光伏发电中基于拉格朗日插值法的最大功率点跟踪

Maximum Power Point Tracking of Photovoltaic Power Generation Based on Lagrange Interpolation

为了克服传统导纳增量法和扰动观察法存在的缺陷,提出了基于拉格朗日插值法的最大功率点跟踪方法.该方法将定步长与变步长相结合,提高了追踪最大功率点的准确性、快速性.利用MATLAB/Simulink建立仿真模型,在不同的起始电压和步长的情况下,追踪光伏电池的最大功率点.仿真结果表明:改进后的拉格朗日插值法在最大功率点跟踪控制过程中,跟踪精确且快速.

In order to overcome the defects of traditional incremental conductance method and perturbation and observation method, the maximum power point tracking method based on Lagrange interpolation was put forward in the paper. This method improved the speed and accuracy of maximum power point tracking by combining constant step length with variable step length. Matlab/Simulink was used to build the simulation model to track maximum power point of the photovoltaic battery in different initial voltage and step length. The simulation results show that the improved Lagrange interpolation method is accurate and rapid in the control process of maximum power point tracking.