Abstract
Voltage harmonics, sag, and swell are the most harmful disturbances in distribution systems. This paper introduces a novel effective controller method for simultaneous compensation of both voltage sag/swell and voltage harmonics by using multifunctional dynamic voltage restorer. In proposed controller method called FFT with integrated ISRF, ISRF detects the magnitudes of voltage sag/swell quickly and precisely, and FFT extracts the selective components of voltage harmonics very effectively. The proposed method integrates the superior properties of ISRF and FFT methods. FFT integrated ISRF is applied for the first time to provide the compensation of both sag/swell and selective harmonics together. The proposed system has ability to compensate symmetrical/asymmetrical sag/swell and symmetrical/asymmetrical selective harmonics which are 5th, 7th, 11th and 13th. The controlled system is modelled in PSCAD/EMDTC and compared with conventional methods. The performance results verify that the proposed method compensates voltage disturbances effectively in the system.
Highlights
Current, frequency deviations, and waveform distortions that lead to equipment failure, monetary loss, and different negative consequences are known as power quality problems in distribution systems
While sag/swell causes the damage of electronic equipment and failure of systems, voltage harmonics induce overheating and losses in cables, transformers, and motors
This paper presents a novel reference generation selective voltage harmonics
Summary
Current, frequency deviations, and waveform distortions that lead to equipment failure, monetary loss, and different negative consequences are known as power quality problems in distribution systems. There are various custom power devices to cope with these problems in distribution systems Among these devices, Dynamic Voltage Restorer (DVR) is the most effective device to compensate these power quality problems. Functional DVRs in [9], [10], [11], [12], [13], [14], [15], [16], [17], [18], [19] and [20] These studies employ several reference generation methods to compensate multiple voltage disturbances at the same time. Which transforms 3-φ voltages to d-q components is symmetrical/asymmetrical used for symmetrical sag/swell and voltage harmonics. In the proposed study: Refss (ISRF) in order to compensate sag/swell with selective voltage harmonics ISRF method applied ivnVinas=ntah,bm,icsulsPptteriuorfcuudennsyisct tisionmaolrDe VacRc.urTahteeMaghar,5. First time to compensate both sag/swell and asymmetrical selective voltage harmonics, simultaneously
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