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Theses

Control of multicellular power converters for microgrids and renewable energies applications

Abstract : The interleaved multicell DC-DC power converters are broadly used in many applications and systems especially in renewable energy systems and microgrids. They reduce the current ripple at the input and output side. Also, an implemented magnetic coupling between cells leads to reduce the current ripple in each of them and to improve the dynamical electrical behavior. These properties involve a reduction on the filtering requirements and so, allow to improve the converter compactness as well as its conversion efficiency. Nevertheless, for such power converters, the control complexity is also increased as well as the number of required sensors.The thesis aims to establish different mode of control of interleaved multicell DC-DC converters. The common point of these methods is to control the external quantities at the output of the converter but also the internal quantities, constituted by the circulating currents between parallel cells or in other words the differential currents. Three main strategies are investigated: the first one uses classical linear controllers with different decoupling technics and focuses on the robustness regarding the system parameters variations. The second one uses a Model Predictive Control technic which is designed to provide a fix switching frequency and interleaving of the cells PWM commands. The last one presents a space vector direct control of the differential currents.In a last part, these control principles are tested on a prototype and implemented on a Microcontroller and FPGA board in order to carry out an experimental verification.
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https://tel.archives-ouvertes.fr/tel-01866718
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Submitted on : Monday, September 3, 2018 - 3:45:07 PM
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  • HAL Id : tel-01866718, version 1

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Khaled Tamizi. Control of multicellular power converters for microgrids and renewable energies applications. Electric power. Université Paris Saclay (COmUE), 2018. English. ⟨NNT : 2018SACLS212⟩. ⟨tel-01866718⟩

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