Digital electropneumatic control system of Power Boiler processes. Process identification and motion optimization.

New approach for main stages of automatic controller tuning, process identification and controller parameters optimization, is proposed. It is based on methods of the three-stage estimation of a plant frequency response and on synthesis of a nonminimum phase transfer function using this response. For the above optimization, new criteria are introduced taking into account an influence of such processes non-linearities acted simultaneously as a backlash and a quantization with hysteresis. A proposed tuning procedure is illustrated by some examples of water level control systems at the IEC Power Boilers.