Improving the Reliability and EMC performance in Speed Regulating System of Asynchronous Motor
(0) This paper proposes a strategy based on threephase four-leg structure that can improve either reliability or EMC performance in speed regulating system of asynchronous motor.In the strategy,if the system is working orderly, the fourth leg functions in balancing the output voltage so as to reduce the common mode (CM) voltage of the system. During this process, the use of state exchange method not only breaks through the limitation of SPWM modulation index to avoid the extremely low utilization ratio of direct current (DC) voltage,but also reduces the total harmonic distortion factor (THD) of the output voltage.If an inverter leg of system is in failure, the fourth leg acts as the redundant leg to take the place of that one. The transitory open-loop control is adopted to reduce the overshoot current and to switch leg smoothly.Thus the system can run uninterruptedly in the fault tolerant operation mode and the holistic reliability can be improved markedly.The effectiveness of the strategy is proved by simulation and experiment results.
Three-phase four-leg reliability common mode voltage fault tolerant operation strategy
Huang Jin Xiong Rui Zhou Yunping
College of Electrical and Electronic Engineering,Huazhong University of Science and Technology,China
国际会议
Asia-Pacific Conference on Environmental Electromagnetics CEEM2009(第五届亚太环境电磁学学术会议)
西安
英文
429-432
2009-09-16（万方平台首次上网日期，不代表论文的发表时间）