基于Boost电路光伏发电系统MPPT采样周期分析

Analysis of MPPT Sampling Period of the Boost-based Photovoltaic Power Generation System

由于光伏发电系统的非线性特性,难以运用数学手段确定其最大功率跟踪MPPT(maximum power pointtracking)过程输出功率的合理采样周期。针对基于Boost电路光伏发电系统进行MPPT过程,对工作点输出功率最佳采样周期进行仿真和采样,分析了全过程采样周期的分布规律。分析表明,不同环境条件下,最佳采样周期最大值近似为恒定值,因而选取该恒定值作为适合于MPPT全过程的采样周期,保证了MPPT算法的跟踪速度和跟踪精度。

Due to the nonlinearity of photovoltaic power generation system,it is difficult to determine a proper sampling period at each operating point in the maximum power point tracking（MPPT）mathematically. Based on the simulation and sampling of the optimal sampling period during MPPT for the Boost-based photovoltaic power generation system,this paper analyses the distribution pattern of the sampling period. It is indicated that since the maximum of optimal sampling period approximates to a constant value under different environmental conditions,this value is selected as the proper sampling period for the whole process of MPPT,which ensures the tracking speed and precision of MPPT.