带修正函数的模糊控制在光伏发电MPPT中的应用

Fuzzy controller with correction function applied in MPPT of photovoltaic power generation

由于太阳能电池转换效率较低,因此要及时、精准地跟踪光伏电池的最大功率输出。文章针对光伏电池的非线性特性,在电导增量法和模糊控制技术的基础上引入了修正函数进行最大功率跟踪。利用Matlab仿真分析,比较了常规模糊控制法和所设计的模糊控制法的性能。仿真结果表明,采用带修正函数的模糊控制,在外部环境变化时,能快速准确地跟踪最大功率输出,输出功率波动小,具有较好的鲁棒性。

To remedy the defect of the low transformation efficiency of photovoltaic cells, the maxi- mum power output of photovoltaie cells needs to be tracked timely and accurately. Based on incre- mental conductance and fuzzy control, a correction function is introduced due to the non-linear char- aeteristics of photovohaic cells. The performances of conventional fuzzy control and the designed fuzzy control method are compared by simulation. The results indicate that the designed fuzzy control method can track the maximum power output point rapidly and accurately when the external environ- mental changes, and the output power has small fluctuation. The system has good robustness.