Dispatch Model for Combined Heat and Power Systems under Variable Flow Control Strategy

The combined heat and power system under variable flow control strategy has flexible supply heat regulation performance. However, the no n-convex and non-linear energy flow model of the heating network in this mode brings a huge challenge to the solution of the system scheduling model. To address this problem, a linear heating network energy flow model is first derived based on the assumption that the heating temperatures at load nodes are very small differences. Then, a first-order thermal load model considering the equivalent load generated by the fresh air system and the thermal inertia of the building is established according to the heat conduction process of the building and Fourier's law. Finally, a joint dispatch model for combined heat and power systems under variable flow control strategy is established. The validity of the model is verified by a 6-bus electric power system (EPS) and 6-node district heating network (DHN).