Active DC voltage balancing PWM technique for high-power cascaded multilevel convertersTools Tarisciotti, Luca, Zanchetta, Pericle, Watson, Alan James, Bifaretti, Stefano, 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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