一种三端口变换器的建模与控制系统设计

Modeling and Control System of a Three-port Converter

分析了一种新型三端口双向DC/DC变换器的工作原理,列写了各工作模态下的状态方程,并在此基础上建立了小信号模型,推导出解耦控制系统的传递函数,用频域法设计了该变换器的闭环控制参数。对所设计控制器的控制性能进行了实验验证。实验结果表明,控制器设计合理,系统能实现输出电压和光伏输入端电压的解耦控制,从而实现各端口的能量流控制。

The principle of a novel dual three-port DC/DC converter is analyzed, and the small-signal model is made under all operational modes.The transfer function is derived by the decoupled control system.Then the closed-loop control parameter is constructed based on the implementation of frequency domain method.Finally the design is validated by experiments, which demonstrates the feasibility of the controller and energy flow control of each port.