新型占空比直接控制的光伏MPPT研究

摘要

在分析光伏电池数学模型和输出特性的基础上,结合Boost电路,针对最大功率点跟踪(MPPT)进行了研究,提出一种新型变步长占空比直接控制方法,该方法有跟踪和稳态两种工作模式,根据环境的变化切换工作模式.利用Matlab/Simulink仿真软件进行了仿真研究,与传统控制方法的对比结果表明,提出的控制方法具有跟踪速度快、控制精度高,稳态运行无波动和易于实现等优点,同时降低了系统的经济成本.实验结果也表明了该方法的可行性.%Based on the analysis of the mathematical model and the output characteristics of the photovoltaic cells,combined with Boost circuit, a new method of variable step directly duty ratio controlling method was proposed aim at the Maximum Power Point Tracking (MPPT). This method has two modes of tracking and steady-state,can change mode according to work environmental. This method was simulated by Matlab/Simulink. Compared with other classical control methods, the new method has advantages of fast tracking, high precision,steady-state operating without fluctuation,easy to implement,and reduced the economic cost of the system. The result of experiment shows feasibility of the method also.