滞环控制的变步长MPPT算法实验研究

为了延长光伏电池使用寿命和和提高光伏电池发电效率,利用基于恒定电压法的变步长滞环控制法,通过分析光伏电池受光照强度的影响和在最大功率点附近的功率特性确定了电压扰动步长值,并分别在MATLAB/Simulink仿真平台上建立了MPPT仿真模型和在硬件电路测试的数据基础上对该算法进行了验证。仿真和实验的结果表明,该算法能在光照变化较快的情况下仍能实时地跟踪光伏电池的输出功率,并能有效的抑制在MPP点附近的振荡现象,表现出很好的动态和稳态特性,证明了该算法的有效性和正确性。

Research and experiment of Variable Step MPPT Based on Hysteresis Loop Algorithm

For extending the longevity and improving the efficiency on power generation of photovoltaic cells , a variable step algorithm based on constant voltage and hysteresis loop control method is proposed and the voltage disturbance step value in this article is determined according to the analysis to the influence of light intensity for photovoltaic cells and the power characteristics of near maximum power point. By the block of MATLAB and the data of the experiment ,the simulation model of photovoltaic cells and variable step MPPT are built in the article and the strategy is verified. The simulation results and the testing data show that the algorithm can track power output of photovoltaic cells in real time well despite the fast changes of light, and can effectively suppress oscillations near the MPP, which has good dynamic and steady-state characteristics and confirms the validity and correctness of the algorithm.