Full
Outline
Owing to their advantages such as high efficiency and simple control, Swiss rectifiers show promise in the field of electric vehicle charging. Under conditions of unbalanced power grid, the use of traditional control methods will lead to the generation of even-order harmonics on the DC side and odd-order harmonics on the AC side of a Swiss rectifier, thereby affecting the system operation. On the basis, two control methods for the Swiss rectifier under unbalanced power grid conditions are introduced, i.e., constant output voltage control (COVC) and sinusoidal and symmetrical current control (SSCC). With COVC, the DC voltage remains stable at the cost of negative-sequence current emerging in the input current, which results in a phase difference between the grid voltage and current of the Swiss rectifier. Due to constraints on the topology, this phase difference may lead to grid current distortion. SSCC ensures a symmetrical and sinusoidal current, but significant fluctuations in the DC voltage may exist. To solve these problems, a coordinated control method of suppressing current distortion control (SCDC) is proposed, which can realize sinusoidal input current throughout the entire grid voltage drop range while minimizing the fluctuations of active power. The effectiveness of the SCDC method was verified by experimental results.
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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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