Advanced Safety Filter for Smooth Transient Operation of a Battery Energy Storage System
<|reference_start|>Advanced Safety Filter for Smooth Transient Operation of a Battery Energy Storage System: In this paper, we implement an advanced safety filter to smoothly limit the current of an inverter-based Battery Energy Storage System. The task involves finding suitable Control Barrier Function and Control Lyapunov Function via Sum-of-Squares optimization to certify the system's safety during grid transients. In contrast to the conventional safety filter, the advanced safety filter not only provides a safety certificate but also achieves finite-time convergence to a nominal region. Within this region, the action of the nominal control, i.e. the Enhanced Direct Power Control, remains unaltered by the safety filter. The advanced safety filter is implemented using a Quadratically Constrained Quadratic Program, providing the capability to also encode quadratic input constraints. Finally, we showcase the effectiveness of the implementation through simulations involving a load step at the Point of Common Coupling, and we compare the outcomes with those obtained using a standard vector current controller.<|reference_end|>
@article{schneeberger2024advanced,
    title={Advanced Safety Filter for Smooth Transient Operation of a Battery
  Energy Storage System},
    author={Michael Schneeberger, Florian D"orfler, Silvia Mastellone},
    journal={arXiv preprint arXiv:2405.14427},
    year={2024},
    archivePrefix={arXiv},
    eprint={2405.14427},
    primaryClass={eess.SY cs.SY}
}