SAPF Application with the Instantaneous Power Theory for Unbalanced Load in Power Systems

In multiphase and single-phase electrical power circuit systems, nonlinear elements in the cause harmonics. Harmonics reduce the quality of electrical systems, by adversely affecting them. Undesirable fluctuations emerge in current and voltage signals. Harmonic elimination methods are used to reduce these negative effects. These methods are divided into two types as active and passive. In this study, the design of a series active power filter (SAPF), which is one of the active elimination methods in unbalanced electric loads, is explained. THD ( total harmonic distortion ) values occurring in voltage were investigated, by examining the cases, where SAPF was enabled and disabled, separately. These types of filters aim to eliminate harmonics by transmitting in the opposite phase and equal magnitude harmonic voltage signals to harmonics. In the design of SAPF, Akagi’s Instantaneous Power Theory was utilized. With the Instantaneous Power Theory, possible delays in time are prevented. The switching circuit elements were checked by the hysteresis tape control method