Title:
RAPID FAULT RECOGNITION METHOD BASED ON CURVATURE CHANGE OF DIRECT-CURRENT CURRENT WAVEFORM
Document Type and Number:
WIPO Patent Application WO/2019/037333
Kind Code:
A1
Abstract:
A rapid fault recognition method based on a curvature change of a direct-current current waveform, comprising: for a multi-end flexible direct-current power distribution system containing a power electronic converter, according to an electrical quantity characteristic in each phase after the occurrence of a direct-current bipolar short circuit fault, obtaining a mathematical expression of a fault current after the direct-current line fault (1); according to the obtained mathematical expression of the fault current, recognising a fault line utilising the difference in the change of the curvature of a current waveform after the fault by means of a curvature algorithm (2); and then according to the change conditions of a direct-current change rate di/dt, selecting a line switching on/off action, to realise fault protection of the line (3). In the method, based on a sudden change characteristic of a line current after a fault, the sudden change of the curvature of a current waveform is characterised by a curvature algorithm, achieving the aim of recognising an external fault, and improving the selectivity of protection for a sudden current change quantity.
Inventors:
JIA KE (CN)
WANG CONGBO (CN)
BI TIANSHU (CN)
LI MENG (CN)
LI CHENXI (CN)
XUAN ZHENWEN (CN)
FENG TAO (CN)
ZHAO QIJUAN (CN)
WANG CONGBO (CN)
BI TIANSHU (CN)
LI MENG (CN)
LI CHENXI (CN)
XUAN ZHENWEN (CN)
FENG TAO (CN)
ZHAO QIJUAN (CN)
Application Number:
PCT/CN2017/115155
Publication Date:
February 28, 2019
Filing Date:
December 08, 2017
Export Citation:
Assignee:
UNIV NORTH CHINA ELECTRIC POWER (CN)
International Classes:
G01R31/08
Foreign References:
| CN106407494A | 2017-02-15 | |||
| CN106684842A | 2017-05-17 | |||
| CN107069795A | 2017-08-18 |
Other References:
WANG, CONGBO ET AL.: "A New Protection Scheme for DC Substation System Based on Single-ended Measurement", 20TH INTERNATIONAL CONFERENCE ON ELECTRICAL MACHINES AND SYSTEMS (ICEMS, 11 August 2017 (2017-08-11), pages 1 - 5, XP033161025
26 July 2017 (2017-07-26)
26 July 2017 (2017-07-26)
Attorney, Agent or Firm:
BEIJING CATALY IP ATTORNEY AT LAW (CN)
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