Analisis Reduksi Harmonisa pada Variable Speed Drive Menggunakan Filter Pasif LC dengan Beban Motor Induksi Tiga Fasa

Abstract

A three-phase induction motor is the main drive for machines in the industrial world. ]his is due to an induction's motor have some advantages, but it still has to be considered in using this application since its speed control ,SJJstem is highly influenced by its efficiency. For the most part, the device used as the speed control qf the three-phase induction motor rotation is Variable Speed Drive (VSD) which is a non-linear load 1he use of non-linear load will yield current wave and distorted sinusoidal pressure. From measurement data, the using MATLAB!Simulink program with a LC.filter connected in parallel to the circuit, it was found that harmonics order which is not in line with standard IEC61000-3-2 Class D Filter. }'ram the result ~f the simulation, it was obtained that LC filter with C value= 15 µF and L .~ 0.28H can decrease the total ~f harmonics distortion (THD) to become smaller (7HDi decreasesfi'om 3.5% to 0.46% or reduces 3,04%, and THDi decreases.from 102.9% to 35.39%, or reduces up to 86,73%). This indicates that LC jilter can he used to reduce harmonics current in the Variable Speed Drive.