Title:
GRID-TIE INVERTER SYSTEM AND LOW-FREQUENCY OSCILLATION SUPPRESSION METHOD
Document Type and Number:
WIPO Patent Application WO/2024/067558
Kind Code:
A1
Abstract:
The present application discloses a grid-tie inverter system and a low-frequency oscillation suppression method. The system comprises a converter, a supplementary damping controller, a sampling circuit, and a controller. The converter is connected to a direct-current input end, a power grid, the controller, and the sampling circuit. The sampling circuit is connected to the supplementary damping controller. The controller is connected to the supplementary damping controller. The converter is used for outputting a grid-tie voltage, a grid-tie current and power to the power grid. The sampling circuit is used for detecting the grid-tie voltage, the grid-tie current and a power frequency of the power grid. When the power grid is in a low-frequency oscillation state, the supplementary damping controller is used for outputting a power supplement value to the controller on the basis of the grid-tie voltage and the power frequency. The power supplement value comprises an active power supplement value and a reactive power supplement value. According to the power supplement value, the controller is used for adjusting reactive power and active power output by the converter. According to the present application, output power of the converter is adjusted according to the power supplement value to suppress low-frequency oscillation, thereby reducing grid-tie voltage fluctuation and power generation loss.
Inventors:
SHAO ZHANGPING (CN)
YANG HAITAO (CN)
XIN KAI (CN)
YANG HAITAO (CN)
XIN KAI (CN)
Application Number:
PCT/CN2023/121476
Publication Date:
April 04, 2024
Filing Date:
September 26, 2023
Export Citation:
Assignee:
HUAWEI DIGITAL POWER TECH CO LTD (CN)
International Classes:
H02J3/48; H02J3/00; H02J3/24; H02J3/50
Foreign References:
| CN115589035A | 2023-01-10 | |||
| CN113890115A | 2022-01-04 | |||
| CN1794537A | 2006-06-28 | |||
| US20140032000A1 | 2014-01-30 |
Attorney, Agent or Firm:
TDIP & PARTNERS (CN)
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