How to auto-tune PID parameters for isolated converters like a phase-shift full-bridge DC-DC converter?

I want to auto-tune the PID controller for an isolated DC-DC converter, specifically a phase-shift full-bridge (PSFB) topology. The goal is to automatically determine the optimal PID parameters (Kp, Ki, Kd) for voltage or current control loop using simulation tools like MATLAB/Simulink or real-time data.

Answer 1

[Sam Chak]

Generally, you desire a 'smart' program that autotunes the PID controller without requiring the user to specify the desired performance requirements. The program should at least stabilize the system with the commonly desired phase margin of 60°. If that is the case, the Control System Toolbox has a useful function called pidtune().

help pidtune

--- help for DynamicSystem/pidtune ---

 DynamicSystem/pidtune - PID tuning algorithm for linear plant model
    This MATLAB function designs a PID controller of type type for the plant
    sys.

    Syntax
      C = pidtune(sys,type)
      C = pidtune(sys,C0)
      C = pidtune(___,wc)
      C = pidtune(___,opts)
      [C,info] = pidtune(___)

    Input Arguments
      sys - Plant model
        dynamic system model
      type - Controller type
        'P' | 'PI' | 'PD' | 'PID' | 'PI2' | 'PIDF2' | 'I-PD' | ...
      C0 - Baseline controller
        pid object | pidstd object | pid2 object | pidstd2 object
      wc - Target crossover frequency
        scalar
      opts - Tuning options
        pidtuneOptions object

    Output Arguments
      C - Controller
        pid object | pidstd object | pid2 object | pidstd2 object
      info - Additional information
        struct

    Examples
      openExample('control/PIDControllerDesignAtTheCommandLineExample')
      openExample('control/DesignStandardFormPIDControllerExample')
      openExample('control/SpecifyIntegratorDiscretizationMethodExample')
      openExample('control/Design2DOFPIDControllerExample')

    See also pidtuneOptions, pidTuner, PID Tuner, Tune PID Controller, pid,
      pidstd, pid2, pidstd2

    Introduced in Control System Toolbox in R2010b
    Documentation for DynamicSystem/pidtune
       doc DynamicSystem/pidtune

    Other uses of pidtune

       slTuner/pidtune