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Energies 2017, 10(5), 586; doi:10.3390/en10050586

H∞ Repetitive Control Based on Active Damping with Reduced Computation Delay for LCL-Type Grid-Connected Inverters

Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, No. 92 Weijin Road, Nankai District, Tianjin 300072, China
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Academic Editor: Gabriele Grandi
Received: 21 February 2017 / Revised: 20 April 2017 / Accepted: 20 April 2017 / Published: 25 April 2017
(This article belongs to the Section Electrical Power and Energy System)
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Abstract

In the paper, the H∞ repetitive current control scheme based on active damping along with the design method is proposed for three-phase grid-connected inverters with inductor-capacitor-inductor (LCL) filters. The control scheme aims to reduce the harmonic distortion of the output currents and achieve better efficiency. The design method introduces capacitor-current-feedback active damping into the H∞ controller design process by proposing an equivalent controlled plant. Additionally, based on the discrete model of the controlled plant with variable computation delay, the algebraic expression of the stable region for the feedback coefficient and the computation delay is obtained to avoid system instability caused by the digital control delay. Finally, the stability criterion is proposed to evaluate the stability of the discrete control system with the H∞ repetitive current control scheme. The theoretical analysis and experimental results prove that the control scheme presented in this paper not only can reject the harmonics of output currents, but is robust under the variation of the grid-impedance. View Full-Text
Keywords: grid-connected inverter; inductor-capacitor-inductor (LCL) filter; power quality; active damping; repetitive control; H∞ theory; delay effects grid-connected inverter; inductor-capacitor-inductor (LCL) filter; power quality; active damping; repetitive control; H∞ theory; delay effects
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Jin, W.; Li, Y.; Sun, G.; Bu, L. H∞ Repetitive Control Based on Active Damping with Reduced Computation Delay for LCL-Type Grid-Connected Inverters. Energies 2017, 10, 586.

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