直流微网接人交流母线的变流器控制策略研究

Control Strategy Research of Single Converter for DC Microgrid Connected to AC Bus

提出了一种适用于连接直流微网和交流母线的单台变流器的控制策略,用于平衡直流微网功率。首先,给出了变流器的结构和并网工作模式下的控制系统模型;然后分析了电流内环和电压外环的控制原理和设计方法;最后进行了实验验证,证明该控制策略可在直流微网功率发生变化时,通过控制变流器并网电流与交流母线之间交换功率,从而稳定直流微网的直流母线电压。

A control strategy of single converter connected DC microgrid and AC bus is proposed, which is aimed at balancing the active power of the DC microgrid.Firstly, the structure of the converter and its control system model un- der grid-connected operation are introduced.Secondly,the controlling principle and design methods of inner current loop and the outer voltage loop are analyzed.Finally, experimental results are introduced.h is proved that when active power need changed in the DC microgrid, this control strategy could stabilize DC bus voltage of the DC microgrid by controlling grid-connected current of the converter and exchanging energy with the AC bus.