operation under the interference of energy uncertainty of each micro-energy grid.Finally,the solution process of the proposed model is summarized,and an energy management strategy to maximize the overall advantages of multi-grids interconnection and multi energy complementarity of the micro-energy grid group is obtained.(3)Due to the increasingly prominent differences among different micro-energy grids operators in the group,in order to ensure the synergy of the micro-energy grid group,under the framework of decentralized autonomy of each operator,this paper constructs an inter-grid interactive price decision-making model of the group that takes into account information barriers and paid interaction requirements.On the basis of the abovementioned micro-energy grid group synergistic operation optimization model,the objective function and constraints are scientifically decoupled to each entity to form the autonomous decision-making sub-model of each multi-micro energy grid,and the gradient projection algorithm is used to complete the final construction of the inter-grid interactive price decision-making model.Finally,in the form of price,the coordination between individual optimization of the multi-micro energy grid and overall optimization of the group is guided to realize the decentralized optimization of micro-energy grid group synergistic operation,and then the dynamic energy interaction price and interaction strategy between grids are obtained.(4)The simulation research is carried out on the above-mentioned micro-energy grid group synergistic operation optimization model and the inter-grid interactive price decision-making model to verify the feasibility and effectiveness of the model and solution method proposed in this paper.The results show that the cooperative interconnection of multiple micro-energy grids can achieve higher economic benefits,and the energy response of flexible resource equipment can ensure the stable operation of the group in the environment of energy uncertainty,which can provide theoretical basis and methodological support for the formulation of micro-energy grid group synergistic optimization strategy.In addition,the interactive price of energy between grids obtained in this paper based on decentralized coordination management can not only effectively guide each multi-micro energy grid to realize the synergy of micro-energy grid group operation,but also reasonably compensate the variable cost of energy suppliers,and realize a reasonable distribution of the overall economic benefits,which can provide reference for the design of the corresponding price decision-making mechanism for the synergistic operation of related interconnected energy systems.