Please use this identifier to cite or link to this item: http://localhost/handle/Hannan/141547
Title: Control Strategy for Modular Multilevel Converters With Redundant Sub-modules Using Energy Reallocation
Authors: Zaifu Wang;Aimin Zhang;Hang Zhang;Zhigang Ren
Year: 2017
Publisher: IEEE
Abstract: By analyzing the topology and mathematical model of modular multilevel converters (MMCs), a control scheme based on the energy reallocation is proposed to control the MMC with redundant submodules. This control scheme is not only appropriate for the MMC in normal state but also applicable to the MMC in submodules fault state. Considering the circulating currents characteristics of the MMC in submodule fault state, a phase energy controller using proportional integral resonance control is presented, and the circulating currents can be suppressed. As the power loss of the MMCs is closely related to switching frequency of the IGBTs, a new modulation strategy based on arm current feedback is proposed in this paper, and this strategy considers not only the switching frequency's effect but also the collector current's effect on the switching losses. Taking the grid-connected MMC rectifier as an example, the effectiveness of the comprehensive control scheme and the new modulation strategy are verified by simulations and experiments on a MMC prototype.
URI: http://localhost/handle/Hannan/141547
volume: 32
issue: 3
More Information: 1556,
1564
Appears in Collections:2017

Files in This Item:
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7859420.pdf2.04 MBAdobe PDF
Title: Control Strategy for Modular Multilevel Converters With Redundant Sub-modules Using Energy Reallocation
Authors: Zaifu Wang;Aimin Zhang;Hang Zhang;Zhigang Ren
Year: 2017
Publisher: IEEE
Abstract: By analyzing the topology and mathematical model of modular multilevel converters (MMCs), a control scheme based on the energy reallocation is proposed to control the MMC with redundant submodules. This control scheme is not only appropriate for the MMC in normal state but also applicable to the MMC in submodules fault state. Considering the circulating currents characteristics of the MMC in submodule fault state, a phase energy controller using proportional integral resonance control is presented, and the circulating currents can be suppressed. As the power loss of the MMCs is closely related to switching frequency of the IGBTs, a new modulation strategy based on arm current feedback is proposed in this paper, and this strategy considers not only the switching frequency's effect but also the collector current's effect on the switching losses. Taking the grid-connected MMC rectifier as an example, the effectiveness of the comprehensive control scheme and the new modulation strategy are verified by simulations and experiments on a MMC prototype.
URI: http://localhost/handle/Hannan/141547
volume: 32
issue: 3
More Information: 1556,
1564
Appears in Collections:2017

Files in This Item:
File SizeFormat 
7859420.pdf2.04 MBAdobe PDF
Title: Control Strategy for Modular Multilevel Converters With Redundant Sub-modules Using Energy Reallocation
Authors: Zaifu Wang;Aimin Zhang;Hang Zhang;Zhigang Ren
Year: 2017
Publisher: IEEE
Abstract: By analyzing the topology and mathematical model of modular multilevel converters (MMCs), a control scheme based on the energy reallocation is proposed to control the MMC with redundant submodules. This control scheme is not only appropriate for the MMC in normal state but also applicable to the MMC in submodules fault state. Considering the circulating currents characteristics of the MMC in submodule fault state, a phase energy controller using proportional integral resonance control is presented, and the circulating currents can be suppressed. As the power loss of the MMCs is closely related to switching frequency of the IGBTs, a new modulation strategy based on arm current feedback is proposed in this paper, and this strategy considers not only the switching frequency's effect but also the collector current's effect on the switching losses. Taking the grid-connected MMC rectifier as an example, the effectiveness of the comprehensive control scheme and the new modulation strategy are verified by simulations and experiments on a MMC prototype.
URI: http://localhost/handle/Hannan/141547
volume: 32
issue: 3
More Information: 1556,
1564
Appears in Collections:2017

Files in This Item:
File SizeFormat 
7859420.pdf2.04 MBAdobe PDF