Figure 6: An optimal economic behavior during the ordinary large hot water tank planning.
When these costs are optimized with a global wind and weather model, contributed by electricity forecast on energy markets, load plans for each individual facility can finally be generated for optimal economic performance in the overall portfolio. Day-ahead bids at Fjernvarme Fyn to NordPool-spot Operation and hourly load plans are generated based on day- ahead input down to 5-minute intervals. Still, they can also be executed instantly in case of breakdowns, accidents, or other changes such as unplanned maintenance. Additionally, flexi- bility bids mFRR, according to Figure 2, can easily be calculat- ed, and all costs can be included according to individual pref- erences. Optimization can occur behind the meter and with ordinary production post-meter, and, in combination with spe- cific and unique plant characteristics, any plant or facility can be considered for the OPTI platform. Precise illustration for the company and operation staff Figure 5 illustrates the ordinary portfolio planning for 14 in- dividual units. The plan is transferred daily to electricity bids cleared at the Nordpool energy market. A fast and straightfor- ward overview is the primary purpose and backbone of the platform. When a fault or outage suddenly appears - short reac- tion time is crucial. A fault or outage in the production portfolio will immediately bring production to economic risk, whether seen from a power supplier or consumer view. The financial loss from missed elec-
tricity production can be extremely high when unprepared. No human is prepared for a situation where significant faults occur, which can cause millions of $ spent wrongly due to a manual choice in a stressful situation. The OPTI platform has a fast safety mechanism that helps op- erations in case of emergency faults and outages. This is be- cause every calculation predefines the worst-case scenario at any event that can create faulty operations among entire port- folio units. If a new event or outage appears, pre-calculations from the last optimization are already done. The operator chooses to vali- date a new production strategy. After a few seconds, the OPTI platform generates a new scenario for the optimal production plan using other units and generate load plans at economic equilibrium. The production planning tool acts like insurance to support the company’s economy in an emergency by optimizing the whole portfolio, even though maintenance strategies cannot eliminate outages for large complex plants. No decisions must be made before a final economic evaluation is performed, and OPTI will help support this. “New understanding” of large hot water tanks economy Historically, large accumulation tanks have been used as stor- age or as simple buffers in case of unit or plant failures or high demand for heat. Figure 6 illustrates the optimal economic behaviour at Fjernvarme Fyn and the large storage tank. Fact box 5 explains the technical specifications for the storage tank in operation. This mindset needs to be readvised as overall and general pur- pose in the industry. New ways of optimization and better and more precise load forecasts will help generate more profit by leveraging the electricity and heat markets to your advantage. This article described how optimization tools must be used for the day-to-day planning of bidding amounts and bidding pric- es in the different electricity markets. (Link to the scientific report “The business-economic energy system modelling tool energyPRO https://www.sciencedirect. com/science/article/pii/S0360544222016954)
Fact box 5 The large storage tank at Fjernvarme Fyn
Volume: 75,000 m3 Net Volume: 66,000 m3
Net Energy Content: 4,145 MWh (92°C) Max discharge: 10,000 m3/h or 627 MJ/s Height 45 meters
OPTI performs Economic Optimization each day and helps easy planning for maintenance at other plants meanwhile demands can be supplied from large heat water tanks.
For further information please contact: Christian Ingerslev Sørensen, cis@emd.dk
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