双有源桥变换器优化控制与实验平台设计

Optimal Control and Experimental Platform Design for Dual-active-bridge Converters

对双有源桥(DAB)变换器的扩展移相调制与三重移相调制进行了理论分析,构建电流及标幺化传输功率表达式。建立了在三重移相调制控制下DAB变换器的标幺化电流应力表达式以及在扩展移相调制控制下的标幺化回流功率表达式,分别求解出标幺化电流应力及回流功率最小时各移相角的解,并设计优化控制方案。介绍了DAB变换器实验平台的开关管选型、磁性元件设计、辅助电路设计,采样控制电路设计、软件程序设计方法,并搭建出DAB变换器实验平台。最后,在实验平台中验证电流应力与回流功率优化方案的可行性。

The extended phase shift modulation and the triple phase shift modulation of the double active bridge(DAB)converter are analyzed theoretically to construct the current and normalized transfer power expressions.The formulas for the DAB converter's normalized current stress under triple phase shift modulation control and the normalized return power under extended phase shift modulation control are constructed,and the solutions for each phase shift angle when the normalized current stress and return power are minimum are solved,followed by the creation of an optimized control scheme.The DAB converter experimental platform is constructed,and the switching tube selection,magnetic component design,auxiliary circuit design,sampling control circuit design,and software program design methodologies are introduced.Lastly,the experimental platform confirms the viability of the current stress and return power optimization scheme.