Discrete Time LQG Controller for Speed Control in a Steam Turbine Coupled to DC Generator

摘要

This paper proposes a discrete-time Linear Quadratic Gaussian controller (LQG) for speed control in a steam turbine coupled to a DC generator. The goal is to keep the speed constant despite the changes of pressure in the steam pipeline and the field resistance of DC generator. In the first part, the mathematical model that describes the dynamic behavior of a steam turbine coupled to a DC generator and their parameters are calculated using an optimization algorithm. In the second part, the discrete LQG controller is designed to eliminate the influence of the disturbance in the output signal. Finally, in the last part the controller was implemented on a distributed control system (DCS), called Delta V (Emerson), and tested for different set points.