How does energy storage contribute to frequency regulation in the grid
Frequency regulation is the process of maintaining the grid''s frequency within a narrow range, typically around 50 Hz (or 60 Hz in some countries), by balancing electricity
In the end, a control framework for large-scale battery energy storage systems jointly with thermal power units to participate in system frequency regulation is constructed, and the proposed frequency regulation strategy is studied and analyzed in the EPRI-36 node model.
Since the battery energy storage does not participate in the system frequency regulation directly, the task of frequency regulation of conventional thermal power units is aggravated, which weakens the ability of system frequency regulation.
Two forms of storage are suited for long-duration storage: green hydrogen, produced via electrolysis and thermal energy storage. Energy storage is one option to making grids more flexible. Another solution is the use of more dispatchable power plants that can change their output rapidly, for instance peaking power plants to fill in supply gaps.
The results of the study show that the proposed battery frequency regulation control strategies can quickly respond to system frequency changes at the beginning of grid system frequency fluctuations, which improves the stability of the new power system frequency including battery energy storage.
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