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In order to solve the problem of large peak-to-peak inductor currents in dual active bridge converters with mismatched input and output voltages，a four-degree-of-freedom modulation（FDFM） strategy was proposed by combining symmetric duty cycle modulation and asymmetric duty cycle modulation. By analyzing the operating modes of the four-degree-of-freedom modulation strategy，the peak-to-peak inductor current and transmission power models were established，and the optimal solution with different transmission powers was solved by using the Karush-Kuhn-Tucker（KKT） condition with the peak-to-peak inductor current as the optimization objective. And the experimental prototype was built to verify the effectiveness of the proposed strategy. The experimental results show that the proposed modulation strategy can effectively reduce the peak-to-peak inductor current of the converter and improve the efficiency of the dual active bridge converter.
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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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