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Theses

Commande des systèmes électriques : machines synchrones et convertisseurs multi-niveaux

Abstract : This PhD thesis aims to the observation and control of multilevel converters and the synchronous machines control. To satisfy the needs of GS Maintenance's customers and for maintenance reasons, a control strategy for a current fed self controlled synchronous machine is validated by experiments tests. The proposed strategy focus on a very low speed because the machine counter electromotive force is insufficient for inverter thyristors switching. Recently, the company proposed for its customers a power converter with medium voltage to keep its place in the speed variation. So, a modern voltage control of the synchronous machine fed by a voltage inverter is proposed and validated by simulation results. Medium voltage operation encouraged the company to choose the multi-level converter. Then, the flying capacitor converter is proposed in this work and a direct control based on the sliding mode theory and the priority principle is designed to guarantee the voltage balance. This control strategy has been generalized for any number of cells of the converter and validated by simulation results for a 7 cells converter. To reduce the cost and complexity of the converter, an adaptive observer floating voltages is proposed by taking into account the switching states of the converter. This observer is then associated with the direct control in closed loop. A test bench of a 3 cells converter is set up in the company. Experimental tests of « observer based direct control » are then conducted on this test bench.
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  • HAL Id : tel-02464825, version 1

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Saber Laamiri. Commande des systèmes électriques : machines synchrones et convertisseurs multi-niveaux. Automatique / Robotique. École centrale de Nantes, 2019. Français. ⟨NNT : 2019ECDN0031⟩. ⟨tel-02464825⟩

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