Improved Natural Balancing Of Ripple Rejection LC-Filter with Modified Phase-Shifted PWM for Single-Leg Five-Level Flying-Capacitor Converters
Vijoy Kumar Peddiny1, P.Swaminathan2
1Vijoy Kumar Peddiny,  B.E Degree in Electrical and Electronics Engineering from Dr .Babasaheb Ambedk ar Marathwada University, Aurangabad  Maharastra, India.
2Prof. P. Swaminathan, BE, EEE, M. Tech,  Degrees from MADRAS University, SASTRA University, PERIYAR University and with ANNA University, (Tamil Nadu), India.
Manuscript received on January 22, 2013. | Revised Manuscript received on February 14, 2013. | Manuscript published on February 28, 2013. | PP: 276-280 | Volume-2 Issue-3, February 2013.  | Retrieval Number: C1104022313/2013©BEIESP

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Abstract: Multilevel power electronic converters are the converter of choice in medium-voltage applications due to their reduced switch voltage stress, better harmonic performance, and Lower switching losses. Flying-capacitor multilevel converter has a distinct advantage in terms of its ease of capacitor voltage balancing. This paper analyses the natural voltage-balancing characteristic of a flying capacitor multilevel converter when it is operated under the spectrally modified Phase Shifted-pulse width modulation (PWM) strategy. Filter network connection is proposed that significantly improves the natural balancing response of a flying capacitor converter for either PWM strategy. This is most significantly done by simulation.
Keywords: Multilevel inverter, Phase shifted-PWM, Single leg five level Flying capacitor converter, self pre-charging.