DC link operation in smart distribution systems with communication interruptions

摘要

DC Links are proposed in the literature as a mean to enhance the system performance and facilitate the integration of dispersed generators in distribution grids. Their operation relies on a centralized controller which gathers the measurements acquired along the network to compute their adequate set points. This system architecture provides several technical benefits but strongly depends on communication infrastructures (meters, data concentrators, etc.) which may fail. When this happens the DC links may not work properly, even forcing the system operator to disconnect them until the communications are restored. This paper proposes operational strategies to avoid the malfunction or disconnection of DC links when communication interruptions occur. Several simulations are done to assess how these strategies affect the performance of the DC links. An actual Spanish 100-bus distribution system with a DC link is used as a test bench in different situations.