Control Device For Multi Level Power Conversion System And Multi Level Power Conversion System

Abstract: This control device for a multi level power conversion system is a control device in a multi level power conversion system having a multi level power converter and a control device and using a carrier level shift modulation method said multi level power converter having a plurality of semiconductor switching elements and a plurality of neutral point elements. The control device performs: a process for generating a modulation wave on the basis of a voltage command value of each phase; a process for generating a carrier wave that is a triangular wave signal having a predetermined carrier period; a process for generating an injection carrier that is a signal that varies in a predetermined amplitude range and has the same carrier period as and an opposite phase to the carrier wave; a process for generating a modulated wave by performing a carrier injection control for superimposing the modulation wave and the injection carrier; and a process for generating a gate signal for controlling the operations of the plurality of semiconductor switching elements and the plurality of neutral point elements in the multi level power converter on the basis of the result of comparing the modulated wave obtained by the carrier injection control with a plurality of carrier waves.

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