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Harmonic power flow calculations for a large power system with multiple nonlinear loads using decoupled approach

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Authors
Ulinuha, Agus
Masoum, Mohammed
Islam, Syed
Date
2007
Type
Conference Paper

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Citation
Ulinuha, Agus and Masoum, Mohammed and Islam, Syed. 2007. Harmonic power flow calculations for a large power system with multiple nonlinear loads using decoupled approach, in Proceedings of the Australasian Universities Power Engineering Conference (ed), AUPEC 2007 Australasian Universities Power Engineering Conference, Dec 9 2007, pp. 882-887. Perth, WA: Curtin University of Technoklogy.
Source Title
Conference Proceedings of the 2007 Australasian Universities Power Engineering Conference
Source Conference
Australasian Universities Power Engineering Conference 2007
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Faculty
School of Electrical Engineering and Computing
Department of Electrical and Computer Engineering
Faculty of Science and Engineering
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Copyright © 2007 IEEE. This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.

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Abstract

Power flow calculation is normally carried out for fundamental frequency. Due to the extensive use of nonlinear loads, harmonic frequencies are present and need to be also considered. Unfortunately, unavoidable complexity and heavy computation burden are often encountered by involving nonlinear loads into the calculation. Multiple nonlinear loads typically employed in the real system will further weigh the computation down. This paper implements a decoupled approach to overcome the problem. The couplings between harmonics are rationally disregarded enabling separate calculations for every harmonic order. This will greatly reduce the complexity level and computation burden. However, the accuracy of this technique is somehow questioned due mainly to the neglected harmonic couplings. The accuracy of the implemented decoupled harmonic power flow (DHPF) algorithm is investigated by simulating the distorted IEEE 18-bus system and comparing the results with those generated by standard packages (e.g., HARMFLOW and ETAP). The implementation is then extended for the IEEE 123-bus system including multiple nonlinear loads.