Technique for online tracking of a utility harmonic impedance using by synchronising the measured samples

Abolfazl Zebardast; Hossein Mokhtari

Technique for online tracking of a utility harmonic impedance using by synchronising the measured samples

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Author(s): Abolfazl Zebardast ¹ and Hossein Mokhtari ²
- Affiliations: 1: Department of Electrical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran ;
  2: Department of Electrical Engineering, Sharif University of Technology, Tehran, Iran
Source: Volume 10, Issue 5, 07 April 2016, p. 1240 – 1247
DOI: 10.1049/iet-gtd.2015.0874 , Print ISSN 1751-8687, Online ISSN 1751-8695

Received 16/07/2015, Accepted 22/10/2015, Revised 11/10/2015, Published 07/04/2016

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.

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Technique for online tracking of a utility harmonic impedance using by synchronising the measured samples

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