Title:
GROUNDING DETECTION METHOD AND DEVICE USING SAME
Document Type and Number:
WIPO Patent Application WO/2021/073097
Kind Code:
A1
Abstract:
Provided are a grounding detection method and a device using same. The grounding detection method is applied to a controller in a PWM-control-type grid-connected inverter in a low-voltage power grid system, and comprises: when a PWM-control-type grid-connected inverter satisfies a grounding detection condition, first controlling a grounding power supply in the PWM-control-type grid-connected inverter to apply a preset current or a preset voltage between a preset position and the ground (S200), wherein the preset position is a pole of a direct-current bus in the PWM-control-type grid-connected inverter or an output end of an alternating-current-side coupling circuit; and then determining whether the voltage of a pole of the direct-current bus or the output end of the alternating-current-side coupling circuit with respect to the ground changes (S300), so as to determine whether the PWM-control-type grid-connected inverter is sufficiently grounded, thus realizing automatic detection of a grounding condition of the grid-connected inverter, thereby solving the problem in the prior art of the dependence on manual work.
Inventors:
CHEN PENG (CN)
WU YONGFU (CN)
XU QINGQING (CN)
WU YONGFU (CN)
XU QINGQING (CN)
Application Number:
PCT/CN2020/092061
Publication Date:
April 22, 2021
Filing Date:
May 25, 2020
Export Citation:
Assignee:
SUNGROW POWER SUPPLY CO LTD (CN)
International Classes:
G01R31/52
Foreign References:
| CN110687476A | 2020-01-14 | |||
| CN2727751Y | 2005-09-21 | |||
| CN103278729A | 2013-09-04 | |||
| US20070008666A1 | 2007-01-11 | |||
| CN109991502A | 2019-07-09 | |||
| CN109188167A | 2019-01-11 | |||
| CN106093590A | 2016-11-09 | |||
| JP2013060776A | 2013-04-04 | |||
| CN109188166A | 2019-01-11 | |||
| CN201910983849A | 2019-10-16 |
Other References:
See also references of EP 3992651A4
Attorney, Agent or Firm:
UNITALEN ATTORNEYS AT LAW (CN)
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