DG-Grid Interfaced System with Shunt Active Filter Functions

This paper deals with the control of active and reactive power while compensating voltages of a distributed generation (DG)-grid interfaced with energy storage shunt active power filter (APF). The APF control is based on reference current estimation in d-q reference frame. The proposed APF control system is capable for controlling the active power supplied by the distributed generation system while compensates load power factor and harmonics. The active power exchange is based on phase angle between APF inverter and grid voltages and reactive power control is based on magnitude of their voltages. The wide simulation of the study is carried out under MATLAB /Simulink environment to illustrate the effectiveness of the control algorithm. Various simulation results are offered with integrated mode (forward and reverse power flow) of operation of distribution generation system with utility grid.