Title:
METHOD AND SYSTEM FOR ON-LINE CONDITION MONITORING OF DC-LINK CAPACITOR IN POWER CONVERTER
Document Type and Number:
WIPO Patent Application WO/2019/127184
Kind Code:
A1
Abstract:
A method and system for on-line condition monitoring of a direct current (DC) -link capacitor in a power converter. The method includes detecting a first waveform of voltage at the DC-link capacitor that is generated by applying a first control signal with a first duty cycle for at least one first switching period on the power converter (310). The method also includes detecting a second waveform of voltage at the DC-link capacitor that is generated by applying a second control signal with a second duty cycle for at least one second switching period following the at least one first switching period on the power converter (320), the second duty cycle deviating from the first duty cycle within a predetermined range. The method further includes determining, based on the second waveform, a parameter related to a health condition of the DC-link capacitor (330).
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Inventors:
GE JUNJIE (CN)
MENG JINLEI (CN)
ZHANG WENLIANG (CN)
LI TINHO (CN)
MENG JINLEI (CN)
ZHANG WENLIANG (CN)
LI TINHO (CN)
Application Number:
PCT/CN2017/119253
Publication Date:
July 04, 2019
Filing Date:
December 28, 2017
Export Citation:
Assignee:
ABB SCHWEIZ AG (CH)
GE JUNJIE (CN)
MENG JINLEI (CN)
ZHANG WENLIANG (CN)
LI TINHO (CN)
GE JUNJIE (CN)
MENG JINLEI (CN)
ZHANG WENLIANG (CN)
LI TINHO (CN)
International Classes:
G01R27/26
Foreign References:
| CN106549570A | 2017-03-29 | |||
| CN105044470A | 2015-11-11 | |||
| CN105866554A | 2016-08-17 | |||
| CN105717368A | 2016-06-29 | |||
| EP3324529A1 | 2018-05-23 | |||
| KR20110053795A | 2011-05-24 |
Attorney, Agent or Firm:
KING & WOOD MALLESONS (CN)
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