New optimization in photovoltaic installations with energy balance with the three-phase utility

The paper propose a new maximum power point tracking (MPPT) system built in the control block, useful for three-phase (4 wires) photovoltaic (PV) generators connected to the utility. The system can be connected directly to the PV panels, avoiding the use of DC/DC converters. The number of sensors is reduced. The MPPT algorithm establishes an energy balance between the DC and AC sides through the DC bus voltage control. The three-phase inverter output currents are controlled using a hysteresis-band control. The simulated results show the control loop dynamic response and stability against the most typical perturbations. The PV panel model used in the simulation is described.