Decentralized plug-and-play protection scheme for low voltage DC grids
Nils van der Blij (TU Delft - DC systems, Energy conversion & Storage)
Pavel Purgat (TU Delft - DC systems, Energy conversion & Storage)
Thiago Soeiro (TU Delft - DC systems, Energy conversion & Storage)
Laura Ramirez Elizondo (TU Delft - DC systems, Energy conversion & Storage)
MTJ Spaan (TU Delft - Algorithmics)
P Bauer (TU Delft - DC systems, Energy conversion & Storage)
More Info
expand_more
Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.
Abstract
Since the voltages and currents in dc grids do not have a natural zero-crossing, the protection of these grids is more challenging than the protection of conventional ac grids. Literature presents several unit and non-unit protection schemes that rely on communication, or knowledge about the system's topology and parameters in order to achieve selective protection in these grids. However, communication complicates fast fault detection and interruption, and a system's parameters are subject to uncertainty and change. This paper demonstrates that, in low voltage dc grids, faults propagate fast through the grid and interrupted inductive currents commutate to non-faulted sections of the grid, which both can cause circuit breakers in non-faulted sections to trip. A decentralized plug-and-play protection scheme is proposed that ensures selectivity via an augmented solid-state circuit breaker topology and by utilizing the proposed time-current characteristic. It is experimentally shown that the proposed scheme provides secure and selective fault interruption for radial and meshed low voltage dc grids under various conditions.
help_outline