Abb Schweiz Ag

Asea Brown Boveri Ag

Abb Research Ltd.

Jürgen Steinke

Peter Karl Steimer

Srinivas Ponnaluri

Thierry Meynard

Christian Stulz

Jochen Rees

Arthouros Iordanidis

Luc Meysenc

Peter Barbosa

Michael Weiss

Erika De-Candido

Bogdan Cranganu-Cretu

Roger Lüscher

Irene Gardoni

Bjørn ØDEGÅRD

An exemplary power-electronic switching system has a plurality of switching units, wherein each switching unit includes a housing and at least one switching module which is arranged within the housing. A mounting unit has a holding apparatus, on which the housings of the switching units are arranged. The holding apparatus includes an insulation material for electrically insulating the holding apparatus from the housings of the switching units and the housings of the switching units from one another. The insulation material allows the housings of the switching units of the switching system to have different voltage potentials from one another and additionally can be realized in a simple and space-saving manner and easily be assembled. In addition, the housing of each switching unit includes a material for at least partially shielding an electric and magnetic field.

Power electronic switching system

A method for operation of a converter circuit is specified, wherein the converter circuit has a converter unit with a multiplicity of drivable power semiconductor switches and an LCL filter which is connected to each phase connection of the converter unit, in which method the drivable power semiconductor switches are driven by means of a drive signal which is formed from reference voltages. The reference voltages are formed by subtraction of damping voltages from reference-phase connection voltages, with the damping voltages being formed from filter capacitance currents, weighted with a variable damping factor of the LCL filter. An apparatus for carrying out the method is also specified.

Method for operation of a converter circuit, as well as an apparatus for carrying out the method

A converter circuit having a first and a second converter element is specified, with each converter element having a DC voltage circuit and in each case one converter element phase (u, v, w) of the first converter element being connected to a respective converter element phase (u, v, w) of the second converter element. Furthermore, a transformer is provided, with the secondary windings of the transformer being connected to the connected converter element phases (u, v, w, u, v, w) of the first and second converter elements. In order to ensure that virtually no amplitude components relating to the switching frequency of the converter circuit occur during its operation in the output currents of the converter circuit and in the output voltages of the converter circuit, one secondary winding is in each case connected in series in each connection of one converter element phase (u, v, w) of the first converter element to one converter element phase (u, v, w) of the second converter element, in which case each secondary winding is formed by two winding elements connected in series with one another, with the junction point of the two winding elements forming a neutral-point connection, and two filter capacitors which are connected in series with one another are in each case connected in parallel with each secondary winding.

Converter circuit with two converter elements

A converter circuit is specified for switching a large number of switching voltage levels, which has n first switching groups for each phase, with the n-th first switching group being formed by a first power semiconductor switch and a second power semiconductor switch, and with the first first switching group to the-th switching group each being formed by a first power semiconductor switch and a second power semiconductor switch and by a capacitor, which is connected to the first and second power semiconductor switches, with each of the n first switching groups being connected in series to the respectively adjacent first switching group, and with the first and the second power semiconductor switches in the first first switching group being connected to one another. In order to reduce the amount of electrical energy stored in the converter circuit, n&#x2267;1 and p second switching groups and p third switching groups are provided, which are each formed by a first power semiconductor switch and a second power semiconductor switch and by a capacitor which is connected to the first and second power semiconductor switches, where p&#x2267;1 and each of the p second switching groups is connected in series with the respectively adjacent second switching group, and each of the p third switching groups is connected in series with the respectively adjacent third switching group, and the first second switching group is connected to the first power semiconductor switch in the n-th first switching group, and the first third switching group is connected to the second power semiconductor switch in the n-th first switching group. Furthermore, the capacitor in the p-th second switching group is connected in series with the capacitor in the p-th third switching group.

Converter circuit for switching a large number of switching voltage levels

Systems and methods of the present invention are directed to wind energy. Wind rotors () drive at least two generators () which each have a corresponding rectifier unit (). The rectifier unit () being an active rectifier having drivable power semiconductor components. An energy storage circuit () is associated with each rectifier unit () and is connected in parallel to a first busbar system (). Each energy storage circuit () having at least one DC voltage capacitance, and the first busbar system () having a first protection switch () in at least one connection.

Wind energy system, as well as a method for operating such a wind energy system

A converter with a DC voltage intermediate circuit and including a rectifier circuit having an AC voltage input and a DC voltage output, which rectifier circuit can be connected to a power supply system, an invertor circuit having a DC voltage input and an AC voltage output, and a DC voltage intermediate circuit, which is arranged between the DC voltage output of the rectifier circuit and the DC voltage input of the invertor circuit. Also included is two connecting lines, leading from the DC voltage output of the rectifier circuit to the DC voltage input of the invertor circuit, and at least one intermediate circuit capacitor arranged between the connecting lines. A simplified structure is achieved by virtue of the fact that in order to protect the converter in the event of a short circuit, a first controllable semiconductor switch is arranged in at least one of the connecting lines between the DC voltage output of the rectifier circuit and the at least one intermediate circuit capacitor.

Converter with DC voltage intermediate circuit and method for operating

A voltage converter having a voltage intermediate circuit and an invertor connected to the output of the voltage intermediate circuit. The invertor produces a three-phase AC voltage at its output and is connected to the output terminals of the voltage converter by a filter arrangement. The filter arrangement includes a filter inductor connected in series with the output terminal and the filter capacitor connected between the output terminal and a common capacitor star point. Attenuation of the DC system is achieved by having the capacitor star point connected to the voltage intermediate circuit by way of an RC element having a capacitor and a resistor.

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Albbruck, Germany

Jürgen Steinke