| 摘要 |
The invention relates to a method and a device for operating an asynchron ous motor (1) with double feeds, having a stator (1 a) connected to a grid a nd a rotor (1 b) connected to an inverter (6), said inverter (6) being desig ned such that it impresses a target value for an electrical variable in the rotor (1 b). In a method according to the invention, after detecting a trans ient grid voltage change, a target value for the electrical variable determi ned from at least the rotor flux and the stator flux is impressed in the rot or (1 b) such that an active reduction in the torque occurring during the tr ansient grid voltage change is achieved. The target value of the electrical variable is preferably determined from a suitable weighting of the stator fl ux, rotor flux, stator voltage, stator current, rotor current, and, if avail able as a measured variable, stator voltage. In this manner, torque peaks ar e similarly prevented for various types of grid faults, and the maximum time value of the rotor current is optimally reduced, and a rapid return to regu lar operation of the asynchronous motor is made possible. |
