基于改进模糊控制和优化Boost电路的光伏MPPT方案

摘要

针对光伏电池的物理模型和输出特性,分析扰动观察法的原理和不足,提出一种基于改进模糊控制优化Boost电路的光伏MPPT实现方案.对模糊控制器的输入和隶属函数的选取以及隶属函数的分段进行优化改进,通过调节 Boost 电路的占空比来寻求光伏电池的最大功率点.在 MATLAB 中建立系统仿真模型,设置不同的实验测试条件,比较2种MPPT方案在动态速度和稳态精度上的控制效果.仿真结果表明:当光照强度和环境温度发生突变时,新型MPPT控制的跟踪精度和响应速度均高于传统方法,可控性好.%Based on the physical model and output characteristics of the photovoltaic cell, the principle and shortcomings of disturbance observation method were analyzed, and a scheme based on improved fuzzy control and optimized Boost circuit for realizing photovoltaic maximum power point tracking (MPPT) was proposed in this paper. The input of fuzzy controller, the selection of membership function and the segmentation of membership function were optimized, and the maximum power point of photovoltaic cell was obtained by adjusting the duty cycle of Boost circuit. The system simulation model was established in MATLAB. Under different experimental testing conditions, the control effects of two kinds of MPPT schemes in dynamic speed and steady state accuracy were compared. The simulation results show that the tracking accuracy and response speed of the novel MPPT control method are higher than those of the traditional method when the light intensity and ambient temperature change suddenly, which is with better controllability.