基于SG/Simulink的一种改进MPPT算法

针对传统MPPT算法响应速度慢和追踪精度不够理想的特点，分析了光伏电池在不同环境下的输出特性，提出一种改进的变步长扰动观测法，即采用新的自适应步长公式 作为扰动步长，使光伏电池以较大步长快速接近最大功率点，然后以较小步长稳定于最大功率点。在SG/Simulink混合建模仿真平台下进行了仿真，所得结果表明算法可显著提高最大功率点追踪速度与精度。

An Improved MPPT Algorithm Based on SG/Simulink

Aiming at the problems that tracking speed and precision are not ideal in the traditional MPPT algorithm,the output characteristics of PV cells under different environment were analyzed,and an improved variable step size perturbation method is proposed.The algorithm use the new adaptive step size formal as the disturbance step length.It makes the photovoltaic cells in large steps to quickly approach the maximum power point, and then in a smaller step to stabilize the maximum power point.Finally,the simulations are carried out under the SG / Simulink hybrid modeling and simulation platform. The results show that the algorithm can significantly improve the maximum power point tracking speed and accuracy.