基于自适应滑模层极值搜索的光伏发电最大功率跟踪方法

Maximum Power Point Tracking Method for Photovoltaic Systems Using Adaptive Extremum Seeking Control Based on Sliding Layer

保证光伏阵列快速到达最大功率点并且能稳定运行,一直以来是光伏发电研究领域关注的重要问题之一。为此,文中提出了基于参数自适应调整滑模层极值搜索控制的光伏发电系统最大功率跟踪新方法。首先证明了基于滑模极值搜索的光伏发电系统最大功率跟踪控制策略的稳定性;然后提出采用具有更低控制频率及更低控制噪声的滑模层函数代替简单的开关函数。在此基础上,进一步提出了控制参数的自适应调整方法,使得控制系统在具有较好的控制品质的同时,避免了繁琐的人为参数调整。算例证明了所提方法的有效性。

How to ensure a photovoltaic array to track the maximum power point and operate stably has always been one of the important issues in the field of photovoltaic power generation.To address this issue,a new maximum power point tracking(MPPT)method is proposed by using an adaptive parameter adjusting method and extremum seeking control based on the sliding layer.Firstly,the stability of the MPPT method using the extremum seeking control based on the sliding layer is proved.Secondly,to overcome the chattering phenomenon caused by high frequency switching,a sliding layer function with lower frequency and lower noise is introduced to substitute for the traditional simple switching function.On this basis,an adaptive adjusting method for control parameters is further presented to achieve higher control quality while avoiding complicated manual parameter adjustment.Simulation results show the effectiveness and validity of the strategy proposed.