中小型独立光伏系统控制器存在的问题及改进

对当今中小型独立光伏系统控制器存在的主要问题进行了分析，针对两个主要的问题：光伏控制器的自身损耗过高，蓄电池荷电状态检测不够准确，提出了一些解决的方法。其中，包括两个原创的技术：用有源整流代替防逆充二极管；电流置零检测法。

The existing problems and improvement about the small and medium-sized independent photovoltaic system controller

In this paper, the major drawbacks of current controller of medium or small sized isolated photovoltaic system is discussed. The two major drawbacks are that the power consumption of the controller itself is too high and that the checking rezult of battery SOC（state of charging） is not accurate enough. Some methods are devoloped to overcome these drawbacks, in which include two original methods： using synchronous rectifier instead of diode of anti-inverse charging; battery SOC checking with setting charging current to 0.