Active DC voltage balancing PWM technique for high-power cascaded multilevel convertersTools Tarisciotti, Luca and Zanchetta, Pericle and Watson, Alan James and Bifaretti, Stefano and Clare, Jon C. and Wheeler, Patrick (2014) Active DC voltage balancing PWM technique for high-power cascaded multilevel converters. IEEE Transactions on Industrial Electronics, 61 (11). pp. 6157-6167. ISSN 1557-9948 Full text not available from this repository.AbstractIn this paper a dedicated PWM technique specifically designed for single-phase (or four wire three-phase) multilevel Cascaded H-Bridge Converters is presented. The aim of the proposed technique is to minimize the DC-Link voltage unbalance, independently from the amplitude of the DC-Link voltage reference, and compensate the switching device voltage drops and on-state resistances. Such compensation can be used to achieve an increase in the waveform quality of the converter. This is particularly useful in high-power, low supply voltage applications where a low switching frequency is used. The DC-Link voltage balancing capability of the method removes the requirement for additional control loops to actively balance the DC-Link voltage on each H-Bridge, simplifying the control structure. The proposed modulation technique has been validated through the use of simulation and extensive experimental testing to confirm its effectiveness.
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