CONVERTER SYSTEM HAVING AN AC/DC CONVERTER, AND METHOD FOR OPERATING A CONVERTER SYSTEM

In a converter system having an AC/DC converter, and a method for operating a converter system, in which the terminal of the AC/DC converter on the direct-voltage side feeds a series circuit, which has a braking resistor and a controllable switch, the terminal of a DC/AC converter, in particular an inverter, on the direct-voltage side being connected in parallel to the series circuit. The output signal of a voltage-acquisition device is supplied to an evaluation unit, which generates a control signal for the controllable switch. The evaluation unit includes a device for determining the electric power supplied to the braking resistor, in particular from the intermediate circuit, which is determined by the device from the output signal of the voltage-acquisition device, in particular. The output signal of the device is supplied to a controller, in particular a linear controller, and the controller controls its set value toward the output signal of the device. The controller in particular has a linear controller element, in particular a PI controller element or integration element, whose set value, i.e. whose output signal, is forwarded to a difference generator for determining the difference between the set value and the value of the electric power, the set value being supplied, directly or via a limiter, to a parameterizable filter, whose output signal is supplied to a switching element, which in particular generates an output signal for opening or closing the controllable switch as a function of the exceeding or undershooting of a threshold value.