Abstract: A method manages a fault on a DC voltage side of a converter assembly including a modular multistage converter with switching modules having semiconductor switches and an energy store. Some switching modules are a first type and others are a second type. During operation, a positive switching module voltage, negative switching module voltage or zero voltage are generated at terminals of switching modules of the first type, and a positive switching module voltage or zero voltage are generated at terminals of switching modules of the second type. Upon detecting a DC voltage side fault, switching modules of the first type are actuated such that the polarity of their energy store voltages corresponds to the polarity of a fault current, and energy stores of switching modules of the first type are charged to a voltage exceeding their rated voltage. A converter assembly carrying out the method is also provided.

Abstract: A method controls a converter having a plurality of switching modules. Each of the switching modules has controllably interruptible semiconductor switches and an energy store. A switching frequency of the switching modules is regulated in consideration of at least one integral limiting value, wherein the at least one integral limiting value is variably determined over time, in accordance with the energy store voltages of the switching modules.

Abstract: A method regulates a power converter arrangement that has at least one power converter arm with a series circuit of two-pole switching modules. Each of the switching modules contains a plurality of semiconductor switches and an energy store. At least some of the switching modules are switching modules of a first type and at least some further switching modules are switching modules of a second type. In the method, a voltage setpoint value of a power converter regulator is apportioned into a first and a second setpoint value portion. The switching modules of the first type are driven on the basis of the first setpoint value portion and the switching modules of the second type on the basis of the second setpoint value portion.

Abstract: A converter configuration has a converter. The AC voltage side of which can be connected to an AC voltage grid and the DC voltage side of which can be connected to a storage configuration. The converter has a plurality of converter arms, which each have a series circuit of semiconductor switching modules, and the storage configuration is arranged in parallel with at least one of the converter arms. The storage configuration contains a multiplicity of series circuits of individual energy storage modules. Each series circuit extends between a first and a second DC voltage busbar such that the series circuits are connected in parallel with one another. The converter configuration further has a balancing apparatus for balancing energy storage module voltages of the energy storage modules. The balancing apparatus contains balancing lines, which connect individual energy storage modules of different series circuits to one another.