Zhang, Yi

PROJECT TITLE: Reliability Oriented Design and Optimization of Modular Multilevel Converter

PhD period: 2016.11.01 – 2019.10.31.
Section: Power Electronic Systems
Research Programme: Efficient and Reliable Power Electronics
Supervisor: Frede Blaabjerg
Co-Supervisor: Huai Wang
Contact Information

Collaborator: Harbin Institute of Technology.
Funding: China Scholarship Council (CSC), Center of Reliable Power Electronics (CORPE).


The high-voltage direct current (HVDC) system based on the modular multilevel converter (MMC) has attracted widespread attentions nowadays. Although the MMC has a modular and redundant structure, which can significantly enhance its reliability and fault tolerance, there are lack of study on its reliability aspect performance. Both operation environments and loading conditions affect the reliability of MMC, therefore, key design variables, component sizing, and sub-module configurations are important from reliability point of view. 

This project will investigate the electrical and thermal behaviors of both passive and active components, and its impact on the system-level reliability.  Accelerated degradation testing of key components and sub-module prototypes will be performed.  The expected outcomes will be a reliability oriented design method for component sizing and system optimization of MMC. An experimental demonstrator will be developed adaptive to various aspects of reliability study. 


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