Anggriawan, Dimas Okky (2015) Rancang bangun sistem pendeteksian dan monitoring harmonisa menggunakan metode DFT. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Salah satu isu penting dalam analisis kualitas daya adalah untuk mendeteksi gangguan
kualitas daya secara efisien dan akurat sehingga dapat menyediakan pelayanan suplai
kualitas daya yang lebih baik kepada pelanggan. Keberadaan alat ukur saat ini
menggunakan fast fourier transform (FFT) dalam menganalisis harmonik tetapi FFT tidak
sesuai digunakan untuk mendeteksi sinyal yang non stasioner. Oleh karena itu, pada
penelitian ini mengusulkan metode Fast S-Transform (FST) untuk menganalisis kualitas
daya terutama harmonik karena FST memiliki komputasi yang lebih cepat. FST digunakan
untuk mengubah sinyal arus dan tegangan dari daerah waktu ke daerah frekuensi untuk
memperoleh komponen harmonik. Pada penelitian ini, diimplementasikan secara hardware
menggunakan mikrokontroller STM32F407. Eksperimen dibandingkan dengan metode
discrete fourier transform (DFT), Stockwell transform (ST), alat ukur standar FLUKE 43B
dan Osiloskop DL850. Hasil yang diperoleh dari pengujian THDi pada beban non linier dan
beban motor induksi memiliki kesalahan relatif sebesar 0,374284 % dan 0,548021 %
sedangkan hasil yang diperoleh dari pengujian THDv pada beban non linier dan beban
motor induksi memiliki kesalahan relatif sebesar 3,052288 % dan 5,073938 %
dibandingkan dengan FLUKE 43B. Metode FST memiliki waktu komputasi masingmasing
0,0855 detik, 0,731 detik dan 3,7001 detik lebih cepat dengan jumlah data sebesar
2000 data, 5000 data dan 10000 data dibandingkan dengan ST. ========== One of the important issues in the analysis of power quality is to detect power quality
disturbance efficiently and accurately so can provide service of power supply better quality
to customers. In general, the presence of measurement tools currently using fast fourier
transform (FFT) to analyze harmonics but FFT is not suitable for the detection of nonstationary
signals and often occurs of leak signal. Therefore, this paper proposes a method
of Fast S-Transform (FST) to analyze the power quality especially harmonics because FST
has good accuracy and faster computing. FST is used to change the current and voltage
signals from the voltage domain to the frequency domain to obtain the harmonic
components. In this paper, implemented in hardware using microcontroller STM32F407.
Experiment is compared with the method of discrete fourier transform (DFT), standard
measuring tools is FLUKE 43B and oscilloscope DL850. The results obtained from testing
of THDi on the non-linear load and the induction motor load has a relative error is 0.374284
% and 0.547021%, while the results obtained from testing of THDv on the non-linear load
and the induction motor load has a relative error is 3,052288 % and 5,073938 % compared
with FLUKE 43B. FST method has the computing time respectively is 0.0855 seconds,
0.731 seconds and 3.7001 seconds faster with the amount of 2000, 5000 and 10000 data is
compared with Stockwell transform.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSE 621.319 1 Ang r |
| Uncontrolled Keywords: | mikrokontroller; harmonik; kualitas daya; S-Transform; Fast S-Transform; microcontroller; harmonic; power quality; S-Transform; Fast S-Transform |
| Subjects: | Q Science > QC Physics > QC446.3.H37 Harmonics (Electric waves) |
| Divisions: | Faculty of Industrial Technology > Electrical Engineering > 20201-(S1) Undergraduate Thesis |
| Depositing User: | - Davi Wah |
| Date Deposited: | 12 Mar 2019 03:52 |
| Last Modified: | 12 Mar 2019 04:09 |
| URI: | http://repository.its.ac.id/id/eprint/62473 |
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