模糊控制的扰动观察法在光伏MPPT中的应用

Fuzzy Logic Control Based Perturb and Observe MPPT of Photovoltaic System

为了提高光伏电池的能量转换效率,要用到最大功率点追踪(MPPT)控制方法。针对传统光伏发电系统中MPPT的问题,提出了模糊控制的扰动观察法(P&O)的方法。此方法将模糊逻辑控制器应用于扰动观察法中。通过Matlab/Simulink仿真详细描述了模糊逻辑控制器的设计步骤,并搭建了光伏发电系统的各个仿真模型,通过对比模糊控制的扰动观察法和传统的扰动观察法的仿真结果,验证了新方法能减小最大功率点附近振荡的功率损耗,且具有跟踪速度快的优点。

In order to improve the efficiency of the energy transforming of photovoltaic （PV） cell, maximum power point tracking （MPPT） is implemented into the PV system. Aiming at disadvantages of the conventional perturb and observe in PV system, an novel method was proposed for the maximum power point tracking using a fuzzy logic controller based perturb and observe. This method uses a fuzzy logic controller applied to perturb and observe. The different steps of the design of this controller in PV system were presented together with its simulation in Matlab/ Simulink. Results of this simulation were compared to those obtained by the conventional perturbation and observation controller. The results show that the novel method can reduce power loss in finding the maximum power point than the conventional perturbation and observation method. What＇s more, it has the advantage of faster tracking speed.