双向DC/DC控制器研究 日照区时，光伏发电系统提供负载能量，同时多余的能量通过DC 给蓄电池充电；日影区时，蓄电池通过DC给负载提供能量。-Bidirectional DC/DC controller of photovoltaic power generation system Rizhao area, providing load energy, the excess energy through the DC to charge the battery　the shadow area, the load is supplied by battery energy DC.