With the improvement of district heating in the field of thermal energy engineering

there is an urgent demand for thermoelectric decoupling of cogeneration units. This paper investigates the characteristics of thermoelectric units from the aspect of thermoelectric decoupling. Based on the modular modeling method

the steady-state modeling and simulation software for the thermal power plant system is developed. The developed software includes generalized general-purpose component modules for common equipment of the thermal system. In addition

it uses the design of flow module to construct the topological structure of the actual thermal system and can carry out the generalized modeling for various thermal power plants. Based on the software

the thermoelectric coupling relationship of cogeneration units with multiple extraction steam schemes is studied. The modeling and validation of the design conditions are carried out based on the design conditions of a demo plant. With the validated models

this study carries out thermoelectric decoupling based on extended working conditions. The simulation results show that

cogeneration units with multiple extraction steam schemes can achieve thermoelectric decoupling even under constant load via different combinations of heating and steam extraction schemes. It also reduces the loss caused by varying loads of units through the adjustment of the thermoelectric relationship of the plant.