Pierre Lefranc

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This work consists of the presentation of a regulation strategy capable of controlling the energy stored in the DC capacitors of the upper and lower arms of a Modular Multilevel Converter (MMC) for each phase. This is achieved by regulating the positive, negative and zero sequences in dqo coordinates of the differential current using a rotating reference(More)
This paper presents an invariant sets technique for feedback law synthesis, in order to control a Buck DCDC converter. For the linear discrete-time system affected by perturbations and constraints, the proposed method gives the best feedback gain in terms of finding the maximal invariant ellipsoid. As a result of this technique, the maximal ellipsoid is(More)
This paper presents the application of fixed frequency (or indirect) Sliding Mode Control (SMC) to the DC-DC Single-Ended Primary Inductor Converter (SEPIC) where the switching frequency is in the range of hundreds of kHz and consequently a FPGA is required. Due to the constraint of FPGA, only the output voltage is measured. As the proposed SMC requires the(More)
This paper presents the application of fixed frequency (or indirect) Sliding Mode Control (SMC) to the DC-DC Single-Ended Primary Inductor Converter (SEPIC) which can operate in both step-up and step-down modes. Simulation and experimental studies are conducted. Two laboratory prototypes have been made: one with a switching frequency of 20kHz uses a DSP(More)
This paper deals with an optimization approach of a three-phases inverter associated to a bus capacitor filter and a heatsink. This approach considers multi-technology components and a power semiconductors generic modelling. The optimized choice is performed with a Genetic Algorithm (GA) with the help of components databases for the semiconductors,(More)
The aim of this paper is to perform an optimal design of a surface mounted PMSM, dedicated to an embedded application, based on a multiphysic modelling and using a genetic algorithm. Finally, a quantitative criterion, regarding the torque ripple, is introduced to choose the switching frequency of the power electronic supply.
The Interconnection and Damping Assignment Passivity-Based Control (IDAPBC) is applied phase-independently to the Modular Multilevel Converter (MMC) in order to overcome “dqo”-based control problems. In addition, an equilibrium point estimator is proposed to determine the time-varying equilibrium state of the MMC needed as input for the(More)
In a recent paper a procedure to design globally asymptotically stabilizing linear proportional plus integral controllers for switched power converters was proposed. The construction requires the measurement of the full state of the system, which is often unavailable in practice. In this note we identify a class of converters for which an asymptotically(More)