Selective Harmonic Elimination in Symmetrical Cascaded H-Bridge Multilevel Inverter with Newton Raphson Algorithm

SEEE DIGIBOOK ON ENGINEERING & TECHNOLOGY, VOL. 01, FEB 2018 PP.(134-138)
Abstract– This paper presents the development of a control approach for single phase Cascaded H-Bridge Multilevel Inverter (MLI) in the recent decade for high power and medium voltage energy control. The Selective Harmonic Elimination- Pulse Width Modulation (SHE-PWM) technique is being employed to reduce the lower order harmonics. Newton Raphson algorithm is used to calculate switching angles for a range of variation of the modulation rate for an symmetrical cascaded multilevel inverter control. Based on the simulation studies, performance of the nine level symmetrical cascaded H-bridge inverter is evaluated. Hence it is found that the cascaded MLI performs well with SHE PWM based on the switching angles determined from Newton Raphson algorithm.
Index Terms – Symmetrical CHB, multilevel inverter, Newton Raphson algorithm, SHE PWM, THD.
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E.Sathya, Dr.P.Maruthupandi
Government college of Technology,
Coimbatore, India
sathya10051995@gmail.com,
pandi@gct.ac.in

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