Grid-tied inverter apparatus and grid-tied control method
AssigneeHuawei Digital Power Technologies Co., Ltd.
InventorsYunyu Tang, Lei Shi, Yaojia Zhang, Dong Chen, Kai Xin
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Abstract
This application describes examples of a grid-tied inverter apparatus and a grid-tied control method. In one example, the grid-tied inverter apparatus includes an inverter circuit, a controller, and a filter circuit. The controller is configured to adjust switching frequencies of a plurality of power switching transistors based on an output current value of the inverter apparatus, to adjust a resonance frequency of the filter circuit through different resonant branches, so that the resonance frequency meets a grid-tied requirement.
Claims20
A grid-tied inverter apparatus, comprising:
- an inverter circuit comprising a plurality of power switching transistors connected in series or in parallel;
- a filter circuit comprising a plurality of resonant branches that comprise an inductor unit and a plurality of resonant units connected in parallel, wherein one end of the inverter circuit is connected to a direct current power supply, and another end of the inverter circuit is connected to a power grid or a load through the filter circuit;
- and
- a controller configured to adjust switching frequencies of the plurality of power switching transistors based on an output current value of the grid-tied inverter apparatus, to adjust a resonance frequency of the filter circuit through different resonant branches, wherein the resonance frequency meets a grid-tied requirement.
A grid-tied control method, applicable to a grid-tied inverter apparatus, wherein the grid-tied inverter apparatus comprises an inverter circuit, a controller, and a filter circuit, the inverter circuit comprises a plurality of power switching transistors connected in series or in parallel, the filter circuit comprises a plurality of resonant branches that comprise an inductor unit and a plurality of resonant units connected in parallel, one end of the inverter circuit is connected to a direct current power supply, another end of the inverter circuit is connected to a power grid or a load through the filter circuit, the controller is connected to the inverter circuit, and the grid-tied control method comprising:
- detecting an output current value of the grid-tied inverter apparatus;
- and
- adjusting switching frequencies of the plurality of power switching transistors based on the output current value of the grid-tied inverter apparatus, to adjust a resonance frequency of the filter circuit through different resonant branches, wherein the resonance frequency meets a grid-tied requirement.
A power supply system, comprising:
- a power supply;
- an inverter apparatus, wherein the inverter apparatus includes an inverter circuit, a controller, and a filter circuit, and wherein:
- the inverter circuit includes a plurality of power switching transistors connected in series or in parallel;
- the filter circuit includes a plurality of resonant branches that include an inductor unit and a plurality of resonant units connected in parallel, wherein one end of the inverter circuit is connected to a direct current power supply, another end of the inverter circuit is connected to a power grid or a load through the filter circuit;
- and
- the controller is connected to the inverter circuit.
Dependencies are inferred from the claim text.