Power management system (PMS)

A power management system (PMS) is the supervisory control that keeps the electrical plant balanced and blackout-free by automatically starting and stopping generators, synchronizing and load-sharing them, and shedding non-essential load. It watches bus load and frequency and brings a standby set online before demand exceeds capacity, then load-shares through governor and AVR droop. On overload or loss of a set it sheds preferential-trip consumers in priority order to protect the remaining generators, and it sequences heavy-consumer starts so inrush does not trip the bus. The PMS is the core blackout-prevention function in the integrated automation system.