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Abstract

A power electronic converter assembly is provided having a multi-level converter, a plurality of phase elements and a controller to switch the multi-level converter. The multi-level converter includes a plurality of AC terminals and is operable to generate an AC phase voltage (V_A, V_B, V_C) at each AC terminal. The plurality of phase elements define a star connection in which a first end of each phase element is connected to a common junction. Each AC terminal is connected in series with a second end of a respective phase element of the star connection. The controller can switch the multi-level converter to modulate the plurality of AC phase voltages (V_A, V_B, V_C) to define a set of asymmetrical voltage vectors so as to synthesise a non-zero neutral point voltage at the common junction of the star connection, the non-zero neutral point voltage and each AC phase voltage (V_A, V_B, V_C) defining a line-to-neutral voltage across each phase element, the line-to-neutral voltages being equal in magnitude and displaced at equidistant phase angles.

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First Claim