高效能光伏充电系统研究

针对光伏充电系统存在的缺陷，提出了一种增强型最大功率点跟踪（MPPT）控制方法。该方法以负载获取最大功率为系统性能评价标准，将太阳能电池和控制器作为整个系统，蓄电池作为负载，并以充电电流为采样信号，利用DC-DC升压变换电路实现最大功率点跟踪，使负载始终工作于最大功率点。实验结果表明，该充电系统电路简单、控制灵活、转换效率高，在日照强度急剧变化时仍能保证负载的最大功率输入。

Study of high-efficiency PV charging system

Aiming at the disadvantages of current PV charging system, an enhanced control method of maximum power point tracking （MPPT） was presented. The evaluation of the system performance was to have the load acquire maximum power. The PV module and controller were looked as a whole system, battery was regarded as load, charge current was used as sampling signal, and the duty cycle of DC-DC converter was directly controlled to realize MPPT. The experimental results show that the proposed system is convenient, flexible control, and it can warrant high system efficiency. The load power can keep maximum irrespective the large-scale change of irradiation.