光伏电池的自适应占空比扰动MPPT算法研究

Research of adaptive duty cycle perturbation MPPT algorithm for photovoltaic cell

环境温度、光照强度和负载等因素对光伏电池的输出特性影响很大,为了提高光伏电池的工作效率,需要准确快速地跟踪光伏电池的最大功率点。在分析了光伏电池的输出特性的基础上,建立了光伏电池的仿真模型;针对传统爬山法的不足,采用了自适应占空比扰动法对最大功率点进行了跟踪控制。给出了上述两种算法的工作原理及设计过程。仿真结果表明:自适应占空比扰动算法跟踪迅速,减少了系统在最大功率点附近的振荡现象,提高了系统的跟踪速度和精度。

Photovoltaic cell output characteristics are affected greatly by temperature,light intensity and load factors.in order to improve the utilization efficiency of photovoltaic cells,it requires fast and accurate tracking and controlling the maximum power point.on the basis of analysis the output characteristics of photovoltaic cell,the simulation model of photovoltaic cell was established.Aiming at the shortage of hill-climbing,Adaptive duty cycle perturbation method of maximum power point tracking control was adopted.the design process and working principle of both algorithms were given.The simulation results show that compared with hill-climbing,the Adaptive duty cycle perturbation method can track maximum power point fast,reduce the system oscillation at the maximum power point,and improve the speed and accuracy of the PV systems.