Optimal Planning Of Distributed CCHP System In Urban Energy Environment

With the adjustment of energy structure and the development of economy and society in China, distributed CCHP system is faced with the urgent needs of the market and the driving force of development. Yet from vigorously promoting the development of China's CCHP technology perspective, there is still no clear vision in some aspects such as the system's application objects, schemes, operational strategys, and performance both in efficiency and economy. The main work of this thesis is to carry out the system schemes and operational strategys optimization of CCHP system in China's urban energy environment, taking Beijing as an example, so as to answer the questions above.Firstly, cooling, heating and power load profile of market, hospital, hotel, office and university in Beijing is collected, and a mathematical model of operational strategy optimization is established. Secondly, by adopting the Sequential Quadratic Programming, the optimal operational strategy and scheme of CCHP system in the five buildings is computed. Then the character of energy efficiency, economic performance and operational strategy of gas turbine CCHP system and gas engine CCHP system is compared based on the results of optimization. The effect of storage in system is also discussed.Furthermore, the paper presented the analysis of certain factors that affect the optimization results, such as the Time-Of-Use pricing of electricity, the policy which decides whether the power generated by the system can be sold to grid, external cost internalization, and the price variety of gas, electricity, heating and cooling.The research results indicate that the computational method adopted is efficient. CCHP can be well adopted in buildings with high heat-to-power-ratio, basing on reasonable system configuration and operational strategy. Gas turbine and gas engine are applicable in different scope. The system can benefit from Time-Of-Use pricing of electricity and external cost internalization. And system economic performance is susceptible to gas and electricity price but not susceptible to heating and cooling price. All these work is expected to provide reference to the CCHP system development in China.