一种低成本、高效率的光伏电源系统研究

Study of a low cost highly efficient photovoltaic power system

介绍了光伏电源系统的特性、最大功率点跟踪基本原理和Boost-buck变换电路,提出了一种模糊控制法太阳能电池最大功率点跟踪控制方法,即将太阳能电池板和Boost-buck变换电路作为一个整体,直接根据检测到的负载功率变化来控制占空比,这些改进简化了系统。实验结果表明,该系统在日照强度、环境温度及负载电阻变化较大时仍然能够快速、准确地跟踪到太阳能电池板的最大功率点,并满足软开关条件,具有较好的稳定性。

The characteristics of photovoltaic power system, the mechanism of Maximum Power Point Tracking （MPPT）and Boost-buck converter are introduced. Then a novel DSP-based,fuzzy control MPPT system is presented.It takes PV module and Boost-buck converter as a whole and directly control the duty cycle of the Boost-buck converter according to the load power change,thus reducing the system complexity,and it is also the main difference between this method and the technology used in the past.The experimental results show that the proposed system can track the MPP quickly, exactly, and steadily,irrespective of the irradiation, temperature and load resistance change.