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Variable Frequency ISPWM Technique for Cascaded H-Bridge Multilevel Inverter

Multilevel Inverters are advanced types of converters developed by power electronics branch. The performance of multilevel inverters with different modulating methods are different which is verified in the terms of THD and switching losses. The cascaded multilevel inverter topology has several beneficial points in the family of inverters in the form of reliability, faster operation, switching flexibility at various purposes in electrical power sectors and industrial drives area. This paper proposes variable frequency inverted sine carrier pulse width modulation (VFISCPWM) method for performance analysis of single phase five level cascaded H-bridge inverter. First simulation is performed in MATLAB/SIMULINK and then hardware implementation of multilevel inverter using proposed modulation method by switching of MOSFET's IRF540 in power circuit which is carried out through control circuit using microcontroller and optocoupler-gate driver unit. The THD for voltage from software and hardware implementation are compared and discussed. Also, results represented in tabular form.