Effects of imbalances and nonlinear loads on the voltage balance of a neutral-point-clamped inverter

被引：83
|
作者：
Pou, J [1 ]
Boroyevich, D
Pindado, R
机构：
[1] Tech Univ Catalonia, Dept Elect Engn Power Qual & Renewable Energy, Terrassa 08222, Spain
[2] Virginia Polytech Inst & State Univ, Dept Elect & Comp Engn, Ctr Power Elect Syst, Blacksburg, VA 24061 USA
来源：
IEEE TRANSACTIONS ON POWER ELECTRONICS | 2005年 / 20卷 / 01期
关键词：
linear imbalances; nearest vectors; neutral-point balance; nonlinear loads; space-vector modulation; three-level inverter;
D O I：
10.1109/TPEL.2004.839823
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 effects of linear imbalances and nonlinear loads on the voltage balance of the neutral-point-clamped converter are described in this paper. The study reveals that a negative sequence of output currents (linear imbalance) may produce additional low-frequency oscillations to the neutral-point voltage. Similar consequences are produced by odd-order current harmonics from a nonlinear load, while even-order harmonics can cause the neutral-point voltage to shift. Furthermore, the second, fourth, and eighth output current harmonics might produce instability to the neutral-point voltage. The second and fourth harmonics are the worst components. The maximum amplitudes of these harmonics superposed to the current fundamentals that the system can tolerate are described. Simulated and experimental examples are presented.
引用
收藏
页码：123 / 131
页数：9
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