基于TMS320F2812和BUCK电路的光伏阵列模拟器

采用TMS320F2812 DSP为控制器，BUCK电路为主电路，研究与设计了一种新型光伏阵列模拟器.模拟算法利用模拟器负载电流与阵列特性电流的差值控制BUCK电路开关的占空比，调节模拟器输出电压，使模拟器的工作点逐步逼近光伏阵列I-V特性的工作点，实现对光伏阵列输出特性的模拟.阵列的特性电流值由存贮于DSP中的工程数学模型，根据选定的不同光照量和环境温度条件计算得到.MATLAB仿真和模拟器样机的实验结果表明，本文模拟器的逼近与稳定时间约为80 ms，仅为传统逐点逼近法的25%，且超调小于4%，稳态误差小于1%，均优于传统逼近法，且能够实现光伏阵列不同I-V特性曲线的完整模拟.

A New Kind of Photovoltaic Array Simulator Based on TMS320F2812 DSP and BUCK Circuit

A new kind of photovoltaic array simulator utilizing TMS320F2812 DSP as the controller and Buck circuit as the main circuit was put forward. The simulation algorithm controls the duty cycle of the electronic power switch in buck circuit by utilizing the difference of actual load current of the simulator and the characteristic current of photovoltaic array, and then adjusts the output voltage of the simulator so as to make the operating point of the simulator approximate the working point of photovoltaic array on the I-V characteristic curve. In DSP, the mathematical model of the I-V characteristic curve for the kind of photovoltaic cell array was stored. The characteristic current can be calculated by means of the model corresponding to different quantity of illumination (S) and ambient temperature (T). A lot of simulating and experiment results have shown that the simulator can simulate perfectly the I-V characteristic curves of photovoltaic array with outstanding performances. Its approximate and stable time is about a quarter of the time for traditional point by point approximate. The approximate error is lower by 4% and the overshoot is lower by 1%.