Optimal Dispatch of Combined Cooling, Heating and Power Microgrid Considering Thermal Characteristics of Heating Network

Abstract

In traditional optimal dispatch of combined cooling, heating and power (CCHP) microgrid, constraint on heat-power balance is considered, but neglecting thermal characteristics of heating network, which reduce the economy and practice value of the dispatching results. In this paper, thermal characteristics of heating network are modeled on the basis of transmission delay and temperature loss pertaining to pipelines. Then, a dispatch optimization model aiming to minimize daily operation costs of the CCHP microgrid is developed, in which constraints on load balance, equipment safety and thermal characteristics are considered. The optimization is a mixed integer non-linear programming problem that can be solved by GAMS. Simulation results demonstrate that the dispatching model proposed in this paper can fully exploit thermal storage capacity of heating network and change the profile of heat load, and thereby deliver more economical and practical dispatching solution. Therefore, thermal characteristics of heating network must be taken into account when dispatching a CCHP microgrid.