Abb Schweiz Ag

Alexandre Christe

Tobias Geyer

Michail Vasiladiotis

Michele Luvisotto

Yuhei Okazaki

A voltage source converter as well as a method and computer program product for controlling the converter. The converter includes at least one phase leg connected between a first DC terminal having a first voltage and a second DC terminal having a second voltage, the phase leg including an upper arm and a lower arm with cells, where a junction between the arms is connected to a corresponding AC terminal. The converter also includes a control unit configured to control the cells to output a train of pulses of trapezoidal shape where the generation of a first control signal for a first cell used to initiate a transition between two levels of a pulse coincides with the decision that a transition is to be made.

Control of an ICBT converter

A method of decoupled modulation of a direct AC/AC MMC between a first AC network L having a first waveform and a second AC network R having a second waveform includes performing first and second modulations based on respective reference signals of the first and second AC networks to generate, for each phase leg, first and second integer command signals corresponding to first and second combinations of cell states in the branches of the phase leg needed for generating the first and second waveforms. The method also includes, based on the first and second integer command signals, mapping to each branch a number of cell states to be used for concurrently generating both the first and second waveforms.

Modulation of AC/AC MMC

In a method of controlling a DC-to-AC Modular Multilevel Converter (MMC) having a three-phase AC side connected to a three-phase AC network and having a DC side connected to a DC network, the MMC has a double-star topology with a plurality of phase-legs. Each phase-leg has a first branch and a second branch. Each of the first and second branches includes a plurality of series connected converter cells. The method includes obtaining an Optimized Pulse Pattern (OPP) for the MMC. The method also includes adapting the OPP to the MMC by means of closed-loop pulse pattern control. The method also includes, based on the adapted OPP, sending firing signals to the plurality of cells of each branch.

Growing community of inventors

Veysonnaz, Switzerland

Alexandre Christe