光伏实时跟踪及数据采集系统

An integrated real time tracking and data acquisition photovoltaic system

本文设计了一个集太阳方位跟踪和实时数据采集于一体的光伏发电系统。利用光敏器件发送的反馈信息来实时调整和控制步进电机以跟踪太阳方位。提出了"等待太阳法"的电机控制策略,以达到降低运动损耗、提高发电效率的目的。给出了光伏阵列的电压、电流等采样电路,由单片机采集数据并通过RS-232串口通讯传至上位机.对跟踪式和固定式光伏阵列进行了比较,结果显示,跟踪式光伏阵列的发电效率较之固定式提高了约23%。

This paper provides a method to develop a PV system which combines sun tracking with real time data acquisition. The position and ＂status＂ of the sun are detected by some light-dependent resistors （LDRs）. The MCU calculates the difference between two symmetry LDRs, and then drive motors to make sure that the PV is vertically irradiated by the sun. At the same time, the MCU calculates the Open-circuit voltage Voc, Short-circuit current Isc, output power Pro, Etc. The MCU transfer these data to PC thought the port RS-232. In the end of this paper, a comparison between the stationary system and trucking system is made, and the result shows that the Energy improved about 23% by trucking the sun.