Hybrid cancellation of ripple disturbances arising in AC/DC converters

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• 作者：Andrea Bisoffi^b ; ^{andrea.bisoffi@unitn.it}Author Vitae ; Luca Zaccarian^a ; ^b ; ^{zaccarian@laas.fr}Author Vitae ; Mauro Da Lio^b ; ^{mauro.dalio@unitn.it}Author Vitae ; Daniele Carnevale^c ; ^{daniele.carnevale@uniroma2.it}Author Vitae ; JET Contributors^d ; ¹
• 关键词：Hybrid dynamical system ; Hybrid observer ; Power system ; Tokamak plasma ; Ripple
• 刊名：Automatica
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：77
• 期：Complete
• 页码：344-352
• 全文大小：1222 K
• 卷排序：77

文摘

In AC/DC converters, a peculiar periodic nonsmooth waveform arises, the so-called ripple. In this paper we propose a novel model that captures this nonsmoothness by means of a hybrid dynamical system performing state jumps at certain switching instants, and we illustrate its properties with reference to a three phase diode bridge rectifier. As the ripple corrupts an underlying desirable signal, we propound two observer schemes ensuring asymptotic estimation of the ripple, the first with and the second without knowledge of the switching instants. Our theoretical developments are well placed in the context of recent techniques for hybrid regulation and constitute a contribution especially for our second observer, where the switching instants are estimated. Once asymptotic estimation of the ripple is achieved, the ripple can be conveniently canceled from the desirable signal, and thanks to the inherent robustness properties of the proposed hybrid formulation, the two observer schemes require only that the desirable signal is slowly time varying compared to the ripple. Exploiting this fact, we illustrate the effectiveness of our second hybrid observation law on experimental data collected from the Joint European Torus tokamak.