Universitat Der Bundeswehr Munchen

Universitaet Der Bundeswehr Muenchen

Manuel Kuder

Thomas Weyh

Richard Eckerle

Disclosed herein is a multilevel converter () for voltage conversion between a three-phase AC voltage and a DC voltage, comprising three converter arms (), each having a first end () for connecting to a corresponding phase of a three-phase AC voltage source () and a second end (), wherein each converter arm () comprises a plurality of sequentially interconnected modules (), a main energy store () having a positive terminal () connected or connectable to a positive conduction line () and a negative terminal (), a switching arrangement (), a control system (), configured to establish a positive state, in which the negative conduction line () is connected with a star point () of said three-phase AC voltage source () and the positive conduction line () is connected with the second end () of one or two converter arms () to which a positive phase voltage is currently applied, and a negative state, in which the positive conduction line () is connected with said star point () of said three-phase AC voltage source, and the negative conduction line () is connected with the second end () of one or two converter arms () to which a negative phase voltage is currently applied.

Multilevel converter for voltage conversion between a three-phase AC voltage and a DC voltage

A system for supplying AC driving voltages to a plurality of electric motors, wherein said plurality of electric motors comprise a main electric motor, one or more additional electric motors, and a variable voltage source associated with each phase of said main motor, wherein with each phase of each of said one or more additional electric motors a plurality of switches is associated, which are controllable for selectively acquiring a neutral switching state and at least one of a positive parallel switching state, and a positive serial switching state. The plurality of switches associated with a given phase of a given additional electric motor are switched to apply an effective voltage to said given phase corresponding to a set value of the corresponding phase voltage, and said variable voltage sources are controlled to provide a voltage corresponding to a voltage ensuring that an effective voltage corresponding the set value of the corresponding phase voltage of the main electric motor is applied to each of its phases, in consideration of the effective voltages applied to the phases of the additional electric motors by switching said plurality of switches associated with these phases.

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Munich, Germany

Manuel Kuder