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Design of Fuzzy Flatness-Based Controller for a DC Drive

In this paper, a combined approach associating the flatness principle to the fuzzy logic control techniques is proposed and applied to a DC drive supplied by an AC―DC power converter. The basic of this control strategy consists in planning a reference trajectory using the flatness property of linear systems. The desired trajectory of the output process will be expressed by the flat output reference trajectory. After the planning step, the tracking of the reference trajectory is ensured by a PID-type fuzzy controller. The output static disturbance rejection, the tracking performances robustness under plant parameters variation and the limitation of the control signal magnitude applied to the system are improved. The hardware and software control requirements are respectively developed and the proposed control strategy is illustrated by experimental trials in real-time framework.