Title:
IMPEDANCE MEASUREMENT METHOD AND PHOTOVOLTAIC SYSTEM
Document Type and Number:
WIPO Patent Application WO/2022/165691
Kind Code:
A1
Abstract:
Provided are an impedance measurement method (800, 900, 1000, 1100) and a photovoltaic system (400, 500, 1200, 1300, 1400, 1500, 1600), which help to reduce the complexity and cost of impedance measurement. Said method comprises: at a first time point and a second time point, respectively sampling a voltage between a direct current bus and protective earthing (PE) to obtain a first voltage value (U 1) and a second voltage value (U 2); at the first time point and the second time point, respectively sampling a leakage current (I rcd) on the direct current bus to obtain a first current value (I rcd1) and a second current value (I rcd2); and calculating an insulation impedance value (Rpv) of a combiner box (1, 2, …, M, 240) on the basis of a difference value between the first voltage value (U 1) and the second voltage value (U 2) and a difference value between the first current value (I rcd1) and the second current value (I rcd2), so as to determine whether the impedance of the combiner box (1, 2, …, M, 240) is abnormal.
Inventors:
LIN JIANFEI (CN)
GAO YONGBING (CN)
LIN TIANSAN (CN)
GAO YONGBING (CN)
LIN TIANSAN (CN)
Application Number:
PCT/CN2021/075168
Publication Date:
August 11, 2022
Filing Date:
February 04, 2021
Export Citation:
Assignee:
HUAWEI DIGITAL POWER TECH CO LTD (CN)
International Classes:
H02S50/00; G01R27/18
Foreign References:
| CN109600115A | 2019-04-09 | |||
| US20170343593A1 | 2017-11-30 | |||
| CN106992550A | 2017-07-28 | |||
| CN109696582A | 2019-04-30 | |||
| CN109725202A | 2019-05-07 | |||
| CN105606897A | 2016-05-25 | |||
| CN111610411A | 2020-09-01 |
Other References:
See also references of EP 4290764A4
Attorney, Agent or Firm:
LEADER PATENT & TRADEMARK FIRM (CN)
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