Abstract
Electric vehicles are in demand in recent days due to depleting conventional energy resources. Electric vehicles which are environmental friendly are set to increase on road in coming days. The Electric vehicles which consist of electric drive systems are made up of electric motors, inverters and batteries. There is a need to increase their output quality while decreasing their size and cost. The multilevel inverter plays a vital role in improving the quality of the output voltage of the inverter. This paper presents the implementation of Elliptical Phase Disposition Pulse Width Modulation (EPD PWM) technique for higher level of Cascaded H-Bridge Multi Level Inverter (CHBMLI). The performance of 5, 7 and 9-level CHBMLI with proposed EPD PWM scheme is analyzed for three-phase RL-load. The simulation results prove that the voltage %THD reduces from 28.09 to 12.85 to 9.69 and current %THD reduces from 25.58 to 10.22 to 9.42 as the number of inverter output level increases from 5-7-9 level respectively. The simulation is carried out on MATLAB/ SIMULINK platform and the results were compared with conventional method to validate the proposed scheme. The simulation results prove that the novel EPD-PWM technique can be used to effectively control the CBHMLI.
Highlights
This paper presents the implementation of Elliptical Phase Disposition Pulse Width Modulation (EPD PWM) technique for higher level of Cascaded H-Bridge Multi Level Inverter (CHBMLI)
The results clearly show that there is an increase in the output voltage of 7-level CHBMLI
From the outputs obtained at modulation index 1 of all the three-level inverters shows that there is an increase in the output r.m.s value compare to sinusoidal PWM technique [18] [23] [24]
Summary
The pure sine wave inverters are preferred as it has high efficiency and best power quality compared to remaining output types. When compared with the SPWM technique, the SVPWM technique generates less harmonics distortion and utilizes the DC bus voltage more efficiently. SVPWM technique is intensively studied in the over-modulation region owing to its performance benefits when compared to SPWM and THIPWM, as it has higher modulation index, lower switching losses, less THD. In “THIPWM” technique a third-order harmonic content is added to a sinusoidal modulating signal thereby increasing the utilization rate of DC bus voltage by 15.5%. The simulation results show that, as the number of levels at the output increases, the output voltage becomes smoother and reduced harmonic content when compared to PD PWM technique [18]. The subsequent sections present the 5-level, 7-level and 9-level CHBMLI topologies with RL-Load, Simulation results Discussion and Conclusion
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