局部遮挡条件下的最大功率点跟踪

Maximum power point tracking under partially shaded isolation conditions

最大功率点跟踪(MPPT)算法在光伏发电系统中具有至关重要的作用,只有当光伏阵列工作在最大功率点时,才能将光伏阵列的利用率最大化。当光伏阵列受到外界灰尘、阴影等遮挡时,原来的单极值问题会转化为多极值问题,传统的MPPT算法可能收敛到局部最大值,而非全局最大值。本文在现有的MPPT算法上改进,提出了一种新的MPPT策略,将跟踪过程细分为4个阶段,针对每个阶段使用不同的跟踪算法。仿真实验证明,该方法既有处理多极值问题的能力,还有收敛速度快,无多点振荡的优点。

Maximum Power Point Tracking（MPPT） plays an important role in photovoltaic（PV） systems.The PV array’s utilization would not be maximized until it is operated at the maximum power point.When the PV array is partially shaded by dust or shadow,the unique extremum problem would turn to a multiple extremes problem.The traditional MPPT algorithms may converge to a local maximum power point,rather than the real maximum power point.A novel MPPT algorithm based on MPPT algorithms available is proposed in this article.The tracking process is divided into four stages.In each stage,a specific method is used.Simulation results prove that this algorithm can not only handle multiple extremes,but also has the advantage of great convergence rate and no oscillation in the vicinity of the maximum power point.