Title:
METHOD OF IDENTIFYING FAULT IN DC MICROGRID POWER LINE, DEVICE, AND DC MICROGRID SYSTEM
Document Type and Number:
WIPO Patent Application WO/2017/202165
Kind Code:
A1
Abstract:
A method of identifying a fault in a direct current (DC) microgrid power line, a device, and a DC microgrid system. The method comprises: acquiring a power line voltage in a DC microgrid; acquiring a branch current of any branch in the DC microgrid; obtaining, according to the power line voltage, a voltage increment value; obtaining, according to the branch current, a current increment value; determining whether the voltage increment value exceeds a first movement preconfigured value, and whether the current increment value exceeds a second movement preconfigured value; and if the voltage increment value exceeds the first movement preconfigured value, and the current increment value exceeds the second movement preconfigured value, determining that a power line fault occurs. The method can easily determine whether a fault occurs by comparing changes of a power line voltage and each branch current in a unit time, thereby providing over-current protection, resolving a problem of low protection reliability of conventional over-current protection resulting from a current limiting effect of a rectifier during a fault occurs in a DC microgrid.
Inventors:
NAN SHUGONG (CN)
TANG WENQIANG (CN)
HUANG MENG (CN)
REN PENG (CN)
ZHAO ZHIGANG (CN)
TANG WENQIANG (CN)
HUANG MENG (CN)
REN PENG (CN)
ZHAO ZHIGANG (CN)
Application Number:
PCT/CN2017/081707
Publication Date:
November 30, 2017
Filing Date:
April 24, 2017
Export Citation:
Assignee:
GREE ELECTRIC APPLIANCES INC ZHUHAI (CN)
International Classes:
H02H7/26; G01R31/08
Foreign References:
| CN104009452A | 2014-08-27 | |||
| CN105262069A | 2016-01-20 | |||
| CN204464976U | 2015-07-08 | |||
| JPH07322489A | 1995-12-08 |
Other References:
WU, WEIMIN ET AL.: "Key Technologies for DC Micro-Grids", TRANSACTIONS OF CHINA ELECTROTECHNICAL SOCIETY, vol. 27, no. 1, 31 January 2012 (2012-01-31), ISSN: 1000-6753
Attorney, Agent or Firm:
ADVANCE CHINA IP LAW OFFICE (CN)
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