Application of asymmetric full-bridge flying-capacitor MMC in marine propulsion motor
<b>[Objectives]</b> The Modular Multilevel Converter (MMC) has better speed regulation performance in AC transmission system because of its unique modularization and low switching frequency. In view of the problem of the capacitor voltage fluctuation of the sub-module and the overlarge c...
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Editorial Office of Chinese Journal of Ship Research
2019-12-01
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doaj-43fed3355d21401386b1afa64d9c0d572020-11-25T02:20:06ZengEditorial Office of Chinese Journal of Ship ResearchZhongguo Jianchuan Yanjiu1673-31851673-31852019-12-01146374710.19693/j.issn.1673-3185.01506201906006Application of asymmetric full-bridge flying-capacitor MMC in marine propulsion motorGuo Yi0Zhao Yibo1Zhao Ran2Logistics Engineering College, Shanghai Maritime University, Shanghai 201306, ChinaLogistics Engineering College, Shanghai Maritime University, Shanghai 201306, ChinaLogistics Engineering College, Shanghai Maritime University, Shanghai 201306, China<b>[Objectives]</b> The Modular Multilevel Converter (MMC) has better speed regulation performance in AC transmission system because of its unique modularization and low switching frequency. In view of the problem of the capacitor voltage fluctuation of the sub-module and the overlarge common-mode voltage caused by the traditional high-frequency injection method in the marine medium-voltage low-frequency operation mode of the MMC, an asymmetric full-bridge flying-capacitor MMC modified topology was proposed for marine electric propulsion systems.<b>[Methods]</b> Firstly,the working principle of the improved circuit topology and the cause of capacitor voltage fluctuation under low-frequency working conditions are introduced;then,the corresponding control scheme was designed by combining the square wave injection method and the circulation injection method with cutoff frequency. Finally,based on the Matlab/Simulink simulation platform,a 6 kV/36 MW permanent magnet synchronous propulsion motor model with propeller load was built to simulate the starting condition of the graded forward vehicle of the marine electric propulsion system.<b>[Results]</b> The simulation results show that this method can effectively reduce the percentage of capacitor voltage fluctuation from 16% to less than 8%, and no common-mode voltage injection.<b>[Conclusions]</b> The study in this paper can provide reference for the design of the frequency converter for marine medium-voltage direct-current electric propulsion systems.http://www.ship-research.com/EN/Y2019/V14/I6/37modular multilevel converter (mmc)asymmetric sub-modulecapacitor voltage fluctuationmarine propulsion motor |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Guo Yi Zhao Yibo Zhao Ran |
spellingShingle |
Guo Yi Zhao Yibo Zhao Ran Application of asymmetric full-bridge flying-capacitor MMC in marine propulsion motor Zhongguo Jianchuan Yanjiu modular multilevel converter (mmc) asymmetric sub-module capacitor voltage fluctuation marine propulsion motor |
author_facet |
Guo Yi Zhao Yibo Zhao Ran |
author_sort |
Guo Yi |
title |
Application of asymmetric full-bridge flying-capacitor MMC in marine propulsion motor |
title_short |
Application of asymmetric full-bridge flying-capacitor MMC in marine propulsion motor |
title_full |
Application of asymmetric full-bridge flying-capacitor MMC in marine propulsion motor |
title_fullStr |
Application of asymmetric full-bridge flying-capacitor MMC in marine propulsion motor |
title_full_unstemmed |
Application of asymmetric full-bridge flying-capacitor MMC in marine propulsion motor |
title_sort |
application of asymmetric full-bridge flying-capacitor mmc in marine propulsion motor |
publisher |
Editorial Office of Chinese Journal of Ship Research |
series |
Zhongguo Jianchuan Yanjiu |
issn |
1673-3185 1673-3185 |
publishDate |
2019-12-01 |
description |
<b>[Objectives]</b> The Modular Multilevel Converter (MMC) has better speed regulation performance in AC transmission system because of its unique modularization and low switching frequency. In view of the problem of the capacitor voltage fluctuation of the sub-module and the overlarge common-mode voltage caused by the traditional high-frequency injection method in the marine medium-voltage low-frequency operation mode of the MMC, an asymmetric full-bridge flying-capacitor MMC modified topology was proposed for marine electric propulsion systems.<b>[Methods]</b> Firstly,the working principle of the improved circuit topology and the cause of capacitor voltage fluctuation under low-frequency working conditions are introduced;then,the corresponding control scheme was designed by combining the square wave injection method and the circulation injection method with cutoff frequency. Finally,based on the Matlab/Simulink simulation platform,a 6 kV/36 MW permanent magnet synchronous propulsion motor model with propeller load was built to simulate the starting condition of the graded forward vehicle of the marine electric propulsion system.<b>[Results]</b> The simulation results show that this method can effectively reduce the percentage of capacitor voltage fluctuation from 16% to less than 8%, and no common-mode voltage injection.<b>[Conclusions]</b> The study in this paper can provide reference for the design of the frequency converter for marine medium-voltage direct-current electric propulsion systems. |
topic |
modular multilevel converter (mmc) asymmetric sub-module capacitor voltage fluctuation marine propulsion motor |
url |
http://www.ship-research.com/EN/Y2019/V14/I6/37 |
work_keys_str_mv |
AT guoyi applicationofasymmetricfullbridgeflyingcapacitormmcinmarinepropulsionmotor AT zhaoyibo applicationofasymmetricfullbridgeflyingcapacitormmcinmarinepropulsionmotor AT zhaoran applicationofasymmetricfullbridgeflyingcapacitormmcinmarinepropulsionmotor |
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1724873483541807104 |