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

Research output: Contribution to journalJournal articleResearchpeer-review

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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 languageEnglish
JournalI E E E Transactions on Industrial Informatics
Volume13
Issue number1
Pages (from-to)270 - 277
ISSN1551-3203
DOIs
Publication statusPublished - 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

Cite this

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title = "Efficient Control of Active Transformers for Increasing the PV Hosting Capacity of LV Grids",
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.",
keywords = "Low Voltage Grid, Active transformer, High PV penetration, Voltage control, Reactive power management",
author = "{Hashemi Toghroljerdi}, Seyedmostafa and Jacob {\O}stergaard and Thomas Degner and Ron Brandl and Wolfram Heckmann",
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",
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Efficient Control of Active Transformers for Increasing the PV Hosting Capacity of LV Grids. / Hashemi Toghroljerdi, Seyedmostafa; Østergaard, Jacob; Degner, Thomas; Brandl, Ron; Heckmann, Wolfram.

In: I E E E Transactions on Industrial Informatics, Vol. 13, No. 1, 2016, p. 270 - 277.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Efficient Control of Active Transformers for Increasing the PV Hosting Capacity of LV Grids

AU - Hashemi Toghroljerdi, Seyedmostafa

AU - Østergaard, Jacob

AU - Degner, Thomas

AU - Brandl, Ron

AU - Heckmann, Wolfram

N1 - (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

PY - 2016

Y1 - 2016

N2 - 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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