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Energilager och nätförluster - Fallstudie Öland

Fetahi, Agron LU (2015) In CODEN:LUTEDX/TEIE EIE920 20151
Industrial Electrical Engineering and Automation
Abstract
The development of the renewable energy sources and the amount installations in Sweden and also in other countries have increased a lot the last years, this is especially true for solar- and wind power. Main reason for the increase of the renewable energy sources is to decrease the usage of fossil fuels and thus to decrease the impact on the climate.
The integration of the renewable energy sources have meant a change for the electric grid. This is because the electric grid are suited to a predictable energy production often made of fossil fuels, waterpower and/or nuclear power. Renewable energy sources is however intermittent, which can cause problems for electricity grid. For a network to function, it is essential that electricity... (More)
The development of the renewable energy sources and the amount installations in Sweden and also in other countries have increased a lot the last years, this is especially true for solar- and wind power. Main reason for the increase of the renewable energy sources is to decrease the usage of fossil fuels and thus to decrease the impact on the climate.
The integration of the renewable energy sources have meant a change for the electric grid. This is because the electric grid are suited to a predictable energy production often made of fossil fuels, waterpower and/or nuclear power. Renewable energy sources is however intermittent, which can cause problems for electricity grid. For a network to function, it is essential that electricity production and consumption are in balance. Other problems that renewable energy can cause is that the grid can be overloaded, high losses of transmission lines etc. The conventional method for solving problems related to renewable energy sources for the grid operators is to make power line upgrades but this is usually very expensive and many times other options are evaluated. An interesting theme nowadays is energy storage connected to the power grid, this is considered to be the next step in development to manage the various problems that renewable energy can cause the electricity grid.
The purpose with the thesis is to examine how much the losses in a 50 kV grid can be reduced with energy storage. It also includes using simulations to determine how large the energy storage needs to be. Further, electrochemical energy storage is evaluated and it is examined whether it is possible to avoid or postpone investments in the grid of the case study, which is the power grid of Öland.
The method in the work consists of a literature study regarding energy storage and a case study about the electricity grid of Öland. The simulation program Power System simulator for engineering (PSS/E) has been used and it has been done simulations with and without energy storage for e.g. to observe how much the losses can be reduced in the power lines. A simple model for the energy storage has been used, and historical hourly data for both active and reactive power is used in the simulations.
The results obtained show that it is possible to reduce the losses with an energy storage, but to make significant reductions a large energy storage is needed, for example with a power rating up to 10 MW and energy rating between 50 and 450 MWh. With today’s prices, this is not a reasonable investment. A recommendation to E.ON grid is that they continue to operate the grid as they to today, however, one must not forget the power line losses which costs approximately 2.5 million SEK each year. (Less)
Popular Abstract (Swedish)
Expansion och integration av vindkraft i distributionsnäten medför ökad risk för överbelastning av ledningar och nätförluster. För att möjliggöra hög andel vindkraft installerat i distributionsnätet så har E.ON installerat ett Dynamic Line Rating- system på Öland för att övervaka ledningarna och ett styrsystem som kan styra ner elproduktionen från vindkraft då risk för överbelastning förekommer. Att på detta vis utnyttja nätets fulla kapacitet är kopplat till högre effektförluster och större energilager, vilket utvärderas som ett alternativ till nätuppgraderingar för att reducera dessa förluster. Resultaten visar att det går att reducera förlusterna i elnätet. Detta sker dock till priset av att det behövs hög kapacitet på effekt och energi... (More)
Expansion och integration av vindkraft i distributionsnäten medför ökad risk för överbelastning av ledningar och nätförluster. För att möjliggöra hög andel vindkraft installerat i distributionsnätet så har E.ON installerat ett Dynamic Line Rating- system på Öland för att övervaka ledningarna och ett styrsystem som kan styra ner elproduktionen från vindkraft då risk för överbelastning förekommer. Att på detta vis utnyttja nätets fulla kapacitet är kopplat till högre effektförluster och större energilager, vilket utvärderas som ett alternativ till nätuppgraderingar för att reducera dessa förluster. Resultaten visar att det går att reducera förlusterna i elnätet. Detta sker dock till priset av att det behövs hög kapacitet på effekt och energi för ett energilager, vilket är kopplat med höga investeringskostnader. (Less)
Please use this url to cite or link to this publication:
author
Fetahi, Agron LU
supervisor
organization
alternative title
Energy storage and grid losses - Case study Öland
course
EIE920 20151
year
type
H3 - Professional qualifications (4 Years - )
subject
keywords
energy storage sizing, grid losses, energy storage, electrochemical storage
publication/series
CODEN:LUTEDX/TEIE
report number
5358
language
Swedish
id
8160891
date added to LUP
2015-11-26 12:12:02
date last changed
2015-11-26 12:12:02
@misc{8160891,
  abstract     = {The development of the renewable energy sources and the amount installations in Sweden and also in other countries have increased a lot the last years, this is especially true for solar- and wind power. Main reason for the increase of the renewable energy sources is to decrease the usage of fossil fuels and thus to decrease the impact on the climate.
The integration of the renewable energy sources have meant a change for the electric grid. This is because the electric grid are suited to a predictable energy production often made of fossil fuels, waterpower and/or nuclear power. Renewable energy sources is however intermittent, which can cause problems for electricity grid. For a network to function, it is essential that electricity production and consumption are in balance. Other problems that renewable energy can cause is that the grid can be overloaded, high losses of transmission lines etc. The conventional method for solving problems related to renewable energy sources for the grid operators is to make power line upgrades but this is usually very expensive and many times other options are evaluated. An interesting theme nowadays is energy storage connected to the power grid, this is considered to be the next step in development to manage the various problems that renewable energy can cause the electricity grid.
The purpose with the thesis is to examine how much the losses in a 50 kV grid can be reduced with energy storage. It also includes using simulations to determine how large the energy storage needs to be. Further, electrochemical energy storage is evaluated and it is examined whether it is possible to avoid or postpone investments in the grid of the case study, which is the power grid of Öland.
The method in the work consists of a literature study regarding energy storage and a case study about the electricity grid of Öland. The simulation program Power System simulator for engineering (PSS/E) has been used and it has been done simulations with and without energy storage for e.g. to observe how much the losses can be reduced in the power lines. A simple model for the energy storage has been used, and historical hourly data for both active and reactive power is used in the simulations.
The results obtained show that it is possible to reduce the losses with an energy storage, but to make significant reductions a large energy storage is needed, for example with a power rating up to 10 MW and energy rating between 50 and 450 MWh. With today’s prices, this is not a reasonable investment. A recommendation to E.ON grid is that they continue to operate the grid as they to today, however, one must not forget the power line losses which costs approximately 2.5 million SEK each year.},
  author       = {Fetahi, Agron},
  keyword      = {energy storage sizing,grid losses,energy storage,electrochemical storage},
  language     = {swe},
  note         = {Student Paper},
  series       = {CODEN:LUTEDX/TEIE},
  title        = {Energilager och nätförluster - Fallstudie Öland},
  year         = {2015},
}