Dual active bridge converter with PWM control for solid state transformer application
Dual active bridge converter with PWM control for solid state transformer application
复制标题
适用于固态变压器应用的具有 PWM 控制的双有源桥式转换器
DOI：
--
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
R. Ayyanar
中科院分区：
文献类型：
--
作者：
Chenhao Nan;R. Ayyanar
对于单相双有源桥式变换器（DAB），基于三级固态Transformer（SST），DAB变换器看到的瞬时负载功率在双线频率下从零变化到负载平均功率的两倍。传统的相移调制（PSM）控制需要大的直流环节电容来处理负载功率的瞬时变化，而DAB变换器只处理恒定功率，从而获得更好的软开关范围和更高的效率。然而，在直流链路中所需的大电解电容器不利地影响SST的功率密度和可靠性。在本文中，PWM控制应用于最大限度地减少基于DAB的三级SST的直流环节电容。实验结果表明，采用PWM控制的DAB变换器将ZVS范围扩展到接近零负载，从而提高了轻载时的效率。因此，DAB可以实现相当高的效率，而SST的DC链路电容器可以降低到足够低的值，以实现薄膜电容器。
For the single-phase, dual active bridge converter (DAB) based three-stage solid state transformer (SST), the instantaneous load power seen by the DAB converter varies from zero to twice the load average power at double-line frequency. Traditionally with phase-shift modulation (PSM) control, large DC link capacitors are needed to handle the instantaneous load power variation while DAB converter only processes the constant power resulting in better soft-switching range and consequently high efficiency. However, the large electrolytic capacitors required in the DC link adversely affect the power density and the reliability of SST. In this paper, a PWM control is applied to minimize the DC link capacitor for the DAB based three-stage SST. The experimental results prove that DAB converter with PWM control has extended ZVS range down to nearly zero load and therefore improved efficiency at light load. Consequently, DAB can achieve comparable high efficiency while the DC link capacitors of SST can be reduced to a value low enough for film capacitor implementation.