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This paper presents a new modulation for modular multilevel converters (MMC) based on a simple idea, which is very easy to implement. It consists of playing with the relative behaviour of each phase in order to obtain the desired AC voltage. This method also assures that the voltage capacitor in each sub-module remains constant. Moreover, this converter allows the operation of the system under unbalanced...
This paper describes the analysis and the optimisation of an active shielding. The shield is designed for space application. A comparison of the performances of two magnetic shields is first used to have a point of comparison. The second shield is 2 times thicker than the first. A Finite Element Analysis of the cylindrical metallic shield in a 1 Gauss flux density is performed in 2D. An active shielding...
This paper aims at comparing the performances of induction and synchronous reluctance machines considering the driving cycle. The analytical models of the two machines are proposed and validated. The geometries and the electrical controls of these machines are used to define the total energy losses during the driving cycle. The methodology of the global optimization is also presented in this paper.
The benefit of a hybrid system is strongly dependant on the system design and the control strategy that will be used. This paper suggests a method to evaluate the optimal control strategy of a hybrid electrical system to optimize its design from the point of view of fuel consumption taking into account this interaction. Analytic models are used to describe the system and the interactions between components...
Nonlinear loads produce harmonic currents, which induce additional losses in transformers and cause temperature rise, especially in the windings. The estimation of winding eddy-current loss, in the presence of harmonics, is based on the knowledge of winding eddy-current loss at power frequency. This paper deals with the transformer winding loss estimation and gives a simplified winding resistance...
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