The red curve is the offset response. The offset response is the plant response to a
constant input of. The response shows that the model has some transients with a
constant input, in particular:
- The [0 0.001] second range where the converter reaches the 15V steady state. Recall
that this signal is the control error signal and hence drops to zero as steady state is
reached. - The [0.0025 0.004] second range where the converter reacts to the current load being
applied while the reference voltage is maintained at 15V. - The 0.004 second point where the reference voltage signal is changed from 15V to
25V resulting in a larger control error signal.
Design PID Controller Using Simulated I/O Data