Full
Outline
With the development of renewable energy, DC microgrids are receiving increasing attention. Dual active bridge (DAB) converters have advantages such as zero voltage conduction and can achieve a high control efficiency, thus playing an important role in DC microgrids. To address the issue of single phase shift control which causes some switching tubes to lose their capability of conducting at zero voltage when the voltage transmission ratio is mismatched, a multi-mode switching method was proposed to achieve zero voltage turn-on across the entire load range. First, the expressions for the effective values of transmission power and inductance current in the internal and external modes of extended phase shift were analyzed and derived. Second, the optimization curves of phase shift ratio and transmission power were obtained through the Lagrange extremum method to ensure that the DAB converter can satisfy switching under full-load range while achieving soft switching in the full range. Finally, a hardware-in-the-loop platform was built to verify the feasibility and superiority of the optimized modulation strategies.
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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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