一种扰动观察法在光伏发电MPPT中的应用

Application of perturbation and observation method in MPPT of photovoltaic power generation

分析了光伏电池的特性和扰动观察法的优缺点,针对扰动观察法步长难确定和光伏电池最大功率点两侧具有非对称性的特点,提出了一种改进扰动观察法。将该方法应用于光伏电池的最大功率跟踪,仿真和实验结果均表明该方法能在外界环境变化的情况下,保证光伏电池快速、精确地跟踪最大功率点,稳态精度较高,提高了光伏电池的利用率。

According to the asymmetric characteristics of photovoltaic array and the disturb to determine the step size of perturbation and observatio-n method（PO）, a new optimized PO was proposed. Applying this method to MPPT of PV cells, simulation and experimental results show that this new method improves the utilization of PV cells with rapid and accurate MPPT track under the change of ambient condition.