摘要
最大功率点跟踪控制（Maximum Power Point Tracking,MPPT）技术可以使光伏系统工作在最大功率点处,从而提高光伏系统的发电效率。本文首先对光伏MPPT算法进行了分类及其性能进行比较,针对传统变步长算法存在跟踪死区,导致光伏系统的启动性能和跟踪性能变差的缺陷。本文提出一种基于自适应变步长模糊控制实现最大功率点跟踪算法,即用模糊控制语言实现功率开关管的控制。结果表明该方法相比传统的扰动观察法能够快速、准确跟踪到最大功率点,具有较好的动态和稳态性能,提高了光伏系统输出功率的效率,降低跟踪过程中的能量损失,最后,总结目前模糊控制算法在光伏系统MPPT中的应用情况。
Maximum Power Point Tracking （MPPT） technology can make the PV system work at the maximum power point and enhance the power generation efficiency ofphotovoltaic systems. In this paper, an adaptive variable step size fuzzy control is proposed to realize the maximum power point tracking algorithm. The fuzzy control language is used to realize the control of the power switch. The results show that the proposed method can quickly and accurately track the maximum power point. It has better dynamic and steady state performance, improves the efficiency of the output power of the PV system and reduces the energy loss in the tracking process. Finally, this paper summarizes the application of fuzzy control algorithm in PV system.
关键词
光伏电池
最大功率跟踪
变步长
模糊控制
photovoltaic cells
maximum power point tracking
variable step size
fuzzy control
