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Title:
FAULT POSITIONING METHOD AND SYSTEM FOR TWO-LEVEL VSC TYPE PHOTOVOLTAIC DUAL-END FLEXIBLE DIRECT CURRENT DISTRIBUTION NETWORK, AND APPLICATION
Document Type and Number:
WIPO Patent Application WO/2023/236230
Kind Code:
A1
Abstract:
The present invention relates to the technical field of fault positioning for a distributed power supply flexible direct current distribution network. Disclosed are a fault positioning method and system for a two-level VSC type photovoltaic dual-end flexible direct current distribution network, and an application. The method comprises: implementing fault section identification by using positive electrode current directions of direct current feeders during a fault period; establishing, according to transient stage equivalent circuits, an inter-electrode short-circuit fault ranging model covering system interactive responses; and solving fault distances by using fault electrical quantity parameter information to implement fault positioning. According to the present invention, a fault occurrence section can be correctly identified, fault accurate positioning is implemented by using fault electrical quantity parameter information, a key technology is provided for implementing quick positioning of an inter-electrode short-circuit fault of a flexible direct current distribution network, the power supply reliability of a system can be further increased, an error caused by a differential item of a traditional ranging method is effectively avoided, a positioning result is more accurate, the stability is good, the further development of the flexible direct current distribution network is facilitated to promote, and assistance is provided for construction of a novel power system under an energy transformation background.

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Inventors:
ZHANG ZHIHUA (CN)
WANG HAO (CN)
WANG KUN (CN)
TIAN YONGTAO (CN)
Application Number:
PCT/CN2022/098597
Publication Date:
December 14, 2023
Filing Date:
June 14, 2022
Export Citation:
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Assignee:
UNIV CHINA PETROLEUM EAST CHINA (CN)
International Classes:
G01R31/08
Domestic Patent References:
WO2018094862A12018-05-31
Foreign References:
CN110672972A2020-01-10
JP2003072431A2003-03-12
CN111289843A2020-06-16
Other References:
XIAOPING GAO, HUANG WENTAO, TAI NENGLING, MA ZHOUJUN, WANG YON: "Transient Current Based Fault Location Method of Pole-to-pole Short-circuit for Modular Multilevel Converter Low-voltage Direct Current", AUTOMATION OF ELECTRIC POWER SYSTEMS, NANJING ZIDONGHUA YANJIUSUO, NANJING, CN, vol. 44, no. 17, 10 September 2020 (2020-09-10), CN , pages 127 - 135, XP093113917, ISSN: 1000-1026, DOI: 10.7500/AEPS20200106004
Attorney, Agent or Firm:
BEIJING YUNJIAPAIFU INTELLECTUAL (CN)
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