AC Impedance Modeling of Modular Multilevel Converters and Two-Level Voltage-Source Converters: Similarities and Differences

Heng Wu; Xiongfei Wang; Lukasz Kocewiak; Lennart Harnefors

doi:10.1109/COMPEL.2018.8459952

AC Impedance Modeling of Modular Multilevel Converters and Two-Level Voltage-Source Converters: Similarities and Differences

Heng Wu, Xiongfei Wang, Lukasz Kocewiak, Lennart Harnefors

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

43 Citations (Scopus)

Abstract

This paper presents a small-signal model for modular multilevel converters (MMCs) by using the harmonic state space (HSS) method. The ac output impedance of the MMC is then derived and compared with that of the commonly used two-level voltage-source converters (TL-VSCs). It turns out that the low frequency ac impedance of the MMC differs from that of the TL-VSC, due to the influences of internal dynamics, especially for the open-loop control and the voltage-mode control. In contrast, for the current-mode control, this difference can be minimized by the current regulator with a high-gain in the low frequency range. Moreover, despite the used control schemes, the high frequency ac impedance of the MMC is similar to that of the TL-VSC. The time-domain simulations are provided to validate the effectiveness of the theoretical analysis.

Original language	English
Title of host publication	Proceedings of the 2018 IEEE 19th Workshop on Control and Modeling for Power Electronics (COMPEL)
Number of pages	8
Publisher	IEEE Press
Publication date	10 Sept 2018
Pages	1-8
Article number	8459952
ISBN (Print)	978-1-5386-5542-9
ISBN (Electronic)	978-1-5386-5541-2
DOIs	https://doi.org/10.1109/COMPEL.2018.8459952
Publication status	Published - 10 Sept 2018
Event	19th IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2018 - Padova, Italy Duration: 25 Jun 2018 → 28 Jun 2018

Conference

Conference	19th IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2018
Country/Territory	Italy
City	Padova
Period	25/06/2018 → 28/06/2018

Keywords

modular multilevel converter
small-signal model
harmonic state space
impedance modeling

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Cite this

@inproceedings{a3858466925e48b4bca9c77290eee635,

title = "AC Impedance Modeling of Modular Multilevel Converters and Two-Level Voltage-Source Converters: Similarities and Differences",

abstract = "This paper presents a small-signal model for modular multilevel converters (MMCs) by using the harmonic state space (HSS) method. The ac output impedance of the MMC is then derived and compared with that of the commonly used two-level voltage-source converters (TL-VSCs). It turns out that the low frequency ac impedance of the MMC differs from that of the TL-VSC, due to the influences of internal dynamics, especially for the open-loop control and the voltage-mode control. In contrast, for the current-mode control, this difference can be minimized by the current regulator with a high-gain in the low frequency range. Moreover, despite the used control schemes, the high frequency ac impedance of the MMC is similar to that of the TL-VSC. The time-domain simulations are provided to validate the effectiveness of the theoretical analysis.",

keywords = "modular multilevel converter, small-signal model, harmonic state space, impedance modeling",

author = "Heng Wu and Xiongfei Wang and Lukasz Kocewiak and Lennart Harnefors",

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booktitle = "Proceedings of the 2018 IEEE 19th Workshop on Control and Modeling for Power Electronics (COMPEL)",

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Wu, H , Wang, X, Kocewiak, L & Harnefors, L 2018, AC Impedance Modeling of Modular Multilevel Converters and Two-Level Voltage-Source Converters: Similarities and Differences. in Proceedings of the 2018 IEEE 19th Workshop on Control and Modeling for Power Electronics (COMPEL)., 8459952, IEEE Press, pp. 1-8, 19th IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2018, Padova, Italy, 25/06/2018. https://doi.org/10.1109/COMPEL.2018.8459952

AC Impedance Modeling of Modular Multilevel Converters and Two-Level Voltage-Source Converters: Similarities and Differences. / Wu, Heng ; Wang, Xiongfei; Kocewiak, Lukasz et al.
Proceedings of the 2018 IEEE 19th Workshop on Control and Modeling for Power Electronics (COMPEL). IEEE Press, 2018. p. 1-8 8459952.

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

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N2 - This paper presents a small-signal model for modular multilevel converters (MMCs) by using the harmonic state space (HSS) method. The ac output impedance of the MMC is then derived and compared with that of the commonly used two-level voltage-source converters (TL-VSCs). It turns out that the low frequency ac impedance of the MMC differs from that of the TL-VSC, due to the influences of internal dynamics, especially for the open-loop control and the voltage-mode control. In contrast, for the current-mode control, this difference can be minimized by the current regulator with a high-gain in the low frequency range. Moreover, despite the used control schemes, the high frequency ac impedance of the MMC is similar to that of the TL-VSC. The time-domain simulations are provided to validate the effectiveness of the theoretical analysis.

AB - This paper presents a small-signal model for modular multilevel converters (MMCs) by using the harmonic state space (HSS) method. The ac output impedance of the MMC is then derived and compared with that of the commonly used two-level voltage-source converters (TL-VSCs). It turns out that the low frequency ac impedance of the MMC differs from that of the TL-VSC, due to the influences of internal dynamics, especially for the open-loop control and the voltage-mode control. In contrast, for the current-mode control, this difference can be minimized by the current regulator with a high-gain in the low frequency range. Moreover, despite the used control schemes, the high frequency ac impedance of the MMC is similar to that of the TL-VSC. The time-domain simulations are provided to validate the effectiveness of the theoretical analysis.

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AC Impedance Modeling of Modular Multilevel Converters and Two-Level Voltage-Source Converters: Similarities and Differences

Abstract

Conference

Keywords

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Multi-Timescale Stability of Modular Cascaded Power Electronic Systems

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AC Impedance Modeling of Modular Multilevel Converters and Two-Level Voltage-Source Converters: Similarities and Differences

Abstract

Conference

Keywords

Access to Document

AUB Link

Other files and links

Fingerprint

Projects

Multi-Timescale Stability of Modular Cascaded Power Electronic Systems

Cite this