Controller Design for Integrating Processes in Siso or Mimo Systems

A two-step design t o control integrator processes in an SISO or MIMO system is proposed. For an SISO system, the first step of the design is to stabilize the integrator process with P&D modes in a secondary loop to achieve good stability robustness and modest performance. In the second step of design, a P&I controller in the primary loop is derived to improve the overall performance. By this way, an equivalent two-element control system comprising of a single PID control loop and a pre-filter applying on the set-point command is derived. T he same design approach is then applied to design multiloop SISO controllers for MIMO processes , where integrating behavior exists. By employing the same two-step design and the direct method of Huang et al. (2003), 2-df multi-loop PI/PID controllers can be obtained. The Simulation results show that this presented method is effective for both SISO and MIMO process with integrators. Copyright © 2003 IFAC