Abstract: The invention relates to a method for controlling a multi-phase power converter having at least two phase modules (100) comprising valve branches (T1, . . . , T6) having bipolar subsystems (10, 11) connected in series, at low output frequencies (f). According to the invention, a target value (u1 (t), . . . , u6 (t)) of a valve branch voltage overlaps a common-mode voltage (uCM(t)) such that a sum of two valve branch voltages (u1 (t), U2 (t) or U3 (t), U4 (t) or U5 (t), U6 (t)) of each phase module (100) equals an intermediate circuit voltage (Ud) of said multi-phase power converter. In this manner a known converter having a triphase power converter comprising distributed energy accumulators on the grid and load side, or merely on the load side, may be utilized as a drive converter, which may start up from the idle state.

Abstract: A shaft-driven generator system has a generator connected to a converter. An inverter supplies an AC voltage on a network side. The converter and the inverter are linked via a DC link circuit. The inverter has at least two phase modules, which each have an upper and a lower valve branch, which each have a plurality of two-pole sub-systems connected electrically in series. Each sub-system has a unipolar storage capacitor, to which a series circuit of two gate-controlled turn-off semiconductor switches is connected electrically in parallel. Each semiconductor switch has a diode connected antiparallel therewith. Thus, a shaft-driven generator system is obtained that has a DC-link converter as a static frequency converter for complying with the required network feedback and for managing transient operating states.

Abstract: An inverter having three phase modules with an upper valve arm and a lower valve arm having each at least three two-pole subsystems connected in series, which each subsystem having a storage capacitor, is controlled in the event of failure of one or more subsystems by setting the terminal voltage of the failed subsystems permanently to zero, setting the terminal voltage of a corresponding number of fault-free subsystems in corresponding fault-free valve branches likewise to zero, and increasing the capacitor voltages of the fault-free subsystems of the failed valve branches such that their sum is equal to the sum of the capacitor voltages of the subsystems of a corresponding fault-free valve branch, while leaving the control of the fault-free phase modules unchanged. In this way, a symmetrical voltage system with maximum amplitude is obtained at the inverter outputs.

Abstract: A power supply device for a variable rotation speed drive includes a free-running converter connected to a land-based power grid, and an inverter connected to the variable rotation speed drive. A direct-current cable electrically connects the DC side of the converter with the DC side of the inverter. The inverter includes a plurality of phase modules having an upper and a lower valve branches with least two series-connected, two-pole subsystems with distributed energy storage devices. The inverter is located on the seabed in immediate vicinity of the variable rotation speed drive. Signal electronics of the inverter is located on land. In this way, the distance between the power supply on land and the drive on the ocean floor can reach several hundred kilometers, with ocean depths of several kilometers.

Abstract: A converter has a network-side and a load-side power converter that are connected together on the DC side in an electrically conductive manner. An upper and a lower valve branch of each phase module, respectively, of the load-side power converter has at least one two-poled subsystem. At least one multiphase network-controlled power converter is provided as the network-side power converter. In this way, a converter is obtained, in particular an intermediate voltage circuit converter for intermediate voltages, which combines a simple and cost-effective feed circuit on the network side with a modular multilevel converter on the load side.

Abstract: A method for inhibiting a converter having at least two phase modules is disclosed. Each phase module has an upper and a lower valve branch, with each upper and lower valve branch having a plurality of two-pole submodules which are electrically connected in series and each have a unipolar energy storage capacitor, with a series connection of two turn-off semiconductor switches each being connected in parallel with an antiparallel connected diode. With the method, the submodules in an upper and a lower valve branch in each phase module in the converter are controlled to a switching state III, staggered in time. This considerably reduces the voltage load for the converter and a connected polyphase motor, or a connected power supply system.

Abstract: The invention relates to a method for identifying dirt and/or dew on components of a voltage intermediate circuit converter. According to the invention, the temporal curve of a partial discharge pulsed current is detected at least during a precharging process of an intermediate circuit capacitor of the voltage intermediate circuit converter comprising at least one capacitor, wherein a frequency spectrum is calculated from said current pulse, and wherein depending of the result, a dirt warning and/or a dew warning is activated. Thus, the degree of dirt and/or dew of said voltage intermediate circuit converter can be determined at least during a charging process of an intermediate circuit capacitor of a voltage intermediate circuit converter, thereby preventing a breakdown including the consequences thereof.

Abstract: The invention relates to a method for controlling a power converter having at least two phase modules, which each have an upper and a lower valve branch, each having at least three series-connected two-pole subsystems, in the event of failure of at least one subsystem of a valve branch of a phase module. According to the invention, the valve branch (T1, T6) with the failed subsystem (10) is determined, and in each case a subsystem (10) of a valve branch (T1, T6), which corresponds to the faulty valve branch (T1, T6), of any fault-free phase module (100) is driven such that its terminal voltages (UX21) are in each case zero. A polyphase power converter with distributed energy stores (9) is therefore operated with redundancy.

Abstract: A static converter includes a current converter on the three-phase side and a current converter on the single-phase side, which are electrically conductively linked to one another on the DC voltage side, and which are respectively electrically conductively connected on the AC voltage side to a feeding three-phase network and a single-phase receiving network. According to an embodiment of the invention, one network-commutated current converter is provided as the current converter on the three-phase side, wherein the current converter on the single-phase side has two phase modules which are connected in parallel on the DC voltage side and whose current converter branches each have at least one two-pole subsystem. This results in a static converter which is simpler and costs less than a known static converter.

Abstract: An inverter having three phase modules with an upper valve arm and a lower valve arm having each at least three two-pole subsystems connected in series, which each subsystem having a storage capacitor, is controlled in the event of failure of one or more subsystems by setting the terminal voltage of the failed subsystems permanently to zero, setting the terminal voltage of a corresponding number of fault-free subsystems in corresponding fault-free valve branches likewise to zero, and increasing the capacitor voltages of the fault-free subsystems of the failed valve branches such that their sum is equal to the sum of the capacitor voltages of the subsystems of a corresponding fault-free valve branch, while leaving the control of the fault-free phase modules unchanged. In this way, a symmetrical voltage system with maximum amplitude is obtained at the inverter outputs.

Abstract: The invention relates to a method for controlling a converter having at least two phase modules (100) that comprise an upper and a lower valve branch (T1, . . . , T6), each of which is equipped with at least three bipolar systems (10) connected in series, in case at least one subsystem (10) of a valve branch (T1, . . . , T6) fails. In said method, the valve branch (T1, . . . , T6) having the disturbed subsystem (10) is determined, and one subsystem (10) of a valve branch (T1, . . . , T6) of each undisturbed phase module (100) is controlled such that the terminal voltages (UX21) of said subsystems (10) amounts to zero, said valve branch (T1, . . . , T6) of each undisturbed phase module (100) corresponding to the disturbed valve branch (T1, . . . , T6). According to the invention, a subsystem (10) of a valve branch (T1, . . . , T6) of the disturbed phase module (100) is controlled such that the terminal voltage (UX21) thereof equals zero, said valve branch (T1, . . .

Abstract: A power supply device for a variable rotation speed drive includes a free-running converter connected to a land-based power grid, and an inverter connected to the variable rotation speed drive. A direct-current cable electrically connects the DC side of the converter with the DC side of the inverter. The inverter includes a plurality of phase modules having an upper and a lower valve branches with least two series-connected, two-pole subsystems with distributed energy storage devices. The inverter is located on the seabed in immediate vicinity of the variable rotation speed drive. Signal electronics of the inverter is located on land. In this way, the distance between the power supply on land and the drive on the ocean floor can reach several hundred kilometers, with ocean depths of several kilometers.

Abstract: The invention relates to a wind power plant (4) which consists of a nacelle (12) arranged on a tower (14), a rotor (28), a generator (16), a power converter (20) on the generator side, a power converter (22) on the network side and a transformer (26), the two power converters (20, 22) being electrically connected to each other on the DC voltage side, and the power converter (22) on the network side being connected on the AC voltage side to a feeding point (8) of a destination network (6) by means of the transformer (26).

Abstract: A securing element includes a head section and a shank. The cross-section of the shank changes in the axial direction in such a way that, by taking into account a qualitative and/or quantitative predetermined bending torque profile in the shank, the cross-section has a substantially uniform bending stress profile in the shank in relation to a securing element with a constant shank cross-section. An exhaust gas turbocharger having variable turbine geometry includes a VTG-guide vane configuration having at least one such securing element and being secured to a housing component of the exhaust gas turbocharger.

Abstract: The invention relates to a method for controlling a multi-phase power converter having at least two phase modules (100) comprising valve branches (T1, . . . , T6) having bipolar subsystems (10, 11) connected in series, at low output frequencies (f). According to the invention, a target value (u1 (t), . . . , u6 (t)) of a valve branch voltage overlaps a common-mode voltage (uCM(t)) such that a sum of two valve branch voltages (u1 (t), U2 (t) or U3 (t), U4 (t) or U5 (t), U6 (t)) of each phase module (100) equals an intermediate circuit voltage (Ud) of said multi-phase power converter. In this manner a known converter having a triphase power converter comprising distributed energy accumulators on the grid and load side, or merely on the load side, may be utilized as a drive converter, which may start up from the idle state.

Abstract: A turbocharger with a variable turbine geometry, includes at least one rolling body element respectively disposed on an associated fixing element for the variable turbine geometry. A device for adjusting the variable turbine geometry can roll off on the respective rolling body element.

Abstract: A vane grille arrangement of an exhaust gas turbocharger with variable turbine geometry, contains at least one carrier ring formed from at least one sheet metal part and used to mount VTG guide vanes, the VTG guide vanes being rotatably mounted in recesses of the carrier ring. Ideally, an exhaust gas turbocharger has such a variable turbine geometry.

Abstract: A converter has a network-side and a load-side power converter that are connected together on the DC side in an electrically conductive manner. An upper and a lower valve branch of each phase module, respectively, of the load-side power converter has at least one two-poled subsystem. At least one multiphase network-controlled power converter is provided as the network-side power converter. In this way, a converter is obtained, in particular an intermediate voltage circuit converter for intermediate voltages, which combines a simple and cost-effective feed circuit on the network side with a modular multilevel converter on the load side.

Abstract: The invention relates to a method for controlling a power converter comprising at least two phase modules, each of which is provided with an upper and a lower valve leg that is equipped with at least two serially connected bipolar subsystems, respectively. According to the invention, the switching actions in the two valve legs (T1, T2; T3, T4; T5, T6) of each phase module (100) of the multiphase power converter having distributed energy stores are performed at a freely selected interval (?TZ) rather than synchronously. The inventive control method for a multiphase power converter having distributed energy stores thus makes it possible to dynamically regulate valve leg currents (i11, i12, i21, i31, i32).

Abstract: The invention relates to a converter circuit comprising at least one phase module (100) having an upper and a lower converter valve (T1, . . . , T6), wherein each converter valve (TI, . . . , T6) has at least one two-pole subsystem. According to the invention, each two-pole subsystem (14) has four semiconductor switches (21, 23, 25, 27), which can be switched off and are connected electrically in series, four diodes (22, 24, 26, 28), which are each connected electrically back-to-back in parallel with one semiconductor switch (21, 23, 25, 27) which can be switched off, two unipolar storage capacitors (29, 30), which are connected electrically in series and in parallel with the series circuit comprising the semiconductor switches (21, 23, 25, 27), and an electronic system (32), whose reference potential connection (M) is electrically conductively connected to a common potential (P0).