Title:
RESISTOR-TYPE SUB-MODULE MIXED-TYPE MMC AND DIRECT-CURRENT FAULT PROCESSING POLICY THEREFOR
Document Type and Number:
WIPO Patent Application WO/2021/196563
Kind Code:
A1
Abstract:
Disclosed are a resistor-type sub-module mixed-type MMC and a direct-current fault processing policy therefor. According to the mixed-type MMC, three-phase short-circuiting to ground is artificially generated at an alternating-current side of a converter during a direct-current fault processing process, so as to prevent a fault current from entering a direct-current system from the alternating-current side. Comparing the resistor-type sub-module mixed-type MMC with a sub-module mixed-type MMC, the number of required power electronic devices can be reduced. Moreover, direct-current faults of the mixed-type MMC are processed more quickly, and the duration of the artificially made three-phase short-circuiting to ground fault during the fault processing process does not exceed 60 ms, and therefore, an alternating-current system will not be greatly influenced. In the present invention, the proportion of resistor-type sub-modules required by the MMC is only 30% of that of half-bridge sub-modules, thereby greatly reducing the cost for constructing an overhead line high-voltage flexible direct-current power transmission system, and the MMC has a very great reference significance and use value in engineering.
Inventors:
ZHANG ZHEREN (CN)
XU ZHENG (CN)
XU YUZHE (CN)
XU ZHENG (CN)
XU YUZHE (CN)
Application Number:
PCT/CN2020/121131
Publication Date:
October 07, 2021
Filing Date:
October 15, 2020
Export Citation:
Assignee:
UNIV ZHEJIANG (CN)
International Classes:
H02M7/217; H02H7/10; H02H7/26; H02J5/00
Foreign References:
| CN109510179A | 2019-03-22 | |||
| CN104767185A | 2015-07-08 | |||
| CN110867884A | 2020-03-06 | |||
| CN111327216A | 2020-06-23 | |||
| CN109617439A | 2019-04-12 | |||
| US20200007028A1 | 2020-01-02 |
Attorney, Agent or Firm:
FANG & ASSOCIATES (CN)
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