Abstract: A method for controlling a plurality of power converters connected to a power supply network is described. Each power converter includes high-power semiconductor devices. Control signals are sent between a controller and a wireless node of one or more of said plurality of power converters using a wireless communication system. The control signals are transmitted to a local wireless node of one or more of a plurality of power converters. The data transmissions include data packets including control information such that a clock of the local wireless node can be synchronized using time synchronization information of the wireless communication system. In other aspects of the invention a system employing the method and a computer program for carrying out the method are described.

Abstract: Exemplary embodiments are directed to a method for operating a converter, wherein the converter includes a plurality of bridge branches having one or more switching cells connected in series. Each bridge branch connects one of a plurality of inputs to one of a plurality of outputs of the converter. The method includes monitoring each of the switching cells in order to determine a fault. If a fault is identified in one of the switching cells, triggering one of the triggering elements for short-circuiting switching cell connections if the fault identified in the switching cell is not followed by identification of a fault in a further one of the switching cells within a predetermined period of time.

Abstract: A method and apparatus are provided for operating a converter circuit, which includes n input phase connections and p output phase connections, where n?2 and p?2, and (n·p) two-pole switching cells for switching at least one positive and negative voltages between the poles. Power semiconductor switches of the switching cells are driven a drive signal. To reduce undesired circulating currents and adjust the mean voltage deviation of capacitive energy storage of all the switching cells to zero, an inductance is connected into each series connection, with a switching cell together with an inductance in each case forming a phase module. For each phase module, the drive signal is formed from a reference signal based on the voltage across the phase module and from a voltage signal across the inductance. The voltage signal is formed from an intermediate setpoint value of the current through the phase module.

Abstract: 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.

Abstract: A method and apparatus are provided for operating a converter circuit, which includes at least two phase modules each having first and second subconverter systems, which include power semiconductor switches. The switches of the first and second subconverter systems are driven by first and second drive signals, respectively. To enable dimensioning a capacitive energy store of the converter circuit to be independent of a desired current at an output connection of the converter circuit, for each phase module, the first and second drive signals are respectively formed from a voltage signal across inductances and a switching function for the switches of the first and second subconverter systems, respectively. The switching functions are formed by a voltage signal corresponding to the voltage at the output connection and a selectable reference signal. The voltage signals are selected to be in phase with the voltage at the output connections of the phase modules.

Abstract: A method and device for operating a direct converter circuit are provided. A control signal controls power semiconductor switches of switching cells of the associated phase module. The control signal is formed, for each phase module, from the difference between a reference signal relating to the voltage over the phase module and a voltage signal over the inductor. The voltage signal over the inductor is formed from a reference signal relating to the current through the corresponding phase module. The reference signal relating to the current through the phase module is formed from a respective mean value or instantaneous value of a phase power of a phase of the first and second current or voltage systems connected to the phase module and from respective sums of the instantaneous values or the mean values of the phase powers of the phases of the first and second current or voltage systems, respectively.

Abstract: A direct converter includes n input phase connections and p output phase connections, where n?2 and p?2. The direct converter also includes (n·p) two-pole switching cells for switching at least one positive voltage and at least one negative voltage between the poles. Each output phase connection is connected in series with each input phase connection, respectively, via a switching cell. To enable any desired and continuous current flow setting from an input phase connection to an output phase connection of the direct converter and, moreover, to exchange electrical energy between the two-pole switching cells of the direct converter, at least one inductance is connected into each series connection. A system including a direct converter is also provided.

Abstract: A method and apparatus are provided for operating a converter circuit, which includes n input phase connections and p output phase connections, where n?2 and p?2, and (n·p) two-pole switching cells for switching at least one positive and negative voltages between the poles. Power semiconductor switches of the switching cells are driven a drive signal. To reduce undesired circulating currents and adjust the mean voltage deviation of capacitive energy storage of all the switching cells to zero, an inductance is connected into each series connection, with a switching cell together with an inductance in each case forming a phase module. For each phase module, the drive signal is formed from a reference signal based on the voltage across the phase module and from a voltage signal across the inductance. The voltage signal is formed from an intermediate setpoint value of the current through the phase module.

Abstract: A method and device for operating a direct converter circuit are provided. A control signal controls power semiconductor switches of switching cells of the associated phase module. The control signal is formed, for each phase module, from the difference between a reference signal relating to the voltage over the phase module and a voltage signal over the inductor. The voltage signal over the inductor is formed from a reference signal relating to the current through the corresponding phase module. The reference signal relating to the current through the phase module is formed from a respective mean value or instantaneous value of a phase power of a phase of the first and second current or voltage systems connected to the phase module and from respective sums of the instantaneous values or the mean values of the phase powers of the phases of the first and second current or voltage systems, respectively.

Abstract: A method for controlling a plurality of power converters connected to a power supply network is described. Each power converter includes high-power semiconductor devices. Control signals are sent between a controller and a wireless node of one or more of said plurality of power converters using a wireless communication system. The control signals are transmitted to a local wireless node of one or more of a plurality of power converters. The data transmissions include data packets including control information such that a clock of the local wireless node can be synchronized using time synchronization information of the wireless communication system. In other aspects of the invention a system employing the method and a computer program for carrying out the method are described.

Abstract: A method and apparatus are provided for operating a converter circuit, which includes at least two phase modules each having first and second subconverter systems, which include power semiconductor switches. The switches of the first and second subconverter systems are driven by first and second drive signals, respectively. To enable dimensioning a capacitive energy store of the converter circuit to be independent of a desired current at an output connection of the converter circuit, for each phase module, the first and second drive signals are respectively formed from a voltage signal across inductances and a switching function for the switches of the first and second subconverter systems, respectively. The switching functions are formed by a voltage signal corresponding to the voltage at the output connection and a selectable reference signal. The voltage signals are selected to be in phase with the voltage at the output connections of the phase modules.

Abstract: 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.

Abstract: A direct converter includes n input phase connections and p output phase connections, where n?2 and p?2. The direct converter also includes (n·p) two-pole switching cells for switching at least one positive voltage and at least one negative voltage between the poles. Each output phase connection is connected in series with each input phase connection, respectively, via a switching cell. To enable any desired and continuous current flow setting from an input phase connection to an output phase connection of the direct converter and, moreover, to exchange electrical energy between the two-pole switching cells of the direct converter, at least one inductance is connected into each series connection. A system including a direct converter is also provided.