储能型光伏发电系统中蓄电池充电控制策略研究

Research on charging control strategy for batteries of photovoltaic power generation system with storage

蓄电池达不到理想的使用寿命是制约储能型光伏发电技术广泛应用的主要因素.基于MPPT理论研究和蓄电池充电特性,设计了双级DC/DC变换器用于控制光伏充电系统,采用一种更为合理的充电控制策略,其依据在充电过程中检测到的相关参数,使MPPT与阶段式恒流充电相互转换.对系统进行了仿真与实验验证,结果均表明该控制策略可在充电后期根据电池端电压大小自动地切换充电方式,使蓄电池充电过程有了更高效的管理,延长了蓄电池的使用寿命.

Limited life of batteries is the main factor that restricts the photovoltaic power generation technology to be widely used.Based on the theory research of MPPT and the characteristics of battery charging,the system structure of the dual stage DC/DC converter to control the photovoltaic charging is designed.A more reasonable charging control strategy is adopted,which can convert the MPPT and the stage constant current charge according to the relevant parameters detected during the charging process.Simulation example and experimental verification results are given to demonstrate the control strategy can automatically switch the charging mode according to the terminal voltage of batteries in the later charging period,provided a more efficient management for the battery charging process,prolonged the service life of the battery.