双级式光伏系统最大功率点跟踪研究

光伏电池的输出功率随外部环境和负载的变化而变化.为充分发挥光伏器件的效能,需采用最大功率点跟踪(MPPT)电路.根据MPPT的基本原理和常用光伏发电系统控制的优缺点,主电路采用了Boost电路结构,结构简单,硬件实现方便.控制部分在经典干扰观测方法的基础上对控制方法进行改进,采用变步长跟踪,克服了跟踪速度与跟踪精度之间的矛盾.实验结果证明,该方法能够快速、准确地跟踪太阳能电池的最大功率点.

Research on MPPT of the Double-stage PV System

The output power of photovoltaic(PV) module varies with module temperature,solar insolation and loads.So it is necessary to track the maximum power point(MPP) of the PV array all the time.According to the mechanism and con-trol methods of maximum power point tracking(MPPT),the Boost topology is used in the control circuit.In the controlling part,a new improved method is used based on the perturbation and observation method to prevent the shortcoming of classical method.This method can track the MPP changes ...