Ge Energy Power Conversion Gmbh

Ge Energy Power Conversion Technology Gmbh

Alstom

Converteam Gmbh

Alstom Power Conversion Gmbh

Roland Jakob

Martin Geske

Thomas Brueckner

David Rudniski

Piotr Sadowski

Georg Beinhold

Thomas Basler

Joerg Janning

Christoph Saniter

Marco Boni

Samir Salama

Jörg Janning

Thomas Brückner

Hans-J&uuml;rgen Ehler

Andreas Pelz

Michael Fernahl

Guenter Junge

Sebastian Hildebrandt

Josef Lutz

Kowalsky Jens

A device () for the on-demand commutation of an electrical current from a first line branch () to another, second line branch () is created, which has a number of power semiconductor switching elements (), which are arranged in series and/or parallel to one another in the second line branch (), and a control unit () for controlling the number of power semiconductor switching elements (). The control unit () is adapted to apply to each of the number of power semiconductor switching elements () an increased control voltage (VGE) whose level is above the maximum permissible control voltage specified for continuous operation, in order to switch on or maintain the conduction of the number of power semiconductor switching elements and to cause an increased current flow through it, whose current rating is at least double the nominal operating current. The control unit () is further adapted to switch off the number of power semiconductor switching elements after a respectively provided short switch-on duration by switching off the control voltage (VGE) again while they conduct an increased current flow. The device () can thus be designed for a higher power in operation, or, at a given operating power, the semiconductor area and size of the device () can be reduced.

Device for temporarily taking over electrical current from an energy transfer or distribution device, when needed

A switch module includes a collector connection, an emitter connection, and a gate connection. The switch module includes a plurality of parallel connected switching elements, e.g., insulated-gate bipolar transistors, each having a collector electrode electrically connected to the collector connection, an emitter electrode electrically connected to the emitter connection, and a gate electrode electrically connected to the gate connection. A fault protection device is operatively electrically connected between the gate connection and the switching elements and comprises passive electrical components which are selected such that in the event of a fault in at least one of the plurality of switching elements, a gate-emitter voltage is provided to the gate electrodes of non-faulty switching elements in a passive manner.

Circuit arrangement and method for gate-controlled power semiconductor devices

A short-circuit device and a protection method for a submodule for a power converter are disclosed. The submodule includes a bridge circuit having at least one power semiconductor branch extending between a first and a second DC voltage node and at least one controllable power semiconductor switch disposed therein to which a freewheeling diode is connected in anti-parallel, and a capacitor connected in parallel to the bridge circuit. The short-circuit device has at least one selected of the freewheeling diodes anti-parallel to the power semiconductor switches of the bridge circuit, wherein the at least one selected freewheeling diode is manufactured in press pack design and rated such that, when a fault occurs in the submodule, the at least one selected freewheeling diode breaks down due to the fault conditions and provides a durable, stable, low-impedance short circuit path between a first and a second AC voltage connection of the submodule.

Converter submodule with short-circuit device and power converter having same

A circuit arrangement connected to an electrical circuit including a transformer with primary winding connected to the electric power grid and secondary winding connected to a power converter with a capacitor, the circuit arrangement has a primary winding coupled to the auxiliary winding, which is connected to a switching device.

Circuit arrangement for connection to an electrical circuit and electrical circuit

A method for operating an electrical circuit is described herein. The circuit includes a power converter having a plurality of switches and two capacitors that are parallel to the switches. The plurality of switches and the two capacitors are connected in series. The power converter has two AC voltage-sided connections and a measuring resistor is connected to the ground. A ground fault is detected by measuring a voltage drop in a measuring resistor.

Procedures for the operation of an electrical circuit

A method for operating an electrical circuit is described. The electrical circuit is equipped with a power converter () that has at least one series connection () consisting of at least four power semiconductor elements. The electrical circuit is equipped with at least one capacitor (Cd, Cd) connected in parallel to the series connection (). In the power converter (), at least one resistor has been connected in parallel to the middle two power semiconductor elements. In the method, at least one of the power semiconductor elements is conductively connected and in this way a discharging current is generated from the capacitor (Cd, Cd) through the conductively connected power semiconductor element and the resistor.

A method for operating an electrical power rectifier. The power rectifier comprises at least two branches that are connected in parallel to each other, each of the branches comprising at least two power semiconductor elements that are connected in series. The collector-emitter voltage Vce(t) and/or the collector current Ic(t) of one of the power semiconductor elements is detected by means of the method. Furthermore, it is determined whether at least one of the following conditions is met: dVce(t)/dt&#x3c;(dVce/dt), and/or dIc(t)/dt&#x3c;(dIc/dt), and or Ic(t_ent)&#x3c;Ic. If at least one of the aforementioned conditions has been met, the gate-emitter voltage of at least one of the power semiconductor elements is increased.

Method for operating an electrical power rectifier, as well as an electrical power rectifier

An electrical circuit for a power converter is described. The circuit has been provided with several semiconductor switches and capacitors used for operating the power converter. A brake resistance for lowering energy is provided and is connected to the semiconductor switches provided without the need for an additional switch. The operation of the power converter and the current flowing through the brake resistance can be controlled by means of the existing semiconductor switches.

Multipoint converters with brake chopper

Disclosed is an electric circuit, in particular for a medium voltage power converter. The circuit has at least four semiconductor switches which form a series connection and which are connected to poles of a direct current voltage (Ud). A diode is connected in parallel in an inverse direction to each semiconductor switch. A capacitor is connected in parallel to the two semiconductors in the middle of the series connection. The circuit is provided with a pole of an output potential (Ua) which is connected centrally in the series connection. The circuit has a control device for successively controlling the semiconductor switches. The time interval between the transition of two of the semiconductor switches into their respective controlling states is minimal.

Electric circuit, in particular for a medium-voltage power converter

An energy supply unit includes a primary coil which is at least indirectly connected to an energy source. In a secondary coil which is at least indirectly connected to the control circuit, and an insulating section formed between the primary coil and the secondary coil. The auxiliary energy is transmitted via the insulating section by way of a magnetic alternating field. The energy supply unit further includes a first carrier plate, a primary coil embodied as a flat coil situated on the first carrier plate, a second carrier plate, and a secondary coil embodied as a flat coil situated on the second carrier plate. The insulating section is embodied as an interferric space formed between the primary coil and the secondary coil.

Energy supply unit for transmitting auxiliary energy to an electrical device

A power converter includes at least one capacitor and at least two semiconductor power switches. Each capacitor includes a pair of connectors for connecting the capacitor to the at least two semiconductor power switches. Moreover, each capacitor includes at least one other pair of connectors in order to connect the capacitor to at least two semiconductor power switches or a direct current network.

Modular power converter

A device for carrying high currents at a low inductance, in particular for a power converter or the like, is provided with two flat electrical conductors which are arranged roughly parallel to each other and are spaced apart from each other. The space between the two conductors contains no transition from one of the two conductors to a solid-state insulator, and from there to the other of the two conductors. As a result, no aging phenomena can arise in the device according to the invention owing to partial discharges.

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Berlin, Germany

Roland Jakob