基于双向DC-DC变换器的超级电容器储能系统研究

Research on a Supercapacitor Energy Storage System Based on Bi-Directional DC-DC Converter

介绍了超级电容器的经典RC模型,详细分析了双向DC-DC变换器的工作原理及控制策略。构建了基于双向buck-boost电路的超级电容器储能系统模型,并进行了验证实验。实验结果表明不论是模拟直流母线电压波动实验还是单相两级式光伏发电系统突加、突减负载实验,超级电容器都能够工作在优化的充放电状态,使得储能系统能够很好地抑制直流母线电压波动,从而提高整个系统的稳定性。

The classical RC model of a supercapacitor is presented.The work principle and control strategy of the bi-directional DC-DC converter are analyzed in detail.The supercapacitor energy storage system on the basis of the bi-directional buck-boost converter is developed and experimental study is carried out.The experimental results show that the supercapacitor can operate in the optimal charge or discharge state and the energy storage system can restrain effectively the DC-bus voltage fluctuation so that the system stability is improved no matter when the hardware simulation is implemented or when the load changes suddenly in the single-phase two-stage PV generation system.