Impedance Reshaping Control Strategy for Improving Resonance Suppression Performance of a Series-Compensated Grid-Connected System

Haining Wang, Yandong Chen, Wenhua Wu, Shuhan Liao, Zili Wang, Gaoxiang Li, Zhiwei Xie and Jian Guo
Additional contact information
Haining Wang: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Yandong Chen: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Wenhua Wu: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Shuhan Liao: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Zili Wang: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Gaoxiang Li: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Zhiwei Xie: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Jian Guo: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China

Energies, 2021, vol. 14, issue 10, 1-15

Abstract: In the series-compensated grid-connected system (SCGCS), there is an impedance interaction between the inverter impedance and the grid impedance that is prone to cause resonance in the SCGCS. In this paper, firstly, considering the effects of the phase-locked loop (PLL), current-loop, and frequency coupling, the broadband impedance model of the SCGCS is established. The stability of the SCGCS is analyzed by the impedance-based Nyquist stability criterion. It is found from the stability analysis that the impedance interaction between the inverter impedance and the grid impedance is the leading cause of the resonance. An impedance reshaping based resonance suppression method is proposed to suppress the resonance. The phase characteristics of the inverter equivalent output impedance are reshaped from the perspective of impedance. The phase margin at the intersection frequency of the inverter impedance and the grid impedance is improved. The proposed resonance suppression approach mainly consists of reshaping the current loop impedance and the novel phase-locked loop impedance. Finally, simulations and experiments are used to verify the feasibility of the resonance analysis and the effectiveness of the proposed control strategy.

Keywords: impedance reshaping; inverter; series compensation; resonance suppression (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: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/14/10/2844/pdf (application/pdf)
https://www.mdpi.com/1996-1073/14/10/2844/ (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:14:y:2021:i:10:p:2844-:d:555011

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 ().