Counts tell a strategy, and the 2020 grid-control counts tell one of fragmentation. Looking at grants and publications in the H02J 3 family — circuit arrangements for AC mains generation and distribution — the named-assignee list reads like an industrial roll call rather than a platform war.

On the incumbent side: Rolls-Royce's US10530163B2 (microgrid control), Jiangsu Goldwind's US10637242B2 (microgrid dynamic stability), and GE's US10811882B2 (solar inverter grid emulation) anchor the named grants. These are exactly the companies you would expect — turbine makers, power-conversion houses, and grid-equipment firms — each fencing off a control method adjacent to its existing hardware business.

“A micro grid power control system may control a plurality of different sources of electrical energy, such as generators, renewable energy sources, and stored energy sources. The micro grid power control system may include hierarchical levels of control.”— U.S. Patent No. 10,530,163 source

The more telling datum is the tail. A large fraction of 2020 grid-control publications carried no assignee at all — individual inventors and small entities filing method claims. US20200273120A1 (grid decision-support, machine learning) and US20200036748A1 (decentralized autonomous grid) are unassigned filings that read like academic or startup work.

What the fragmentation signals: in 2020, grid control was not yet a concentrated IP battleground. Contrast the battery landscape, where a handful of cell makers were already stacking H01M filings into defensible portfolios. Grid control was still method-rich and assignee-thin — lots of distinct ideas, little consolidation.

The caveat this desk always attaches: a snapshot of one year and one CPC family is a direction, not a verdict. Publications and grants are different populations, and an unassigned publication may later assign on grant. But the 2020 picture is consistent — grid-control IP was diffuse, which is itself a strategic fact about where the smart money was (and wasn't) building patent walls.