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Direct modulation of electrical conversions for a multilevel chopper
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| Author(s) |
B. François; C. Saudemont; M. Fadel |
| Abstract |
In this paper the methodology of the Causal Ordered Graph (COG) is used for the modelling of a flying
capacitor cell chopper. The issues of this study is a best understanding of the operating of this particular
converter in order to obtain a more precise design of the control system. The obtained modelling shows
that high-voltage multi levels are obtained by combination of two different three-level functions
(conversion functions). Therefore a novel PWM strategy is deduced. It consists of separating the
modulation period for creating two fictive modulated voltages via the direct width modulation and the
position setting of both conversion functions. Therefore, the durations of electrical conversions can be
precisely calculated and directly processed by modulators. The redundancy of the different switches
configurations for the voltage half value allows to use a particular modulation technique which limits
the deviations of the half-value voltage. Switching patterns are deduced and a decoupling control of the
capacitor voltage and the supply current is designed. |
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| Filename: | EPE2001 - PP00344 - Francois.pdf |
| Filesize: | 248.1 KB |
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| Type |
Members Only |
| Date |
Last modified 2004-03-11 by System |
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