A Three-Phase Grid-Connected PV Generation System with a Constant Voltage Based Maximum Power Point Tracking

This paper utilizes the characteristic that the maximum power point (MPP) voltage of a solar panel can be regarded as an approximate constant value, and applies the linear relationship between the MPP voltage and the open-circuit voltage for photovoltaic (PV) modules to assist the maximum power point tracking (MPPT) in a three-phase grid-connected PV generation system. A simple technique to identify the range of approximate MPP voltages and then to determine a constant MPP voltage is suggested to do a constant voltage based control on the PV panels for the MPPT in the paper. Some experimental tests are also conducted and discussed.