Title:
FAULT DIAGNOSIS METHOD AND DIAGNOSIS DEVICE
Document Type and Number:
WIPO Patent Application WO/2021/253790
Kind Code:
A1
Abstract:
A fault diagnosis method and a diagnosis device provided in the present invention are applied to the technical field of photovoltaic power generation. Said method comprises: acquiring a high-irradiance IV data set and a low-irradiance IV data set of a diagnosis object, taking any one IV data set as a target IV data set, selecting, from the target IV data set, target IV data as inflection point data, taking the other IV data set as a reference IV data set, and selecting, from the reference IV data set, IV data having the same voltage value corresponding to the target IV data to serve as reference IV data. If the reference IV data also belongs to the inflection point data, a mismatch type of the diagnosis object is determined according to the target IV data and the result of the irradiation degree changing with the reference IV data. According to the present method, by analyzing the IV data under different irradiation conditions, whether the mismatch fault of the diagnosis object is a front current mismatch or a back current mismatch is determined, such that decoupling of a fault determination result of the diagnosis object is achieved, and the accuracy of fault diagnosis is improved.
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Inventors:
YUN PING (CN)
CUI XIN (CN)
XU JUN (CN)
CUI XIN (CN)
XU JUN (CN)
Application Number:
PCT/CN2020/140475
Publication Date:
December 23, 2021
Filing Date:
December 29, 2020
Export Citation:
Assignee:
SUNGROW POWER SUPPLY CO LTD (CN)
International Classes:
H02S50/10
Foreign References:
| CN109861644A | 2019-06-07 | |||
| CN109510595A | 2019-03-22 | |||
| CN105827200A | 2016-08-03 | |||
| JP2013168591A | 2013-08-29 | |||
| CN111682846A | 2020-09-18 | |||
| CN202010553975A | 2020-06-17 |
Attorney, Agent or Firm:
UNITALEN ATTORNEYS AT LAW (CN)
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