Series active power filter design for unbalanced conditions

Nonlineer elements of single phase and three phase system cause harmonics. These harmonics effect the system, cause to fall performance of the system, makes increase and decrease at the current and voltage of the system. Harmonic filters used for decreasing the harmonics. Harmonic filters composes of two categories which are active filters and passive filters. At this study series active power filter (SAPF) design and simulation at the unbalanced conditions were explained as an active filter. Researching about the SAGF design,control, control methods, simulation and performance in 3-phase 3-wire systems. Analyse the total harmonic distortion of the voltage without harmonic filter and with the harmonic filter. These filters give voltage harmonics to the system in the opposite phase and equal value that the system produces to prevent harmonics. SAPF is more effective for the nonlineer loads behave as voltage harmonic sources. SAGF simulated for three condititions with there circuits. At first circuit balanced voltage and same load for each phases present, at the second circuit unbalanced voltage and same load for each phases present, and finally last circuit unbalanced load for each phases present. In this way SAPF filters voltage harmonics and make voltage regulation. In this study Akagi?s Instantaneous Power Theory used for design. Instantaneous power theory doesn?t cause any time delay while filtering harmonics. Hysteresis control method is used for control the switching elements. Matlab simulink program made the design of the SAPF and gave the results.