Abstract

This paper addresses the impacts introduced on Distribution Transformer (DT) aging due to the integration of nearly Zero-Energy Buildings (nZEBs) into existing Low-Voltage Distribution Grids. The study considers a neighborhood in the Portuguese municipality of Évora where buildings are set to become nZEBs using solar Photovoltaic systems. This transition is reproduced by simulation using real pre-transition electricity demand and climate data. Following the IEC 60076-7 standard to model the aging process of the considered DT, the collected results show that nZEBs can have a positive impact on the analyzed aging process. However, when relatively high nZEB integration levels are considered, this study also reveals that the subsequent reverse power flows can achieve relatively large magnitudes, especially around noon, thus accelerating the DT's aging into prohibitive values. Given the utmost importance of the nZEB concept for the European building stock, this study identifies nZEBs operation related issues that can result from excessive coincident on-site generation and presents a battery based power export limitation strategy to mitigate such impacts on DT aging.

LanguageEnglish
Pages669-678
Number of pages10
JournalEnergy
Volume157
DOIs
Publication statusPublished - 15 Aug 2018

Fingerprint

Aging of materials
Solar buildings
Electricity
Electric potential

Keywords

  • Distribution transformers aging
  • Grid interaction
  • Low-voltage distribution grids
  • Nearly Zero-Energy Buildings
  • Photovoltaic systems

Cite this

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title = "A case study on the impact of nearly Zero-Energy Buildings on distribution transformer aging",
abstract = "This paper addresses the impacts introduced on Distribution Transformer (DT) aging due to the integration of nearly Zero-Energy Buildings (nZEBs) into existing Low-Voltage Distribution Grids. The study considers a neighborhood in the Portuguese municipality of {\'E}vora where buildings are set to become nZEBs using solar Photovoltaic systems. This transition is reproduced by simulation using real pre-transition electricity demand and climate data. Following the IEC 60076-7 standard to model the aging process of the considered DT, the collected results show that nZEBs can have a positive impact on the analyzed aging process. However, when relatively high nZEB integration levels are considered, this study also reveals that the subsequent reverse power flows can achieve relatively large magnitudes, especially around noon, thus accelerating the DT's aging into prohibitive values. Given the utmost importance of the nZEB concept for the European building stock, this study identifies nZEBs operation related issues that can result from excessive coincident on-site generation and presents a battery based power export limitation strategy to mitigate such impacts on DT aging.",
keywords = "Distribution transformers aging, Grid interaction, Low-voltage distribution grids, Nearly Zero-Energy Buildings, Photovoltaic systems",
author = "Lopes, {Rui Amaral} and Pedro Magalh{\~a}es and Gouveia, {Jo{\~a}o Pedro} and Daniel Aelenei and Celson Lima and Jo{\~a}o Martins",
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A case study on the impact of nearly Zero-Energy Buildings on distribution transformer aging. / Lopes, Rui Amaral; Magalhães, Pedro; Gouveia, João Pedro; Aelenei, Daniel; Lima, Celson; Martins, João.

In: Energy, Vol. 157, 15.08.2018, p. 669-678.

Research output: Contribution to journalArticle

TY - JOUR

T1 - A case study on the impact of nearly Zero-Energy Buildings on distribution transformer aging

AU - Lopes, Rui Amaral

AU - Magalhães, Pedro

AU - Gouveia, João Pedro

AU - Aelenei, Daniel

AU - Lima, Celson

AU - Martins, João

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PY - 2018/8/15

Y1 - 2018/8/15

N2 - This paper addresses the impacts introduced on Distribution Transformer (DT) aging due to the integration of nearly Zero-Energy Buildings (nZEBs) into existing Low-Voltage Distribution Grids. The study considers a neighborhood in the Portuguese municipality of Évora where buildings are set to become nZEBs using solar Photovoltaic systems. This transition is reproduced by simulation using real pre-transition electricity demand and climate data. Following the IEC 60076-7 standard to model the aging process of the considered DT, the collected results show that nZEBs can have a positive impact on the analyzed aging process. However, when relatively high nZEB integration levels are considered, this study also reveals that the subsequent reverse power flows can achieve relatively large magnitudes, especially around noon, thus accelerating the DT's aging into prohibitive values. Given the utmost importance of the nZEB concept for the European building stock, this study identifies nZEBs operation related issues that can result from excessive coincident on-site generation and presents a battery based power export limitation strategy to mitigate such impacts on DT aging.

AB - This paper addresses the impacts introduced on Distribution Transformer (DT) aging due to the integration of nearly Zero-Energy Buildings (nZEBs) into existing Low-Voltage Distribution Grids. The study considers a neighborhood in the Portuguese municipality of Évora where buildings are set to become nZEBs using solar Photovoltaic systems. This transition is reproduced by simulation using real pre-transition electricity demand and climate data. Following the IEC 60076-7 standard to model the aging process of the considered DT, the collected results show that nZEBs can have a positive impact on the analyzed aging process. However, when relatively high nZEB integration levels are considered, this study also reveals that the subsequent reverse power flows can achieve relatively large magnitudes, especially around noon, thus accelerating the DT's aging into prohibitive values. Given the utmost importance of the nZEB concept for the European building stock, this study identifies nZEBs operation related issues that can result from excessive coincident on-site generation and presents a battery based power export limitation strategy to mitigate such impacts on DT aging.

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