面向家庭直流微电网的多端口变换器研究

为减少家庭直流微电网中变换器的数量,本文提出了一种新型多端口直流变换器及其控制策略。该变换器具备4个端口,原边通过将双向Buck/Boost电路和移相全桥变换器的两个桥臂开关管进行复用而得到两个输入端口,副边与同步Buck变换器相结合构成高、低压两个输出端口,并通过选择和比较各端口的控制量实现多端口变换器控制策略的切换。该变换器能够实现多电压等级输入/输出及其端口电压的恒定控制、能量双向流动以及控制策略切换等功能,相较于其他多端口变换器,具有结构简单、功率密度高等优点。最后,本文通过Matlab/Simunlink软件搭建仿真模型,并进行详细的实验分析,结果验证了理论分析的正确性和有效性。

Research on Multi-port Converter for Household DC Microgrid

To reduce the number of converters in a household DC microgrid,a novel multi-port DC converter and its control strategy are proposed in this paper.This converter has four ports.The primary side obtains two input ports by multiplexing two switches of a bidirectional Buck/Boost circuit and a phase-shifted full-bridge converter,while the sec ondary side is combined with a synchronous Buck converter to form high-and low-voltage output ports.In addition,the control strategies for the multi-port converter are switched by selecting and comparing the control parameters of each port.As a result,the converter can realize functions such as input and output at multiple voltage levels,constant con trol of port voltage,bidirectional energy flow between ports,and control strategy switching.Compared with other multiport converters,it has advantages including a simple structure and high power density.Finally,a simulation model is built using Matlab/Simulink,and a detailed experimental analysis is carried out.Simulation results verify the correct ness and effectiveness of the theoretical analysis.