1. An Improved H8 Topology for Common-Mode Voltage Reduction
- Author
-
Yong Kang, Meijuan Wang, Xuejun Pei, Puxin Shi, and Yangxiao Xiang
- Subjects
Computer science ,020208 electrical & electronic engineering ,Topology (electrical circuits) ,02 engineering and technology ,Topology ,DC-BUS ,Electromagnetic interference ,Power (physics) ,law.invention ,Capacitor ,Zero state response ,law ,0202 electrical engineering, electronic engineering, information engineering ,Common-mode signal ,Electrical and Electronic Engineering ,Voltage - Abstract
This paper presents an improved H8 power converter for common-mode voltage (CMV) reduction and electromagnetic interference suppression. The proposed H8 converter can realize zero CMV variation when entering and leaving the zero state, which is mainly achieved by both the improvement of the structure and the control strategy. For the system structure, two switches are added on the dc bus to float the ac part of the three-phase converter in the zero state. Besides, additional capacitors are used to realize controllable CMV. For the control strategy, a simple control strategy is proposed for the H8 converter. It can automatically adapt to the flowing orientation of the load current to realize synchronous switching of the power switches, which effectively eliminates the impact of the dead time. Through analysis, simulations, and experiment, a comparison between the proposed H8 converter and the conventional H6 converter is performed. Results validate the effectiveness of the H8 topology.
- Published
- 2019
- Full Text
- View/download PDF