独立光伏系统中锂电池管理的研究

Design of The Lithium Battery Charge and Discharge Control Device of The PV System

能源危机的加剧使得光伏电能的应用越来越受到人们的重视,成为新能源利用的主流之一。对于一个完备的独立光伏直流应用系统,除了光伏电池、锂电池、负载之外,锂电池充放电控制器只不可或缺的,锂电池充放电控制器通过对锂电池电压电流的检测,对锂电池组充放电电压电流进行控制和规定。本设计是以AT89C51单片机为核心的锂电池充放电控制装置的系统,通过对AT89C51单片机软件编程可以实现以下基本要求:(1)锂电池恒流恒压充电;(2)锂电池的电量检测;(3)锂电池恒流放电。

Because of the energy crisis,Photovoltaic power is more and more important for people,and it has become one of the mainstream new energy.But PV cells iS a kind of nonlinear sources,So a whole of PV power system must be contained a charging and discharging controller except photovohaic cells,Lithium battery and load.The controller is the core of the PV system,it can control the Charging and discharging current and vohage.This design is based on the system of lithium battery＇s charging and discharging control device . The core of this system is the single-chip microcomputer AT89C51. By programming the single-chip microcomputer AT89C51 software, we can implement the following basic requirements： 1, the constant current and constant voltage of lithium battery＇s charging. 2, the detection of lithium battery＇s power capacity. 3, the constant current of lithium battery＇s discharging.