Method and apparatus for operation of a converter circuit having plural phase modules and sub-converter systems for the phase modules

摘要

A method is provided for operation of a converter circuit. The converter circuit has at least two phase modules, where each phase module has a first and a second sub-converter system, and the sub-converter systems for each phase module are connected in series with one another. Each sub-converter system includes a plurality of series-connected two-pole switching cells. In the method, the control signals for the switching cells are additionally formed from a damping signal. The damping signal is formed from a measured current through the respective sub-converter system and from a predeterminable resistance value, in order to attenuate undesirable currents in the sub-converter systems.

主权项

1. A method for operation of a converter circuit, wherein the converter circuit has at least two phase modules, each phase module having a first sub-converter system and a second sub-converter system, the sub-converter systems for each phase module being connected in series with one another, each sub-converter system including a plurality of series-connected two-pole switching cells, and each switching cell having controllable bidirectional power semiconductor switches with a controlled unidirectional current-flow direction and a capacitive energy store, the method comprising:
controlling the power semiconductor switches in the switching cells in the first sub-converter system by means of a first control signal; controlling the power semiconductor switches in the switching cells in the second sub-converter system by means of a second control signal; forming the control signal for the first sub-converter system formed from a reference signal with respect to the voltage across the first sub-converter system; and forming the second control signal for the second sub-converter system from a reference signal with respect to the voltage across the second sub-converter system, wherein the first control signal is additionally formed from a first damping signal with respect to the first sub-converter system, the first damping signal being formed from a measured current through the first sub-converter system and from a predeterminable resistance value, and wherein the second control signal is additionally formed from a second damping signal with respect to the second sub-converter system, the second damping signal being formed from a measured current through the second sub-converter system and from the predeterminable resistance value.