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The power grid can be pictured as a water supply system: pipes are the lines, and pumps are the converters. When pressure (voltage) drops in some district, powerful pumps can send extra water (power) there. The trouble is, too strong a flow causes overload, and too weak a flow doesn't help. You need to know exactly how far to open the valve.

Engineers found the answer. They came up with a formula that, akin to the standard model, predicts the ideal setting from minimal data: just measure local parameters and roughly estimate the difference in "water columns" between the line ends. No complex real-time calculations — the simple equation gives the one correct value.

Tests on a prototype network confirmed: even if the level difference is known imprecisely, the method remains reliable. This makes it ideal for emergency controllers that must act in a split second.