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Accurate Assessment of Decoupled OLTC Transformers to Optimize the Operation of Low-Voltage Networks

Author

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  • Álvaro Rodríguez del Nozal

    (Departamento de Ingeniería, Universidad Loyola Andalucía, 41014 Seville, Spain)

  • Esther Romero-Ramos

    (Department of Electrical Engineering, Universidad de Sevilla, 41092 Sevilla, Spain)

  • Ángel Luis Trigo-García

    (Department of Electrical Engineering, Universidad de Sevilla, 41092 Sevilla, Spain)

Abstract

Voltage control in active distribution networks must adapt to the unbalanced nature of most of these systems, and this requirement becomes even more apparent at low voltage levels. The use of transformers with on-load tap changers is gaining popularity, and those that allow different tap positions for each of the three phases of the transformer are the most promising. This work tackles the exact approach to the voltage optimization problem of active low-voltage networks when transformers with on-load tap changers are available. A very rigorous approach to the electrical model of all the involved components is used, and common approaches proposed in the literature are avoided. The main aim of the paper is twofold: to demonstrate the importance of being very rigorous in the electrical modeling of all the components to operate in a secure and effective way and to show the greater effectiveness of the decoupled on-load tap changer over the usual on-load tap changer in the voltage regulation problem. A low-voltage benchmark network under different load and distributed generation scenarios is tested with the proposed exact optimal solution to demonstrate its feasibility.

Suggested Citation

  • Álvaro Rodríguez del Nozal & Esther Romero-Ramos & Ángel Luis Trigo-García, 2019. "Accurate Assessment of Decoupled OLTC Transformers to Optimize the Operation of Low-Voltage Networks," Energies, MDPI, vol. 12(11), pages 1-22, June.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:11:p:2173-:d:237881
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    References listed on IDEAS

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    1. Bayer, Benjamin & Matschoss, Patrick & Thomas, Heiko & Marian, Adela, 2018. "The German experience with integrating photovoltaic systems into the low-voltage grids," Renewable Energy, Elsevier, vol. 119(C), pages 129-141.
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