Abstrakt

55 Level Quasi Hybrid Cascaded Multilevel Inverter

K.Muthukumar, T.S.Anandhi, S.P.Natarajan

Multilevel Inverters (MLI) are suitable for high voltage and power applications because they can reduce voltage stresses and harmonic contents. Generally cascaded hybrid MLIs uses sinusoidal PWM strategies to generate multiple dc levels in the sinusoidal AC output for the reduced THD. In this paper 55 level Quasi Hybrid Cascaded Multilevel Inverter (QHCMLI) is developed with sinusoidal PWM strategy using simulink model. The obtained results are evaluated by the performance measures such as THD, root mean square, crest factor, form factor and distortion factor for various modulation index and shows that the performance QHCMLI using POD PWM scheme is satisfactory. QHCMLI is also designed with the proposed PWM strategy using reference signals generated by switching angle method and the simulated outputs are validated by comparing the performance with the conventional PWM strategy using the proposed PWM switching strategy the performance measure of PD, POD, and APOD is improved than the previous methods for high modulation index.