TY - GEN
T1 - Simple comparison of different PWM strategies for a three-level H-bridge flying capacitor converter
AU - Ruderman, A.
AU - Reznikov, B.
PY - 2010/8/24
Y1 - 2010/8/24
N2 - The paper presents a comparison of phase-shifted and modified level-shifted carrier-based PWM strategies for a three-level H-bridge flying capacitor converter. While the optimal voltage quality of the nearest level switching may be obtained using both of them, natural voltage balancing dynamics is different. Using elementary circuit theory and switched system time domain analysis, it is possible to obtain simple analytical averaged voltage balancing dynamics solutions. Modified level-shifted carrier-based PWM is shown to provide much faster voltage balancing dynamics, especially, for small DC PWM voltage commands and AC PWM modulation indices. The explanation of this fact is obtained by analysis of zero voltage state sequences for different modulation strategies. Relatively fast voltage balancing dynamics rate provided by modified level-shifted carrier-based PWM for zero voltage command makes it possible to implement simple flying capacitors self-precharge procedure at power-up.
AB - The paper presents a comparison of phase-shifted and modified level-shifted carrier-based PWM strategies for a three-level H-bridge flying capacitor converter. While the optimal voltage quality of the nearest level switching may be obtained using both of them, natural voltage balancing dynamics is different. Using elementary circuit theory and switched system time domain analysis, it is possible to obtain simple analytical averaged voltage balancing dynamics solutions. Modified level-shifted carrier-based PWM is shown to provide much faster voltage balancing dynamics, especially, for small DC PWM voltage commands and AC PWM modulation indices. The explanation of this fact is obtained by analysis of zero voltage state sequences for different modulation strategies. Relatively fast voltage balancing dynamics rate provided by modified level-shifted carrier-based PWM for zero voltage command makes it possible to implement simple flying capacitors self-precharge procedure at power-up.
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U2 - 10.1109/OPTIM.2010.5510393
DO - 10.1109/OPTIM.2010.5510393
M3 - Conference contribution
AN - SCOPUS:77955758080
SN - 9781424470198
T3 - Proceedings of the International Conference on Optimisation of Electrical and Electronic Equipment, OPTIM
SP - 544
EP - 550
BT - 2010 12th International Conference on Optimization of Electrical and Electronic Equipment, OPTIM 2010
T2 - 2010 12th International Conference on Optimization of Electrical and Electronic Equipment, OPTIM 2010
Y2 - 20 May 2010 through 22 May 2010
ER -