Korean Journal of Chemical Engineering, Vol.25, No.6, 1273-1278, November, 2008
Enhanced frequency response estimator to guarantee pre-specified phase angle and static disturbance rejection with all harmonics removed
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We propose a new frequency response estimation method in order to guarantee a pre-specified phase angle of the estimated model under static disturbance circumstances with rejecting harmonics completely. The proposed method uses one cycle of the conventional relay feedback signal followed by a sinusoidal signal. The sinusoidal signal in a cyclic steady state has no harmonics, resulting in exact frequency response estimates. Also, it guarantees the pre-specified phase angle and removes the effects of static disturbances by adjusting the reference value of the sinusoidal signal.
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