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

Wei Jin, Yongli Li, Guangyu Sun and Lizhi Bu
Additional contact information
Wei Jin: Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, No. 92 Weijin Road, Nankai District, Tianjin 300072, China
Yongli Li: Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, No. 92 Weijin Road, Nankai District, Tianjin 300072, China
Guangyu Sun: Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, No. 92 Weijin Road, Nankai District, Tianjin 300072, China
Lizhi Bu: Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, No. 92 Weijin Road, Nankai District, Tianjin 300072, China

Energies, 2017, vol. 10, issue 5, 1-19

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.

Keywords: grid-connected inverter; inductor-capacitor-inductor (LCL) filter; power quality; active damping; repetitive control; H? theory; delay effects (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View complete reference list from CitEc
Citations: View citations in EconPapers (12)

Downloads: (external link)
https://www.mdpi.com/1996-1073/10/5/586/pdf (application/pdf)
https://www.mdpi.com/1996-1073/10/5/586/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:10:y:2017:i:5:p:586-:d:96703

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().