Comparative study of small-signal stability under weak AC system integration for different VSCs

Xiaojun Lu; Wang Xiang; Weixing Lin; Jinyu Wen

doi:10.1109/JESTPE.2020.3024196

Comparative study of small-signal stability under weak AC system integration for different VSCs

Xiaojun Lu, Wang Xiang, Weixing Lin, Jinyu Wen

Electronic And Electrical Engineering

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Abstract

Voltage source converters (VSCs) with self-commutation ability are suitable to interconnect weak AC systems. This paper conducts a comparative study of the small-signal stability characteristics for three typical VSCs, namely, the two-level VSCs (TL-VSCs), the half-bridge modular multilevel converters (HB-MMCs) and the hybrid MMCs (HY-MMCs),underweak AC system integration with special consideration on both inverter and rectifier operation. The frequency responses based on impedance models are compared using the frequency-domain analysis. The oscillation frequencies and mainly participated state variables of the unstable modes are compared using root locus and participation factor analysis in time-domain. Proper parameter retuning approaches for stability enhancement are proposed. The above analysis is adequately validated by electromagnetic simulations.

Original language	English
Number of pages	17
Journal	IEEE Journal of Emerging and Selected Topics in Power Electronics
Early online date	15 Sep 2020
DOIs	https://doi.org/10.1109/JESTPE.2020.3024196
Publication status	E-pub ahead of print - 15 Sep 2020

Keywords

small signal model
small signal stability
modular multilevel converter
weak AC system

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10.1109/JESTPE.2020.3024196

Lu-etal-IEEE-JESTPE-2020-Comparative-study-of-small-signal-stability-under-weak-AC-systemAccepted author manuscript, 2.38 MB

Cite this

@article{6da5f2f1d1b348ffb3a5b44bbfb63205,

title = "Comparative study of small-signal stability under weak AC system integration for different VSCs",

abstract = "Voltage source converters (VSCs) with self-commutation ability are suitable to interconnect weak AC systems. This paper conducts a comparative study of the small-signal stability characteristics for three typical VSCs, namely, the two-level VSCs (TL-VSCs), the half-bridge modular multilevel converters (HB-MMCs) and the hybrid MMCs (HY-MMCs),underweak AC system integration with special consideration on both inverter and rectifier operation. The frequency responses based on impedance models are compared using the frequency-domain analysis. The oscillation frequencies and mainly participated state variables of the unstable modes are compared using root locus and participation factor analysis in time-domain. Proper parameter retuning approaches for stability enhancement are proposed. The above analysis is adequately validated by electromagnetic simulations. ",

keywords = "small signal model, small signal stability, modular multilevel converter, weak AC system",

author = "Xiaojun Lu and Wang Xiang and Weixing Lin and Jinyu Wen",

note = "{\textcopyright} 2020 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting /republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.",

year = "2020",

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T1 - Comparative study of small-signal stability under weak AC system integration for different VSCs

AU - Lu, Xiaojun

AU - Xiang, Wang

AU - Lin, Weixing

AU - Wen, Jinyu

N1 - © 2020 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting /republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

PY - 2020/9/15

Y1 - 2020/9/15

N2 - Voltage source converters (VSCs) with self-commutation ability are suitable to interconnect weak AC systems. This paper conducts a comparative study of the small-signal stability characteristics for three typical VSCs, namely, the two-level VSCs (TL-VSCs), the half-bridge modular multilevel converters (HB-MMCs) and the hybrid MMCs (HY-MMCs),underweak AC system integration with special consideration on both inverter and rectifier operation. The frequency responses based on impedance models are compared using the frequency-domain analysis. The oscillation frequencies and mainly participated state variables of the unstable modes are compared using root locus and participation factor analysis in time-domain. Proper parameter retuning approaches for stability enhancement are proposed. The above analysis is adequately validated by electromagnetic simulations.

AB - Voltage source converters (VSCs) with self-commutation ability are suitable to interconnect weak AC systems. This paper conducts a comparative study of the small-signal stability characteristics for three typical VSCs, namely, the two-level VSCs (TL-VSCs), the half-bridge modular multilevel converters (HB-MMCs) and the hybrid MMCs (HY-MMCs),underweak AC system integration with special consideration on both inverter and rectifier operation. The frequency responses based on impedance models are compared using the frequency-domain analysis. The oscillation frequencies and mainly participated state variables of the unstable modes are compared using root locus and participation factor analysis in time-domain. Proper parameter retuning approaches for stability enhancement are proposed. The above analysis is adequately validated by electromagnetic simulations.

KW - small signal model

KW - small signal stability

KW - modular multilevel converter

KW - weak AC system

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JO - IEEE Journal of Emerging and Selected Topics in Power Electronics

JF - IEEE Journal of Emerging and Selected Topics in Power Electronics

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