Figure 2: Monthly duration curve for mFRR in DK1 West from dec-21 to dec-22.
the possibility to spread the production into several plant units (heat and power) and by then ensure that production always is produced on the plant with the lowest marginal costs accord- ing to various input parameters, such as market fuel prices, tax, CO2, power prices, etc. It is a unique technique to ensure the right economy 24/7 and to ensure the benefit of optimal production plans from the OPTI platform. Fact box 1 shows a countermove to a volatile power market due to the large renewable energy buildout. This ensures the lowest possible production price to benefit the customer. This is a unique size and portfolio complexity in Denmark since Fjernvarme Fyn produces electricity and heat using various renewable energy technologies. For example, Unit 4 utilizes 165,000 MWh of excess heat from the META data centre server halls, using heat pumps driven by 100% renewable energy to lift the temperature, and then distributed to 7,000 households in collaboration with Fjernvarme Fyn. The fuel portfolio furthermore includes waste, straw, wood- chips, oil, coal, gas, sewage heat pumps, electric boilers, seawa- ter heat pumps, and motor engine heat from several backup units. Heat accumulation through a central 3,000 MWh heat storage tank helps achieve an economic optimum “24/7”.
The diverse portfolio creates a unique interaction with the electricity market, where live bidding on the Nordic electricity exchange stock “Nordpool” is processed within 5 seconds every time a new bid is placed. Figure 3 illustrates the supply area for heat distribution and the main heat supply plants in the port- folio. Fact box 1 shows each plant’s specs, and fact boxes 2 and 3 show yearly production in heat and electricity. The digital twin of Fjernvarme Fyn The starting point of optimal production planning is the plant’s digital twin as an energy model that transforms the physical parameters into simple mathematical calculations. EMD In- ternational A/S delivers energyPRO, and in combination with the OPTI platform, it is possible to transform any energyPRO model into the platform. This process generates a digital twin, and the platform can be launched. The digital twin forms the basis for the model used to trade in the electricity market. It is a simple and flexible system that provides excellent opportu- nities to continuously adjust the model as the energy markets or the portfolio expands. OPTI Platform – a simple production planning tool Figure 4 shows the tool’s user interface that Fjernvarme Fyn uses for optimal production planning. This software platform integrates computational technology with limitless capabili- ties through cloud technology, where calculations are made in a few seconds with high capacity. Featuring a user-friendly interface, the platform is a pioneer in Denmark, transforming the green future for several companies. The platform calculates all input parameters at a speed of 10
Fact box 1 - Plant overview
Unit Fuel
Output Note 1 Waste incineration 23 MWe + 116 MJ/s Bypass / CHP 2 Woodchip
40 MWe + 150 MJ/s Bypass / Back Pressure
Fact box 4 OPTI platform
3 Electric boiler
100 MW
by Energinet TSO
4 META Heat Central 40 MJ/s
Closed optimazation loop
1. User-friendly 2. Quick Economic overview 3. Premodus default modes 4. Fast learning curve 5. Fast Cloud Solver World Wide 6. Direct access to energy stock 7. Easy synchronisation to BRP 8. Virtual hard ware - setup
5 Sludge Heat Pump 5 MWe + 20 MJ/s 6 Cordless tank
65,000 M3 + 3,000 MWh
7 Coal
350 MWe + 480 MW Back Pressure
8 Straw
30 MWe + 110 MJ/s Bypass / Back Pressure
9 Gas Engine
4.1 MWe
10 Gas Engine
2.4 MWe
11 Electricity
1 MWe + 1 MJ/s
12 Oil
500 MJ/s + 200 MJ/s (gas)
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