Implementation of an industrial LQG self-tuning controller for power system applications

The design and construction of a self-tuning controller software package intended for use on a main boiler feed pump speed control subloop in a power station application are described. An indirect self-tuning regulator is implemented with a linear quadratic Gaussian (LQG) control law and a prediction error parameter estimation algorithm. The control law is derived using a polynomial equation approach. The software design is modular, avoids the use of global variables, and includes provision for plant protection. Experimental results demonstrate both the functionality and practicality of the device, and its fail-safe software mechanisms