基于动态电容充电的光伏阵列I-V测试仪

Photovoltaic Array I-V Tester Based On Dynamic Capacitor Charge

光伏阵列Ⅰ-Ⅴ测试仪是一种对光伏阵列进行现场测试,从而为有效评价光伏电站的控制和设计水平提供参考实验数据的仪器。为获取光伏阵列的Ⅰ-Ⅴ曲线,系统测试时采用动态电容充电的方式,将电容作为可变负载接于光伏阵列的输出端,当光伏阵列给电容充电时,连续采样该时段内的电压电流就可得到当前环境条件下光伏阵列的Ⅰ-Ⅴ特性曲线。通过对光伏阵列进行实际测量的结果表明:该测试系统运行稳定、携带方便、测量精度较高,并且测量得到的伏安特性可以在液晶上直接以曲线的形式显示,从而使测得的阵列特性更为直观,能满足工程应用的需要。

The Photovoltaic ArrayⅠ-ⅤTester is a photovoltaic array on-the-spot testing equipment which can provide the reference exprimental data to evaluate the level of the photovoltaic power plant control and design.To obtain the IV curve of the photovoltaic array, the system adopted the method of the dynamic capacitor charge.The capacitor as a variable load was tooken on the output of the photovoltaic arrays.When the capacitor was charged up by the photovoltaic arrays,sampling the voltage and current in a row during that period can get the photovoltaic array IV curve in the current conditions.The experiment results showed that:this system operates stabely, carrys easily,has the high measruement accuracy,and the measurement ofⅠ-Ⅴcharacteristics can be directly displayed in the form of curve on the LCD.So that the characteristic of the array is more intuitive,and able to meet the needs of the application.