Eric Semail

Control structures for multi-machine multi-converter systems with upstream coupling

A multi-machine multi-converter system formalism has been proposed to describe systems composed of several electrical machines and converters. This description points out coupling elements, which have to distribute energy. Control structures have already been proposed for systems with downstream coupling. This paper is focused on control structures for systems with upstream coupling. Several solutions can be found by moving control blocks.

Fault-tolerant operation of an open-end winding five-phase PMSM drive with inverter faults

Multi-phase machines are known for their fault-tolerant capability. However, star-connected machines have no fault tolerance to inverter switch short-circuit fault. This paper investigates the fault-tolerant operation of an open-end five-phase drive, i.e. a multi-phase machine fed with a dual-inverter supply. Inverter switch short-circuit faults are considered and handled with various degrees of reconfiguration. Theoretical developments and experimental results validate the proposed strategies.

Five-Phase Version of 12Slots/8Poles Three-Phase Synchronous Machine for Marine-Propulsion

This paper proposes a simple and effective scheme for Direct Torque Control (DTC) of Brushless DC Motor. Unlike the traditional DTC where both the torque and flux must to be employed in order to deliver the switching table for the inverter, the proposed DTC scheme utilizes only the torque information. By considering the particular operating principle of the motor, the instantaneous torque can be estimated only by using back EMF ratio in an unified differential equation. The simulation results have shown the good performance of the proposed scheme. It can be seen thus a very suitable technique for EV drives which need fast and precise torque response.

Analytical optimal currents for multiphase PMSMs under fault conditions and saturation

An original analytical expression is presented in this paper to obtain optimal currents minimizing the copper losses of a multi-phase Permanent Magnet Synchronous Motor (PMSM) under fault conditions. Based on the existing solutions [i]opt1 (without zero sequence of current constraint) and [i]opt2 (with zero sequence constraint), this new expression of currents [i]opt3 is obtained by means of a geometrical representation and can be applied to open-circuit, defect of current regulation, current saturation and machine phase short-circuit fault. Simulation results are presented to validate the proposed approach.

Power hardware in the loop simulation of wind farm contribution to grid frequency control

This paper aims to evaluate experimentally the capability of variable speed wind turbine to contribute to primary frequency control. Emphasis on isolated power system is performed by considering the French Guadeloupe island as a technical case study. The experimental work is based on the Power Hardware In the Loop (PHIL) method. A wind farm is emulated by equipments with reduced scale and is connected to a real-time simulator simulating the Guadeloupe power system via a reversible power amplifier. Two different scenarios have been tested. Comparison demonstrates that variable speed wind turbine can provide a significant support to primary frequency control.

Integrated Traction/Charge/Air Compression Supply Using Three-Phase Split-Windings Motor for Electric Vehicles

High cost, no-ideal driving range, and charge time limit electric vehicle market share. Facing these challenges, an integrated motor drive/battery charger system has been proposed by Valeo. A further advancement, based on this system, is present in this paper; for the first time, the integration of traction, charging, and air-compressor supply modes is proposed and tested by real-time experimentation. This integrated system is expected to increase the vehicle component compactness and power, therefore potentially reducing the cost and battery charging time. An overall and unique control scheme is detailed to achieve the three main operating modes: traction, charging, and air-compressor supply modes. The real-time experimentation results show the system feasibility.