The difference between a microgrid that works on paper and one that clears an interconnection study is often the sophistication of its controller. US11398727B2, granted to Hitachi Energy Switzerland on July 26, 2022, claims a microgrid control method, and the giveaway is in the classification.
Most microgrid control patents sit purely in H02J 3 (power distribution arrangements). This one adds G05B 13/048 — adaptive and predictive control systems. That single tag changes the character of the claim: it is not just balancing power in the moment, it is anticipating and optimizing dispatch ahead of time.
The grid mapping is direct. A microgrid juggling solar, storage, and load benefits enormously from looking ahead — charging the battery before a forecast cloud, holding reserve before a predicted peak, scheduling generation to minimize cost or emissions. Model-predictive control is how you turn a reactive microgrid into an optimizing one, and the H02J 2300/24 and 2300/28 tags (storage/generation optimization) confirm that intent.
What the patent fences off is a control method, not the microgrid hardware and not predictive control in general. Model-predictive control is a broad academic field; the patent claims a specific application of it to coordinated microgrid dispatch. The scope is the method, in this context.
From patent to grid, this is a marker of the field maturing. The 2020 microgrid patents (Rolls-Royce, Goldwind) were about stability and islanding — keeping the lights on. By 2022, Hitachi is claiming optimization on top of stability. The IP trail tracks the deployment reality: first make microgrids reliable, then make them smart.