采用混合储能装置的独立光伏系统研究  

Research on hybrid energy storage for a stand-alone photovoltaic system

作　　者：易芳[1] 易灵芝[1] 杜小娟[1] 

机构地区：[1]湘潭大学信息工程学院,湖南湘潭411105

出　　处：《电源技术》2013年第3期419-421,共3页Chinese Journal of Power Sources

基　　金：国家发改委发改投资2011(1952)号

摘　　要：外部环境的不稳定性,对光伏发电系统的输出电能造成影响,为了提高光伏发电系统的稳定供电能力,建立了一个以超级电容器和蓄电池为混合储能单元的独立光伏发电供电系统,通过对双管双向变流器的控制,实现光伏发电系统直流母线与超级电容器和蓄电池之间的能量流动,有效地稳定了供电系统的输出电压;另外根据蓄电池的结构特性,建立了非线性数学模型,通过PID控制改变双向功率变换器的占空比来控制蓄电池组的充电电流,实现分段恒流充电,使蓄电池始终处于优化的充放电状态。The instability of the external environment affect the output power of photovoltaic system.In order to improve the stable power supply capacity of photovoltaic system,an independent photovoltaic system with battery and supercapacitors serving as its energy storage unit was established.Through the control of the Bi Buck-Boost converter,the energy flow between the DC bus with supercapacitor and battery was realized,which could effectively stabilize the output voltage of the power supply system.In addition,according to the structural characteristics of the battery,a nonlinear model was established.Through the PID control to change the duty cycle of converter and control charging current,battery charging current was adjusted to track maximum charging current,reduce battery charging time and extend battery life,and keep the battery charge and discharge in the optimal state.

关 键 词：双向变换器 储能 独立光伏发电系统 超级电容器 

分 类 号：TM53[电气工程—电器]