A three-level DC-AC inverter suitable for photovoltaic grid-connected hydrogen production
By adopting a dual three-port three-level boost circuit and an interleaved parallel dual-coupled inductor structure in the photovoltaic grid-connected inverter, the problems of low voltage gain and leakage current are solved, efficient voltage gain and leakage current suppression are achieved, and the power quality of the grid is improved.
CN119030350BActive Publication Date: 2025-03-21NANJING NORMAL UNIVERSITY +1
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Patent Information
- Application Number
- CN202411291525.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-14
- Publication Date
- 2025-03-21
- Estimated Expiration
- 2044-09-14
AI Technical Summary
Technical Problem
The existing grid-connected inverters have low voltage gain during photovoltaic grid-connected hydrogen production process, and there are leakage current problems, which affects the power quality of the grid.
Method used
It adopts a dual three-port three-level boost circuit and an interleaved parallel dual-coupled inductor structure to achieve high voltage gain and suppress leakage current by alternately controlling the boost unit and interleaved control method.
Benefits of technology
It improves voltage gain, reduces DC bus voltage ripple and device voltage stress, extends the service life of the inverter, effectively suppresses leakage current, and improves the power quality of the grid.
✦ Generated by Eureka AI based on patent content.
Abstract
The present invention discloses a three-level DC-AC inverter suitable for photovoltaic grid-connected hydrogen production, including: a first transformer and a second transformer, used to convert the direct current outputted by a photovoltaic direct current power supply into alternating current; a clamping circuit, connected to the primary coils of the first transformer and the second transformer, used to clamp the voltage of the primary coils of the first transformer and the second transformer, wherein the primary coils of the first transformer and the second transformer are connected in parallel and respectively connected to the photovoltaic direct current power supply; a three-level conversion circuit, connected to the secondary coils of the first transformer and the second transformer, used to boost and convert the alternating current outputted by the secondary coils of the first transformer and the second transformer into three-level alternating current, wherein the secondary coils of the first transformer and the second transformer are connected in series; and a grid-connected control circuit, used to connect the three-level alternating current outputted by the three-level conversion circuit to the hydrogen production grid. The present invention has high gain and can suppress the generation of leakage current.
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