Selection of input locations for power system control

The paper discusses determination of necessary power system inputs and their location for dynamic brake control. Currently, the Bonneville POwer Administration (BPA), USA, uses power change detector relays at its Chief Joseph and John Day substations to measure a disturbance. The present work builds on the existing brake and control system structure. Using a detailed transient stability program model of the Northwest power system, 56 three-phase faults are analyzed with regard to generator voltage and accelerating power. The sensitivity of the current brake controller input sites and the need for new or additional input locations is investigated using these stability studies. Additionally, the feasibility of an analytical approach is investigated in which individual machine acceleration relative to the area center of inertia is used to determine the required number and location of measurements