Efficient Control of Active Transformers for Increasing the PV Hosting Capacity of LV Grids

Seyedmostafa Hashemi Toghroljerdi; Jacob Østergaard; Thomas Degner; Ron Brandl; Wolfram Heckmann

doi:10.1109/TII.2016.2619065

Efficient Control of Active Transformers for Increasing the PV Hosting Capacity of LV Grids

Seyedmostafa Hashemi Toghroljerdi, Jacob Østergaard, Thomas Degner, Ron Brandl, Wolfram Heckmann

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Abstract

The increased penetration of grid-connected photovoltaic (PV) systems in low voltage (LV) grids creates concerns about overvoltage in these grids. The proposed methods to prevent overvoltage, such as reactive power absorption by PV inverters and active power management of customers, focus on decreasing the voltage rise along LV feeders, and the potential of active medium voltage to low voltage (MV/LV) transformers for overvoltage prevention has not been thoroughly investigated. This paper presents the application of active MV/LV transformers for increasing the PV hosting capacity of LV grids. The potential interferences between the operation of active transformers and the reactive power absorption by PV inverters are investigated, and a voltage droop control approach is proposed for the efficient control of these transformers during high PV generation periods. The proposed method can potentially increase the PV hosting capacity of the grid, while eliminating the need for a complex and centralized controller. The voltages of specific locations or the grid state estimations provide adequate data for adjustments of the droop parameters. The simulations and field test results associated with the implementation of the proposed method to a newly developed active LV grid with high PV penetration in Felsberg, Germany, confirm the efficiency of the proposed method.

Original language	English
Journal	IEEE Transactions on Industrial Informatics
Volume	13
Issue number	1
Pages (from-to)	270 - 277
ISSN	1551-3203
DOIs	https://doi.org/10.1109/TII.2016.2619065
Publication status	Published - 2016

Bibliographical note

(c) 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works

Keywords

Low Voltage Grid
Active transformer
High PV penetration
Voltage control
Reactive power management

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1109/TII.2016.2619065

Active transformerAccepted author manuscript, 2.12 MB

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ELN: EnergyLab Nordhavn - New Urban Energy Infrastructures
Greisen, C., Toghroljerdi, S. H., Østergaard, J., Træholt, C., Pinson, P., Mitridati, L., Klyapovskiy, S., Le Ray, G. J. R., Gjelaj, M., You, S., Harrestrup, M., Rode, C., Elmegaard, B., Ommen, T. S., Foteinaki, K., Luc, K. M., Pieper, H., Meesenburg, W., Mitridati, L. & Le Ray, G. J. R.
01/04/2015 → 31/03/2019
Project: Research

Cite this

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abstract = "The increased penetration of grid-connected photovoltaic (PV) systems in low voltage (LV) grids creates concerns about overvoltage in these grids. The proposed methods to prevent overvoltage, such as reactive power absorption by PV inverters and active power management of customers, focus on decreasing the voltage rise along LV feeders, and the potential of active medium voltage to low voltage (MV/LV) transformers for overvoltage prevention has not been thoroughly investigated. This paper presents the application of active MV/LV transformers for increasing the PV hosting capacity of LV grids. The potential interferences between the operation of active transformers and the reactive power absorption by PV inverters are investigated, and a voltage droop control approach is proposed for the efficient control of these transformers during high PV generation periods. The proposed method can potentially increase the PV hosting capacity of the grid, while eliminating the need for a complex and centralized controller. The voltages of specific locations or the grid state estimations provide adequate data for adjustments of the droop parameters. The simulations and field test results associated with the implementation of the proposed method to a newly developed active LV grid with high PV penetration in Felsberg, Germany, confirm the efficiency of the proposed method.",

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Efficient Control of Active Transformers for Increasing the PV Hosting Capacity of LV Grids

Abstract

Bibliographical note

Keywords

UN SDGs

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Projects

ELN: EnergyLab Nordhavn - New Urban Energy Infrastructures

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