The integrated energy system able to realize optimal utilization of all kinds of energy and effectively solve the problem of environment pollution and energy waste has good development prospects. The planning of a multi-district integrated energy system based on the synthesis of combined cooling

heating and power(CCHP)and heating network is mainly studied. First

a model of ring heating network between the CCHP systems is developed with the node flow balance

heat-flow constraint and heat loss constraint taken into account. By considering energy balance constraints and the network model

a mixed integer linear programming model for collaborative optimization configuration of multi-district CCHP is established. Finally

simulation analysis is conducted at a comprehensive area in Tianjin. The results suggest that the cooperative planning and operation of multi-district CCHP can greatly improve the operating factor of gas turbine

reduce the capacity of gas boiler

minimize the heat loss during transmission

and thus significantly reduce the operating cost. This work is supported by National Key Technologies R&D Program(No. 2015BAA01B01)

National Natural Science Foundation of China(No. 51277027)and State Grid Corporation of China.