Abstract:
A cascaded H-bridge (CHB) converter-based medium or high-voltage motor drive system with three single-phase CHB chains may experience severe second-harmonic ripple power. This issue can be solved by oversizing dc capacitors or using active power decoupling control with additional active or passive components, but this increases system cost and complexity.
This project proposes power decoupling control for regenerative CHB-based converters without additional components. By adding a set of negative-sequence decoupling currents to the front-end pulsewidth-modulated rectifier of each submodule, the second-harmonic ripple power can be removed from the submodule dc capacitors and all ripple power in the transformer core legs can be counteracted without affecting magnetic flux or grid current.
CHB converter input and output measurements determine decoupling current. It increases modulation index minimally and does not affect input and output power quality. Simulations and a 72-kW prototype prove the proposed control works.
Note: Please discuss with our team before submitting this abstract to the college. This Abstract or Synopsis varies based on student project requirements.