H ? Robust Control of an LCL-Type Grid-Connected Inverter with Large-Scale Grid Impedance Perturbation

Yingjie Wang, Jiashi Wang, Wei Zeng, Haiyuan Liu and Yushuo Chai
Additional contact information
Yingjie Wang: School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou 221000, China
Jiashi Wang: School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou 221000, China
Wei Zeng: School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou 221000, China
Haiyuan Liu: School of Information and Control Engineering, China University of Mining and Technology, Xuzhou 221000, China
Yushuo Chai: School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou 221000, China

Energies, 2018, vol. 11, issue 1, 1-19

Abstract: In the distributed power generation system (DPGS), there may be a large range perturbation values of equivalent grid impedance at the point of common coupling (PCC). Perturbation of the impedance will cause resonant frequency variation of the Inductance Capacitance Inductance (LCL) filter on a large scale, affecting the quality of the grid current of the grid-connected inverter (GCI) and even causing resonance. To deal with this problem, a novel H ? robust control strategy based on mixed-sensitivity optimization is proposed in this paper. Its generalized controlled object is augmented by properly selecting weighting functions in order to consider both tracking performance around power frequency and the stability margin in a high frequency of the GCI. For convenient implementation, the H ? robust controller is simplified by model reduction from the seventh order to the third order. By comparison with a traditional control strategy with a quasi-proportional resonance controller, the proposed H ? robust control strategy avoids crossing 180 degrees at the resonant frequency point in the phase frequency characteristic of current loop, and moves the phase frequency characteristic left. It guarantees a sufficient margin of stability throughout the designed range of grid impedance perturbation values and avoids the difficulty of parameter setting. Finally, the experimental results support the theoretical analyses and demonstrate the feasibility of the proposed strategy.

Keywords: Inductance Capacitance Inductance (LCL) filter; grid impedance perturbation; quasi-proportional resonance controller; H ? robust control (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: 2018
References: View complete reference list from CitEc
Citations: View citations in EconPapers (3)

Downloads: (external link)
https://www.mdpi.com/1996-1073/11/1/57/pdf (application/pdf)
https://www.mdpi.com/1996-1073/11/1/57/ (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:11:y:2018:i:1:p:57-:d:124984

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 ().