unwrapped phase in bode plot
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For an iwpt system, I am getting bode phase plot like in the attached image (Blue one)
1) Why we get this kind of phase plot?
2) How to convert it into -180 to +180 degree phase plot?
3) How to proceed with controller design for such systems?
回答（1 个）
If using bodeplot to make the plot, then use the plotoptions returned from bodeoptions with PhaseWrapping 'on',
For example
h = zpk([],-1,1); h = h^8; % transfer function with lots of phase change
plotoptions = bodeoptions;
plotoptions.PhaseWrapping='on';
bodeplot(h,plotoptions);
If not using bodeplot then we'll need to know how that plot is being constructed to get it into the desired form.
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