Impact of DC-link Voltage Ripple on Induction Motor Drives Utilizing Cascaded H-bridge Multilevel Inverter
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Abstract
This article investigates the impact of DC-link voltage ripple on the performance of the 5-level CHB IM drive, especially focusing on torque ripple and speed variations. Each H-bridge cell of the CHB inverter obtains an isolated DC power supply from a single-phase full-bridge rectifier. Particular capacitance values are utilized on the output side of rectifiers to visibly demonstrate the different amounts of ripple in the DC-link voltage. In this study, the motor speed is consistently held at 500 rpm throughout the operating range, while the load torque is considered in both no-load and with-load conditions. The IPD level-shifted technique is employed to produce the switching signals of the 5-level CHB IM drive, which is based on the FOC strategy. The validation of the drive system performance influenced by the quality of the DC-link voltage waveform is entirely verified by simulation results.
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