Nonlinear control of a single phase shunt active filter connected photovoltaic systems via sliding mode

This paper presents the problem of controlling single-phase active power filter connected photovoltaic system via MPPT. We seek to meet a control strategy for the two following control objectives: i) ensuring the correction of the power factor (PFC) by eliminating harmonics generated by a non-linear load; ii) injecting in the power grid electric energy produced by solar panels, regulated by the MPPT. To achieve the above control objectives, a sliding mode control is designed as a nonlinear control technique applied in the inner loop and a simple proportional-integral (PI) controller is used in the outer voltage control. The System's stability is ensured by Lyapunov framework using system averaging theory. An experiment based on MATLAB/Simulink is designed to confirm the validity of proposed APF controller for this system.