太阳能光伏发电被认为是当今世界极具发展前景的新能源技术之一。对独立光伏发电系统而言，需要铅酸蓄电池为负载提供电能。为了保护蓄电池同时又保证负载正常、安全、可靠地运行，对用户型光伏发电与市网无缝互补自动切换装置进行了设计。该系统装置由电压信号检测、电压信号比较和外围控制电路3部分组成。系统通过比较被检测的电池板两端电压和最低工作电压(可设定)的大小关系，实现市电和光伏发电系统无缝互补和自动切换。系统结构简单、成本低廉，具有广泛的应用价值。%Nowadays, solar photovoltaic power generation is considered as one of the new energy technologies having very promising prospects in the world. For stand-alone photovoltaic power generation system, lead-acid storage batteries are needed for supplying electric energy to the load. To protect batteries while ensuring load running normally, safely and reliably, the seamless complementary automatic switching device for user type photovoltaic power generation and utility power grid is designed. The systematic device is composed of three parts, i. e. , voltage signal detection, voltage signal comparison, and peripheral control circuit. Through comparing the magnitude relationship of the detected voltage on both ends of the panels and the minimum operating voltage ( settable) , seamless complementary and automatic switching for utility power grid and photovoltaic power generation system can be implemented by the system. The system features simple structure, low cost, and possesses wide application value.
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