独立运行光伏发电系统电流环自适应给定的MPPT控制

MAXIMUM POWER POINT TRACKING CONTROL WITH ADAPTIVE SETTING OF CURRENT LOOP SET POINT FOR STAND-ALONE PHOTOVOLTAIC GENERATION SYSTEMS

本文在光伏阵列数学模型及特性分析的基础上,给出了结构简单且便于实现MPPT控制的系统结构.针对现有MPPT控制方法的不足,给出了一种电流环自适应给定的MPPT控制算法.这种算法采用自适应变步长扰动方法,根据功率变化自动调节电流扰动步长,可满足MPPT控制的快速性和准确性要求.仿真结果验证了该方法的可行性和正确性.

A architecture for stand-alone photovoltaic generation systems, which has simple structure and is convenient to implement MPPT （maximum power point tracking） control,is given by analyzing mathematic model and characteristics of photovoltaic array in this paper. To overcome the drawbacks of existing MPPTs, a maximum power point tracking control with adaptive setting of current loop set point ,which adapts variable step size perturbation algorithm and adjusts current loop set point according to power change, is put forward to achieve faster and more accurate response in MPPT control. Simulation results show that the proposed algorithm in the paper is practical and correct.