Start with the function, not the company. US10530163B2, granted to Rolls-Royce Corporation on January 7, 2020, describes a microgrid control system that has to do the unglamorous but load-bearing job of any microgrid: decide moment to moment how much power comes from generation versus storage, and manage the handoff when the microgrid disconnects from — and later reconnects to — the larger grid.
The CPC tags tell you where the engineering lives. H02J 3/46 is control of power between generators; H02J 4/00 covers AC-distribution-side systems; H02J 9/061 is emergency/standby supply with automatic switchover. That last tag is the tell: this is a patent about graceful transition, not steady-state operation. The hard part of a microgrid is never running normally; it is the seam between connected and islanded.
That seam is precisely the deployment bottleneck. When a behind-the-meter microgrid disconnects during a grid fault, it must hold its own frequency and voltage; when the grid returns, it must resynchronize without a damaging transient. Utilities will not approve interconnection unless the controller proves it can do both. The IP here is a claim on how to orchestrate that transition across heterogeneous assets.
What the patent does not do is ship a grid. A control-system claim is a recipe for coordination; the inverters, breakers, and storage that execute it are someone else's hardware. Reading this as "Rolls-Royce owns microgrid control" would be the exact category error this desk exists to flag — it owns one orchestration method, in one family.
Still, the mapping from patent to grid is clean. The resynchronization and islanding logic described in 2020 is the same logic that determines whether a 2026 microgrid project clears its interconnection study. The patent is a five-year-old artifact of a problem that has only become more binding as more distributed generation comes online.