Active and Reactive Power Control and Quality Management in Dg-grid Interfaced Systems

ABSTRACT The main focus of this paper is to control the active power supplied by distributed generation (DG) system while compensating harmonics and reactive currents caused by the nonlinear loads using shunt active power filter (APF). The APF control is based on load currents sensing for reference current estimation in a-b-c reference frame. In order to get the grid currents sinusoidal and in-phase with the distorted grid voltages, the positive sequence components of the grid voltages are computed. The active power transfer is based on phase angle between DC-AC converter and grid voltages and reactive power management is based on magnitude of these voltages. The extensive simulation of the study is carried out under MATLAB /Simulink environment to show the usefulness of the control algorithm. Various simulation results are presented with integrated modes (forward and reverse power flow) of operation of distributed generation system interfaced with grid.