Full
Outline
The dual active bridge (DAB) microinverter employs a transformer for isolation and step-up before connecting to the grid through bidirectional switches and cycloconverter operation. In comparison to other microinverter solutions, this design boasts numerous advantages, including high conversion efficiency, a broad soft-switching range, a reduced number of power conversion stages, and the ability to provide reactive power support. First, in terms of circuit modulation and control, the circuit topology and switching stages of the DAB DC-AC converter are thoroughly analyzed, a time-domain model is established, the range of transmitted power and soft-switching range are provided, and a feasible closed-loop control framework is proposed. Then, for hardware design, the primary passive components of the DAB microinverter include transformers and inductors. To further enhance power density, a magnetic integration design for transformers and inductors is introduced. By constructing additional magnetic paths on the microinverter transformer, the inductance value of the integrated inductor can be flexibly adjusted, significantly reducing the volume of magnetic components. Finally, a 450 W experimental prototype was built, and experiments were conducted to validate the effectiveness and feasibility of the proposed modulation strategy and magnetic component design method.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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