Study On The Configuration And Operation Optimization Of Combined Cooling, Heating And Power Coupling Multiple Energy System

The combined cooling,heating and power(CCHP)system is an highly efficient way of energy utilization,which can achieve cascade utilization of energy and has broad application prospects.However,the CCHP system contains many kinds of equipment in complex form,needs to meet the demand for cold,heat and electric loads which keeps changing and has to consider the combination with a variety of renewable energy sources,these factors bring difficulties to the design of the CCHP system.To solve the problems,this paper studied the configuration and operation optimization of the multi-energy coupling system which includes CCHP,ground source heat pump and photovoltaic system and established optimal configuration and operation relational model of the multi-energy coupling system based on the construction method of double layer model.And a method based on sequential control configuration,sequence quadratic programming algorithm and feedback correction mechanism was proposed to solve the optimization model.MATLAB programming was used to realize the whole process from modeling to solving.Finally,an optimization tool for CCHP coupling multiple energy system was developed based on optimization model and solution method.The optimization tool can determine the real-time optimization operation strategy according to the hourly load demand.A business district in Tianjin was selected as a specific case.The optimal configuration scheme and the corresponding optimal operation strategy for regional energy supply were obtained by using the optimization model.Compared with the traditional system,the optimal system can reduce the total operation cost by 36.2%,of which the incremental payback period of investment is about 5 years.The economic benefit of the optimal system is remarkable,which confirms the practicality of the optimization model.Finally,the influence of electricity and gas prices on the system optimization was studied.It is concluded that the power supply of the optimal system is directly and inversely proportional to the price of electricity and gas,respectively.And if the optimal configuration is fixed,the incremental investment recovery period of the optimal system is directly and inversely proportional to the price of gas and electricity,respectively.This paper provides a method for the design optimization of CCHP coupling multiple energy system and a new idea for solving similar optimization problems,which has reference value.