Grid inertia, frequency and voltage regulation, load flow, fault current and short circuit ratio, synchronization, black start, N-1 reliability, and substation protection — the hallmark concept set every later module in this program builds on.
This is the module that separates a utility-scale power systems engineer from an electrical engineer who's only worked at building scale. The physics is the same, but the questions are different: how much kinetic energy is actually holding grid frequency together right now, why a weak interconnection point can destabilize an otherwise well-designed wind farm, why a bus fault has to clear in three cycles instead of thirty, and what it actually takes to restart a grid from zero.
Twenty concepts, grouped into eleven working pairs and trios, each explained with the concrete failure mode or design decision that makes the distinction matter — not definitions to memorize, but the reasoning every later module (Transmission, Substations, Protection Coordination, Renewable Integration, and all five real-project case studies) assumes you already carry with you.