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SVPWM for Small Fluctuation of Neutral Point Current in High Index Modulation Region of the Three-level Inverter
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| Author(s) |
R.-Y. Kim; Y.-H. Lee; D.-S. Hyun |
| Abstract |
The diode clamped three-level VSI has been widely used in high-capacity high-performance AC drive applications. There exists an inherent problem that is the variation of neutral point voltage in dc link capacitor bank of three-level inverter. This paper describes the analysis of the neutral point current of the diode clamped three-level inverter and the improved space-vector based PWM strategy to consider the switching frequency and to minimize the neutral point current in spite of high modulation index region and low power factor. It contributes to decrease the capacitance of dc link capacitor bank and to increase the neutral point voltage controllable region. Especially, even if second (or even) order harmonic is induced in load current (at this situation, it was investigated that the general control method can not suppress the neutral point voltage variation), this PWM can provide effective control method to supress the neutral point voltage variation. Various simulation results by means of Matlab/Simulink are presented to verify the proposed PWM. |
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| Filename: | EPE1999 - PP00325 - Kim.pdf |
| Filesize: | 238.7 KB |
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| Type |
Members Only |
| Date |
Last modified 2004-04-07 by System |
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