A Parallel Connected Unfolding Bridge (PCUB) Multilevel Converter for HVDC Applications

Hassan, Zain; Costabeber, Alessandro; Tardelli, Francesco; Watson, Alan; Clare, Jon

Abstract

© 2019 IEEE. Hybrid Voltage Source Converters (VSC), that combine the conventional three-level VSCs and Modular Multilevel Chain-Links (CLs), offer a promising solution for future HVDC stations, achieving reduced footprint with respect to the MMC while maintaining high power quality and low loss. This paper introduces a new hybrid solution named 'Parallel Connected Unfolding Bridge Modular Multilevel Converter' (PCUB) which uses a parallel connection of phases on the DC side and comprises of wave shaping Chain-Links and unfolding H-bridges. This paper presents the operating principle and basic mathematical model of the PCUB and also details an optimisation of the transformers turn ratio for the minimisation of the energy requirements in the CLs. PLECS simulation results for the proposed topology operating at 20kV DC-11kV AC and 20MW are also presented to demonstrate its performance.

Citation

Hassan, Z., Costabeber, A., Tardelli, F., Watson, A., & Clare, J. (2019). A Parallel Connected Unfolding Bridge (PCUB) Multilevel Converter for HVDC Applications. In IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society (5703-5708). https://doi.org/10.1109/IECON.2019.8927297

• Conference Name: 45th Annual Conference of the IEEE Industrial Electronics Society (IECON 2019 )
• Conference Location: Lisbon, Portugal
• Start Date: Oct 14, 2019
• End Date: Oct 17, 2019
• Acceptance Date: Jul 12, 2019
• Online Publication Date: Dec 9, 2019
• Publication Date: 2019-10
• Deposit Date: Mar 31, 2020
• Publicly Available Date: Apr 1, 2020
• Pages: 5703-5708
• Book Title: IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society
• ISBN: 9781728148786
• DOI: https://doi.org/10.1109/IECON.2019.8927297
• Public URL: https://nottingham-repository.worktribe.com/output/4230880
• Publisher URL: https://ieeexplore.ieee.org/document/8927297
• Additional Information: © 2019 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.