Full
Outline
The multi-pulse rectifier technology has advantages such as simple realization, low cost and high reliability, and it has been widely applied in high-power rectifier systems. Based on the topology of a traditional D-type 18-pulse autotransformer, a triangle is added to connect the primary side to form an isolated 18-pulse rectifier transformer, which is further used in a DC distribution system. Its circuit, working principle, output DC voltage and input current harmonics are analyzed theoretically in detail. In addition, the software Ansys-Maxwell is used to perform equivalent modeling of the transformer, and the reliability of simulation results is verified by a comparison with the theoretical analysis. Two methods of leakage flux method and short-circuit experiment are used to solve the primary-side leakage inductance of the transformer. The input current harmonics of the transformer are analyzed in depth, and the influence of transformer leakage inductance on the suppression of input current harmonics is also discussed.
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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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