Natural balancing of flying capacitor voltages in multicell inverter under PD carrier-based PWM

Shukla, A., Ghosh, A., & Joshi, A. (2010) Natural balancing of flying capacitor voltages in multicell inverter under PD carrier-based PWM. IEEE Transactions on Power Electronics.

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The flying capacitor multicell inverter (FCMI) possesses natural balancing property. With the phase-shifted (PS) carrier-based scheme, natural balancing can be achieved in a straightforward manner. However, to achieve natural balancing with the harmonically optimal phase-disposition (PD) carrierbased scheme, the conventional approaches require (n-1) x (n-1) trapezoidal carrier signals for an n-level inverter, which is (n-1) x (n-2) times more than that in the standard PD scheme. This paper proposes two improved natural balancing strategies for FMI under PD scheme, which use the same (n-1) carrier signals as used in the standard PD scheme. In the first scheme, on-line detection is performed of the band in which the modulation signal is located, corresponding period number of the carrier, and rising or falling half cycle of the carrier waveform to generate the switching signals based on certain rules. In the second strategy, the output voltage level selection is first processed and the switching signals are then generated according to a rule based on preferential cell selection algorithm. These methods are easy to use and can be simply implemented as compared to the other available methods. Simulation and experimental results are presented for a five-level inverter to verify these proposed schemes.

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ID Code: 41097
Item Type: Journal Article
Refereed: Yes
Keywords: Capacitor Voltage, Capacitors, Inverters, Pulse Width Modulation, Switches, Switching Frequency, Transient Analysis, Flying Capacitor Multicell Inverter, Natural Balancing, Phase Disposition, Phase-shifted
DOI: 10.1109/TPEL.2010.2089807
ISSN: 0885-8993
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > ELECTRICAL AND ELECTRONIC ENGINEERING (090600)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Past > Schools > School of Engineering Systems
Deposited On: 08 May 2011 21:49
Last Modified: 29 Feb 2012 14:32

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