Power quality enhancement in single phase energy distribution systems using DQ optimal control

This work presents the direct current control scheme of shunt active power filter with an LCL output filter of a single phase energy distribution system feeding nonlinear loads connected at the PCC using an LQR. The model of SAPF-LCL is carried out in D-Q frame and the controller with added integral action is designed to compensate harmonics of the nonlinear loads and to keep the DC bus voltage at its reference value. Simulation and preliminary experimental results carried out confirmed the best performance in steady state of the implemented controller and the good tracking in dynamic regime to load and source voltage variations and robustness to large variation of source inductance.