Simplified active power and reactive power control with MPPT and islanding detection for three-phase grid-connected photovoltaic inverters

This proposed the simplified active power and reactive power control with the maximum power point tracking (MPPT) and an islanding detection for three-phase grid-connected photovoltaic (PV) inverters. The observation method is used for the simple MPPT algorithm and the input current command on the rotating reference frame is regulated by the feedback and feedforward controller. In order to assure the all maximum power is transferred to the grid, the active power command is calculated from the PV maximum power. Moreover, the simple current injection for islanding detection and protection are also proposed. Validity of the proposed grid-connected inverter is confirmed by simulation.