**3. System Description**

The structure of the CCHP multi-microgrid system combined with ESS is shown in Figure 1. In this study, the number of the CCHP microgrid is three. Considering the relevant policy restrictions and technical demands, the CCHP system is stipulated not to sell electricity to the grid. The system can be divided into power supply equipment, heating equipment, and cooling equipment. Among them, the power supply equipment includes photovoltaic generator unit (PV), micro turbine (MT), and energy storage station (ESS). Heating equipment includes gas boiler (GB), heat recovery (HR), heat exchanger (HE), and thermal storage tank (TST). Cooling equipment includes electric chiller (EC) and absorption chiller (AC). The mathematical model of the main equipment of the system is described below.

**Figure 1.** The structure of the CCHP multi-microgrid system combined with ESS.
