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richieqianle
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Why are there only PID controllers, no PIIIDDD (higher order) controllers?

Transfer function of a PID controller is: \$I\cdot s + P+\dfrac{D}{s}\$

Are there controllers like: \$A\cdot s^2 + B\cdot s + C+\dfrac{D}{s} + \dfrac{E}{s^2}\$ ?

If so, are they common? Why do people usually just use a PID controller?

richieqianle
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