光伏系统中储能电源充放电特性应用分析

摘要

Battery is an important part in photovoltaic system.Its quality directly affects the reliability of the whole photovoltaic system.Charging and discharging performances of lead-acid battery and lithium-ion battery were analyzed by using different charging modes and different discharge modes.The results shows that due to the influence of light intensity, the charging current trend of the lead-acid battery and lithium-ion battery were basically the same in the early stage of charging with the solar panel, but the charging efficiency of the lithiumion battery was obviously better than that of lead-acid battery in the later period of charging.The over discharge protection voltage of lead-acid battery and lithium-ion battery in photovoltaic system were different.Then the best over discharge protection voltage of batteries in the photovoltaic system were identified.%储能电源是太阳能光伏系统中的重要部件, 其电化学性能直接影响整个光伏系统的可靠性.通过利用不同充放电循环方式对铅酸蓄电池和锂离子电池的充放电性能进行了实验分析.结果表明, 利用太阳能电池板充电时, 由于受光强的影响, 铅酸蓄电池和锂离子电池充电前期, 充电电流趋势基本一致;充电后期, 锂离子电池充电效果明显优于铅酸蓄电池;不同储能电源在光伏系统负载条件下过放电保护电压存在差异性, 进而确定了光伏系统中储能电源的过放电最佳保护电压值.