Research On Multi-energy Complementary Control Of Integrated Energy System Based On Multi-objective Optimization

With the increasing material and cultural needs of the people,the diversification of energy demand has gradually become the goal of human production and life.The non-renewable and single fossil energy in the traditional sense is no longer suitable for the current development and will eventually be exhausted.Pursuing more new-type energy development,strengthening the utilization of a variety of energy and improving the utilization rate of a variety of energy are effective ways in line with the current social sustainable development strategic goals,which can not only effectively solve the contradiction between environmental damage and development,but also alleviate the problem of energy supply and demand balance.The energy supply of the whole load building is mainly based on coal,the energy consumption structure is unreasonable,the energy utilization rate is low,and the carbon pollutants discharge is high.It is not in line with the goals of carbon peaking and carbon neutrality.Therefore,it is an effective way to realize the long-term development of human society to re-plan various independently planned and operated energy systems and form a complete,integrated and mutually cooperative green and efficient energy supply system,which is conducive to the collaborative optimization of various energy sources and the strengthening of the stability,efficiency,energy saving and environmental protection of the system.Therefore,an optimization operation and control model considering regional electric cooling,hot and gas integrated energy system is proposed.Under this background,simulation control and optimization analysis are carried out based on the characteristics and characteristics of each subsystem coupling operation.(1)Firstly,the topology diagram of the overall comprehensive energy system is drawn up in this paper,and the principles of each molecular system,including power system,thermal system,cold force system and load energy supply circulation system,are introduced.At the same time,the basic models of electric-cooling coupling link,electric-heating coupling link,electrical coupling link and related energy equipment are established.(2)Secondly,in order to satisfy the comfort,flexibility and economy of the system,the coordinated control strategy of the integrated energy system is studied,and the hybrid control of temperature difference control,fuzzy control,neural network control and constant frequency and constant voltage control is introduced into the system,and the simulation model of the integrated energy system under the coordinated control strategy is established.Through TRNSYS and MATLAB simulation,the indoor temperature fluctuation is low and the comfort is high under the correlation strategy.The power of the equipment and the COP of the system have good economy and strong performance in frequency conversion operation according to the control signal;System power supply sufficient power balance.It solves the characteristics of large energy consumption and strong volatility of traditional energy supply system.(3)Finally,the comprehensive energy multi-energy complementary system is optimized and calculated.With the minimum total system cost as the goal,the system equipment and coupling unit constraints are combined.At the same time,the carbon trading mechanism is introduced to ensure environmental protection.In the thermal system network,the improved linearization Newton Lafson method for heat supply and return system is proposed,and the Newton inverse calculation method improved by second-order cone relaxation is proposed for natural gas network.Then,mixed integer linear programming is used to optimize the solution of some energy supply equipment.Using multiple methods to solve the problem can effectively solve the independent influence between different coupling systems and realize the iterative solution between different systems.The feasibility and effectiveness of the same algorithm in different scenarios are analyzed through simulation verification,which has reference significance for energy management and decision of future integrated energy system.