光伏电池最大功率点跟踪方法比较

摘要

According to engineering mathematics model of solar photovoltaic cells,a simulation model of photovoltaic cells was established in Matlab,influences of changed light intensity and temperature on output characteristics of the photovoltaic cells were analyzed.In view of problem that it is difficult to get higher tracking accuracy and response speed by use of perturbation and observation method which applied fixed perturbation step,an improved perturbation and observation method based on variable step was proposed.Through simulating photovoltaic cells control system,simulation curves of the two methods of maximum power point tracking were compared.The simulation results show that the photovoltaic cells control system can track maximum power point more quickly and has better stability at maximum power point by use of the improved perturbation and observation method.%根据太阳能光伏电池的工程数学模型,在Matlab环境下建立了光伏电池仿真模型,分析了光照强度和温度变化对光伏电池输出特性的影响.针对扰动观察法采用固定的扰动步长而难以获得较高跟踪精度和响应速度的问题,提出了一种基于变步长的改进的扰动观察法,并通过对光伏电池控制系统进行仿真,比较了这2种最大功率点跟踪方法的仿真曲线.结果表明,采用改进的扰动观察法的光伏电池控制系统能更快速跟踪最大功率点,且在最大功率点处稳定性较好.