A Variable Voltage MPPT Control Method for Photovoltaic Generation System

摘要

To increase the output efficiency of a photovoltaic (PV) generation system it is important to have an efficient maximum power point tracking (MPPT) technique. This paper describes the analysis, design and implementation of an efficient tracking method for a stand-alone PV generation system, which automatically adjusts the reference of output voltage to track the maximum power point (MPP) by using the expiatory program. Compared with the conventional constant voltage (CV) method, the proposed approach can effectively improve the tracking speed and accuracy simultaneously. Furthermore, an improved control system is designed for the pulse-width-modulation (PWM) inverter to achieve the objective of MPPT. Theoretical analysis and principle of proposed method are presented and simulation results are given to verify the validity of control method.