Dispatch model for integrated heat and power systems considering internal composition of CHP plants

Abstract

An integrated heat and power system (IHPS) is a promising approach for alleviating wind curtailment problems. In an IHPS, the combined heat and power (CHP) plant is the key component, which supplies both heat and electric loads, and couples the thermal system and power system. However, existing research commonly ignores or simplifies the internal composition of CHP plants, which could lead to some unavoidable errors. This paper focuses on the internal composition of CHP plants, and models the physical processes in different components and flexible resources in the CHP plant. Furthermore, a joint dispatch problem of an IHPS with the above CHP plant models is formulated, and an iterative algorithm is developed to handle the nonlinearity in this problem. Case studies are performed based on a real CHP plant in Northern China, and the results indicate that the synergistic effect of different energy resources in the CHP plant is realized by the joint dispatch model, which promotes wind power accommodation and reduces fossil fuel consumption.