一种应用于电动汽车快速充电站的高频隔离双级功率变换器

发布时间：2018-09-07 17:23

【摘要】：提出了一种新型可应用于电动汽车直流快速充电站的高频隔离型(high-frequency-isolation,HFI)双级功率变换系统结构,该变换器结合了前端三电平Buck变换器与后端LLC谐振变换器的双重优点。三电平Buck变换器开关管承受的电压为直流母线电压的一半,适合应用在高压大功率的场合,后端采用LLC谐振变换器可以实现高频电气隔离,同时具有实现逆变桥开关管零电压开通(zero-voltageswitch,ZVS),二次侧整流桥二极管零电流关断(zero-currentswitch,ZCS)的优良特性。文章详细介绍了该新型系统结构的工作原理及特性,并介绍了该两级系统结合后的新特性,并提出了变换器的均流均压控制策略。最后,搭建了一套20 k W,输入电压760 V,输出电压200~500 V的实验装置。通过实验验证了系统结构的可靠性。
[Abstract]:A novel high frequency isolated (high-frequency-isolation,HFI) two-stage power conversion system for DC fast charging stations of electric vehicles is proposed. The converter combines the advantages of the front-end three-level Buck converter and the back-end LLC resonant converter. The switching voltage of three-level Buck converter is half of the DC bus voltage, which is suitable for high voltage and high power applications. The LLC resonant converter at the back end can realize high frequency electrical isolation. At the same time, it has the advantages of realizing zero voltage switching (zero-voltageswitch,ZVS) of inverter bridge switch and zero current turn-off (zero-currentswitch,ZCS) of secondary rectifier bridge diode. This paper introduces the working principle and characteristics of the new system structure in detail, introduces the new characteristics of the two-stage system, and puts forward the current-sharing and voltage-sharing control strategy of the converter. Finally, a set of 20 kW, 760V input voltage and 200,500V output voltage are set up. The reliability of the system structure is verified by experiments.
【作者单位】：东北电力大学电气工程学院;
【基金】：国家自然科学基金资助项目(51307021) 吉林省自然科学基金资助项目(20140101076JC) 吉林市科学技术局项目(201414002)~~
【分类号】：TM46

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