Voltage Modulation Method for T-type Three-Level Inverter with Reduced Conduction Loss in Low Voltage Modulation Region
Voltage Modulation Method for T-type Three-Level Inverter with Reduced Conduction Loss in Low Voltage Modulation Region
复制标题
低电压调制区降低导通损耗的T型三电平逆变器的电压调制方法
DOI：
10.23919/ipec-himeji2022-ecce53331.2022.9806877
复制
发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Jung
中科院分区：
文献类型：
--
作者：
Cheolmin Hwang;Gyu Cheol Lim;Jonghun Choi;Jung
本文提出了一种在低电压调制范围内降低T型三电平逆变器导通损耗的调制方法。T型三电平逆变器在中性点开关状态下存在较大的导通损耗，因为中性点连接处存在两个开关。所提出的方法通过修改电压参考，以避免传统的参考导致通过中性点的导通时间长的区域，从而减少逆变器的导通损耗。这种调制方法实现简单，因为它用位于上载波或下载波中间的替代偏移电压代替了空间矢量脉宽调制的常规偏移电压。在此基础上，提出了一个使导通损耗最小的最佳过渡时刻，并进行了理论损耗分析。仿真和实验结果验证了该方法的有效性。
This paper proposes a modulation method to achieve reduced conduction loss for a T-type three-level inverter in a low voltage modulation region. The T-type three-level inverter suffers from a larger conduction loss at the neutral point switching state since two switches exist at the neutral point connection. The proposed method reduces the conduction loss of the inverter by modifying the voltage reference to avoid the region where the conventional reference causes a long conduction period through the neutral point. This modulation method is simple to implement in that it replaces the conventional offset voltage of space vector pulse width modulation with an alternative offset voltage which locates in the middle of the upper or lower carrier. Furthermore, an optimal transition instant between two carriers to achieve the minimum conduction loss is proposed together with theoretical loss analysis. The proposed method is verified by the simulation and experimental results.