Prof. Yu Zhanqing, Tsinghua University


Multi terminal DC grid based on VSC has become the research hotspot, because of many superiorities, especially, on renewable energy source integration such as multiple wind farms and solar power stations, and flexible access to multi-power supplies and multi-infeed systems.
The development of power semiconductor devices is the basis of the progress of DC grid applications. A novel power semiconductor device, IGCT Plus, is developed to improve the performances of the cost, loss and reliability of the major equipment for DC Grid. The bottleneck problem of IGCT application in power grid was solved. The products have been applied in several projects.
On the other hand, major equipment, especially DC circuit breaker, is the main factor restricting DC grid progress. Hybrid DC circuit breaker is a high-profile solutions because of its fast breaking and low loss. A novel hybrid DC circuit breaker, based on coupled negative voltage source and a bridge type bi-directional power electronic switch, is developed to achieve nearly zero loss, low cost and reliable high current turn-off. 500kV/25kA/3ms DC breaker products are manufactured and used in the world’s only ultra-high voltage DC power grid.
The topic will focus on the scientific research and product manufacturing process of the novel power semiconductor devices and equipment.

Tuesday, July 28th
Italian time: 9:00-10:00
Chinese time: 15:00-16:00

Yu Zhanqing received his B. Sc. and Ph. D. Degree from the Department of Electrical Engineering, Tsinghua University in Beijing in July 2003, July 2008, respectively. After graduation, he became a post doctor and lecturer at the Department of Electrical Engineering, Tsinghua University in Beijing in July 2008 and July 2010 respectively, an associate professor in the same department in December 2012. He is currently the Vice Director of DC Research Center, Energy Internet Research Institute, Tsinghua University. He has participated in several projects sponsored by High-Tech R&D Program (863 Program), National Basic Research Program of China (973 Program), National Natural Science Foundation of China. His research interests include DC grid, DC breaker.