Abb Schweiz Ag

Abb Research Ltd.

Hitachi Energy Ltd

Frederick Kieferndorf

Tobias Geyer

Georgios Papafotiou

Ioannis Tsoumas

Francisco Canales

Tero Viitanen

Mario Schweizer

Sami Pettersson

Ki-Bum Park

Nikolaos Oikonomou

Joerg Lehmann

Drazen Dujic

Manuel Vetterli

Stefano Mattei

Ralph Mario Burkart

Wim Van-der-Merwe

Christian Meier

Eduardo Rohr

Described herein is a method of operating a power electronic converter device for an electrical power conversion system. The power electronic converter device includes a converter circuit including an input side, an output side, a first converter, and at least one second converter. The second converter includes at least one floating cell with a DC intermediate circuit and semiconductor devices. The method includes: switching the semiconductor devices of the floating cell at switching instants determined with optimized pulse patterns or carrier-based pulse width modulation; determining a fundamental voltage component for the floating cell; and generating the fundamental voltage component in the actual voltage of the floating cell by modifying the switching instants, such that a voltage Vof the DC intermediate circuit is lying in a given reference voltage range for balancing the DC intermediate circuit of the floating cell.

Method for operating a power electronic converter device with floating cells

The present disclosure provides a contact actuating unit for an electrical circuit breaker. The contact actuating unit includes an electro-mechanical device. An actuator of the electro-mechanical device is connected to a contact arrangement in the electrical circuit breaker. The contact actuating unit further comprises a control unit. The control unit is configured to control the electro-mechanical device to move the actuator and to bring the contact arrangement from a first to a second position. The contact actuating unit further includes a command feed forward or motion trajectory and feed forward controller, configured to provide one or more data signals. At least one of the provided data signals is indicative of a predetermined force and/or torque value, adapted to command the control unit to move the contact arrangement with the actuator to a predetermined position.

Control scheme for the operation of an electric motor actuator for a medium to high voltage circuit breaker

In one embodiment, a method of operating a power electronic converter device for an electrical power converter system is provided. The power electronic converter device includes a converter circuit, a first converter, and a second converter. The first converter and the second converter are switch with a switching pattern such that the first converter and the second converter generate voltages with stepwise voltages changes and an output voltage of the power electronic converter device results from a superposition of the voltages of the first converter and the second converter. The switching pattern includes switching instants for the second converter such that the voltage of the second converter leaves the fundamental voltage component of the voltage of the first converter unchanged, such that the second converter does not generate a fundamental component of the output voltage.

A converter system for interconnecting renewable energy sources with a DC distribution bus comprises a converter unit which comprises an isolated DC-to-DC converter connectable to the renewable energy source, and a non-isolated DC-to-DC converter connectable to the DC distribution bus, which is cascade connected with the isolated DC-to-DC converter.

Power converter system for renewable energy sources

Exemplary embodiments are directed to a converter for an electrical system that is controlled in such that switching sequences for the converter, determined with respect to an optimization goal are modified such that by correcting a flux error resulting from assumptions on which the first optimization of the switching sequence is based.

Method for controlling a converter

A method is provided for predicting pulse width modulated switching sequences for a multi-phase multi-level converter. With a first predicted switching sequence, due to multi-phase redundancies, equivalent switching sequences are determined. From the equivalent switching sequences, one switching sequence optimal with respect to a predefined optimization goal is selected. The selected switching sequence is used to switch the converter.

Method and controller for controlling an electrical converter configured for generating an AC current for at least two phases

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Baden, Switzerland

Frederick Kieferndorf