Full
Outline
The high-power traction inverter allows for a lower switching frequency. To improve the output performance of a system, synchronous space vector pulse width modulation (SVPWM) strategies are usually used in the medium-speed range, and four synchronous modulation strategies with different performances can be flexibly implemented based on the number and positions of sampling points, as well as the sampling point vector action order. Under this background, the basic principle of four synchronous SVPWM strategies is summarized at first, with a focus on the smooth and shock-free switching method between different frequency-division and different modulation strategies. Second, to address the issue of fundamental phase discontinuity between the boundary sampling strategy and other modulation strategies during the switching, a method is proposed to split the original sampling sector and further reassemble into a new sector, which not only achieves phase continuity but also makes the setting of carrier wave ratio more flexible. Finally, the feasibility of the proposed method was verified by simulation and 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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