PRIMA SUMARTA, -
DESAIN PENGGUNAAN VARIABLE FREQUENCY DRIVE (VFD)
PADA STRATING-UP MOTOR INDUKSI 3 FASA
MENGGUNAKAN METODE SINUSOIDAL
PULSE-WIDTH MODULATION
(SPWM).
JURNAL Al-AZHAR INDONESIA SERI SAINS DAN TEKNOLOGI.
ISSN p – ISSN : 2087-9725 e – ISSN : 2355-8059
Abstract
During the start up process, the induction motor has a fairly high starting current. It can even
reach four to eight times the motor's nominal current. An initial current that is large enough and repeated
over a short period of time can cause quite high heat in the motor wire coils and trigger a current break. This
occurs due to heat accumulating in the motor system. So repeated incidents within a short period of time can
result in damage to the coils and other motor components. To overcome this, a Variable Frequency Drive
(VFD) is used which works by periodically increasing the voltage frequency so that it is able to turn off the
current at start up time intervals or is called the Soft Starting method on motors. The VFD modeling design
is carried out based on the SPWM topology with the output parameters of current rotation, THD and reactive
power. Test results show that motor performance using a VFD is able to reduce current to 110% from
previously 620%, reduce Total Harmonic Distortion (THD) from 5.01% to 3.54%, and reduce motor reactive
load from 14.31kVar to 8.kVar with capacitance value 121.78πF.
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