For more than 100 years, conventional fossil-fueled power plants have supplied society with electricity. Although Denmark has already succeeded in integrating a high share of renewables into the power grid, many conventional units are still in use. The need for security of supply and power system st Contact online >>
For more than 100 years, conventional fossil-fueled power plants have supplied society with electricity. Although Denmark has already succeeded in integrating a high share of renewables into the power grid, many conventional units are still in use. The need for security of supply and power system stability maintains operation of these power plants.
"Battery energy storage systems have great potential to take over the services that are currently provided by conventional plants, "says Dr. Seyedmostafa Hashemi Toghroljerdi, DTU Electrical Engineering.
Dr Hashemi Toghroljerdi is the project manager of a new DTU led project called BOSS (BOrnholm Smartgrid Secured –by grid connected battery systems), which Danish Energy Technology Development and Demonstration Program (EUDP) has just granted 19 million DKK. The total budget is 30 million DKK.
The next four years, BOSS project will develop and demonstrate an advanced battery energy storage system with a total capacity of 1MWh/1MW. This will be the largest grid connected battery installed in Denmark to date.
Recently, International Energy Agency (IEA) estimated in an analysis that battery storage will become the most competitive option for flexibility in the future power system - due to cost reduction on batteries. The academic, utility and industrial partners in the BOSS Project share this view.
"Our aim is to develop and demonstrate the build and operation of an innovative battery energy storage system - the key to future smart grids. The experience gained will secure Denmark in the vanguard of sustainable energy technologies," says Chair of Steering Committee for the BOSS Project, Associate Professor Chresten Træholt, DTU Electrical Engineering.
The Danish island of Bornholm was chosen as the test site because it represents a scaled model of the Danish renewable integrated power system and it has the ability to operate in grid-connected and island mode.
"Examining the grid stability with and without battery energy storage systems in both grid-connected and island modes is unique, and makes BOSS Project among very few projects in the world exploring the stability of a smart grid with high share of renewables combined with battery systems," says Dr. Hashemi Toghroljerdi.
Successful demonstration of BOSS Project''s battery energy storage system should provide a unique road map and opportunity for Denmark and other countries that follow fossil-fuel-free policy, he explains.
Hyme Energy and Bornholms Energi & Forsyning are building a pilot project to store clean electricity with molten salt. The system will likely start providing heat, power and ancillary services by 2024.
Hyme Energy ApS, a unit of Denmark''s Seaborg Technologies, is partnering with Bornholms Energi & Forsyning (BEOF) to build its first molten salt thermal energy storage demonstrator on the Danish island of Bornholm.
“The plant is to be built in the Baltic Sea on Bornholm, close to all the planned wind turbine parks,” a company spokesperson told pv magazine. “The facility, however, will not be connected directly to a renewable energy source, it will be connected to the normal electric grid. We will store cheap ‘excess'' electricity and that will mostly be from renewable sources – and as our national grid is going towards 100 % renewables, our plant will be powered more and more by renewables.”
The company''s storage technology uses renewable energy to heat the salt using electrical heaters. It is based on two-tank molten salt storage designs developed for concentrated solar power (CSP) plants. It said it has a scalable storage capacity from 250 MWh to 5 GWh. A 1 GWh facility with sodium hydroxides should be able to store heat to produce power and heat for around 100,000 households for 10 hours of discharge.
The two tanks are able to store electricity as heat at 700 C. The high temperature provides large flexibility for how energy can be extracted back out, including Rankine cycle combined heat-and-power production, Brayton cycle heat-to-power, heat storage for district heating, and industrial process heat. The technology also uses immersion heaters to store excess electricity as heat, while pumps control the flow for discharging through salt to steam heat exchangers for producing steam to drive steam turbines for co-generation in the simplest setup.
Seaborg Technologies, which makes molten salt nuclear reactors, said the storage system could have a maximum heat loss of 0.5% to 1% per day. Costs should be between 30% and 50% lower than conventional molten salt storage. Hyme said it believes it could halve the price of long-term and large-scale energy storage facilities, regardless of geographical location.
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