具有MPPT功能的光伏系统仿真

光伏发电受制于太阳能电池较低的转换效率，使得其最大功率点的跟踪，成为提高光伏发电效率的关键。通过对太阳能电池等效电路和输出特性的分析以及对最大功率点跟踪原理的研究，利用 Matlab/Simulink，并结合Boost 电路，构建了通用型的光伏系统仿真模型。该仿真模型采用扰动观测法跟踪太阳能电池最大功率，并对太阳能电池在环境温度、日照强度固定及动态变化情况下的最大功率点跟踪进行了仿真测试，测试当两者同时变化时，日照强度变化对太阳能电池输出功率的最大值影响比较大，其中当日照强度增大200,W/m2时其输出最大功率增幅达28%。仿真结果表明，该模型能够准确迅速地对太阳能电池的最大功率点进行跟踪。

Simulation Research on PV System with MPPT

Due to the relatively low conversion efficiency of photovoltaic cell, the maximum power point track-ing（MPPT） is absolutely necessary for photovoltaic system. Based on the analysis of equivalent circuit and output characteristic of solar panel and the principle of MPPT, a versatile boost converter-based photovoltaic system model was established by Matlab/Simulink. The maximum output power of photovoltaic system was obtained by using this model with the perturb and observe method under both steady and dynamic temperature and solar irradiation. Com-pared with temperature, solar irradiation has a more obvious impact on the output power of solar panel under dynamic temperature and solar irradiation. The output maximum power was increased by 28%when solar irradiation increased by 200 W/m2. The results indict that the simulation model can fast and accurately track the maximum power point of photovoltaic cell.