Research On Micro Grid Modeling And Economic Operation Optimization With CCHP System And Energy Storage

In recent years,with the continuous reduction of fossil energy,countries all over the world are committed to developing the use of clean energy,wind,solar,tidal,natural gas and other clean energy gradually began to replace fossil energy.Among them,Combined Cooling Heating and Power(CCHP)system has certain advantages in saving energy and reducing pollutant emission.CCHP system uses natural gas as the main energy source and integrates refrigeration,heating and power generation.With its high energy utilization efficiency,flexible energy supply mode and low construction cost,it has gradually become one of the important means to achieve energy transformation.Therefore,this paper chooses the cold,heat and electricity combined supply system including natural gas network and electrical network two network modules to study,on the basis of ensuring the stable operation of the system,to establish a cold,heat and electricity combined supply system with economy as the primary goal.The main contents include the following aspects:(1)Considering the characteristics of THE CCHP system,the particle swarm optimization algorithm is improved in view of the disadvantages of the traditional particle swarm optimization algorithm,such as poor stability and easy to fall into local optimization.Based on adding external collection method,this algorithm makes the modified particle swarm optimization(pso)algorithm can meet the requirement of real-time scheduling CCHP system,and aims at with CCHP system,the objective function is minimum operation cost,improved particle swarm algorithm can according to system parameters change automatically search for the optimal allocation,to achieve the requirement of the system efficiency.(2)According to the characteristics of complex and changeable internal energy flow in CCHP combined power supply system,the electrical module of CCHP combined power supply microgrid is constructed,the energy flow model of microgrid equipment is given,and the internal energy flow characteristics of CCHP combined power supply microgrid are analyzed,and the energy balance equation is used to describe.(3)In view of the characteristics of natural gas,which is the clean energy chosen by the traditional combined cooling,heating and electricity supply microgrid,the transmission speed is slow and the transmission distance is long,so the system is prone to the problem that the natural gas network cannot absorb the fluctuations of the electrical network in time.In this paper,the natural gas network is modeled and simplified,and the relationship model between the natural gas network and the power system is established.The fluctuation reflected in the electrical network is transferred to the natural gas network for regulation and control,so as to ensure the stable operation of the system.Finally,after establishing a complete system model,the system model is simulated and analyzed to observe the system’s ability to absorb load changes in a day,and the difference between stability and optimization ability of the system when using traditional particle swarm optimization algorithm and improved particle swarm optimization algorithm.The cost comparison between traditional grid generation and CCHP system is carried out to calculate the simple investment recovery life of CCHP system.Finally,the simulation results show that the system has good advantages.