Optimal pulse-width modulation for three-level inverters

被引：175
作者：
Brückner, T
Holmes, DG
机构：
[1] Tech Univ Berlin, Inst Energy & Automat, D-10587 Berlin, Germany
[2] Monash Univ, Dept Elect & Comp Syst Engn, Clayton, Vic 3800, Australia
来源：
IEEE TRANSACTIONS ON POWER ELECTRONICS | 2005年 / 20卷 / 01期
关键词：
discontinuous modulation; pulse-width modulation (PWM); three-level inverter;
D O I：
10.1109/TPEL.2004.839831
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
The three-level neutral-point-clamped voltage source inverter is widely used in high power, medium voltage applications. This paper studies continuous and discontinuous pulse-width modulation for this inverter. Detailed analysis of discontinuous modulation shows that the average switching frequency is not directly proportional to the carrier or sampling frequency, since additional,switching transitions occur between different regions of discontinuity. At typical switching frequencies for high power applications (up to 2 kHz) these additional transitions contribute significantly to the inverter's total losses, so that a proper comparison of the harmonic performance can only be carried out under constant loss conditions with varying carrier frequency. This comparison is performed for a typical industrial medium voltage inverter. The paper then considers the major issues of neutral-point voltage balancing and loss distribution within the inverter, for the identified optimal modulation schemes.
引用
收藏
页码：82 / 89
页数：8
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