DEVICE FOR CONTROLLING A POLYPHASE INVERTER

摘要

The device according to the invention controls a polyphase inverter (10, 14, 17) intended for powering from a DC current source (CC) a polyphase rotating electric machine (1). The device is of the type of those generating commutation functions driving commutation elements (9, 13) of the inverter in such a way as to obtain a reduction of the losses in the commutation elements and a decrease of an effective current in a decoupling capacitor (16) of the source (CC). According to the invention, this reduction and this decrease are obtained by means of a set of control strategies (21, 24) determining the commutation functions by using additional degrees of freedom of the polyphase machine (1) with respect to a three-phase reference machine. The polyphase machine comprises first and second phase windings forming a first three-phase system (2, 3, 4) and a second three-phase system (5, 6, 7) with distinct neutral points (11, 15) offset angularly by a predetermined angle of offset (Θ). The first and second phase windings are linked respectively to three first and three second power arms (8, 12) formed by the commutation elements.

主权项

1. A device for controlling a polyphase inverter for supplying power from a direct current source to a double three-phase rotating electrical machine, said device comprising:
means for generating switching signals controlling switching elements to obtain a reduction of losses in said switching elements and a reduction in an rms current in a decoupling capacitor of said direct current source, said double three-phase rotating electrical machine comprising three first phase windings and three second phase windings forming a first three-phase system and a second three-phase system with separate neutral points offset angularly by a predetermined offset angle, and said first and second phase windings being connected to three first and three second power arms, respectively, formed by said switching elements of said polyphase inverter; means for storing a set of at least two control strategies determining said switching signals; means for acquiring a rotation speed and a power factor of said machine; and means for selecting a current strategy from said set of control strategies as a function of said rotation speed and said power factor.