DRIVE CHAIN COMPRISING A DOUBLY-FED ELECTRIC MACHINE AND AN INVERTER CONTROLLED ACCORDING TO A LAW LIMITING THE DELIVERED ACTIVE POWER

摘要

The invention relates to a drive chain (16) comprising an electric machine (18) including a rotor (22) and a stator (20), the stator (20) being connected to an alternating grid (12) and having a stator frequency, and a bidirectional system (24) for converting an alternating current into another alternating current. The conversion system (24) is connected between the grid (12) and the rotor (22), and comprises an ac/dc converter (28) connected to the network (12), an inverter (30) connected between the ac/dc converter (28) and the rotor (22), and a device (32) for controlling switches of the inverter (30) according to a control law. The control law is such that the active power exchanged by the inverter (30) with the rotor (22) is essentially always lower than 0.3 times the nominal power of the direct current specifically circulating between the ac/dc converter and the inverter (30), for the frequencies of a target interval of between 0.6 times the stator frequency and 1.4 times the stator frequency.