A Fixed Frequency Full-Bridge Three-Level DC-DC LCL-Type Series Resonant Converter for Large Scale Solar PV Plants Applications

Omar, Anwar Al; Wheeler, Pat; Zanchetta, Pericle; Burgos-Mellado, Claudio

Abstract

Large scale solar PV plants are typically connected into medium voltage AC grids using line frequency transformers, which are bulky. In application where size and/or weight are important an attractive alternative is the use of multilevel inverter configurations such as cascaded H-bridge multilevel inverters, where power converters play a vital role in the system architecture. This paper presents the operation, design, optimization and some simulation results for a fixed frequency full-bridge three-level LCL-type high frequency (HF) transformer isolated DC-DC resonant converter for large scale solar PV plants applications. Operation of the converter is illustrated for different operating intervals, including key waveforms and equivalent circuits. A design procedure using approximate analysis for 10 kW, 750 V input voltage, 750 V output voltage and 100 kHz switching frequency is presented. A novel optimization problem to determine the optimal converter design is introduced. The converter is controlled using phase shift technique. Results show that all MOSFETs achieved ZVS for a range of operating points from full-load to light-load.

Citation

Omar, A. A., Wheeler, P., Zanchetta, P., & Burgos-Mellado, C. (2021, September). A Fixed Frequency Full-Bridge Three-Level DC-DC LCL-Type Series Resonant Converter for Large Scale Solar PV Plants Applications. Presented at 2021 23rd European Conference on Power Electronics and Applications, EPE 2021 ECCE Europe, Ghent, Belgium (online)

• Presentation Conference Type: Edited Proceedings
• Conference Name: 2021 23rd European Conference on Power Electronics and Applications, EPE 2021 ECCE Europe
• Start Date: Sep 6, 2021
• End Date: Sep 10, 2021
• Acceptance Date: Sep 6, 2021
• Online Publication Date: Oct 25, 2021
• Publication Date: Sep 6, 2021
• Deposit Date: Jun 14, 2024
• Publisher: Institute of Electrical and Electronics Engineers
• Peer Reviewed: Peer Reviewed
• Pages: 671-680
• Book Title: 2021 23rd European Conference on Power Electronics and Applications (EPE'21 ECCE Europe)
• ISBN: 978-1-6654-3384-6
• DOI: https://doi.org/10.23919/EPE21ECCEEurope50061.2021.9570707
• Public URL: https://nottingham-repository.worktribe.com/output/35447025
• Publisher URL: https://ieeexplore.ieee.org/document/9570707