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Overmodulation Operation of SVM for NPC Type 3-Level Inverter  

Lee, Jae-Moon (충북대 대학원 전기공학과)
Choi, Jae-Ho (충북대 전자전기컴퓨터공학부)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.13, no.1, 2008 , pp. 22-32 More about this Journal
Abstract
This paper proposes a linearization technique for the 3-level NPC type inverter, which increases the linear control range of Inverter up to the one-pulse inverter. The overmodulation range is divided into two modes depending on the Modulation Index, MI. In overmodulation region I, the reference angles are derived from the fourier series expansion of the reference voltage corresponding to the MI. In overmodulation region II, the holding angles are also derived in the same way. Therefore, it is possible to obtain the linear control and the maximized utilization of PWM inverter output voltage.
Keywords
NPC; Inverter; Three-Level; Overmodulation; Space-Vector;
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