Energy storage unit soc imbalance

What is a control strategy for energy storage?

Compared with the traditional control strategy, the proposed control strategy can effectively balance the SOH and SOC of each energy storage unit and keeps the system's overall capacity for a longer period.

Does SoC equalization affect energy storage capacity?

At present, most of the studies on SOC equalization are aimed at the DESUs with the same capacity. With frequent charging, discharging, and aging, the capacity of each energy storage unit will vary. However, the problems of SOC equalization and current distribution for DESUs with different capacities are rarely studied.

How does state-of-charge equalization improve the Droop coefficient of distributed energy storage units?

With the improved state-of-charge equalizer, the droop coefficient of distributed energy storage units adaptively changes according to their state-of-charge value to achieve state-of-charge equalization between distributed energy storage units of different capacities.

What happens if energy storage system is operated according to equal sharing?

If the system is operated according to the traditional equal sharing control strategy, the simulation results are shown in Fig. 7 d, where the energy storage system has storage units whose health state drops to 80% after 3556 h of operation, which in turn reduces the capacity of the whole system.

What if energy storage units have a large S O C I?

For energy storage units with larger S O C i — i.e., when the disparity between S O C i and the S O C a v g is substantial — it becomes necessary to impose a state in which the R i remains low for extended periods. This can be achieved by adopting a suitably larger value for n.

What is soh equalisation in energy storage systems?

SOH equalisation for energy storage systems is also a popular research point at present, the control of SOH equalisation in energy storage systems is mainly divided into SOH equalisation between individual batteries and SOH equalisation between energy storage units .