OPERATING AN INVERTER FOR COUPLING AN ELECTRIC MACHINE, DESIGNED FOR OPERATION ON AC VOLTAGE, WITH AN AC VOLTAGE NETWORK

摘要

The invention relates to a method for operating an inverter (10, 48, 50) for coupling an electric machine (12, 46) which is designed for operation on AC voltage, with an AC voltage network (16), comprising the steps: - determining a torque -related machine current component composed of electrical machine currents of the electrical machine (12), - detecting an actual value for a magnetic flux, - determining an actual value of a machine torque of the electric machine (12, 46) by linking the detected magnetic flux to the torque-related machine current component, - determining a torque difference between the actual value of the machine torque and a setpoint value of the machine torque of the electric machine (12, 46), - filtering the torque difference by means of a bandpass filter (28) which is tuned to a machine-side natural frequency, - determining a compensation signal (30) by processing a filter output signal (32) of the bandpass filter (28), and superimposing the compensation signal (30) on the network control signal and/or the machine control signal.