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Treasure island

Installation of the month – Scientists are currently carrying out research into the use of efficient storage systems on the Island of Pellworm. With the “Smart Region Pellworm” they identify how storage devices can cut costs for the grid reconstruction. 

You can see hundreds of sheep and lambs grazing on the lush green meadows and dykes on the Island of Pellworm that lies in the fascinating expanse of the North Sea. However, these animals are not just a cute attraction, they also make a significant contribution to coastal protection with their endless tramping down of the grass and act as environmentally-friendly and untiring lawn mowers.
But these living lawn mowers are not the only environmentally-friendly thing on the small 37.44 km² island, the same applies to the electricity supply for the 1100 people living there. 22.5 million kWh A kilowatt hour (kWh) is the amount of energy equivalent to powering one kilowatt (1 kW) for one hour (1 kW x 1 hour). Accordingly, there are megawatt hours (1 MWh = 1000 kWh) gigawatt hours (1 GWh = 1000 MWh = 1 million kWh) and terawatt hours (1 TWh = 109 kWh = 1 billion kWh). 1 kilowatt hour of electricity is equivalent to 17 hours of light from a 60 watt bulb. are produced on Pellworm every year from renewable energy sources. About three-times the amount needed to supply the island itself. “What is left is transmitted to the mainland behind the dyke, in part even as far as Hamburg,” explains Dieter Haack, head of the technical grid service of the Schleswig-Holstein Netz AG. “The island has over 100 feed-in systems deriving from renewable energy sources, primarily photovoltaic systems. So the energy is consumed locally on-the-spot without the usual losses,” says Haack. “Currently two thirds of the energy produced on Pellworm is transmitted over long distances to the mainland. Not only is this inefficient, it also puts an additional burden on the grid infrastructure as well. We as technical grid service wish to ensure a reliable power supply and this could be better achieved through a high level of self-consumption.”

INTELLIGENT ON-THE-SPOT ELECTRICITY SUPPLY
This is the reason the project „Smart Region Pellworm“ was launched in the year 2012. The aim is to bring together electricity generation and consumption using smart energy technology. The idea is to decrease dependency on electricity transmitted on a large-scale right across Germany and Europe and to reduce the expense of expanding the grid for electricity from renewable energies that this entails.



The large amount of electricity generated on the island thanks to the strong winds and high solar radiation could in future be held ready for local use in powerful large-scale storage systems and individual storage heaters in the houses. This buffered electricity could then be used to supply the island in times of low wind and relatively little solar radiation and make it independent of electricity from the mainland. The project is carried out by an alliance from industry and science and supported by the Federal Ministry for Environment, Nature Conservation and Nuclear Safety.

The project will determine the contribution that these energy storage systems comprising centralised and decentralised elements can make to the supply system. According to project member Matthias Glüsing from Schleswig-Holstein Netz AG, completely new avenues are being researched: “The concept of a large-scale storage facility that combines two state-of-the-art technologies – vanadium Vanadium is a chemical element with the symbol V and atomic number 23. This steel-grey, bluish shimmering transition metal is mined as ore and used mainly in steel construction. Vanadium can be recovered as a by-product of energy production from coal-fired power plants and by burning heating oil. It is non-flammable, providing high level of safety and, thanks to its full-reusability, has a high residual value. redox Red stands for reduction = gain of electrons, while Ox stands for oxidation = loss of electrons flow and lithium-ion storage systems – is indeed innovative.” GILDEMEISTER energy solutions provides the CellCube storage system (vanadium Vanadium is a chemical element with the symbol V and atomic number 23. This steel-grey, bluish shimmering transition metal is mined as ore and used mainly in steel construction. Vanadium can be recovered as a by-product of energy production from coal-fired power plants and by burning heating oil. It is non-flammable, providing high level of safety and, thanks to its full-reusability, has a high residual value. redox Red stands for reduction = gain of electrons, while Ox stands for oxidation = loss of electrons flow). Saft delivers the lithium ion battery. “We will create synergies by combining the two,” says Glüsing.

BENEFITS OF THE VANADIUM REDOX FLOW STORAGE SYSTEM CELLCUBE


A HYBRID STORAGE SYSTEM

The lithium-ion battery has an output of 1 MW and a 560 kWh A kilowatt hour (kWh) is the amount of energy equivalent to powering one kilowatt (1 kW) for one hour (1 kW x 1 hour). Accordingly, there are megawatt hours (1 MWh = 1000 kWh) gigawatt hours (1 GWh = 1000 MWh = 1 million kWh) and terawatt hours (1 TWh = 109 kWh = 1 billion kWh). 1 kilowatt hour of electricity is equivalent to 17 hours of light from a 60 watt bulb. storage capacity, while the CellCube FB 200-1600 from GILDEMEISTER energy solutions stores 1.6 MWh with an output of 200 kW Kilowatt (kW) is a unit of electrical power (energy consumption over time), 1 Kilowatt is equal to 1,000 watts. . The two technologies will undergo endurance testing with regard to duration of effect and service life as well as charging and discharging under extreme conditions.
The large amounts of electricity generated on the island under favourable weather conditions will in future be stored locally in the storage systems and the storage heating systems in the individual houses. “For the first time we will be able to test energy storage systems in regional grids and gain valuable experience in such operation for our research,” says Glüsing. “It is our aim as energy providers and grid operators to increase supply reliability and reduce peak loads in the grid. In addition it will be possible to defer the expensive expansion of the power grid that would be necessary in view of the rising demand for electricity.”
The linking of decentralised power plants with innovative storage technology and intelligent grid management systems makes Pellworm a model region for realising the energy supply. But it was not by chance that the island was chosen for the project. The findings of a feasibility study undertaken by the Westcoast University of Applied Sciences (FHW) in cooperation with Eon and the Fraunhofer Application Centre for Systems Technology proved that the island is an ideal location for the installation of a Smart Grid, due to its infrastructure and the willingness of its inhabitants to accept innovation. 

Der CellCube 200-1600 stores 1.6 MWh with an output of 200 kW Kilowatt (kW) is a unit of electrical power (energy consumption over time), 1 Kilowatt is equal to 1,000 watts. and undergoes endurance testing on the island.
As early as 1983 one of the biggest European solar parks of its time was built on the island and later in 1989 expanded to the largest hybrid power plant in Europe. The island is also one of the sunniest regions in the whole of Germany with a substantial annual yield of solar energy amounting to 1,000 kWh A kilowatt hour (kWh) is the amount of energy equivalent to powering one kilowatt (1 kW) for one hour (1 kW x 1 hour). Accordingly, there are megawatt hours (1 MWh = 1000 kWh) gigawatt hours (1 GWh = 1000 MWh = 1 million kWh) and terawatt hours (1 TWh = 109 kWh = 1 billion kWh). 1 kilowatt hour of electricity is equivalent to 17 hours of light from a 60 watt bulb. per square metre. So the whole island generates around 2.2 million kWh A kilowatt hour (kWh) is the amount of energy equivalent to powering one kilowatt (1 kW) for one hour (1 kW x 1 hour). Accordingly, there are megawatt hours (1 MWh = 1000 kWh) gigawatt hours (1 GWh = 1000 MWh = 1 million kWh) and terawatt hours (1 TWh = 109 kWh = 1 billion kWh). 1 kilowatt hour of electricity is equivalent to 17 hours of light from a 60 watt bulb. of solar energy every year, the equivalent of a saving of 22,000 litres of oil for heating. In addition Pellworm produces 4.2 million kWh A kilowatt hour (kWh) is the amount of energy equivalent to powering one kilowatt (1 kW) for one hour (1 kW x 1 hour). Accordingly, there are megawatt hours (1 MWh = 1000 kWh) gigawatt hours (1 GWh = 1000 MWh = 1 million kWh) and terawatt hours (1 TWh = 109 kWh = 1 billion kWh). 1 kilowatt hour of electricity is equivalent to 17 hours of light from a 60 watt bulb. from biomass a year and twelve wind turbines also make a valuable contribution to the CO2-free production of energy.

However, the willingness of the inhabitants to accept innovation is also of particular importance, stresses Haack. “90 % of the people on the island are open for renewable energies and the expansion of the power grid. From the very outset we involved the inhabitants with information evenings and discussion rounds. The people on Pellworm want there their home to become a green island and wish to play their part in spreading the idea of intelligent grids and the local storage of electricity generated from renewable sources throughout the world.” 

Please check http://www.smartregion-pellworm.de for more information on the island of Pellworm.

Published on 8 August the 2013 in photovoltaik

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