US 12,003,105 B2
Multi-channel grid-connected power generation system and control method therefor
Guohua Xiang, Hefei (CN); Lin Cheng, Hefei (CN); Jie Ding, Hefei (CN); and Nianan Pan, Hefei (CN)
Assigned to SUNGROW POWER SUPPLY CO., LTD., Anhui (CN)
Appl. No. 17/642,113
Filed by SUNGROW POWER SUPPLY CO., LTD., Anhui (CN)
PCT Filed Jun. 11, 2020, PCT No. PCT/CN2020/095501
§ 371(c)(1), (2) Date Mar. 10, 2022,
PCT Pub. No. WO2021/217794, PCT Pub. Date Nov. 4, 2021.
Claims priority of application No. 202010362289.7 (CN), filed on Apr. 30, 2020.
Prior Publication US 2023/0040509 A1, Feb. 9, 2023
Int. Cl. H02J 3/10 (2006.01); H02J 3/38 (2006.01); H02J 13/00 (2006.01)
CPC H02J 3/10 (2013.01) [H02J 3/381 (2013.01); H02J 13/00002 (2020.01)] 11 Claims
OG exemplary drawing
 
1. A multi-channel grid-connected power generation system, wherein multi-channel energy conversion devices are connected in parallel, each of the multi-channel energy conversion devices is connected to a same collector line through a corresponding step-up transformer, one end of the collector line is connected to a power grid through one switching device, and the switching device is controlled to be switched on or switched off by one control unit;
wherein in a case that the control unit determines that each of the multi-channel energy conversion devices is in a non-operational state, the control unit is configured to send a switch-off command to the switching device; and
wherein in a switch-off state of the switching device, at least one energy conversion device is configured to start to operate as a voltage source to establish an alternating current (AC) voltage in a case that a start-up condition is met, so that a phase difference and an amplitude difference of a voltage across the switching device are both stabilized within an allowable error range, the control unit is configured to send a switch-on command to the switching device, and other energy conversion devices in the multi-channel energy conversion devices other than the at least one energy conversion device are configured to start to operate as a current source to transfer energy to the power grid;
wherein meeting the start-up condition indicates that an energy value of a front-stage power supply of an energy conversion device is not lower than a preset value required by said energy conversion device and said energy conversion device is not prohibited by a centralized control room, and the other energy conversion devices include energy conversion devices of which a corresponding start-up condition is met.