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A VSC transmission system using flying capacitor multilevel converters and selective harmonic elimination pWM control

Xu, L. and Agelidis, V.G. (2005) A VSC transmission system using flying capacitor multilevel converters and selective harmonic elimination pWM control. In: International Power Engineering Conference (IPEC), 2005-11-29 - 2005-12-02.

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Abstract

A transmission system based on voltage-source three-level flying capacitor (FC) multilevel converters with selective harmonic elimination pulse-width modulation (SHE-PWM) control is presented in this paper. The generation of the switching patterns for each power device is described taking into account the natural balancing of the FC voltages. A new and simple control method for balancing the FC voltages of the FC converter when using SHE-PWM is proposed which is based on the small change of the firing angle according to the load current polarity. Implementation of the SHE-PWM with capacitor voltage balancing is provided. Simulation studies for a 300MW/+/- 150kV transmission system are presented to confirm the satisfactory performance of the proposed system.