Technical communique: Tuning of phase-lead compensators for exact gain and phase margins

Authors:
Qing-Guo Wang;Zhen Ye;Chang Chieh Hang
Affiliations:
Department of Electrical and Computer Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore;Department of Electrical and Computer Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore;Department of Electrical and Computer Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore
Venue:
Automatica (Journal of IFAC)
Year:
2006

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Abstract

In this paper, a simple tuning method for phase-lead compensators with specifications of gain and phase margins is proposed. It can achieve the given margins exactly regardless of the plant order, time delay or damping nature. The solutions are found from the intersections of the curves of two real functions plotted using the frequency response of the plant only. An example is provided for illustration and comparison.