摘要
光伏板是对太阳能的有效利用手段,而最大功率跟踪则是优化此手段的重要途径。就目前来看,扰动观测法是MPPT应用较为广泛的一种方法,但传统扰动观察法存在跟踪速度与能量波动损失问题,针对于此,设计一种变步长自适应MPPT跟踪方法。该方法利用前后时刻功率差值作为占空比调节因子,并且设定阈值,留取一定的功率波动裕量,有效解决了上述存在问题,在此之外还能够进行自适应控制。通过Simulink建模仿真分析,与传统方法进行比较,得出该方法在跟踪的稳定性、快速性、与能量损耗减少方面具有明显优势。
Photovoltaic panels are effective means of solar energy utilization, and maximum power tracking is an important way to optimize this method. At present, the disturbance observing method is a widely used method of MPPT. However, the traditional disturbance observing method has the problems of tracking speed and energy fluctuation loss. In view of this, a variable step adaptive MPPT tracking method is designed. The method uses the power difference between the front and the rear moment as the duty cycle adjustment factor, and sets the threshold value, leaving a certain power fluctuation margin, which effectively solves the above existing problems;besides, it can also carry out adaptive control. By Simulink modeling and simulation analysis, compared with the traditional methods, the conclusion is drawn that the method has obvious advantages in terms of tracking stability, rapidity and energy loss reduction.
