Full
Outline
To solve the problems of current zero-crossing distortion and midpoint voltage offset in three-phase four-wire Vienna rectifiers, two control methods namely the current zero-crossing distortion suppression and active control of midpoint voltage are proposed. First, for the three-phase four-wire Vienna rectifier, the topology structure and operating principle are analyzed, the causes of current zero-crossing distortion are explained in combination with the commutation path, and a control method to suppress current zero crossing distortion is proposed. Then, the variation of DC-side capacitor voltage is analyzed, and a midpoint voltage active control method based on zero-sequence current injection is given. Finally, experiments are performed to verify the effectiveness of the proposed control method. The experimental results show that with the proposed control method, the Vienna rectifier can eliminate current zero-crossing distortion and achieve midpoint potential balance.
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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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