Phase Shifted Carrier based Sinusoidal PWM Techniques for Cascaded H-Bridge Multi Level Inverter in Induction Motor

SEEE DIGIBOOK ON ENGINEERING & TECHNOLOGY, VOL. 01, FEB 2018 PP.(169-173)
Abstract– The Synchronization strategy analyses cascaded H-Bridge multilevel inverter (CHBMLI) topologies with carrier-based sinusoidal phase shifted pulse width modulation (PSPWM) technique. A separate carrier is used for each H-Bridge (HB) in PSPWM technique. To obtain unipolar PWM, the carriers are phase shifted from one another by ∏/x rad. The value of x is determined with the number of H-Bridges used. To maintain quarter wave symmetry among the multi-level inverter, the carrier frequency is chosen to be the integer multiple of the fundamental frequency. The zero crossings of the carriers with respect to the zero crossings of the voltage reference plays an important role to maintain quarter wave symmetry. In this paper, the conditions for half-wave symmetry and quarter wave symmetry are experimentally verified with a five-level CHBMLI for a PSPWM technique using Matlab software.
Index Terms – phase shifted carrier based PWM, cascaded H-Bridge multilevel inverter, quarter wave symmetry, half wave symmetry.
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K.Golda Jeba1, Dr. K. Baskaran1
Government College of Technology,
Coimbatore, India.
golda.jeba@gmail.com,
drbaskaran@gct.ac.in

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