Farklı Gürültü Değerlerine Sahip Gerilim Düşümü Sinyallerinin Hızlı Fourier Dönüşümü ile Harmonik ve Toplam Harmonik Bozulum Değerlerinin İncelenmesi

Öz

Gerilim düşümü sinyali en temel Güç Kalitesi (GK) bozulumu olaylarından biridir. Normal gerilim değerinin 0.1-0.9 p.u. birim değerde (per-unit) düşmesi olarak tanımlanmaktadır. Bu GK bozulumu sinyali sistemdeki hassas cihazların zarar görmesine yol açabilmektedir. Bu yüzden gerilim düşümü sinyalinin detaylı analizinin yapılması gereklidir. Harmonik analizi ve Toplam Harmonik Bozulum (THB) değerleri bu sinyalin belirlenmesi ve detaylı olarak incelenmesi için kullanılır. Bu çalışmada farklı gürültü değerlerine sahip gerilim düşümü sinyalinin harmonik büyüklükleri ve THB değerleri incelenmiştir. Harmonik büyüklükleri ve THB değerlerinin hesaplanması için Hızlı Fourier Dönüşümü (HFD) kullanılmıştır. Elde edilen sonuçlar yüksek gürültü değerlerinin harmonik dağılımlarının değişmesinde ve THB değerinin yükselmesinde oldukça etkili olduğunu göstermiştir.

Anahtar Kelimeler

• Gerilim düşümü
• gürültü
• harmonik analizi
• hızlı fourier dönüşümü

Investigation of Harmonic and Total Harmonic Distortion Values of Voltage Sag Signals with Different Noise Values by Fast Fourier Transform

Öz

The voltage sag signal is one of the most basic Power Quality (PQ) disturbance events. It is defined as a 0.1-0.9 p.u. per-unit decrease in the normal voltage value. This PQ disturbance signal can cause damage to sensitive devices in the system. Therefore, a detailed analysis of the voltage sag signal is necessary. Harmonic analysis and Total Harmonic Distortion (THD) values are used to determine and analyze this signal in detail. In this study, harmonic magnitudes and THD values of the voltage sag signal with different noise values were investigated. Fast Fourier Transform (FFT) was used to calculate harmonic magnitudes and THD values. It is observed that the harmonic distributions and total harmonic distortion values of the signal at different time intervals change with the variation in noise.

Anahtar Kelimeler

• Voltage sag
• noise
• harmonic analysis
• fast fourier transform
• total harmonic distortion

Kaynakça

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