Distributed Optimal Dispatching Of Interdependent Electricity-Natural Gas Energy Systems

With the rapid development of new energy technology and renewable energy industry,all kinds of new energy are connected to the grid at an accelerated speed.The adjustment of energy structure makes the energy system revolution of intergenerational upgrading.As an important part of the energy Internet,the integrated energy system of electricity gas interconnection is a multi-energy couple composed of various energy forms such as electricity as the main body and natural gas,which can be realized.All kinds of energy are mutually beneficial and complementary,promoting the consumption and absorption of renewable energy,and effectively improving the utilization efficiency of comprehensive energy.At the same time,the gradual maturity of the electricity to gas technology(P2G)further promotes the coupling between the power network and the natural gas network in the integrated energy system,and strengthens the energy interaction within the interconnected system.Under the condition of relatively independent dispatching operation of the two networks,how to promote the optimal coupling of the integrated energy system of electricity gas interconnection and further improve the energy utilization efficiency becomes very importantThis paper mainly studies the model and algorithm of the optimal scheduling of the power-gas interconnected comprehensive energy system,and then optimizes the scheduling operation of the power-gas interconnected system.Firstly,this paper analyzes the framework structure,the nature of each sub-energy system,the operation mechanism and the complementary mechanism of the comprehensive electric interconnection energy system,and establishes the mathematical model of the power-gas interconnected comprehensive energy systemSecondly,according to the objective function of the integrated energy system and the constraints of the system operation,according to the principle of alternating direction multiplier method(ADMM)in the field of distributed optimization,combined with the daily dispatching optimization model of the electric pneumatic energy system,taking full account of the interaction between the power system and the natural gas system,coordinating the optimal operation of the power grid and the gas network,the distribution of the electric gas interconnected system is built.In this framework,the coordinated control of electricity and gas energy is realized by alternating iteration between grid and gas grid,and the optimal distribution of power energy flow and natural gas energy flow is finally achievedFinally,this paper establishes the optimal energy flow model of electrical interconnection considering the dynamic transmission process of natural gas,and proposes a convex decentralized optimization algorithm:PCCP-ADMM algorithm.In order to achieve the decentralized optimization of electric interconnection network and obtain high-quality solutions,simulation analysis is carried out to modify the interconnection system model of IEEE 39-node power network and Belgium 20-node natural gas network.Compared with the optimization results under different predict parameters,and the centralized optimization method,the results are analyzed in terms of accuracy and speed.The results show the effectiveness of the proposed algorithm.