微元步长自适应增量电导法实现MPPT的控制

Infinitesimal Step Adaptive Incremental Conductance Method MPPT Control

为了更大程度的提高光伏发电系统的最大输出功率,通过对光伏电池功率、电压(P-U)特性的数学建模分析,在增量电导法的基础上,提出最大功率跟踪控制算法(MPPT)——微元步长自适应增量电导法.改善了传统增量电导法步长选择不确定性的弊端.通过引入变步长控制因子k,以微元步长Δd自适应的跟踪最大功率点.在Matlab/Simulink环境下进行了仿真验证.结果表明该算法明显缩短了跟踪时间,并且有效地抑制了系统在最大功率点(MPP)附近的振荡现象,提高了系统的跟踪速度和精度.

In order to improve the maximum output power of photovoltaie power generation system effectively, a new method based on the incremental conductance method that maximum power point tracking control algorithm （MPPT）- the ele- mentary step adaptive incremental conductance method was innovated by analyzing the character of power and voltage （P-U） of photovoltaic cells. It perfects the defects that the step choice uncertainty of traditional incremental conductance method by in- troducing a variable step length control factor k, and track maximum power point （MPP） using the method of adaptive infini- tesimal step length d. The validity of the algorithms is verified in computer simulation. It indicated that the algorithms can not only shortens the tracking time, but also control the oscillatory phenomenon of system near MPP, and improve the velocity and precision of tracking.