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Feedback Control of the Three-Level PWM Rectifier: Application to the Stabilisation of the DC Voltages of a Multilevel Inverter
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| Author(s) |
Farid Bouchafaa, El-Madjid Berkouk, Mohamed Seghir Boucherit, Bruno Francois |
| Abstract |
A serious constraint in a multilevel inverter is the
capacitor voltage-balancing. In order to stabilize these DC
voltages, we propose to study the cascade constituted by a
three phase three-level PWM rectifier, a clamping bridge
and a nine level NPC voltage source inverter (VSI). In the
first part, the authors present the topology of the nine-level
NPC and they propose a model of this converter and the
algebraic PWM strategy to control it. Then in the second
part, we study the three-level PWM rectifier, which is
controlled by a hysteresis strategy. In the last part of this
paper, the authors study the stability problem of the input
DC voltages of the inverter. Clamping bridges are used to
control each DC capacitor voltage. To control the full DC
bus voltage a closed loop control is implemented inside the
control system of the rectifier. The obtained results are full
of promise to use the inverter in high voltage and great
power applications as for electrical traction. |
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| Filename: | T3-121.pdf |
| Filesize: | 793 KB |
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| Type |
Members Only |
| Date |
Last modified 2007-03-08 by System |
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