Application of feedback linearization in boiler-turbine systems

To improve tracking and disturbance rejection properties, the input state and input output feedback linearization methods are used to design the control laws of a boiler turbine system. For the input state linearization method, the states are related linearly to the inputs, so the system can operate well over a wide region. The zero dynamics of the system are verified to be stable for input output linearization method. However, computer simulations show that the stable region of zero dynamics is small, so the input output linearization controller can only operate in the neighborhood of operating point. Some comparisons and analyses between input state and input output feedback linearization are given based on above results. The computer simulations show that the input state linearization controller has good tracking and disturbance rejection properties.