混合三电平双有源桥变换器暂态直流偏置抑制  

Transient DC Bias Suppression for Hybrid Three-level Dual Active Bridge Converters

作　　者：刘春喜[1] 王昕 杨永再 LIU Chunxi;WANG Xin;YANG Yongzai(Faculty of Electrical and Control Engineering,Liaoning Technical University,Huludao 125105)

机构地区：[1]辽宁工程技术大学电气与控制工程学院,葫芦岛125105

出　　处：《电气工程学报》2024年第4期215-224,共10页Journal of Electrical Engineering

基　　金：辽宁省教育厅科学研究经费重点攻关资助项目(LJ2020ZD004)。

摘　　要：二极管钳位型混合三电平双有源桥变换器采用扩展移相控制时,如果桥间移相比发生突变,变换器中的电流会产生直流偏置现象,使开关管电流应力增加,严重时还会导致系统过流和变压器磁饱和。针对该问题,研究了一种基于重构电感电流斜率的改进暂态直流偏置抑制方法。首先,分析暂态直流偏置的形成原因,构建暂态直流偏置模型。其次,根据不同的电感电流斜率选择最佳的开关状态,在最短时间内使电感电流斜率最大以抑制直流偏置。最后,在不同工作模式下,将改进方法与传统直流偏置抑制方法进行了仿真比较。结果表明,所提方法可以成功地抑制直流偏置,减小过流,且暂态过程仅占一个开关周期的10.2%,提高了系统的动态响应速度。When the diode-clamped hybrid three-level dual active bridge converter adopts extended phase-shifting control,if the phase-shifting ratio between bridges changes abruptly,the current in the converter will produce DC bias,which will increase the current stress of switching devices,and even lead to system overcurrent and transformer saturation.To solve this problem,an improved transient DC offset suppression method based on reconstructed inductor current slope is studied.Firstly,the causes of transient DC bias are analyzed,and the transient DC bias model is constructed.Secondly,select the best switch state according to different inductance current slope,and maximize the inductance current slope in the shortest time to suppress DC bias.Finally,the improved method is simulated and compared with the traditional DC bias suppression method under different operating modes.The results show that the proposed method can successfully suppress the DC bias and reduce the overcurrent,and the transient process only accounts for 10.2%of a switching period,which improves the dynamic response speed of the system.

关 键 词：混合三电平双有源桥变换器 扩展移相控制 暂态直流偏置 重构电感电流斜率 

分 类 号：TM464[电气工程—电器]