基于改进扰动观察法的光伏阵列MPPT研究

Maximum Power Point Tracking of Photovoltaic Array Based on Improved Perturb and Observe Algorithm

针对常规扰动观察(P&O)法由于环境快速变化带来的失效性问题,提出一种基于改进P&O法的最大功率点跟踪(MPPT)算法。采用一种压阻可变的方法模拟光伏阵列的输出特性。改进P&O法通过控制Boost变换器的占空比改变变换器的输入电压,从而实现MPPT。以DSP芯片TMS320LF2407A为控制电路主处理器,以Boost变换器为主拓扑电路,搭建了模拟光伏阵列MPPT实验系统。实验结果表明,该改进算法能有效地跟踪光伏阵列最大功率点(MPP)。

An improved perturb and observe（P＆O） algorithm can track the maximum power point（MPP） during rapidly changing irradiation conditions.The output characteristics of the photovohaic （PV） array are simulated conveniently by changing both voltage and resistance method.This improved P＆O algorithm can track the MPP through controlling the duty cycle of the Boost converter.An principle sample, consisted with Boost converter and DSP chip TMS320LF2407A, is built to verify the validity of the tracking process of the MPP during rapidly changing irradiation conditions.The ex- perimental results show the improved P＆O algorithm can effectively track the MPP.