Abstract
This paper proposed a novel 3×4 matrix converter (MC) for the problem that 3×3 MC can't carry the unbalance load. The added midline bridge connects the neutral point of load. The equivalent AC/DC/AC model is founded and the instance of 3×4 MC with unbalance load is analyzed. The fact that the key of obtained three phases symmetrical output voltage is to control the voltage of neutral point is achieved. Space vector pulse width modulation (SVPWM) of 3×3 MC is inherited and the relationship of SVPWM and space pulse width modulation (SPWM) is analyzed: the SVPWM is an improved space pulse width modulation (SPWM) of adding zero-sequence component to sinusoidal modulation wave. The midline bridge is modulated by SPWM method and the voltage of load's neutral point is controlled to be fitting zero-sequence voltage, which can make output voltage symmetry. The input current is analyzed by switching function method and the expression of lower harmonic current is given. Simulation results are given to verify the feasibility of 3×4 MC.
| Original language | English |
|---|---|
| Pages (from-to) | 33-39 |
| Number of pages | 7 |
| Journal | Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering |
| Volume | 28 |
| Issue number | 36 |
| State | Published - 25 Dec 2008 |
| Externally published | Yes |
Keywords
- 3×3 matrix converter
- 3×4 matrix converter
- Harmonic
- Space vector pulse width modulation
- Switching function
- Unbalance load
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