Full
Outline
The high common-mode voltage (CMV) generated by pulse-width modulation in a power converter will cause overvoltage on the motor shaft and further lead to the high-frequency high-amplitude current therein, thereby damaging the motor insulation and increasing the electromagnetic interference. To reduce the CMV of a neutral point clamped (NPC) three-level converter, a CMV suppression strategy based on the framework of algebraic modulation was proposed. First, the issue of duty-cycle assignment was transformed into a problem of solving non-homogeneous linear equations. Second, the degrees of freedom for modulation were properly selected to realize the objective of neutral point voltage (NPV) balance. Third, according to the duty-cycle constraints, the offset signals were selected to obtain the final duty-cycle. Finally, the switches in the phase with intermediate voltage values adopted inverse carrier to obtain a new combination of switching states, so as to reduce the CMV. The proposed modulation strategy can be easily implemented without additional controllers. On the premise of ensuring that the NPV of the NPC three-level converter has good balance characteristics, the CMV can be reduced to the range of one-sixth of the DC-side voltage. The effectiveness and feasibility of the proposed modulation strategy were validated 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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