基于功率预测的变步长扰动观察法MPPT控制策略研究

Research on Variable Step Perturbation and Observation Control Method based on Power Prediction for MPPT

摘要:

针对传统扰动观察法存在步长选择困难和“误判”问题，提出了一种基于功率预测的变步长扰动观察法MPPT复合控制策略。该算法首先通过功率预测法判断扰动的方向，避免“误判”，然后再通过变步长扰动观察法对最大功率点进行精确定位；在Matlab/Simulink平台上搭建MPPT仿真模型，仿真结果表明：该算法在追踪最大功率点过程中，不但具有良好的动态性能，而且有效改善了传统扰动观察法存在的振荡和“误判”问题，对提高太阳能的利用率有一定积极意义。

Abstract:

In view of the difficulties in the selection of step size and the problem of "miscarriage of justice", a variable step perturbation and observation control method based on power prediction is proposed. Firstly, the algorithm is used to determine the direction of the perturbation by the power prediction method, and then avoid the "miscarriage of justice". Then, the maximum power point is precisely positioned by the variable step perturbation observation method. The simulation model is based on the Matlab/Simulink platform. The algorithm not only has good dynamic performance in tracking the maximum power point, but also effectively improves the oscillation and "miscarriage" problem in the traditional disturbance observation method, which has positive significance to improve the utilization rate of solar energy.