.Buildings.Controls.OBC.CDL.Reals.Validation.PIDInitialState

Information

Validation test for the block Buildings.Controls.OBC.CDL.Reals.PID.

This model validates setting the initial state of the controller to a specified value.

The model sets the initial values xi_start=0.25 of the integrator for both instances of the controller. For the instance limPID, it also sets the initial value of the state of the derivative block xd_start=-0.5. The derivative block obtains as an input signal the value u=-0.5 because the set point weight for the derivative action is wd=0. Therefore, an initial state of x(t₀)=-0.5 causes the state of the derivative block to be at steady-state, because dx(t)/dt = (u - x)/T.

Revisions

• April 8, 2020, by Michael Wetter:
  First implementation.