Abstract
The three-phase four-switch inverter is being attached much importance as a fault-tolerant topology for traditional six-switch scheme, but its performance is lower than the latter. Based on analysis of the operation principle of four-switch inverters, space vector pulse width modulation (SVPWM) was studied and its essence was posted, that is a sinusoidal pulse width modulation (SPWM) using a triangle wave and two implicit sine waves whose phases are separated by 60° electrical angle. To reduce the number of power device switching, the implementation method of four-switch SVPWM with seven-segment scheme was presented. The maximal linear modulation ratio of four-switch SVPWM is half of the one in six-switch scheme, which is indicated as a conclusion. A compensatory voltage vector based overmodulation method for four-switch SVPWM was presented for improving the utilization ratio of the DC voltage. The simulation results as well as experimental ones illustrate the validity and efficiency of the proposed algorithm.
| Original language | English |
|---|---|
| Pages (from-to) | 14-20 |
| Number of pages | 7 |
| Journal | Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering |
| Volume | 30 |
| Issue number | 3 |
| State | Published - 25 Jan 2010 |
Keywords
- Fault-tolerant
- Four-switch inverter
- Modulation function
- Overmodulation
- Space vector pulse width modulation
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