PQ and DQ control methods against voltage disturbances for Shunt Active Power Filter – A Comparative Study

With the emergence of power electronics-based sources, nonlinearities and imbalances in the current power grid originate not only from loads, but also from power supply. This paper examines two distinct control techniques for shunt active power filter for harmonic compensation against source disturbances. The investigated methods are the instantaneous real and imaginary power theory (PQ), and the synchronous reference frame method (DQ). The primary objective is to compare and contrast each compensation method’s dynamic response of the source current’s total harmonic distortion THD. All the simulations are carried out in MATLAB/Simulink and show that the DQ control method yields better results for all conducted tests, except for the test of frequency variations where both control methods fail to maintain a tolerable THD.