Converter system having an AC/DC converter, and method for operating a converter system

A converter system, comprising:

• an AC/DC converter;
• a series circuit including a braking resistor and a controllable switch connected to a terminal on a direct-voltage side of the AC/DC converter;
• a DC/AC converter, a terminal on a direct-voltage side of the DC/AC converter connected in parallel to the series circuit;
• an evaluation unit adapted to generate a control signal for the controllable switch and including a determination device adapted to determine electric power supplied to the braking resistor;
• a voltage-acquisition device adapted to supply an output signal to the evaluation unit;
• and
• a controller, the determination device adapted to supply an output signal to the controller, the controller adapted to regulate a set value toward the output signal of the determination device, the controller adapted to supply, directly and/or via a limiter, to a parameterizable filter adapted to convey an output signal to a switching element, the switching element adapted to generate an output signal to open and/or close the controllable switch as a function of exceeding and/or undershooting of a threshold value.