An active modulation scheme to boost voltage utilization of the dual converter with a floating bridge

Huang, Zhen; Yang, Tao; Giangrande, Paolo; Chowdhury, Shajjad; Galea, Michael; Wheeler, Pat

Abstract

This paper proposes a capacitor voltage regulation method for the dual converter with a floating bridge for aerospace applications. This topology has previously been reported, but with a constrained voltage utilization factor due to the need for capacitor voltage regulations. In this paper, the effect of switching states on the voltage variation of capacitor is quantitatively modeled and an enhanced space vector modulation scheme with current feedback is proposed to achieve an active control of the floating capacitor voltages. This proposed method also allows further exploitation and utilization of converter voltage. The relationship between the allowed modulation index of dual converter and load power factor is obtained and expressed using a fitted polynomial equation. The advantages of the proposed method include boosted voltage utilization and superior performance in term of capacitor voltage balance. These advantages have been proven through simulation and experimental results on RL loads as well as with an open-end winding induction motor. The proposed modulation scheme can boost the converter voltage utilization by at least 10% while achieving full four-level operation. More importantly, the higher available voltage allows extending the constant torque region of the motor, the further beginning of field weakening operation could be postponed.

Citation

Huang, Z., Yang, T., Giangrande, P., Chowdhury, S., Galea, M., & Wheeler, P. (2018). An active modulation scheme to boost voltage utilization of the dual converter with a floating bridge. IEEE Transactions on Industrial Electronics, 66(7), 5623--5633. https://doi.org/10.1109/TIE.2018.2873539

• Journal Article Type: Article
• Acceptance Date: Sep 16, 2018
• Online Publication Date: Oct 8, 2018
• Publication Date: Oct 8, 2018
• Deposit Date: Nov 20, 2024
• Journal: IEEE Transactions on Industrial Electronics
• Print ISSN: 0278-0046
• Electronic ISSN: 1557-9948
• Publisher: Institute of Electrical and Electronics Engineers
• Peer Reviewed: Peer Reviewed
• Volume: 66
• Issue: 7
• Pages: 5623--5633
• DOI: https://doi.org/10.1109/TIE.2018.2873539
• Public URL: https://nottingham-repository.worktribe.com/output/36560576
• Publisher URL: https://ieeexplore.ieee.org/document/8485662