Advanced Control and Observation of Shunt Active Power Filter Connected to PV System

We consider the problem of controlling single-phase shunt active power filter operating in presence of nonlinear loads. The filter is connected to PV system; this latter provides the active power to load. The main control objectives are: (i) compensation of harmonics current and the reactive power caused by the nonlinear load; (ii) regulation of the output voltage of PV system to track its reference provided by the MPPT block. The problem is dealt with a nonlinear controller involving two regulators in cascade. The PFC regulator is developed by using the Lyapunov technique to cope with the compensation issue based on the estimated grid voltage values provided by an observer. The outer-loop regulates the output voltage of PV system. The proposed controller performances are confirmed by simulation in MATLAB.