I have tried to do Bode plot of my uncompensated plant by myself in LTspice 17.1, but the result looks strange to me. This topic is a follow-on to this one.. I have no clue why it comes with 290 degree phase margin because it’s always so close to 180 degrees.
.op), linearization, and small-signal AC steady-state analysis. A highly nonlinear circuit like this will have a meaningless operating point. You must do a transient simulation, and average over many switching cycles, to get the control system response. Or use a simulator that can do a more advanced analysis mode (periodic steady state?). \$\endgroup\$