基于对偶相切和Lagrange插值的高压光伏MPPT算法

High voltage photovoltaic MPPT algorithm based on dual tangent and Lagrange interpolation

为了提高高压光伏发电系统中最大功率点跟踪(MPPT)的速度、精度以及跟踪到最大功率点(MPP)后运行的平稳度,提出一种对偶相切与Lagrange插值相结合的改进MPPT算法。该算法利用对偶切线法的快速性和Lagrange插值法的近似拟合作用,迅速将参考电压定位到最大功率点附近,最后以极小的步长运行到MPP。仿真结果表明:所提出的改进MPPT算法与传统扰动观测法相比,能够更快速、精准地追踪到最大功率点,并以更小的波动持续地输出最大功率,有效地减少了光伏发电系统的功率损失,提高了太阳能的利用率。

In order to improve the speed and accuracy of maximum power point tracking(MPPT),and the smoothness of operation after tracking to the maximum power point(MPP)in high-voltage photovoltaic power generation systems,an improved MPPT algorithm combining dual tangent and Lagrange interpolation was proposed.The algorithm utilized the rapidity of the dual tangent method and the approximate fitting effect of the Lagrange interpolation method to quickly locate the reference voltage near the maximum power point,and finally run to the MPP with a very small step size.The simulation results show that compared with the traditional disturbance observation method,the proposed improved MPPT algorithm can track the maximum power point more quickly and accurately,and continuously output the maximum power with smaller fluctuations,which effectively reduces the power of the photovoltaic power generation system.loss,and improve the utilization rate of solar energy.