Stéphan Astier

Interactions Between Fuel Cells and Power Converters: Influence of Current Harmonics on a Fuel Cell Stack

As fuel cells are likely to be used in many future applications, dedicated power converters must be developed and optimized. A thorough knowledge of the fuel cell operation is thus required for power electronics engineers. This paper proposes a theoretical and experimental study of the behavior of a fuel cell stack subject to current harmonics. The fundamental role of the internal double layer capacitor is demonstrated

Compensation of permanent magnet motors torque ripple by means of current supply waveshapes control determined by finite element method

A method for determining the supply current waveshapes for torque ripple compensation in permanent-magnet motors without saliency and damping bars, by means of a finite-element code, is presented. First, a theoretical analysis shows that current waveshapes producing constant torque can be determined. This analysis leads to an expression for the current as a function of the motor EMF (electromotive force) and cogging torque. Several methods, based on finite-element computation of the magnetic field, for computing the cogging torque and EMF are proposed and compared. A special experimental bench for motor torque measurement is used to validate the theoretical results. >

Finite element simulation of electrical motors fed by current inverters

This paper presents a methodology for coupling electrical machines represented by a Finite Element Model and power electronic devices. The technique, based on a time-stepping procedure for the simultaneous solution of the field and the electrical circuit equations, is applied to an inverter current fed permanent magnet motor.

Off-line and On-line Power Dispatching Strategies for a Grid Connected Commercial Building with Storage Unit

With the development of decentralized power sources based on renewable energy, power grids need smarter operations to be run properly. This paper refers to a microgrid with solar panels associated with an energy storage unit connected to the main grid. An off-line optimal dispatching of the storage power flows is proposed in order to minimize energy costs with regards to the daily energy rates. An on-line management strategy is also introduced so as to control in real-time the grid power predicted over the day by the off-line dispatching.