Research On Coordinated Planning And Optimized Operation Method Of Regional Comprehensive Energy System

With the global energy crisis and environmental pollution becoming more and more serious,the energy industry is actively exploring new ways to improve the proportion of clean energy and energy efficiency.Under this background,the integrated energy system,which covers many energy fields,such as electricity,heat,cold and gas,can break the isolation among energy subsystems and realize the cascade utilization of energy and improve the consumption capacity of clean energy.Therefore,the integrated energy system has attracted wide attention of energy industry.However,the integrated energy system is coupled with wind,light,heat,gas and other energy sources.There are great challeges in its joint and complementary dispatching operation,which is an urgent problem to be solved at present.Basically,this dissertation focuses on the key technical issues of integrated energy system planning,optimization and engineering practice,including system thermoelectric energy management,active distribution network collaborative optimization,regional integrated energy system planning and active distribution network design.The specific research work of this dissertation is as follows:(1)Research on collaborative optimization for active distribution network planning-operation considering battery lifeAn active distribution network planning-operation collaborative optimization model considering the lifespan of ESS is proposed.This model models the lifespan factor of energy storage in ADN and ESS planning problems.Through piecewise linearization,the model is reconstructed into a mixed integer linear programming model.Considering the ESS life factor increases the complexity of the planning problem,Benders decomposition is introduced to improve the convergence speed.Finally,the proposed planning-operation collaborative optimization model was simulated and verified by a numerical example.(2)Research on optimization planning of integrated energy system with CCHPThis paper proposes a comprehensive energy system planning model for power and natural gas based on the combined heating and cooling system.The constructed model considers the planning and operation of distribution lines and gas pipelines,and uses CCHP as an electric-gas coupling hub.It takes multi-stage planning and multi-scenario analysis as the optimization goals of the total investment of the regional comprehensive energy system and the lowest operating cost.Through numerical simulation,the expansion and new construction of distribution lines and gas pipelines and the location and capacity of CCHP were obtained.The results verified the rationality of the model.In addition,through comparative analysis with traditional distribution systems,the system using CCHP as an energy coupling hub shows better economy.(3)Research on thermoelectric energy management of regional integrated energy system based on adaptive consensus algorithmAiming at the problem of RIES distributed thermoelectric energy management in island mode,a thermoelectric energy management method of regional integrated energy system based on adaptive consensus algorithm is proposed.This method considers the tight coupling characteristics between the energy sources and thermal-electric energy balance constraints.Based on the unified negotiation and independent negotiation consistency of dynamic energy mismatch,the feasible region of the combined heat and power unit is decomposed into eight search sub-regions,and its electrical energy and thermal energy output can simultaneously meet the incremental cost consistency requirements and thermoelectric balance constraints.An example is used to verify the rationality and effectiveness of the proposed regional integrated energy system thermoelectric energy management strategy.(4)Research on stochastic MPC optimal scheduling model of cogeneration microgrid considering flexibility constraintsIn order to smooth the fluctuations of renewable energy and load in grid?connected microgrids,a multi-scenario stochastic programming and model predictive control(MPC)model for optimal scheduling of combined heat and power microgrids is proposed,and energy coupling equipment is considered Operational flexibility index of climbing ability.And the mixed integer linear programming(MILP)is used to solve the scheduling problem.An example is given to verify the proposed optimal scheduling strategy.(5)Design and demonstration of active distribution network for supporting urban energy InternetBased on the above theoretical research,combined with the needs of Suzhou distribution network construction,five innovative demonstration projects such as AC-DC hybrid active distribution network were carried out,and an active distribution network source with high reliable power supply and high-quality power quality supply was proposed.The technical solution of coordinated control of net load(storage)provides support for the development of Suzhou City's energy internet and international energy reform.Make full use of the planning and operation model of theoretical research,improve the variety of adjustable resources in the Suzhou distribution network,realize the coordinated control and friendly interaction of photovoltaic,wind power,distributed energy storage,electric vehicles,and flexible loads,and improve the acceptance of distributed power Capacity,regional source-charge balance level and comprehensive utilization efficiency of energy lay the foundation and support for the development of the Suzhou City Energy Internet.