改进的光伏系统扰动观测法在MPPT控制中的应用

MPPT Simulation of an Improved Disturbance Observer Method

光伏电池的最大功率一直是光伏发电领域关注的重要问题之一。光伏电池输出的非线性决定了其最大功率点的时变性,为此,提出了一种改进的扰动观测法,即当光伏系统输出功率第一次出现跃变时(即前一时刻的功率值大于后一时刻的功率值)系统采用模糊控制法继续进行最大功率点跟踪。通过Matlab对光伏电池模型的仿真,与扰动观测相比,提出的方法稳定性更高,响应时间较短,震荡幅度较小,提高了对最大功率的跟踪精度和速度。

The maximum power of photovoltaic battery has always been an important issue of concern in the field of photovoltaic power generation.Nonlinear features of the output characteristics of photovoltaic cells decide that the maximum power point varies all the time.To this end,this paper proposes an improved disturbance observation method.Upon first appearance of saltus,namely,when the former moment after the power is greater than the moment,the system uses fuzzy control method to track the maximum power point.By Matlab simulation model for photovoltaic cells,the method was compared with the disturbance observer and was proved as having higher stability,shorter response time and smaller volatility,which improves its maximum power tracking accuracy and speed.