Abstract
The optimal PWM method is widely in high power drive systems for its capability of achieving low output distortion at low switching frequency. However, the PWM dead-time inserted into PWM pulses for avoiding “shoot through” of inverter bridge arms will introduce modulation errors between ideal optimal PWM patterns and actual outputs. This problem is extremely severe in high power drives for the large dead time, and will cause large distortion of the optimal PWM output waveforms. This paper took the selective harmonic PWM (SHEPWM) as an example. First, the basic principles of SHEPWM and dead-time effects were presented. By analyzing the polarity of three level inverter output currents and switching behaviors of the inverter, a dead-time compensation method based on on-line switching angle adjustment for the optimal PWM method is proposed. Finally, the experimental results were given for verifying the effectiveness of the proposed scheme.
Project Supported by National Natural Science Foundation of China (51077124); Graduate Student Research Innovation Program of Jiangsu Province, China (CX09B_113Z); The Fundamental Research Funds for the Central Universities (2010QNB32);“Qinglan” project of Jiangsu.
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Fu, X., Dai, P., Wu, X., Zhao, B. (2011). Dead-Time Compensation of Three-Level Optimal PWM Based on On-Line Switching Angle Adjustment. In: Wan, X. (eds) Electrical Power Systems and Computers. Lecture Notes in Electrical Engineering, vol 99. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-21747-0_115
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DOI: https://doi.org/10.1007/978-3-642-21747-0_115
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