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Three-Phase Unbalanced Optimal Power Flow Using Holomorphic Embedding Load Flow Method

Author

Listed:
  • Bharath Varsh Rao

    (Electric Energy Systems—Center for Energy, AIT Austrian Institute of Technology, 1210 Vienna, Austria)

  • Friederich Kupzog

    (Electric Energy Systems—Center for Energy, AIT Austrian Institute of Technology, 1210 Vienna, Austria)

  • Martin Kozek

    (Institute of Mechanics and Mechatronics—Faculty of Mechanical and Industrial Engineering, Vienna University of Technology, 1060 Vienna, Austria)

Abstract

Distribution networks are typically unbalanced due to loads being unevenly distributed over the three phases and untransposed lines. Additionally, unbalance is further increased with high penetration of single-phased distributed generators. Load and optimal power flows, when applied to distribution networks, use models developed for transmission grids with limited modification. The performance of optimal power flow depends on external factors such as ambient temperature and irradiation, since they have strong influence on loads and distributed energy resources such as photo voltaic systems. To help mitigate the issues mentioned above, the authors present a novel class of optimal power flow algorithm which is applied to low-voltage distribution networks. It involves the use of a novel three-phase unbalanced holomorphic embedding load flow method in conjunction with a non-convex optimization method to obtain the optimal set-points based on a suitable objective function. This novel three-phase load flow method is benchmarked against the well-known power factory Newton-Raphson algorithm for various test networks. Mann-Whitney U test is performed for the voltage magnitude data generated by both methods and null hypothesis is accepted. A use case involving a real network in Austria and a method to generate optimal schedules for various controllable buses is provided.

Suggested Citation

  • Bharath Varsh Rao & Friederich Kupzog & Martin Kozek, 2019. "Three-Phase Unbalanced Optimal Power Flow Using Holomorphic Embedding Load Flow Method," Sustainability, MDPI, vol. 11(6), pages 1-16, March.
    • Handle: RePEc:gam:jsusta:v:11:y:2019:i:6:p:1774-:d:216787
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    Citations

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    Cited by:

    1. Bharath Varsh Rao & Mark Stefan & Roman Schwalbe & Roman Karl & Friederich Kupzog & Martin Kozek, 2021. "Stratified Control Applied to a Three-Phase Unbalanced Low Voltage Distribution Grid in a Local Peer-to-Peer Energy Community," Energies, MDPI, vol. 14(11), pages 1-19, June.
    2. Oscar Danilo Montoya & Federico Martin Serra & Cristian Hernan De Angelo & Harold R. Chamorro & Lazaro Alvarado-Barrios, 2021. "Heuristic Methodology for Planning AC Rural Medium-Voltage Distribution Grids," Energies, MDPI, vol. 14(16), pages 1-20, August.
    3. Edmunds, Calum & Galloway, Stuart & Dixon, James & Bukhsh, Waqquas & Elders, Ian, 2021. "Hosting capacity assessment of heat pumps and optimised electric vehicle charging on low voltage networks," Applied Energy, Elsevier, vol. 298(C).

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