The difference between energy storage station and grid connection

As the proportion of renewable energy infiltrating the power grid increases, suppressing its randomness and volatility, reducing its impact on the safe operation of the power grid, and improving the level of new energy consumption are increasingly important. For these purposes, energy storage stations (ESS) are receiving increasing attention.

It adjusts the frequency based on changes in the output active power, eliminating the need for mutual coordination among units, Tianyu Zhang et al. Simulation and application analysis of a hybrid energy storage station in a new power system 557 resulting in simple and reliable control with a fast response.

Utilizing hybrid ESSs with the two types of energy storage converters can simultaneously harness the advantages of both systems, serve the needs of a large power grid, and may be used in future substation installations.

Depending on their control modes, energy storage converters can be classified into two types: GFL and GFM. The PCS of a GFL connects to the grid and can adjust the grid frequency and voltage as required while controlling the output load.

Proceedings of the support, establish a stable voltage and frequency, and achieve self-sustained operation without relying on the grid, whereas behind-the-meter energy storage enhances grid integration and response rates. In, the ratio of GFL to GFM energy storage was established based on the constraint of the short-circuit ratio.

Energies,15 (14): 4937 Yang C, Huang L, Xin H, et al. (2021) Placing grid-forming converters to enhance small signal stability of PLL-integrated power systems.