Improvement of ZVS Range and Current Quality of the Nine-Switch Single-Stage AC-DC Converter
Improvement of ZVS Range and Current Quality of the Nine-Switch Single-Stage AC-DC Converter
复制标题
九开关单级AC-DC变换器ZVS范围和电流质量的改进
DOI：
10.1109/tpel.2019.2947151
复制
发表时间：
2020
影响因子：
6.7
通讯作者：
Ali K
中科院分区：
文献类型：
--
作者：
Ali K
9开关单级三相ac-dc隔离转换器将三相有源前端ac-dc转换器和三相高频电隔离dc-dc转换器集成在一级中，与等效的两级配置相比，设备数量减少了25%。如果能达到与两级变换器相当的效率和输入电流质量，那么九开关变换器的优势才能真正实现。本文提出了一种设计方法，可以保证九开关变换器的底部和中间开关在整个线路周期内的零电压开关，并将其输入电流总谐波失真降低到5%以下。通过实现空间矢量脉宽调制，九开关变换器的直流链路电压降低到等效两级变换器的水平。分析结果通过一个3kw的实验室样机进行验证，该样机在400 v交流输入、800 v直流电压和380 v隔离直流输出电压下工作。
The nine-switch single-stage three-phase ac-dc isolated converter integrates a three-phase active front-end ac-dc converter and a three-phase high-frequency galvanically isolated dc-dc converter in one stage, leading to a device count reduction of 25% compared to an equivalent two-stage configuration. The advantage of the nine-switch converter can be truly realized if it can achieve similar efficiency and input current quality as a two-stage converter. In this article, a design methodology is proposed, which ensures zero-voltage switching of the bottom and the middle switches of the nine-switch converter for the entire line cycle and also reduces its input current total harmonic distortion below 5%. By implementing space vector pulsewidth modulation, the dc-link voltage of the nine-switch converter is reduced to the level of an equivalent two-stage converter. The analytical claims are verified with a 3-kW laboratory prototype operating at 400-V ac input, 800-V dc-link voltage, and 380-V isolated dc output voltage.