中国电机工程学报2016，Vol.36Issue(14)：3909-3919,11.DOI:10.13334/j.0258-8013.pcsee.151971
并联T型三电平逆变器环流抑制和中点平衡研究
Investigation of Circulating Currents Suppression and Neutral Point Balancing in Parallel Three-level T-type Inverters
邢相洋 1陈阿莲 1张子成 1张承慧1
作者信息
- 1. 山东大学控制科学与工程学院，山东省济南市 250061
- 折叠
摘要
Abstract
The parallel three-level T-type inverters (3LT2Is) can increase the system power rating and reliability. However, the circulating current will result in current distortion and degrade the overall performance of the parallel 3LT2Is. Also, the coupling problem of the circulating current and neutral-point (NP) potential will increase the difficulty of the circulating current suppression. Consequently, it proposed a novel space vector pulse width modulation(SVPWM)method to suppress the circulating currents and control the NP potential. Based on the model of the parallel 3LT2Is, the zero sequence circulating current (ZSCC) was suppressed by choosing the P-type and N-type small vector. The 3LT2I existed the inherent problem of unbalance DC-link capacitor NP voltage. Therefore, the time of the conventional symmetric SVPWM was changed by adding or subtracting the minimum dwell time to balance the NP voltage. In addition, the switching frequency and switching loss should be reduced by using the proposed method. The considerate stable NP voltage control and the circulating currents suppression has been proven in the unequal currents from a prototype inverter.关键词
T型三电平逆变器/空间矢量脉宽调制/环流抑制/中点平衡控制Key words
three-level T-type inverter (3LT2I)/space vector pulse width modulation (SVPWM)/the circulating currents suppression/neutral-point (NP) potential control分类
信息技术与安全科学引用本文复制引用
邢相洋,陈阿莲,张子成,张承慧..并联T型三电平逆变器环流抑制和中点平衡研究[J].中国电机工程学报,2016,36(14):3909-3919,11.
