How to find the max Phase lead provided by a Compensator?

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Gidel
Gidel 2023-12-1
评论： Sam Chak 2023-12-2
If I have a compensator such as s+1/s+3, is there a command to find the max phase lead angle provided by it?

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回答（2 个）

David Goodmanson
David Goodmanson 2023-12-1
编辑：David Goodmanson 2023-12-1
Hi Gidel,
It's not a single command and it's numeric, but is
w = 0:.001:10; maxangle = (180/pi)*max(angle((i*w+1)./(i*w+3))) % degrees
maxangle = 30.0000
sufficient?
Sam Chak
Sam Chak 2023-12-1
Ran in:
Hi @Gidel
You can also check using the bodeplot() for visual and the bode() for finding the max angle.
sys = tf([1 1], [1 3])
sys = s + 1 ----- s + 3 Continuous-time transfer function.
h = bodeplot(sys);
setoptions(h, 'FreqUnits', 'Hz', 'MagVisible', 'off');
grid on
[mag, phase, wout] = bode(sys);
maxAngle = max(phase)
maxAngle = 30.0000
  2 个评论
Gidel
Gidel 2023-12-1
Thank you, also is it possible to find the maximum gain from this?
Sam Chak
Sam Chak 2023-12-2
Ran in:
Hi @Gidel
Since your original question has been answered, perhaps you would also like to determine the compensator's magnitude at the frequency where the maximum phase angle occurs.
% Transfer function of the Lead Compensator
sys = tf([1 1], [1 3])
sys = s + 1 ----- s + 3 Continuous-time transfer function.
h = bodeplot(sys); grid on
% Extract data points from Bode plot
[mag, phase, wout] = bode(sys);
% Max phase angle
maxAngle = max(phase)
maxAngle = 30.0000
% Frequency at which the max phase angle occurs, ω_max
idx = find(phase == maxAngle);
wmax = wout(idx)
wmax = 1.7321
% Compensator's magnitude at ω_max
magwmax = mag(idx)
magwmax = 0.5774
% Check mag dB
magdB = 20*log10(magwmax)
magdB = -4.7712

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