Yuan, Jing

PROJECT TITLE: Efficient and Cost-Effective Impedance Source Converters for Grid-Connected Renewable Energy Systems

PhD period: 2017.11.01 – 2020.10.31.
Section: Power Electronic Systems
Research Programmes: Efficient and Reliable Power Electronics & Photovoltaic Systems
Supervisor: Frede Blaabjerg
Co-Supervisor: Yongheng Yang
Contact Information

Collaborators: The University of Hong Kong & The University of Technology Sydney.
Funding: China Scholarship Council (CSC) and Department of Energy Technology.


Power electronic systems can boost, regulate, and invert the outputs of renewable energy according to the requirements of the grid/load. Typically, a two-stage power electronic conversion system for AC loads or grids includes a DC-DC boost converter and a DC-AC inverter. However, this two-stage configuration leads to high cost and low efficiency. Impedance source converters as single-stage systems can also boost and regulate the outputs of the renewable energy sources, and thus overcome the above drawbacks of traditional two-stage systems. Nevertheless, impedance source converters still suffer from the limited voltage gain and the common mode current.

This Ph.D. project will evaluate the state-of-the-art of impedance source converters, propose new topologies for renewable energy systems (in particular, photovoltaic systems), optimize the design, and establish the large-signal and small-signal models. The proposed converters are expected to have features of high efficiency and reliability, being cost-effective. Control strategies will also be designed in this Ph.D. project for grid-connected applications. Experimental prototypes will be built up to verify the theoretical analysis and possibly towards commercialization. 


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