基于修正Newton迭代的MPPT方法研究

Research on MPPT method based on modified Newton iterative algorithm

针对传统最大功率跟踪(MPPT)方法中输出效率低、跟踪响应慢、容易出现误判的问题,提出了一种基于改进Newton迭代的MPPT方法。通过修正电池片的电气参数,得到功率曲线新的I-V约束方程,在新的约束条件下,利用改进的Newton迭代法进行求解,实时地输出最大功率。仿真结果表明,与传统的电导增量法相比,该方法有效地改善了输出效率,提高了跟踪速度,在环境突变的情况下,太阳电池阵的输出仍能够迅速达到最大功率点而不会产生误判。

Focused on the problems of low output efficiency, slow tracking response and miscarriage of justice of traditional MPPT （maximum power point tracking）, a new MPPT method based on modified Newton iterative algorithm was proposed for photovoltaic system. By modifying the electric reference of cells, the new I-V restriction equation of power curves was obtained. Based on the new restriction conditions, the maximum voltage was obtained by using modified Newton iterative algorithm. By using the new method, the power can reach to the maximum power point quickly and adapt to rapid changes in the insulation and temperature. The simulation results show that compared with the conventional incremental conductance method, the proposed approach can effectively improve output efficiency and MPPT speed; the solar array output can quickly reach maximum power point without miscarriage of justice.