Combined cooling, heating and power (CCHP) systems are regarded as efficient, reliable and environmentally technologies for energy utilization. Besides, smart grid is an intelligent electricity delivering system brings benefits to utilities and consumers as well as improves the energy efficiency and reliability on the grid. The combination of the two provides a promising energy solution for future distributed energy system. An optimization method was proposed for design and operation of CCHP systems towards a smart grid. The program can optimize the sizing of components, hourly demand of biogas and electricity from grid. So the program serves the smart grid from demand side response. A sewage treatment plant (STP) in Hong Kong was selected for the case study as it needs simultaneous heating, cooling and power with selfgenerated biogas. The simulation was conducted under different sizing criteria and biogas prices.The CCHP system can avoid the dependency on utility if the peak-load-sizing is adopted. For STP, it is more economically attractive to adopt a larger system. The optimized strategy shows the CHP should operate longer at full load when the biogas price is cheaper and operate at part load only to satisfy the heating load when the biogas is expensive.
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