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arXiv · 2405.14427

Advanced Safety Filter for Smooth Transient Operation of a Battery Energy Storage System

Michael Schneeberger·Florian Dörfler·Silvia Mastellone
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Abstract

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.

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Michael Schneeberger, Florian Dörfler, Silvia Mastellone. 2024-05-23. Advanced Safety Filter for Smooth Transient Operation of a Battery Energy Storage System. https://arxiv.org/abs/2405.14427

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