Title:
MICRO-INVERTER AND GRID-TIED OUTPUT CONTROL METHOD AND DEVICE THEREFOR
Document Type and Number:
WIPO Patent Application WO/2022/252800
Kind Code:
A1
Abstract:
A micro-inverter and a grid-tied output control method and device therefor. The micro-inverter comprises an inverter full-bridge circuit and an LC filter circuit. The LC filter circuit is grid-tied to a power grid by means of an output switch. The method comprises: acquiring a voltage amplitude, a frequency, and a phase of a power grid voltage by using phase locking; adjusting a power switching transistor driving an inverter full-bridge circuit to cause an output voltage of a micro-inverter to track the power grid voltage; and controlling the output switch to be turned off so that the micro-inverter works normally. According to the present application, before the output switch is turned off to grid-tie the micro-inverter, the power grid voltage is phase-locked and the output voltage of the micro-inverter is controlled to track the power grid voltage, so that damage to a power switching transistor caused by a current at the moment when the output switch is turned off can be effectively avoided, thereby effectively improving the reliability and the service life of the micro-inverter.
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Inventors:
ZHOU DONGMING (CN)
YANG YONGCHUN (CN)
QI BIAOJIE (CN)
LUO YUHAO (CN)
JIN KAIFENG (CN)
YANG YONGCHUN (CN)
QI BIAOJIE (CN)
LUO YUHAO (CN)
JIN KAIFENG (CN)
Application Number:
PCT/CN2022/084978
Publication Date:
December 08, 2022
Filing Date:
April 02, 2022
Export Citation:
Assignee:
ALTENERGY POWER SYSTEM INC (CN)
International Classes:
H02M7/5387; H02J3/38; H02M1/088; H02M1/12
Foreign References:
| CN113315401A | 2021-08-27 | |||
| CN103078545A | 2013-05-01 | |||
| CN109842154A | 2019-06-04 | |||
| CN104701886A | 2015-06-10 | |||
| JP2013110848A | 2013-06-06 | |||
| CN202110619296A | 2021-06-03 |
Attorney, Agent or Firm:
UNITALEN ATTORNEYS AT LAW (CN)
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