Photovoltaic Boost Converter Control Operating in the MPPT and LPPT Modes

Aiming to generate the maximum power available in photovoltaic systems, maximum power point tracking (MPPT) algorithms are employed. However, with the increased penetration of photovoltaic systems in the grid, it is also necessary that these systems operate with limited power during voltage sags and overvoltage conditions. This paper presents a control method applied to a photovoltaic boost converter to provide a transition between the MPPT and limited power point tracking (LPPT) algorithms. This transition can help the photovoltaic inverter when is necessary to inject less energy to regulate the grid and interrupt the power injection during critical faults. The proposed control method was tested in a boost converter, using a power supply that emulates a photovoltaic module.