Optimal Dispatch Of Community Integrated Energy System Under Energy Internet

On the systematic issue of harmonizing energy environment and development,it has become the consensus of countries to reform energy supply system and consumption mode,realize green and efficient energy supply structure,and diversify energy consumption.Integrated energy station(IES),based on the principle of energy cascade utilization,can provide multiple complementary services,promote the consumption of distributed renewable energy,improve energy efficiency,and promote the innovation of emerging business forms,business models and service modes,which is a great practice for the restructuring of energy industry structure.However,the different external environment,diversified internal composition,personalized service mode and differentiation of IES bring challenges to the application of basic theories.Opportunities and challenges coexist,the “comprehensive” characteristics make energy station an intersection of economics,environment,society,thermodynamics,electrical engineering and control engineering,creating space for the integrated development of theory and practice.Based on this,this paper takes a specific comprehensive energy station as the research object,and makes an in-depth analysis of its external environment,internal composition and operating conditions.Based on the information of specific energy stations,the energy supply structure is improved and the optimal operation strategy under the new structure is put forward.According to the characteristics of system uncertainty,conditional value at risk(CVa R)was introduced to establish day-ahead optimization model and model predictive control(MPC)to establish intraday optimal operation model.The applicability of relevant theories in multi-energy balance was analyzed.According to the transactional characteristics of power dispatching,a distributed agent cooperative optimization operation model based on transactive energy mode is established,which provides a specific case for the integration of theory and practice.Firstly,the external environment,internal composition and operation information of the IES are described.Then,the physical and mathematical models of the internal components are established and the energy flow analysis is carried out.On the basis of the above,typical daily load in summer and winter are taken as cases to simulate the existing operation strategy.Secondly,considering that the existing operation strategy could not adapt to the increased source uncertainty and market oriented interactive form,the energy supply structure was improved and the day-ahead multi-scene optimal operation strategy was proposed considering the economic cost and environmental cost.The results show that the system improved has more economic and environmental performance.On this basis,CVa R theory is introduced to explore the feasibility of CVa R as the economic risk of system uncertainty,and the reasons for the inapplicability of the theory are analyzed.Thirdly,in view of the randomness and volatility of renewable energy and multiple loads,based on the MPC,a multi-day time scale optimization operation strategy with rolling optimization and real-time adjustment is established.The results shows that the model proposed in this paper can reduce the source-charge uncertainty of the system and solve the time-scale difference of heterogeneous energy flows at a small cost.On this basis,the problems existing in the universal application of MPC in this paper are qualitatively analyzed.Finally,combined with the external environment of the research object,and stimulate the energy interaction of distributed market agents,a transactive energy architecture for distributed agents is designed based on analytical target cascading(ATC)theory.The results of the example show that this collaborative optimization method can maintain the optimal overall benefit and reduce the power “backflow” of distributed agents to the grid while achieving the diversity of benefit distribution among distributed agents.On this basis,a reasonable prospect is made for the flexibility of the ATC theory in the future application of transactive energy.