独立光伏发电跟踪系统的设计

Design of Independent Photovoltaic Tracking System

太阳能面板的输出特性随着辐照度和环境温度变化具有较强的非线性性,文章用经济简单的方法综合考虑辐照度和温度的影响,用光敏传感器采集太阳光角度信息经单片机处理后控制双轴机构,跟踪太阳方位角和高度角,用负温度系数热敏电阻动态调节主功率电路限流点,巧妙地实现宽温度范围内的最大功率点跟踪,以提高太阳能面板的利用率。

The output characteristics of the solar panel have a strong nonlinear with the lrracnance ano am- bient temperature changes, the open voltage, output current and the maximum output power of the solar panel will have corresponding changes. Analyzing the influencing factors-irradiance and environmental temperature, a tracing device-maximum power output tracker of a stand-alone PV system is designed. In the aspect of Irradi- ance, microcontroller is designed to process the sunlight angle information captured by the light sensors and then controls a two-axis mechanism to track the sun azimuth and elevation angle, so that the solar panel directly irradiated. In temperature, a negative temperature coefficient thermistor is used skillfully to adjust the limit current of the main power circuit dynamically to achieve a wide temperature range maximum power point track- ing. This paper considers the influence both of irradiance and temperature with a simple and economic method improving the utilization of the solar panel.