Alstom

Cegelec

Jacques Courault

A multilevel converter structure made up of cells in cascade, each intermediate cell containing two switches, with one pole of each of the two switches forming part of a pair of upstream poles and the other pole of each of the switches forming part of a pair of downstream poles, the pair of downstream poles of an upstream cell being connected to the pair of upstream poles of a downstream cell, the converter structure also having a respective capacitor for each cell, each capacitor being connected between the two poles constituting the pair of downstream poles of its cell. The converter structure is made up of modules, among which at least an intermediate module contains an upstream capacitor element, in addition to two switches corresponding to the switches of an intermediate cell, the capacitance of said capacitor element being a fraction of the capacitance of the cell capacitor of said upstream cell, while a module upstream from said intermediate module contains a downstream capacitor element whose capacitance is a second fraction of the capacitance of the cell capacitor of said upstream cell.

Practical structure for making a multilevel converter

An electric machine control system includes a torque smoothing device including a torque monitoring device connected to the electric machine and supplying torque signals. A smoothing processor receives the torque signals and receives at least one torque reference signal and produces torque smoothing signals. A smoothing generator receives the smoothing signals and supplies smoothing electric power to the machine to make its torque conform to the torque reference.

Growing community of inventors

Veneux les Sablons, France

Jacques Courault