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   Voltage balancing control in 3-Level Neutral-Point Clamped Converters using triangular carrier PWM modulation for FACTS applications   [View] 
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 Author(s)   Javier CHIVITE-ZABALZA, Pedro IZURZA, Gorka CALVO, Miguel RODRIGUEZ-VIDAL 
 Abstract   In this paper, a novel technique to balance the voltage of the two split dc capacitors of a 3-Level Neutral-Point-Clamped inverter using triangular carrier PWM modulation is presented. This technique, suitable for reactive power compensation and for inverters operating with a relatively low switching frequency, consists in adding a square wave at six times the output frequency. Subsequently, the paper presents a comparison with two already known strategies in which a sinusoidal waveform at two and six times the output frequency are injected. The current contribution to the mid-point of the dc bus is then analysed for different modulation indexes and operating conditions. Based on this analysis, a small-signal averaged model, suitable for control design purposes is presented. Finally, simulation and experimental results on a 690 V AC, 120 kVA test bench that validate the theory are shown. 
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Filename:0185-epe2011-full-11500950.pdf
Filesize:2.363 MB
 Type   Members Only 
 Date   Last modified 2012-01-26 by System