Paper Information

Title: 

MEASUREMENT OF FLICKER AND HARMONIC USING INDIRECT DEMODULATION METHOD AND SUITABLE FILTER

Type: PAPER
Author(s): TABATABAEI YAZDI HOSSEIN*,ESFROGHY HOSSEIN
 
 *FACULTY OF ENGINEERING, FERDOWSI UNIVERSITY (MASHHAD)
 
Name of Seminar: INTERNATIONAL POWER SYSTEM CONFRENCE
Type of Seminar:  CONFERENCE
Sponsor:  SHERKATE TAVANIR
Date:  2004Volume 19
 
 
Abstract: 

FLICKER AND HARMONIC ARE TWO OF THE MAJOR POWER QUALITY DISTURBANCES IN POWER SYSTEM. ACCURATE AND EFFECTIVE DETECTION OF THEM IS IMPORTANT AND HELPING FOR BETTER COMPENSATION AND ELIMINATION OF THEIR HARMFUL EFFECT. FLUCTUATING LOADS (I.E. ELECTRIC ARC FURNACES, ARC WELDERS, ETC.…) WILL RESULTS IN FLICKER AND HARMONIC IN POWER SYSTEM.
IN THIS PAPER AN EFFECTIVE CALCULATION METHOD IS INTRODUCED WHICH HELPS TO MEASURE FLICKER AND HARMONIC AT THE SAME TIME. IN THIS METHOD, BY USING INDIRECT DEMODULATION TECHNIQUE, THE RMS VALUES OF VOLTAGE WAVEFORM ARE FIRSTLY CALCULATED. THEN BY USING THE FAST FOURIER TRANSFORM (FFT) ALGORITHMS, FLICKER IS OBTAINED WHICH HELP US TO CALCULATE THE FLICKER ACCUMULATED DOSE (G(T)). AND FINALLY BY USING BAND – PASS CHEBY CHEF FILTER, THE DISTURBANCE WITH HIGH AND LOW FREQUENCY IS ELIMINATED, FOR ACCURATELY MEASURING HARMONIC.
USING THIS METHOD INCREASES THE SPEED AND ACCURACY OF FLICKER AND HARMONIC MEASUREMENTS.

 
Keyword(s): POWER QUALITY, FLICKER, HARMONIC, FLICKER ACCUMULATED DOSE, INDIRECT DEMODULATION
 
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