Song, Chaochao

PhD student Chaochao Song

PROJECT TITLE: Efficient and Reliable Dual Active Bridge Converters for Photovoltaic Systems


PhD period: 2019.12.01 – 2022.11.30.
Section: Power Electronic Systems
Research Programme: Efficient and Reliable Power Electronics 
Supervisor: Yongheng Yang
Co-Supervisor: Frede Blaabjerg
Contact Information

Collaborator: Shandong University.
Funding: China Scholarship Council (CSC).

ABSTRACT

High-voltage DC (HVDC) transmission is a future trend in photovoltaic (PV) systems due to higher efficiency and lower control complexity. High-power high-voltage interface DC-DC converters are a major bottleneck of HVDC PV systems. Hence, there is a significant value to explore the topologies, control schemes, and reliability of the interface DC-DC converters.

Dual active bridge (DAB) DC-DC converter has wide application in PV systems, and compared with traditional two-level DAB converters, multilevel converters can burden higher rated voltage and realize higher step-up ratio, thus reduce the number of cascaded converters and cut the hardware cost. However, the research about multilevel DAB converters is still in the initial stage. The aim of this Ph.D. project is thus to explore the performances of multilevel DAB converters on the following aspects: (a) Basic characteristics including static and dynamic characteristics, such as dead-time effects and DC bias.  (b) Efficient modulation schemes. (c) Bi-oriented design considering efficiency and reliability. (d) Modulation of cascaded DAB converters.

Papers

Publications in journals and conference papers may be found at VBN.