Adaptive Information Flow Mechanisms and Management for Power Grid Contingencies
GridStat is a QoS-managed publish-subscribe framework for data delivery for the electric power grid. GridStat’s Data Plane delivers data updates through a network of middleware-level Status Routers. Subscriptions are managed by GridStat’s hierarchical QoS Management Plane. The path allocation computations are typically done offline and beforehand, but are complex, not only due to the multiple QoS constraints but the number of status routers that would be involved an entire power grid. In a crisis, many entities may suddenly wish to add a large number of subscription requests, which would in practice overwhelm the subscription allocation mechanisms. In this paper we present a mechanism called modes, which lets GridStat change routing tables quickly. Modes can be either global, or only active at a given scope within the hierarchy. We present the design and experimental evaluation of GridStat modes and of two different mode change algorithms that provide different tradeoffs of performance and consistency.
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