Research On Optimized Scheduling Of Multi-Sources District Heating System

Environmental pollution and energy consume increasingly becomes serious gradually.It’s time to propel the progress of multi-sources district heating system.Multi-sources district heating system can complement each advantages of different heat sources,thus improving the efficiency of the whole system.A scheduling optimization model is built for a multi-sources district heating system,and the NSGA-II algorithm and TOPSIS analysis method are used to get the solution of the multi-objective model.(1)The principles to be followed in system design and the priority of heat source load distribution are given by analyzing the peaking mode and common parameters of the system.(2)A scheduling optimization model is proposed for that multi-sources district heating system,and the objective function establishment method for different heat sources in operating cost,primary energy ratio and integrated pollutant emissions is given.The load of heat sources and delivery capacity of heating network is taken as constraints.Meanwhile,the NSGA-II algorithm and TOPSIS analysis method are used to solve the scheduling optimization model.(3)The rationality of the scheduling optimization model and the feasibility of the algorithm are analyzed by an example of a district heating system in Beijing.The results show that gas-fired thermal power plant operates at the beginning and the end of the heating season.During the cold period,multiple heat sources are connected to the grid,and second-class absorption heat pump system has priority over the gas-fired boiler.(4)The effects of regulation mode and accident conditions on optimization scheduling of multi-sources district heating system are analyzed.And the operation regulation of multi-sources systems with different heat-medium parameters is analyzed,which paves the way for the study of scheduling optimization problems of multi-sources systems with different heat-medium parameters.