| Abstract |
Today, the main theory for the design of APF (Active Power Filter) control for non-linear three-phase
loads compensation has been the instantaneous reactive power theory. Since 1983 when p-q original
theory appeared, there have been proposed many different formulations applied to the APF control.
However, the compensation strategies derived from the different instantaneous reactive power
formulations present a different behaviour when unbalanced and non-sinusoidal source voltages are
applied to three-phase four-wire systems.
In this paper, the behaviour of different APF control algorithms got from the five most relevant
instantaneous reactive power formulations, according to the outstanding publication, is analysed. They
are p-q original, d-q transformation, modified or cross product formulation, p-q-r reference frame and
vectorial formulation. A platform of simulation with control + APF + load to test the different
algorithms has been built. The results got in the following three cases were compared: balanced and
sinusoidal, unbalanced and sinusoidal, and balanced and non sinusoidal source voltage. The analysis
of results from the five formulations proved that only the vectorial one allows to get balanced and
sinusoidal currents after compensation. |
