Title:
MULTI-CHANNEL GRID-CONNECTED POWER GENERATION SYSTEM AND CONTROL METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2021/217794
Kind Code:
A1
Abstract:
The present application discloses a multi-channel grid-connected power generation system and a control method therefor, which lowers the system cost while reducing no-load losses of all step-up transformers. Multi-channel energy conversion devices in the system are each connected in parallel, by means of a step-up transformer, to the same collector line, one end of the collector line is connected to the grid by means of a switch device, and the on-off switching of the switch device is controlled by a control unit. The control unit sends a switch-off command to the switch device when same has determined that all of the energy conversion devices have entered a non-operating state. In the off state of the switch device, at least one energy conversion device, when meeting a start condition, starts to operate as a voltage source, and establishes an alternating-current voltage, so that the phase difference and amplitude difference of voltages at two ends of the switch device are both stable within an allowable error range. Then, the control unit sends a switch-on command to the switch device, and the other energy conversion devices start to operate as a current source to transfer energy to the grid.
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Inventors:
XIANG GUOHUA (CN)
CHENG LIN (CN)
DING JIE (CN)
PAN NIANAN (CN)
CHENG LIN (CN)
DING JIE (CN)
PAN NIANAN (CN)
Application Number:
PCT/CN2020/095501
Publication Date:
November 04, 2021
Filing Date:
June 11, 2020
Export Citation:
Assignee:
SUNGROW POWER SUPPLY CO LTD (CN)
International Classes:
H02J3/38
Foreign References:
| CN104242353A | 2014-12-24 | |||
| CN105490308A | 2016-04-13 | |||
| CN207719822U | 2018-08-10 | |||
| JP2016100918A | 2016-05-30 | |||
| CN202010362289A | 2020-04-30 |
Other References:
See also references of EP 4009472A4
Attorney, Agent or Firm:
UNITALEN ATTORNEYS AT LAW (CN)
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