基于多重移相的双侧电压反馈DAB控制技术

Control Strategy of Dual-active-bridge Converter Based on Two-sides Voltage Feedback for Multi-phase-shift Control

双有源桥(DAB)电路是基于输入串联输出并联(ISOP)结构电力电子变压器设备的重要组成部件,然而相比传统低压隔离应用场合,在中、高压隔离功能的要求下,DAB电路中位于变压器两侧的全桥电路通常采用无直接电气连接的方式进行辅助供电,从而导致两侧电路的驱动、电压和电流模拟量的交互需要依赖光纤实现,并进一步影响到DAB电路通过部署多重移相控制技术来提高其运行效率的实现方法。在此通过分析DAB电路实施多重移相控制技术基本工作原理,提出了一种基于多重移相的双侧电压反馈控制策略,用于有高压隔离功能要求的DAB变换器,并最终在一台17 kW,650~780 V/750 V的实验样机上进行了实验验证,结果表明所提方法可以用于有高压隔离功能要求的DAB电路。

For the application of input-series output-parallel(ISOP)power electronic transformer,dual-active-bridge(DAB)converter,as the basic isolated DC/DC power converter,is one of the often used topologies.For the purpose of high efficiency,multi-phase-shift control strategy is often applied to DAB converter,however,in high voltage applications,all the above design and control strategy should be considered in accordance with the requirements of high voltage isolation.A two-sides voltage feedback control scheme is proposed for DAB converter,and finally verified by a prototype of 17 kW,650~780 V/750 V,and the result shows that proposed method could be applied for high voltage isolation.