Digital electropneumatic control system of power boiler processes. Process identification and motion optimization

A new approach for the 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 process nonlinearities acting 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.