三相交错并联同步Buck的光伏充电控制器

Photovoltaic Charging Controller Based on Three-phase Interleaved Synchronous Buck

针对光伏发电系统中太阳能电池利率低、蓄电池常因充电不当而损坏的问题,分析了光伏电池的输出特性和蓄电池的充电特性。设计了一个具有最大功率点跟踪(MPPT)的光伏充电控制器系统,并搭建了硬件平台。该系统以dsPIC33F16GS502为主控MCU,采用三相交错并联同步Buck电路为充电主电路。软件编程采用4阶段充电策略对蓄电池进行充电控制,实现了蓄电池在MPPT、恒流、恒压不同充电方式之间的智能切换。其中恒流恒压充电阶段采用了PI算法,快充阶段使用了基于改进的扰动观察法和电导增量法相结合的算法。实验结果表明,最大功率点跟踪能快速跟踪外界环境的变化,并稳定在最大功率点,提高了光伏电池的使用效率,保护了蓄电池,延长了蓄电池的使用寿命。

Aiming at the problems of under utilization of photovoltaic panels and damage of batteries caused by misuse in photovoltaic power generation system, a photovoltaic charging controller with maximum power point tracking is designed after analyzing the photovol- taie panel output characteristics and charging characteristics. The system takes the dsPIC33F16GS502 as the core, and adopts three-phase interleaved synchronous Buck circuit as its main charging circuit. The four-stage charging method is used to control the battery charging, and the intelligent switch between MPPT,constant current and constant voltage is achieved using the software program. The experimen tal results indicate that the system can track the maximum power point quickly, the efficiency of PV array can he improved, the life span of the battery can be prolonged.