Abstract

Harmonics caused by capacitive loads were considered using the developed Shunt Active Power Filter (SAPF). The current harmonics are caused by the nonlinear characteristic of electronics-based equipment which increase power losses, and in turn reduce power quality. Switching signal generation was done using Space Vector Pulse Width Modulation (SVPWM). With an RC load under balanced input voltage conditions, the developed SAPF-SVPWM achieved a reduction of THD of 1.35% as compared to 35.46% before compensation. In addition, the developed SVPWM model was compared with SAPF without compensation using an RC load under unbalanced voltage conditions, and the results show that the developed SVPWM achieved a reduction in THD to 3.01% compared to 41.83% after compensation. The developed SVPWM model was also compared with Sinusoidal Pulse Width Modulation (SPWM) for balanced and unbalanced input voltage conditions. The results reveal that SVPWM performed better than SPWM. All the results obtained are within IEEE 519 harmonic limits with capacitive loads under balanced and unbalanced voltage conditions.