Full
Outline
The operating characteristics of DC-DC converters have a profound impact on the flexible scheduling of distributed resources in active distribution network. A modular combined DC-DC converter based on Buck-LLC integration is proposed for new energy resources access. Through the high isolation resonant power unit, the input is connected in series to provide high voltage withstand capacity while the output is connected in parallel to meet the demand of high power, thus realizing the efficient transmission of high power. The proposed topology adjusts the duty cycle of a series dual Buck circuit to meet the requirements of connecting different medium-voltage DC networks. By introducing an auxiliary inductor, the zero-voltage-switching (ZVS) problem of all the switches in a wide input range is solved, and the energy transmission efficiency is improved. Based on a study on the ZVS boundary conditions for each switch, the auxiliary circuit and control parameters areoptimally designed. Finally, a power unit prototype with 6.25–7.00 kW was designed and fabricated, and experimental results verified the feasibility of the proposed topology, as well as the correctness of the aforementioned working principle and steady-state analysis.
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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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