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: The production of electrical energy by photovoltaic solar (PV) energy has experienced strong growth and remarkable developments in recent years because this energy source is clean, and non-polluting. However, connecting the photovoltaic system to the electrical grid can cause numerous harmful impacts on network operation. Among these, the most significant effect is injecting harmonics into the grid. The main objective of this study is to control a photovoltaic system connected to the grid to improve energy quality and minimize the harmful effects of this connection.

In this paper, we presented the generalities of a photovoltaic system study and simulation, and then we inserted the DC-DC converter to raise the voltage level and improve the operation of the PV panel by pursuing the operating point at maximum power, the technique used is the perturb and observer (P&O). Connection to the network is done by inserting a three-phase voltage inverter with pulse width modulation allowing synchronization with the network and operation at unity power factor.

A cascaded control structure with an outer DC-link voltage control loop and an inner current control loop is used. The currents are controlled in a synchronous orthogonal d, q frame using a decoupled feedback control. The reference current of the proportional-integral (PI) d-axis controller is extracted from the DC-side voltage regulator by applying the energy balancing control. Furthermore, to achieve a unity power factor, the q-axis reference is set to zero. Finally, at the photovoltaic panel, simulation results showed the efficiency of the pursuit of the maximum power point of the proposed MPPT control for different levels of changing irradiation and temperature. The PI controller for the continuous bus has proven its effectiveness in all operating conditions. At the grid level, the control is used for regulating reference currents to inject maximum active power into the electrical grid.