Capacitor Voltage Ripple Minimization of a Modular Three-Phase AC/DC Power Electronics Transformer With Four-Winding Power Channel
Capacitor Voltage Ripple Minimization of a Modular Three-Phase AC/DC Power Electronics Transformer With Four-Winding Power Channel
复制标题
具有四绕组电力通道的模块化三相交流/直流电力电子变压器的电容器电压纹波最小化
DOI：
10.1109/access.2020.3005530
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发表时间：
2020
期刊：
影响因子：
3.9
通讯作者：
Wang Cheng
中科院分区：
文献类型：
--
作者：
Li Xiaohui;Cheng Linqian;He Liqun;Zhu Zhongkui;Yang Yong;Wang Cheng
模块化级联结构的电力电子变压器（PET）已成为连接交直流电网的灵活接口。然而，从交流源引入的显著二阶纹波功率需要在模块电容器中存储相当大的能量，这可能会降低整体功率密度并增加系统成本。本文提出了一种基于功率通道的四绕组PET （PC-PET）来解决这一问题。由于功率通道的交叉相位，低频纹波可以通过磁通抵消相互抵消。为了提高功率去耦的精度，考虑了不一致绕组的影响。在此基础上，提出了一种结合功率平衡的基于比例谐振控制的PC-PET功率解耦策略，实现了对三相低频纹波功率的解耦，使模块电容电压纹波最小化。此外，通过对功率损耗、电容器体积和变压器体积的分析，讨论了功率密度的提高。仿真和实验结果验证了所提控制策略的有效性。
Power electronic transformer (PET) with modular cascaded structure has become a flexible interface between AC and DC grids. Nonetheless, the notable 2nd-order ripple power introduced from the AC source requires considerable energy storage in the module capacitors, which is likely to degrade the overall power density and increase system cost. In this paper, a power channel based four-winding PET (PC-PET) is proposed to address such an issue. Owing to the phase-crossing power channels, the low-frequency ripples can cancel each other through magnetic flux counteracting. To improve the accuracy of power decoupling, the effect compromised by inconsistent windings is considered. Accordingly, a proportional-resonant (PR) control based power decoupling strategy for PC-PET incorporated with power balance is proposed to decouple the three-phase low-frequency ripple powers, and minimize the voltage ripple in module capacitors. Additionally, the improvement of power density is discussed based on analyses on power losses, capacitor volume and transformer volume. Simulation and experimental results verified the validity of proposed control strategies.
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