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.
Highlights
Power Electronics based inverters are widely used in many industrial, aerospace and military applications because of their incredible concert on control capability and energy saving
The proposed VFISPWM technique always claims lower Total Harmonic Distortion (THD) than CFISPWM technique and the Load voltage waveform shows that the top and bottom levels of VFISPWM technique has less number of switching compared to the Crest Factor (CF)-inverted sine pulse width modulation (PWM) (ISPWM) technique
These results show that the VFISPWM method gives harmonic reduction for individual harmonic
Summary
Power Electronics based inverters are widely used in many industrial, aerospace and military applications because of their incredible concert on control capability and energy saving. Cascaded H-bridge topology significantly reduces the switches and harmonic content as the number of voltage levels increases more than other topologies It improves the reliability of MLIs by reducing the number of dc sources. Binder has introduced the calculation of high frequency induction machine parameters [12], and their influence is towards the stator current Even though these approaches are well suitable for the sinusoidal PWM method, it is difficult to apply for inverted sine PWM method. The variable frequency carrier based PWM is proposed to balance the switching duty among the various levels in inverters [13]. The paper is organized as follows: Section 2 introduces hybrid cascaded multilevel inverter and Section 3 explains variable frequency inverted sine PWM technique.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
