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Double-carrier-based modulation theory of three-level inverters and a new discontinuous PWM for neutral-point voltage balancing

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1 Author(s)
Sangwongwanich, S. ; Dept. of Electr. Eng., Chulalongkorn Univ., Bangkok, Thailand

This paper presents a new discontinuous PWM strategy for three-level inverters to achieve both neutral-point voltage balancing and switching loss reduction. Unlike the conventional unipolar or space-vector PWM, the proposed PWM strategy can maintain the two properties over any modulation index and load power factor. The viewpoint of double-carrier-based modulation is used as the basic framework to develop the PWM theory of the three-level inverter and to generalize several concepts familiar in the two-level inverter. Further improvement on voltage distortion is achieved by blending the proposed discontinuous PWM with the conventional unipolar PWM.

Published in:

IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society

Date of Conference:

25-28 Oct. 2012