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Optimising regimes for energy storage in a power system

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The situation when the total rated power and energy capacity of the energy storage are used in a compulsory regime is quite rare, since the storage unit parameters have been chosen under 'cover the winter peak demand and summer trough demand' conditions. It may be considered as an unplanned regime when all the reserve capacity is already used and there is still a shortage of generating power. An optimal regime arises when part of the rated power and energy capacity of the storage is not used for compulsory load coverage. Usage of the rest of installed capacity of the energy storage unit allows us to change the load on generating units in an optimal way, making it possible to minimise the fuel cost for the energy consumed. Unused or spare energy storage capacity may also be used as spinning reserve. Use of the reserve regime provides fuel saving whenever there is a need for spinning reserve.

Chapter Contents:

• 16.1 Storage regimes in the power system
• 16.2 The optimal regime criterion
• 16.3 Criterion for a simplified one-node system
• 16.4 Algorithm for the optimal regime

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