Multi Energy Power Flow Calculation Of Electricity-Gas-Heat-Cooling Integrated Energy System

In the process of energy development and evolution,the traditional energy systems will be independent of each other.Electricity,gas,heat,cold and other systems are managed and operated in a decentralized way,without coupling and interaction.This practice will make the energy structure unable to be reasonably optimized,and even cause energy waste.On the basis of building a comprehensive energy platform,using the coupling system or coupling module to organically combine the independent operation of electricity,gas,heat and cold systems and distributed generation,energy storage and other links,to optimize the distribution and reasonable operation of energy structure,which can effectively improve the utilization rate of wind energy,solar energy,electric energy,heat energy,cold energy,tidal energy and other multiple energy categories In order to realize the reasonable distribution and operation of energy in the region.Based on the independent operation characteristics of each subsystem,considering the operation characteristics of the coupling links between subsystems,different operation modes of the system and the operation characteristics of the coupled system,the modeling simulation and power flow calculation are carried out.The main contents of this paper are as follows(1)This paper analyzes the basic modeling of energy links such as photovoltaic power generation module,wind power generation unit,natural gas pipeline network,thermal system,cooling system,etc.under the multi energy power flow mode of integrated energy system,and analyzes the characteristics of each independent operation mode of integrated energy system.(2)The coupling characteristics of integrated energy system are studied and the simulation model is established.In order to express the coupling characteristics of the integrated energy system,the electric gas coupling link composed of micro gas turbine,gas boiler and P2 G equipment,the electric thermal coupling link composed of P2 H equipment and waste heat boiler,the electric cold coupling link including compression refrigeration unit and the heat cold coupling link including absorption refrigeration unit are established.For the system characteristics of the electric gas coupling link,a micro gas turbine simulation model is set up,which integrates the power flow characteristics of the power system and the constraints of the natural gas pipeline network.Through the analysis of the simulation results,the energy relationship between the electric gas input and the electric heat output of the micro gas turbine is obtained,and the influence,restriction and distribution of the coupling link on the subsystem are verified.(3)The multi energy power flow calculation of integrated energy system is analyzed.The characteristics of power,gas,heat and cold multi energy power flow of regional integrated energy system are analyzed.According to the characteristics of power network,natural gas network,thermal system and cold power system,the multi energy power flow model of integrated energy system is established,and the CCHP unit power flow model based on Simulink is built.Aiming at the calculation method of multi energy power flow,based on the existing algorithm,a Newton backstepping method is proposed to solve the steady-state power flow of natural gas network.For two different power flow calculation modes of integrated energy system(FEL)and FTL,this paper studies the coupling characteristics of each system and the influence of coupling links on different independent energy operation systems as well as the feedback effect,solves the problem of solving the multi energy power flow model of integrated energy system,and realizes the alternating iteration of integrated energy multi energy power flow Solution.(4)Taking the 43 node integrated energy system as an example,the improved Power World A 37 node example and a comprehensive energy project in a demonstration area of Tianjin are taken as examples to calculate the multi energy power flow of the power gas heat cold integrated energy system.The multi energy power flow parameters of each subsystem after coupling operation and the specific calculation parameters of CCHP unit coupling link under different operation modes are obtained.Compared with the data of traditional single energy supply mode,it shows the coordinated operation of multiple energy systems The rationality and efficiency of power supply for users’ loads verify the effectiveness and feasibility of the power flow model and multi energy power flow calculation method designed in this paper.Matlab software is used for the simulation analysis of the example in this paper.