光伏发电系统中改进型MPPT控制技术研究

Research on Improved MPPT Control Technology Used in Photovoltaic Power Generation System

对光伏发电系统提出了一种新的最大功率点跟踪(MPPT)控制方法。对固定电压法、电导增量法以及所提的两者的结合方法分别进行仿真,结果表明,所提方法能够快速、准确地跟踪光伏阵列的最大功率点,减少了在最大功率点振荡的能量损失,提高了光伏发电系统的能量转换效率。

A MPPT（Maximum Power Point Tracking）control method of PV（Photo Voltaic）generation system is proposed,which applies CV（Constant Voltage）method to adjust the working point of PV array near the MPP（Maximum Power Point）for fast tracking when external conditions or loads change suddenly,and uses CI（Conductance Increment）method with small-step to optimize the steady state characteristic of MPP for effective reducing the output power oscillation around MPP. The CV, CI and proposed methods are simulated respectively and results show that, the proposed method tracks the MPP exactly and quickly and improves the energy conversion efficiency of PV generation system by reducing the output power oscillation around MPP.