The Design of Thermal Generating Unit Controller Based On New Energy Balance

Firstly, the limitation of using simplified model to design thermal generating unit controller is discussed. For the simplified model, the dynamic of the synchronous generator is neglected, and thus it is not valid in the emergency state of power systems. Secondly, the integral model of thermal generating unit is constructed, which consists of the models of boiler, turbine and synchronous generator. Compared with the simplified model, the integral model can accurately describe the rotor storage characteristic of thermal generating unit. Thirdly, a new energy balance controller is designed based on the constructed integral model. In the new controller the derivative of rotor speed is feed-forwarded, and thus the controller can respond to the energy imbalance more quickly, and the dynamic of steam pressure can be enhanced obviously. Finally, the simulation results also demonstrate the validity of the proposed controller.