Double Half-Bridge Submodule based Modular Multilevel Converters with Reduced Voltage Sensors

Chengkai Liu; Fujin Deng; Qingsong Wang; Yanbo Wang; Frede Blaabjerg; Zheng Wang

doi:10.1109/TPEL.2020.3026394

Double Half-Bridge Submodule based Modular Multilevel Converters with Reduced Voltage Sensors

Chengkai Liu, Fujin Deng, Qingsong Wang, Yanbo Wang, Frede Blaabjerg, Zheng Wang

Research output: Contribution to journal › Journal article › Research › peer-review

13 Citations (Scopus)

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Abstract

The half-bridge (HB) submodule (SM) based MMC requires a large number of sensors to measure capacitor voltages. In this letter, a double half-bridge (DHB) SM based MMC is proposed, where each SM consists of two HBs. But only one voltage sensor is equipped in each DHB-SM for capacitor voltage estimation, which is connected between positive poles of two capacitors in the DHB-SM. A capacitor voltage estimation method is also proposed, which can estimate capacitor voltages in the proposed MMC with only a half number of voltage sensors in comparison with HB-SM based MMCs. A DHB-SM based MMC prototype is built to verify the effectiveness of the proposed method.

Original language	English
Article number	9205619
Journal	I E E E Transactions on Power Electronics
Volume	36
Issue number	4
Pages (from-to)	3643-3648
Number of pages	6
ISSN	0885-8993
DOIs	https://doi.org/10.1109/TPEL.2020.3026394
Publication status	Published - Apr 2021

Keywords

Half bridge (HB)
modular multilevel converters (MMCs)
submodule (SM)
voltage sensor

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10.1109/TPEL.2020.3026394

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title = "Double Half-Bridge Submodule based Modular Multilevel Converters with Reduced Voltage Sensors",

abstract = "The half-bridge (HB) submodule (SM) based MMC requires a large number of sensors to measure capacitor voltages. In this letter, a double half-bridge (DHB) SM based MMC is proposed, where each SM consists of two HBs. But only one voltage sensor is equipped in each DHB-SM for capacitor voltage estimation, which is connected between positive poles of two capacitors in the DHB-SM. A capacitor voltage estimation method is also proposed, which can estimate capacitor voltages in the proposed MMC with only a half number of voltage sensors in comparison with HB-SM based MMCs. A DHB-SM based MMC prototype is built to verify the effectiveness of the proposed method.",

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T1 - Double Half-Bridge Submodule based Modular Multilevel Converters with Reduced Voltage Sensors

AU - Liu, Chengkai

AU - Deng, Fujin

AU - Wang, Qingsong

AU - Wang, Yanbo

AU - Blaabjerg, Frede

AU - Wang, Zheng

PY - 2021/4

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N2 - The half-bridge (HB) submodule (SM) based MMC requires a large number of sensors to measure capacitor voltages. In this letter, a double half-bridge (DHB) SM based MMC is proposed, where each SM consists of two HBs. But only one voltage sensor is equipped in each DHB-SM for capacitor voltage estimation, which is connected between positive poles of two capacitors in the DHB-SM. A capacitor voltage estimation method is also proposed, which can estimate capacitor voltages in the proposed MMC with only a half number of voltage sensors in comparison with HB-SM based MMCs. A DHB-SM based MMC prototype is built to verify the effectiveness of the proposed method.

AB - The half-bridge (HB) submodule (SM) based MMC requires a large number of sensors to measure capacitor voltages. In this letter, a double half-bridge (DHB) SM based MMC is proposed, where each SM consists of two HBs. But only one voltage sensor is equipped in each DHB-SM for capacitor voltage estimation, which is connected between positive poles of two capacitors in the DHB-SM. A capacitor voltage estimation method is also proposed, which can estimate capacitor voltages in the proposed MMC with only a half number of voltage sensors in comparison with HB-SM based MMCs. A DHB-SM based MMC prototype is built to verify the effectiveness of the proposed method.

KW - Half bridge (HB)

KW - modular multilevel converters (MMCs)

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DO - 10.1109/TPEL.2020.3026394

M3 - Journal article

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Double Half-Bridge Submodule based Modular Multilevel Converters with Reduced Voltage Sensors

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