A Dynamic Mathematical Model for Wide-Load Range Operation of Ultra-Supercritical Units

With the large-scale application of renewable energy in the power grid, the stability and security of the power grid are affected, which requires deep peaking of thermal power units represented by ultra-supercritical units. In order to better design the coordinated control system, which the unit can have better flexibility in peaking process, a dynamic mathematical model of ultra-supercritical units for wide-load range operation is established according to the unit operating data under wide-load range in this paper, the nonlinear regression analysis is used to identify the nonlinear function and static parameters in the model, and the dynamic parameters are obtained through a multi-objective optimization algorithm, which improves the model accuracy. Finally, by steady-state validation, dynamic verification and open-loop simulation, it is verified that the model has high accuracy and can reflect the basic characteristics of the unit.