A Harmonic Voltage Injection Based DC-Link Imbalance Compensation Technique for Single-Phase Three-Level Neutral-Point-Clamped (NPC) Inverters

被引:6
|
作者
Kang, Kyoung-Pil [1 ]
Cho, Younghoon [1 ]
Ryu, Myung-Hyo [2 ]
Baek, Ju-Won [2 ]
机构
[1] Konkuk Univ, Dept Elect Engn, Seoul 05029, South Korea
[2] Korea Electrotechnol Res Inst, Ind Applicat Res Lab, Chang Won 123456, South Korea
来源
ENERGIES | 2018年 / 11卷 / 07期
基金
奥地利科学基金会;
关键词
neutral-point-clamped (NPC) inverter; dc-link capacitor voltage balance; offset voltage injection; harmonic component; MULTILEVEL; STRATEGY;
D O I
10.3390/en11071886
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
In three-level neutral-point-clamped (NPC) inverters, the voltage imbalance problem between the upper and lower dc-link capacitors is one of the major concerns. This paper proposed a dc-link capacitor voltage balancing method where a common offset voltage was injected. The offset voltage consists of harmonic components and a voltage difference between the upper and the lower capacitors. Here, both the second-order harmonics and the half-wave of the second-order component were injected to compensate for the unbalanced voltage between the capacitors. In order to show the effectiveness of the proposed voltage injection, the theoretical analyses, simulations, and experimental results are provided. Since the proposed method does not require any hardware modifications, it can be easily adapted. Both the simulations and the experiments validated that the voltage difference of the dc-link could be effectively reduced with the proposed method.
引用
收藏
页数:15
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