Power quality improvement in 3-Φ grid connected photovoltaic system with battery storage

The paper presents a study of power quality (PQ) improvement in a 3-Φ grid connected photovoltaic (PV) system. The variable step perturb & observe (VS-PO) maximum power point tracking (MPPT) scheme has been used to force the PV generation reach the maximum power operation. A battery energy storage system (BESS) via a bi-directional DC/DC converter is introduced in the DC bus to maintain the DC bus voltage level at a constant value. A 3-Φ hybrid filter is connected into the utility grid to compensate the reactive power and the load current harmonics, generated by the non linear load. Control strategy of hybrid filter is based on the vectorial theory dual formulation of instantaneous reactive power. The performance study is simulated under variations of solar insolation and loads.