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Liu, Wenjie

Liu, Wenjie

PROJECT TITLE: Modeling and Control of Impedance Source Converters for Grid-Connected PV Systems

PhD period: 2018.05.01 – 2021.04.30.
Section: Power Electronic Systems
Research Programmes: Photovoltaic Systems and Efficient and Reliable Power Electronics 
Supervisor: Yongheng Yang
Co-Supervisors: Tamas Kerekes and Frede Blaabjerg
Contact Information

Collaborator: To be announced later. 
Funding: China Scholarship Council (CSC) and Department of Energy Technology.


Decreases in the amount of fossil fuel deposits has instigated more researchers and industrial companies to focus on research into renewable and green energy resources, such as solar (photovoltaic). However, the intermittent and low-voltage nature of photovoltaic inhibits its integration into the grid directly, and its reliability remains low. In order to meet grid-connected codes and load demands, the impedance-source converter is a possibility, especially for grid-connected PV systems. The main feature is that the impedance network consists of inductors, capacitors, and switches/diodes, and it is employed in the circuit to boost or buck the voltage with high conversion ratios. It thus becomes a promising solution in renewable energy systems. However, the conversion ratio is not linear, and thus challenging the control and stability. Hence, in this Ph.D. project, modelling, modulation strategies and control methods for grid-connected impedance-source will be researched on to ensure high reliability operation of PV systems.


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