半桥三端口变换器并联控制

介绍了一种半桥三端口变换器并联系统的均流控制策略。为了实现并联系统的稳定、均流运行,要求至少对其中两个端口进行均流控制,另一个端口根据功率平衡实现自然均流。采用一种近似解耦方法,通过设置控制环路带宽和引入解耦控制变量,实现了单个变换器模块控制环路之间的近似解耦,以方便控制环路参数设计。为了实现并联系统较高的稳定度和均流度,采用平均电流均流外环、电压内环的均流控制结构,并对均流环参数进行优化设计。基于200W半桥三端口变换器模块搭建并联系统,实验结果验证了均流控制策略的正确性。

Paralleled Control for Half-Bridge Three-Port Converters

A current sharing control strategy for paralleled power system is presented based on half-bridge three-port converter (HB-TPC). To realize the current sharing of the system, current sharing control should be applied to more than two ports simultaneously, and then the third port achieves current sharing naturally. To simplify the close-loop design, decoupling variables are employed and bandwidth of the multiple control loops is set far away to decouple the converter approximatively. To obtain the higher stability and better current equalization degree, a structure with the current sharing outer-loop and voltage regulation inner-loop structure is adopted, and parameters of the control loops are designed optimally. A 200 W HB-TPC prototype is selected as the module to build the paralleled power system. Finally, the analysis and design are verified by experimental results.