独立光伏系统蓄电池优化三段式充电策略研究

摘要

To improve the charging efficiency and the lifetime of the storage battery in the stand-alone photovoltaic system, the charging algorithm of storage battery is studied. In consideration of the photovoltaic system is easily to be impacted by the environment, and the power generated is unstable, the reason caused failure of implementing 3-stage charging by using PI algorithm is analyzed, thus the charging strategy combining maximum power point tracking (MPPT) and 3-stage charging is proposed. PI constant current, constant current charging and the switching criteria of MPPT charging are researched emphatically. The result of Matlab simulation verifies the correctness of the algorithm.%为了提高独立光伏系统蓄电池的充电效率和使用寿命,对蓄电池充电算法进行了研究.考虑到光伏系统受环境影响较大、发电功率不稳定等因素,分析了直接利用PI算法实现三段式充电失败的原因,提出了将最大功率点跟踪(MPPT)与三段式充电相结合的充电策略.重点研究了PI恒流、恒压充电与MPPT充电的切换判据.Matlab仿真结果证明了该算法的正确性.