A Power Electronic Traction Transformer Configuration With Low-Voltage IGBTs for Onboard Traction Application
A Power Electronic Traction Transformer Configuration With Low-Voltage IGBTs for Onboard Traction Application
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DOI：
10.1109/tpel.2018.2889107
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发表时间：
2019-09
影响因子：
6.7
通讯作者：
Jiepin Zhang;Jianqiang Liu;Shigeng Zhong;Jingxi Yang;Nan Zhao;T. Zheng
中科院分区：
文献类型：
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作者：
Jiepin Zhang;Jianqiang Liu;Shigeng Zhong;Jingxi Yang;Nan Zhao;T. Zheng
固态Transformer在车载牵引应用中也称为电力电子牵引Transformer（PETT），用于取代工频牵引Transformer和四象限变流器，以进一步提高效率，节省安装空间，减轻车载设备重量。然而，基于具有模块化串并联结构的常规PETT配置，由于半导体器件的开关特性、Transformer设计和高压绝缘设计引起的限制，难以同时保证高效率和高功率密度。针对上述问题，提出了一种适用于车载牵引应用的PETT结构和参数设计方法，用低压绝缘栅双极型变换器（IGBT）代替传统的DC/DC级。通过使用所提出的配置，高压IGBT可以被低压IGBT取代，这可以有助于降低开关损耗。同时，可以保证所有IGBT的零电流开关或零电压开关，并且中频变压器（MFTs）的数量不会增加。因此，最终可以实现PET的多重优化，包括开关损耗、MFT和开关数量以及成本。最后，建立了一个实验样机，以验证所提出的PETT配置的性能。
Solid-State transformer for onboard traction application is also addressed as power electronic traction transformer (PETT), which is used to replace the line frequency traction transformer and four-quadrant converter to further improve efficiency, save installation space, and reduce weight of the onboard equipment. However, based on the conventional PETT configuration with the modular series–parallel structure, it is hard to guarantee the high efficiency and high power density at the same time due to the limitations caused by the switching characteristics of the semiconductor devices, transformer design, and high-voltage insulation design. To deal with the mentioned problem, a PETT configuration and the parameters’ design method for onboard traction application are proposed in this paper to replace the conventional dc/dc stage with the low-voltage insulated gate bipolar translator (IGBTs). By using the proposed configuration, the high-voltage IGBTs can be replaced by the low-voltage IGBTs, which can help reduce switching loss. Meanwhile, zero-current switching or zero-voltage switching for all the IGBTs can be guaranteed, and the number of the medium-frequency transformers (MFTs) will not increase. Therefore, a multiple optimization of PETT, including switching losses, the number of MFTs and switches, and costs, can be finally achieved. Finally, an experimental prototype is built to verify the performance of the proposed PETT configuration.