A 50 MW run-of-river hydroelectric station — generator protection, governor-driven frequency response, excitation and stability, and the 138kV transmission interconnection.
The project brief: the Riverbend Generating Station, a 50 MW run-of-river plant built around four 12.5 MW vertical Francis turbine-generator units, each with its own generator step-up transformer, static excitation and power system stabilizer, and digital electrohydraulic governor. Unlike this program's dispatchable generation projects, Riverbend's value to the grid comes primarily from fast, high-quality frequency response — a capability rooted directly in Module 3's treatment of grid inertia and in the physics of a rotating machine with a fast-acting hydraulic prime mover.
This module walks the whole project the way a real power system engineer would: generator protection specific to hydro units (differential, loss-of-excitation, reverse power, and why each threshold is set the way it is), governor droop and gate-rate limits and their direct role in grid frequency regulation, the static excitation system and power system stabilizer that keep the unit stable and well-damped, a fully worked step-up transformer sizing calculation with two distinct fault-current figures for two distinct purposes, and the 138kV ring-bus switchyard and interconnection study process that ties the plant into the transmission grid. The full worked numbers, complete bill of materials, and finished design reasoning are part of the unlocked module below.