Harmonic Mitigation Using Passive Filters in 3-Phase Inverters to Improve Power Quality on Microgrid

Harmonics are sinusoidal components of a periodic wave that have a frequency that is an integer multiple of the fundamental frequency of the periodic wave. If there is a superposition between the fundamental frequency wave and the harmonic frequency wave, a distorted wave is formed so that the wave shape is no longer sinusoidal. The cause of harmonics is non-linear loads, one of which is the use of an inverter which functions as a converter of a DC source into an AC source. To reduce the Total Hamonic Distortion (THD) produced by the Inverter, a passive filter is used, one of which is an LC passive filter, the results of which comply with current and voltage harmonic limits based on IEEE standard 519-2014. From the results of research using a passive LC filter, the THD produced by the inverter at the distributed generation terminal is 31%. After installing the LC passive filter, the THD was 0,6%. For the LC passive filter, the calculations show that the inductor (L) value is 98 mH and the capacitor (C) is 100 μF.