Detailed Wideband Impedance Modeling and Resonance Analysis of Grid-Connected Modular Multilevel Converter

Zheng Yan (), Jianyuan Xu, Gaole Yu, Enming Bai and Weidong Chen
Additional contact information
Zheng Yan: School of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, China
Jianyuan Xu: School of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, China
Gaole Yu: School of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, China
Enming Bai: School of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, China
Weidong Chen: School of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, China

Energies, 2023, vol. 16, issue 12, 1-22

Abstract: Modular multilevel converter (MMC) tends to cause resonance instability in interconnected systems. Current studies on the stability of MMC mainly focus on high-voltage and large-capacity power systems, while the impedance modeling process of MMC ignores the harmonics of the submodule (SM) capacitor voltages and the influence of voltage feedforward control. The applicability of the MMC impedance model with fewer submodules is doubtful. According to the circuit structure and control mode, the AC-side sequence impedance model of the MMC is established, which takes into account the capacitor voltage balance control of submodules and voltage feedforward control. Based on the RT-Lab control hardware-in-loop (CHIL) test platform, the MMC impedance frequency scanning was carried out to verify the accuracy of the impedance modeling method. The influence of control parameters in different frequency bands on the impedance characteristics of MMC was studied. The AC terminal voltage feedforward causes phase lag in the mid-/high-frequency range and increases the risk of resonance. In the low-frequency range, the dynamics and control of capacitor voltages reduce the impedance magnitude of MMC. Using the resonance phenomenon of an MMC connected to a weak grid as an example, the high-frequency resonance mechanism caused by control parameters is analyzed from the perspective of the negative damping effect. The simulation results show that the detailed wideband impedance model can improve the accuracy of the stability analysis results.

Keywords: modular multilevel converter (MMC); sequence impedance modeling; submodule capacitor voltage control; voltage feedforward control; resonance analysis (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: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

Downloads: (external link)
https://www.mdpi.com/1996-1073/16/12/4782/pdf (application/pdf)
https://www.mdpi.com/1996-1073/16/12/4782/ (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:16:y:2023:i:12:p:4782-:d:1173750

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 ().