A hybrid chain-link push-pull series connected (H-CL-P2SC) M2C with DC fault blocking capability

Kaya, Mustafa; Costabeber, Alessandro; Watson, Alan J.; Tardelli, Francesco; Clare, Jon C.

Abstract

This paper introduces a hybrid chain-link push-pull series connected (H-CL-P2SC) modular multilevel converter for HVDC applications, especially for those considering a connection of off-shore wind farms to the grid. On the ac side, each converter phase is connected to the corresponding grid phase via a single-phase center-tapped transformer whereas on the dc side, the converter phases are connected in series. The required functionality of the chain-link (CL) inductors in other modular multilevel topologies is achieved by using the leakage inductance of each transformer. As a result, the converter does not require separate CL inductors. Since the phases are series connected on the dc side, the H-CL-P2SC requires 33.3% less cells (NCs) to withstand the same dc voltage when compared to the standard modular multilevel converter (M2C). A control strategy for the H-CL-P2SC is discussed in detail. The global and internal power balance controllers are illustrated with block diagrams. A numerical comparison between the H-CL-P2SC and other typologies is also presented. Finally, the response of the H-CL-P2SC to a dc pole-to-pole (P2P) fault is shown using PLECS simulations for a 20 MW-20 kV demonstrator.

Citation

Kaya, M., Costabeber, A., Watson, A. J., Tardelli, F., & Clare, J. C. (2020, December). A hybrid chain-link push-pull series connected (H-CL-P2SC) M2C with DC fault blocking capability. Presented at 9th IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES 2020), Jaipur, India

• Presentation Conference Type: Edited Proceedings
• Conference Name: 9th IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES 2020)
• Start Date: Dec 16, 2020
• End Date: Dec 19, 2020
• Acceptance Date: Oct 17, 2020
• Online Publication Date: Mar 24, 2021
• Publication Date: Mar 24, 2021
• Deposit Date: Jul 26, 2021
• Publicly Available Date: Jul 26, 2021
• Series Title: IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES)
• Book Title: 2020 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES)
• ISBN: 9781728156736
• DOI: https://doi.org/10.1109/PEDES49360.2020.9379514
• Public URL: https://nottingham-repository.worktribe.com/output/5470355
• Publisher URL: https://ieeexplore.ieee.org/document/9379514
• Additional Information: © 2020 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.