中文摘要：

针对有源桥式隔离型三端口变换器（triple active bridge,TAB）存在的端口功率耦合和控制模型非线性问题,提出一种基于串联谐振网络的隔离型三端口变换器解耦方法。首先根据拓扑T/Δ等效变换和谐振工作原理对变换器的功率传输模型进行推导,分析了解耦网络对控制系统非线性特性的抑制作用,为系统控制环路设计和谐振参数的选取提供了依据。其次对单周期内变换器的工作模态和软开关特性进行了分析,给出功率传输电感参与谐振的实际工作过程。此外,对所研究拓扑和未解耦拓扑分别进行仿真,结果表明,该方法能够有效消除变换器功率控制环路的相互耦合,使拓扑等效为2个独立的DC/DC变换器,分别控制运行,提高系统的动态响应速度和稳定性。最后,通过试验样机在不同工况下进行实验验证,结果证明了原理分析的正确性和谐振解耦方法的有效性。

英文摘要：

Aiming at port-power coupling effect and nonlinear characteristics of triple active bridge （TAB） topology, a decoupling method of series resonance based three-port DC/DC converter was studied. According to T-A transformation and resonance principle, power transmission model of converter and inhibitory effect of resonant network on nonlinear control property were studied, providing basis for control loop design and resonance parameter selection. Then operation modes and soft switching characteristics were studied and actual working process with resonance capacitor was investigated. Simulation results in both decoupling and original topologies showed that this method can eliminate coupling effect in control loops, and allows three-port converter operating as two individual DC/DC converters, thus system dynamic respond and stability were enhanced. Finally, a test prototype was set up and experiments under various conditions were conducted. Experimental results verify correctness of analysis in operation principles and validity of resonance decoupling method.