一种新型光伏阵列模拟器的设计研究

The New Design of the Photovoltaic Array Simulator

在设计离网或并网运行的光伏发电系统时,如果使用真实的光伏阵列,不仅成本高、难度大,而且也难以实现各种环境条件下系统的运行状况。本文提出了一种利用虚拟仪器和恒流源等设备组成光伏阵列模拟器的快速设计方法。首先,通过对光伏电池的物理特性的分析,提取出光伏的数学模型。在Matlab环境下将实际测得的光伏特性曲线与由数学模型得到的曲线相比较,仿真结果证明该数学模型能够很好的模拟实际光伏输出。该方法利用数据采集卡对负载的电压进行检测,通过计算光伏阵列的数学模型得出模拟光伏阵列的输出电流,最后通过GPIB总线控制恒流源,由此也实现了基于恒流源的光伏阵列模拟器。

It＇s not only difficult and high cost, but also uneasy to simulate the photovoltaic system＇s operating state in all kinds of ambient conditions when we use the real photovoltaic array to design a grid-connected photovoltaic system or an off-grid photovoltaic system. A quick method for design the photovoltaic array simulator which is used of the LabView environment and the current source is introduced in this paper. Firstly, the physical characteristic of the photovoltaic array is analyzed, and then its mathematical model was figured out. Comparing the characteristics curve measured from the real photovoltaic array and the curve calculated from the mathematical model in the MATLAB environment, it turns out that the mathematical model can simulate the real photovoltaic array very well. In this paper, LabView is used to measure the voltage of the load, and then, the mathematic model is used to calculate the output current of the array simulator, finally, we can control the current source by GPIB. So it proves the feasibility of this photovoltaic array simulator.