Combined Cooling,Heating And Power Micro-grid Optimization Scheduling

Because of advantages of high energy utilization rate,less environmental pollution and high flexibility,combined cooling,heating and power(CCHP)micro grid has drawn considerable research attention recently and has become the keynote of the second generation energy system technology.CCHP micro grid The fluctuations of cold and heat load in CCHP micro grid make the optimization scheduling more difficult,the system should have the ability of rapid response fluctuation and realize real-time optimal energy management.To carry on the fine micro grid load modeling,and improve the prediction precision of the renewable energy,it will be more suitable for micro grid fast scheduling.In this paper,we mainly study the optimal scheduling problem of CCHP micro grid.The contents of this paper are as follows:First,the thesis studies development of CCHP micro grid,established mathematical model of micro grid units and auxiliary equipment.Studied power generation and heating efficiency of gas turbine changes with the load rate,and unit capacity cost function of gas turbine.The output characteristic model of photovoltaic cell is studied and the KiBAM model of the battery is established.Second,the model with exogenous input of autoregressive moving average is used to predict the cold,heat,electric load and renewable energy.According to the predicted load demand,the multi-objective optimization scheduling of CCHP micro grid is made by the method of matrix modeling.In result,input energy and operation strategy of CCHP micro grid are received.Matrix model contains the efficiency matrix of system equipment,system transformation matrix and scheduling coefficient.Comprehensive consideration of primary energy consumption,total system cost and carbon dioxide emissions,evaluation index is established.According to the evaluation indexes,the multi-objective optimization scheduling model is established,which is based on the objective function to maximize the primary energy saving rate,the total system cost saving rate and the carbon dioxide emission reduction rate.Finally,considering the error of the prediction,the feedback regulation of CCHP micro grid is carried out.The established optimization model is optimized according to the latest forecast information.Then,the output of the system equipment is adjusted according to the very short term error,and the adjustment quantity is minimized by the feedback correction model.