Small Signal Model of Modular Multilevel Matrix Converter for Fractional Frequency Transmission System
Fractional frequency transmission is a promising technology for medium distance offshore wind power transmission. The key component in the fractional frequency transmission system (FFTS) is the modular multilevel matrix converter (M<sup>3</sup>C). It is regarded as the next generation AC...
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doaj-be26757ec3884be189d2cf715c4ee34e2021-04-05T17:22:00ZengIEEEIEEE Access2169-35362019-01-01711018711019610.1109/ACCESS.2019.29320508781862Small Signal Model of Modular Multilevel Matrix Converter for Fractional Frequency Transmission SystemJiajie Luo0Xiao-Ping Zhang1https://orcid.org/0000-0003-0995-4989Ying Xue2Department of Electronic, Electrical and Systems Engineering, University of Birmingham, Birmingham, U.K.Department of Electronic, Electrical and Systems Engineering, University of Birmingham, Birmingham, U.K.Department of Electronic, Electrical and Systems Engineering, University of Birmingham, Birmingham, U.K.Fractional frequency transmission is a promising technology for medium distance offshore wind power transmission. The key component in the fractional frequency transmission system (FFTS) is the modular multilevel matrix converter (M<sup>3</sup>C). It is regarded as the next generation AC/AC converter for high voltage and high power applications due to various advantages such as high-quality waveforms, scalability, and controllability. It is important to fully study its impact on the power network. The key to the understanding and impact is the development of a suitable model, which is the focus of this paper. A small signal model of the M<sup>3</sup>C taking into account the dynamics of the capacitor voltage, AC currents, and the control system is developed. Electrical quantities from both AC sides at different frequencies couple in the M<sup>3</sup>C since there is no DC link. The complicated nonlinear terms in ABC frame are isolated and transformed in DQ frame. The model is convenient to interface with the control system and external AC systems. Small signal analysis is carried out on the influence of the controller parameters and sub-module capacitance. The correctness of the proposed model is verified by comparing to a detailed electromagnetic transient model of the M<sup>3</sup>C simulated in RTDS.https://ieeexplore.ieee.org/document/8781862/Fractional frequency transmission systemsmall signal modelmodular multilevel matrix converterAC/AC converterenergy storage |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Jiajie Luo Xiao-Ping Zhang Ying Xue |
spellingShingle |
Jiajie Luo Xiao-Ping Zhang Ying Xue Small Signal Model of Modular Multilevel Matrix Converter for Fractional Frequency Transmission System IEEE Access Fractional frequency transmission system small signal model modular multilevel matrix converter AC/AC converter energy storage |
author_facet |
Jiajie Luo Xiao-Ping Zhang Ying Xue |
author_sort |
Jiajie Luo |
title |
Small Signal Model of Modular Multilevel Matrix Converter for Fractional Frequency Transmission System |
title_short |
Small Signal Model of Modular Multilevel Matrix Converter for Fractional Frequency Transmission System |
title_full |
Small Signal Model of Modular Multilevel Matrix Converter for Fractional Frequency Transmission System |
title_fullStr |
Small Signal Model of Modular Multilevel Matrix Converter for Fractional Frequency Transmission System |
title_full_unstemmed |
Small Signal Model of Modular Multilevel Matrix Converter for Fractional Frequency Transmission System |
title_sort |
small signal model of modular multilevel matrix converter for fractional frequency transmission system |
publisher |
IEEE |
series |
IEEE Access |
issn |
2169-3536 |
publishDate |
2019-01-01 |
description |
Fractional frequency transmission is a promising technology for medium distance offshore wind power transmission. The key component in the fractional frequency transmission system (FFTS) is the modular multilevel matrix converter (M<sup>3</sup>C). It is regarded as the next generation AC/AC converter for high voltage and high power applications due to various advantages such as high-quality waveforms, scalability, and controllability. It is important to fully study its impact on the power network. The key to the understanding and impact is the development of a suitable model, which is the focus of this paper. A small signal model of the M<sup>3</sup>C taking into account the dynamics of the capacitor voltage, AC currents, and the control system is developed. Electrical quantities from both AC sides at different frequencies couple in the M<sup>3</sup>C since there is no DC link. The complicated nonlinear terms in ABC frame are isolated and transformed in DQ frame. The model is convenient to interface with the control system and external AC systems. Small signal analysis is carried out on the influence of the controller parameters and sub-module capacitance. The correctness of the proposed model is verified by comparing to a detailed electromagnetic transient model of the M<sup>3</sup>C simulated in RTDS. |
topic |
Fractional frequency transmission system small signal model modular multilevel matrix converter AC/AC converter energy storage |
url |
https://ieeexplore.ieee.org/document/8781862/ |
work_keys_str_mv |
AT jiajieluo smallsignalmodelofmodularmultilevelmatrixconverterforfractionalfrequencytransmissionsystem AT xiaopingzhang smallsignalmodelofmodularmultilevelmatrixconverterforfractionalfrequencytransmissionsystem AT yingxue smallsignalmodelofmodularmultilevelmatrixconverterforfractionalfrequencytransmissionsystem |
_version_ |
1721539836913909760 |