Mode-Change PWM Method for Improving Efficiency of 3-Level T-Type PWM Converter
Mode-Change PWM Method for Improving Efficiency of 3-Level T-Type PWM Converter
复制标题
提高三电平T型PWM转换器效率的模式改变PWM方法
DOI：
10.1007/s42835-021-00894-3
复制
发表时间：
2021
影响因子：
1.9
通讯作者：
Tae‑Hun Kim
中科院分区：
文献类型：
--
作者：
Woo;Tae‑Hun Kim
提出了一种提高三电平T型PWM变换器效率的模式变换PWM方法。一个3LT PWM变换器，除了它的增加的中点开关，具有相同的拓扑结构的2电平PWM变换器。因此，3LT PWM变换器可以根据中性点开关的操作而在两种模式下操作。在使用通用IGBT的3LT拓扑的情况下，在中性点处添加了两个IGBT，这导致了与2电平转换器相比两倍的导通损耗。因此，3LT PWM转换器比2电平转换器具有更多的传导损耗，特别是在低MI区域中。因此，3LT PWM转换器在低MI区域中具有比2电平转换器低的效率。计算并分析了各拓扑结构在不同工作模式下的开关和导通损耗。如果控制器基于在每个周期期间计算的功率损耗来确定2电平或3电平PWM转换器的操作模式，则可以提高3LT PWM转换器的效率。通过仿真和实验验证了该控制方案的有效性。比较了各种方法的波形和效率。
In this paper, the mode-change PWM method is proposed to improve the efficiency of a 3-level T-type (3LT) PWM converter. A 3LT PWM converter, except for its added neutral-point switches, has the same topology as that of the 2-level PWM converter. Therefore, 3LT PWM converter can operate in two modes depending on the operation of neutral-point switches. In the case of a 3LT topology using generic IGBT, two IGBTs are added at the neutral point, which causes twice the conduction loss compared to 2-level converters. Thus, 3LT PWM converters have more conduction loss than 2-level converters, particularly in the low MI region. Consequently, 3LT PWM converters have lower efficiency than that of a 2-level converter in the low MI region. The switching and conduction losses based on the operation mode of each topology is calculated, analyzed. If the controller determines the operation mode of the 2- or 3-level PWM converter based on the power loss calculated during every cycle, the efficiency of 3LT PWM converter can be improved. The validity of the proposed control scheme was investigated through simulation and experiments. The waveform and efficiency of each method were compared.