半桥三端口变换器并联控制

Paralleled Control for Half-Bridge Three-Port Converters

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。

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 sha- ring 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 high- er 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 opti- mally. A 200 W HB-TPC prototype is selected as the module to build the paralleled power system. Fi- nally, the analysis and design are verified by experimental results.