Title:
TOPOLOGY STRUCTURE FOR SERIES-CONNECTED MMC CONVERTERS WITH SMALL NUMBER OF MODULES
Document Type and Number:
WIPO Patent Application WO/2022/188255
Kind Code:
A1
Abstract:
The present invention relates to the field of power systems, and in particular, to a topology structure for series-connected MMC converters with a small number of modules. The topology structure is composed of a three-phase bridge circuit, half-bridge valve strings, a three-phase filtering inductor and a three-phase power frequency transformer. By means of the topology structure for series-connected MMC converters with a small number of modules designed in the present invention, only two groups of half-bridge valve strings are needed; compared with traditional MMC structures, the number of valve strings is significantly reduced; and under the condition that the same high-voltage direct-current voltage output is realized, the power density of MMC converters can be increased, the stable output of voltages of three-phase alternating-current ports can be realized, and the balance of capacitor voltages of sub-modules in the two groups of half-bridge valve strings can also be realized. Comparing the topology structure designed in the present invention with traditional MMC topology structures, approximately two thirds of sub-modules can be saved on, and the topology structure designed in the present invention has a larger alternating-current and direct-current voltage transmission ratio, thereby facilitating the reduction of costs of MMC converters, reducing the size of an apparatus, and improving power density.
Inventors:
CHEN WU (CN)
SHU LIANGCAI (CN)
JIN HAOZHE (CN)
SHU LIANGCAI (CN)
JIN HAOZHE (CN)
Application Number:
PCT/CN2021/092111
Publication Date:
September 15, 2022
Filing Date:
May 07, 2021
Export Citation:
Assignee:
UNIV SOUTHEAST (CN)
International Classes:
H02M7/12; H02J3/36; H02M1/12
Foreign References:
| CN105305843A | 2016-02-03 | |||
| CN112271746A | 2021-01-26 | |||
| EP3223419A1 | 2017-09-27 |
Other References:
YANG, HEYA: "Topology Derivation and Control Strategy of Modular Multilevel Converters", CHINESE DOCTORAL DISSERTATIONS FULL-TEXT DATABASE (ELECTRONIC JOURNAL), 15 January 2021 (2021-01-15), pages 1 - 136, XP055966527, [retrieved on 20220929]
Attorney, Agent or Firm:
BEIJING TONGHUI INTELLECTUAL PROPERTY AGENCY (GENERAL PARTNERSHIP) (CN)
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