Research On The Planning And Operation Control Of User Side Integrated Energy System

The sustainable development of human society is facing several challenges,such as energy security,environmental pollution and climate change.Definitely,the key of the coping with the challenges is to speed up energy reforms and release large-scale utilization on clean energy.At present,the distributed generators(DGs)of wind,sunlight and other clean energy are with a rapid development,which aimed at optimizing the energy structure,and improving its efficiency.In wider sense,many countries have turned their attention to the integrated energy system(IES),which maily configured on the user side,and named user side integrated energy system(USIES).USIES is regarded as an integrated energy system,or as an integrated energy network conceived of the distributed energy interconnection.On the other hand,it can supply more energy to user considering constraints.This paper proposes to solve the problems of USIES including distributed energy model,energy station planning,optimal dispatching and evaluation planning.The main contents are divided into following items:Firstly,this paper analyzed the integrated energy system components form the perspective of users,and offered suggestions for integrated energy system structure;Secondly,the principles of integrated energy system are analyzedconsidering energy generation,transmission,utilization and recycling.Thirdly,on the basis of the structure and its operation,this paper summarized four typical models of integrated energy system.Finally,this paper analyzed the features of the integrated energy system under different modes.According to the present situation of the low utilization rate of energy,low rate of renewable energy development,serious environmental pollution,the separation of planning of distributed energy equipment and energy grids,the paper considered the randomness of the renewable energy power generation and electrical load.Based on heat-electrical integrated power flow,this paper presents a bi-level programming model of user side integrated energy system(USIES)from the perspective of economy,energy,and environmental protection.The optimal dispatching of controllable distributed energy is considered in the planning.The elitist strategy genetic algorithm and particle swarm optimization are applied for solving the planning model.The results show that the USIES planning considering heat-electrical power integrated power flow is more energy-saving,more environmental protection and more economic.The integrated energy system is seldom considered in the integrated energy system planning.On the perspective of the energy interconnection,optimal dispatching of distributed systems and multi energy flow,the paper has proposed the plan of energy system interconnection on the basis of two-tier planning.The elitist strategy genetic algorithm is employed to solve the upper model and branch&bound algorithm is applied to optimizing lower model that is a mixed integer linear programming problem.The simulation results indicate:the proposed planning method of energy internet is effective;multi energy flow interaction and multi energy router interconnection are more economic than traditional combined cooling heating and electricity and can alleviate the mismatch of heat-to-electricity ratio between gas turbine and loads;multi energy networks by which distributed energy system are interconnected contributes to higher economic benefits than single electric or heating network.In the background of separation of distribution and sale of electricity and aiming at maximizing the interests of Energy Service Company(ESCO),an interval linear programming model is built to get day-ahead optimal dispatching of multiple ICESs,in which the objective function and the decision variables are represented by appropriate interval numbers.The aspects including multi-energy interaction,network constraints,environmental benefit and time-of-use(TOU)price are together considered in the above model which is solved via enhanced interval linear programming(EILP)and commercial software Cplex.Simulation results show that under the background of multiple ESCOs taking part in transaction,the interconnection of multiple ESCOs with distribution network can increase the total profit of the ESCO;the optimal solution in the form of the interval can provide more options for decision makers,and reflect the effects of uncertainty factors on the profit of ESCO more actually.Aiming at the current situation that evaluation of USIES not comprehensive,this paper mainly focused on the evaluation index system and comprehensive evaluation method of USIES.From the perspective of energy efficiency,economic performance,operational characteristics and environmental protection,the paper puts forward a comprehensive evaluation index system of USIES.Generally,on the combination of analytic hierarchy process,the paper adopted the methods of entropy weight and cluster analysis.The simulation results show that the proposed index system can comprehensively,systematically quantify,analyze and evaluate.The proposed comprehensive evaluation method can achieve the optimal choice of the scheme,thus providing a theoretical basis for planning and operation scheduling personnel.