23.
[234] Wang, Kui, Li, Yongdong, Zheng, Zedong, Xu, Lie, Fan, Boran.A commonmode voltage reduction method for a backtoback fourlevel hybridclamped converter.2015 18th International Conference on Electrical Machines and Systems, ICEMS 2015,Published 2015,Pages 15581563.
[235] Fan, Boran, Wang, Kui, Li, Yongdong, Zheng, Zedong, Xu, Lie.A branch energy control method based on optimized neutralpoint voltage injection for a hexagonal modular multilevel direct converter (Hexverter).2015 18th Inter