Analysis and mitigation of submodule capacitor overvoltage for MMC-based grid emulator under LVRT test

Zejie Li; Fangzhou Zhao; Xingxing Chen; Stig Munk-Nielsen; Martin Geske; Rayk  Grune; Xiongfei Wang

doi:10.1049/icp.2022.2761

Analysis and mitigation of submodule capacitor overvoltage for MMC-based grid emulator under LVRT test

Zejie Li, Fangzhou Zhao, Xingxing Chen, Stig Munk-Nielsen, Martin Geske, Rayk Grune, Xiongfei Wang^*

^*Corresponding author for this work

Research output: Contribution to book/anthology/report/conference proceeding › Article in proceeding › Research › peer-review

Abstract

The modular multilevel converter (MMC)-based grid emulator is recently reported as a promising approach for grid-code compliance testing of next-generation wind turbines. This paper reveals the overvoltage on the submodule (SM) capacitor of the MMC-based grid emulator during the low-voltage ride-through (LVRT) test, and proposes an approach to address such issue. First, a simplified average model is developed to quantify the maximum and minimum SM capacitor voltage during the LVRT test. Then, a SM capacitor energy balancing approach is proposed to mitigate the transient overvoltage, which limits the SM capacitor voltage within 60%~110% of the rated voltage. Simulation results have confirmed the correctness of the theoretical analysis.

Original language	English
Title of host publication	21st Wind & Solar Integration Workshop (WIW 2022)
Number of pages	8
Publisher	Institution of Engineering and Technology
Publication date	22 Oct 2022
Pages	1-8
ISBN (Electronic)	978-1-83953-833-9
DOIs	https://doi.org/10.1049/icp.2022.2761
Publication status	Published - 22 Oct 2022
Event	21st Wind & Solar Integration Workshop - , Netherlands Duration: 12 Oct 2022 → 14 Oct 2022

Conference

Conference	21st Wind & Solar Integration Workshop
Country/Territory	Netherlands
Period	12/10/2022 → 14/10/2022

Keywords

Grid emulator
MMC
Testing
SM capacitor overvoltage

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10.1049/icp.2022.2761

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MODELING AND CONTROL OF SCALABLE VERSATILE GRID EMULATION SYSTEM
Li, Z., Wang, X., Munk-Nielsen, S. & Zhao, F.
15/10/2020 → 14/04/2024
Project: PhD Project
MERGE: Megawatt Scalable Versatile Grid Emulation System
Wang, X., Bak-Jensen, B., Blaabjerg, F., Munk-Nielsen, S., Zhao, F., Taul, M. G., Ponnaganti, P. & Steffensen, B.
EUDP
01/08/2020 → 31/07/2023
Project: Research

Cite this

@inproceedings{a3a3f025527d4099ad789b7e0ec545a2,

title = "Analysis and mitigation of submodule capacitor overvoltage for MMC-based grid emulator under LVRT test",

abstract = "The modular multilevel converter (MMC)-based grid emulator is recently reported as a promising approach for grid-code compliance testing of next-generation wind turbines. This paper reveals the overvoltage on the submodule (SM) capacitor of the MMC-based grid emulator during the low-voltage ride-through (LVRT) test, and proposes an approach to address such issue. First, a simplified average model is developed to quantify the maximum and minimum SM capacitor voltage during the LVRT test. Then, a SM capacitor energy balancing approach is proposed to mitigate the transient overvoltage, which limits the SM capacitor voltage within 60%~110% of the rated voltage. Simulation results have confirmed the correctness of the theoretical analysis.",

keywords = "Grid emulator, MMC, Testing, SM capacitor overvoltage",

author = "Zejie Li and Fangzhou Zhao and Xingxing Chen and Stig Munk-Nielsen and Martin Geske and Rayk Grune and Xiongfei Wang",

year = "2022",

month = oct,

day = "22",

doi = "10.1049/icp.2022.2761",

language = "English",

pages = "1--8",

booktitle = "21st Wind & Solar Integration Workshop (WIW 2022)",

publisher = "Institution of Engineering and Technology",

address = "United States",

note = "21st Wind & Solar Integration Workshop ; Conference date: 12-10-2022 Through 14-10-2022",

}

Li, Z , Zhao, F, Chen, X, Munk-Nielsen, S, Geske, M, Grune, R & Wang, X 2022, Analysis and mitigation of submodule capacitor overvoltage for MMC-based grid emulator under LVRT test. in 21st Wind & Solar Integration Workshop (WIW 2022). Institution of Engineering and Technology, pp. 1-8, 21st Wind & Solar Integration Workshop, Netherlands, 12/10/2022. https://doi.org/10.1049/icp.2022.2761

Analysis and mitigation of submodule capacitor overvoltage for MMC-based grid emulator under LVRT test. / Li, Zejie ; Zhao, Fangzhou; Chen, Xingxing et al.
21st Wind & Solar Integration Workshop (WIW 2022). Institution of Engineering and Technology, 2022. p. 1-8.

Research output: Contribution to book/anthology/report/conference proceeding › Article in proceeding › Research › peer-review

TY - GEN

T1 - Analysis and mitigation of submodule capacitor overvoltage for MMC-based grid emulator under LVRT test

AU - Li, Zejie

AU - Zhao, Fangzhou

AU - Chen, Xingxing

AU - Munk-Nielsen, Stig

AU - Geske, Martin

AU - Grune, Rayk

AU - Wang, Xiongfei

PY - 2022/10/22

Y1 - 2022/10/22

N2 - The modular multilevel converter (MMC)-based grid emulator is recently reported as a promising approach for grid-code compliance testing of next-generation wind turbines. This paper reveals the overvoltage on the submodule (SM) capacitor of the MMC-based grid emulator during the low-voltage ride-through (LVRT) test, and proposes an approach to address such issue. First, a simplified average model is developed to quantify the maximum and minimum SM capacitor voltage during the LVRT test. Then, a SM capacitor energy balancing approach is proposed to mitigate the transient overvoltage, which limits the SM capacitor voltage within 60%~110% of the rated voltage. Simulation results have confirmed the correctness of the theoretical analysis.

AB - The modular multilevel converter (MMC)-based grid emulator is recently reported as a promising approach for grid-code compliance testing of next-generation wind turbines. This paper reveals the overvoltage on the submodule (SM) capacitor of the MMC-based grid emulator during the low-voltage ride-through (LVRT) test, and proposes an approach to address such issue. First, a simplified average model is developed to quantify the maximum and minimum SM capacitor voltage during the LVRT test. Then, a SM capacitor energy balancing approach is proposed to mitigate the transient overvoltage, which limits the SM capacitor voltage within 60%~110% of the rated voltage. Simulation results have confirmed the correctness of the theoretical analysis.

KW - Grid emulator

KW - MMC

KW - Testing

KW - SM capacitor overvoltage

U2 - 10.1049/icp.2022.2761

DO - 10.1049/icp.2022.2761

M3 - Article in proceeding

SP - 1

EP - 8

BT - 21st Wind & Solar Integration Workshop (WIW 2022)

PB - Institution of Engineering and Technology

T2 - 21st Wind & Solar Integration Workshop

Y2 - 12 October 2022 through 14 October 2022

ER -

Analysis and mitigation of submodule capacitor overvoltage for MMC-based grid emulator under LVRT test

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Conference

Keywords

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Projects

MODELING AND CONTROL OF SCALABLE VERSATILE GRID EMULATION SYSTEM

MERGE: Megawatt Scalable Versatile Grid Emulation System

Cite this