基于STM32F373的光伏组件IV特性测试系统

PV Module IV Characteristic Test System Based on STM32F373

为准确方便测量光伏组件的IV特性曲线,设计一款基于STM32F373的光伏组件IV特性测试系统,可测量开路电压、短路电流、IV曲线、PV曲线等。该系统由电流控制单元、信号采集单元、软件处理单元、通信单元、上位机显示单元等组成,采用电子负载电路,以STM32F373单片机DAC输出来调节恒流的电流,同时采集光伏电池的输出电压,对采集到的数据进行卡尔曼滤波和曲线拟合,将电压、电流、功率生成IV、PV曲线显示在TFT彩屏上。该系统还可将数据远程传输到PC端进行数据分析与曲线观察。结果表明,该系统采集曲线准确且速度快,性能良好,采集一次IV曲线的时间仅需1 s,测量的电压电流误差小于1%。该系统体积小便于携带且内部带有锂电池,可充电,可在室外使用。

To accurately and conveniently measure the IV characteristic curve of photovoltaic modules,a photovoltaic module IV characteristic testing system based on STM32F373 is designed,which can measure open circuit voltage,short circuit current,IV curve,PV curve and so on.This system is composed of a current control unit,a signal acquisition unit,a software processing unit,a communication unit,an upper computer display unit and so on,and it adopts an electronic load circuit,which uses the STM32F373 single-chip DAC output to adjust the constant current current value.At the same time,it collects the output voltage value of the photovoltaic cell,performs Kalman filtering and curve fitting on the collected data,and generates IV and PV curves for voltage,current,and power values to be displayed on the TFT color screen finally.The system can also remotely transmit the data to the PC for data analysis and curve observation.The results show that the curves collected by using the system are accurate,fast,and have good performance,the time to collect an IV curve is only 1 s,and the measured voltage and current error is less than 1%.The system is small in size and easy to carry,and has a lithium battery inside,which can be charged and used outdoors.