Power Engineering Primer
Grid Inertia and Frequency Regulation Primer — When the Spinning Mass Disappears, Who Protects the Frequency?
The kinetic energy stored in a synchronous generator's rotating mass is the shock absorber that softens sudden supply-demand swings on a timescale of seconds. As inverter-connected sources — solar, wind, batteries — grow and that shock absorber shrinks, how can the grid become unstable? This article works through the swing equation, primary through tertiary regulating power, synthetic inertia, and real large-scale blackouts.