Closed-loop control of DC-DC dual active bridge converters driving single-phase inverters
Closed-loop control of DC-DC dual active bridge converters driving single-phase inverters
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DOI：
10.1109/tpel.2013.2257859
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发表时间：
2012-11
期刊：
影响因子：
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通讯作者：
Hengsi Qin;J. Kimball
中科院分区：
文献类型：
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作者：
Hengsi Qin;J. Kimball
固态Transformer（SST）是一种高频电力电子变换器，用作配电Transformer。SST的常见三级配置由AC-DC整流器、隔离DC-DC双有源桥（DAB）转换器和DC-AC逆变器组成。本工作解决了DC-DC DAB转换器驱动调节单相DC-AC逆变器时的控制器设计问题。由于逆变器级的开关频率远高于DAB级的开关频率，因此单相逆变器被建模为120 Hz电流吸收器。研究了单相逆变器对120 Hz电流的影响。研究了PI控制器的局限性，即120 Hz时的低增益。提出了两种改善DAB变换器输出电压调节的方法。第一种方法使用带阻滤波器和前馈，而第二种方法在反馈回路中使用额外的比例谐振控制器。给出了理论分析、仿真和实验结果。
The solid state transformer (SST) is a high-frequency power electronic converter as a distribution power transformer. A common three-stage configuration of an SST consists of ac-dc rectifier, isolated dc-dc dual-active-bridge (DAB) converter, and dc-ac inverter. This work addresses the controller design issue for a dc-dc DAB converter when driving a regulated single-phase dc-ac inverter. Since the switching frequency of the inverter stage is much higher than that of the DAB stage, the single-phase inverter is modelled as a 120-Hz current sink. The effect of 120-Hz current by the single-phase inverter is studied. The limitation of PI-controller, low gain at 120 Hz, is investigated. Two methods are proposed to improve the regulation of the output voltage of DAB converters. The first one uses a bandstop filter and feedforward, while the second method uses an additional proportional-resonant controller in the feedback loop. Theoretical analysis, simulation and experiment results are provided.