A new power conversion topology called PUC, as Packed U Cells, is presented in this dissertation. It is very competitive due to the combination of several advantages of concurrent topologies. It is characterized by a reduced impact on the utility supply, a good energetic efficiency and a small number of power switches and passive components. Based on an averaged modelling of the multilevel PUC converters, the proposed control technique allows a nearly sinusoidal line current with a modulating frequency as low as ten times the supply network one. Filters can then be smaller or even avoided which results on a high energetic efficiency and a reduced installation cost.
A detailed comparative study is performed to highlight the cost saving of the PUC topology against existent ones like Flying Capacitors (FC), Neutral Point Clamped (NPC) and classic and hybrid cascaded H-bridges (OC) topologies. Moreover, PUC converters have small physical size which reduces cumbersome of the installation.
An advanced multiband hysteresis technique is also used to control the proposed topology converters as it is detailed in the dissertation. In fact, a six and fourteen band hystérésis controller is presented to draw a nearly sinusoidal current, in both rectifier and inverter modes, and to insure a unity power factor operation even under load changes.
A multilevel converter resulting from the combination of the PUC and NPC topology is also presented. The control technique is designed to allow balanced and regulated output voltages even under sudden load variations and a unity power factor operation.
The proposed topology was verified by simulations using Matlab Simulink environnement and Simpowersystems toolbox. Experimental validation was performed using dSpace DS1103 kit and Matlab Real-Time Workshop (RTW) tool.
| Date | 31 Jan 2011 |
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| Original language | French |
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| Awarding Institution | - École de technologie supérieure
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| Supervisor | Kamal Al-Haddad (Supervisor) |
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Ounejjar, Y. (Author),
Al-Haddad (Supervisor),
31 Jan 2011Student thesis: Doctoral thesis › Doctorate in Engineering: Engineering