Use of boundary control with second-order switching surface to reduce the system order for deadbeat controller in grid-connected inverter

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Article number7117412
Pages (from-to)2638-2653
Journal / PublicationIEEE Transactions on Power Electronics
Volume31
Issue number3
Online published3 Jun 2015
Publication statusPublished - Mar 2016

Abstract

Deadbeat control is commonly used in grid-connected inverter with L filter, but it faces the challenge of having filter resonance in inverter with LCL filter. Although many active damping techniques have been proposed to tackle such phenomenon, their digital implementation would introduce nonminimum phase characteristics. Furthermore, the plant viewed by the deadbeat controller is of high order, making the system performance be susceptible to the drift of the filter parameters. This paper introduces a new perspective of using boundary control with second-order switching surface to reduce the order of the plant viewed by the deadbeat controller. The structure hybridizes the merits of the deadbeat control in its simplicity and the boundary control in achieving wide control bandwidth. Small-signal dynamic modeling of the boundary control is formulated. The performance sensitivities of the overall system to filter parameters and grid inductance variations are studied with the derived models. An online grid inductance estimation algorithm is proposed to assure sufficient phase margin under an extremely weak-grid condition. A 2-kW, 220-V, 50-Hz prototype with the switching frequency of 8 kHz has been built and evaluated. Its steady-state and transient behavior, and harmonic rejection capability under stiff- and weak-grid conditions are discussed.

Research Area(s)

  • Boundary control, Deadbeat control, Inverters, LCL filter, Second-order switching surface, Stiff grid, Weak grid

Citation Format(s)

Use of boundary control with second-order switching surface to reduce the system order for deadbeat controller in grid-connected inverter. / He, Yuanbin; Chung, Henry Shu-Hung; Ho, Carl Ngai-Man et al.

In: IEEE Transactions on Power Electronics, Vol. 31, No. 3, 7117412, 03.2016, p. 2638-2653.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review