TITLE:
Modeling and Analysis of Variable Frequency Inverted Sine PWM Technique for a Hybrid Cascaded Multilevel Inverter
AUTHORS:
M. Sudhakaran, R. Seyezhai
KEYWORDS:
Cascaded Multilevel Inverter, Constant Frequency Inverted Sine PWM, Variable Frequency Inverted Sine PWM, Total Harmonic Distortion
JOURNAL NAME:
Circuits and Systems,
Vol.7 No.9,
July
28,
2016
ABSTRACT: In cascaded H-bridge
multilevel inverter, a variable frequency inverted sine PWM technique is
modeled for hybrid electric vehicles. It has a particular advantage of
increasing power which is achieved using series connection of H-bridge and also
this topology is capable to produce superior spectral quality with considerable
improvement of fundamental voltage. The variable frequency inverted sine PWM
technique produces lesser torque ripple and enhances the fundamental output
voltage mainly at lower modulation index ranges. The topologies of multilevel
inverter are flying capacitor, diode clamped and cascaded inverter. In the
paper, we will discuss about the cascaded multilevel inverter based on inverted
sine PWM technique. The two switching strategies widely used to control
multilevel inverters are constant frequency inverted sine PWM (CF-ISPWM) and
variable frequency inverted sine PWM (VF-ISPWM). This implies that switch
utilization substantially reduces 32.35% of the constant frequency inverted
sine PWM switching technique. The performance of the technique is validated in
terms of Total Harmonic Distortion (THD) and Torque ripple which significantly
reduces when compared to constant frequency ISPWM. The analysis of conventional
triangular PWM inverter and inverted sine PWM inverter using constant and
variable switching scheme is done in MATLAB Simulink and verified
experimentally by FPGA Spartan 3E processor.