Technique for online tracking of a utility harmonic impedance using by synchronising the measured samples. Issue 5 (1st April 2016)

• Record Type: Journal Article
• Authors: Zebardast, Abolfazl; Mokhtari, Hossein
• Is Part Of: IET generation, transmission & distribution. Volume 10:Issue 5(2016)
• Page Start: 1240
• Page End: 1247
• Publication Date: 2016-04-01
• Subjects: power supply quality -- power system harmonics -- phasor measurement; online tracking technique -- utility harmonic impedance estimation -- electrical networks power quality -- harmonic sharing determination -- point of common coupling -- PCC -- intentional disturbances -- natural load fluctuations -- synchronous measurements -- reference point phase‐angle -- utility impedance calculation error -- utility harmonic impedance parameters; Electric power production -- Periodicals; Electric power transmission -- Periodicals; Electric power distribution -- Periodicals; 621.3105
• DOI: 10.1049/iet-gtd.2015.0874
• Languages: English
• ISSNs: 1751-8687

Abstract

Abstract : Utility harmonic impedance estimation is an important stage for the study and control of electrical networks power quality such as harmonic sharing determination between a utility and a customer at a point of common coupling (PCC). In this estimation, non‐invasive methods, as compared with invasive methods, are more desirable since they do not need to apply intentional disturbances to the power network and can work based on natural load fluctuations. The only concern about such methods is the method accuracy. These methods require simultaneous and synchronous measurements of the voltage and current at the PCC. However, one of the causes of error in the utility harmonic impedance measurement is the reference point phase‐angle variations. This is the point with respect to which the electrical parameters are measured and any deviation in the reference point phase‐angle may result in utility impedance calculation error. In this paper, a new technique is proposed in order to remove synchronisation samples problem and perform online tracking of the utility harmonic impedance parameters. The performance of the proposed technique is compared with that of other non‐invasive methods using simulation studies. The proposed method is applied to a real case with real field measurements under different conditions.