Under voltage load shedding for voltage stability overview of concepts and principles

Undervoltage load shedding (UVLS) has been employed in the electric utility industry as a ´safety net´ measure to prevent or reduce the possibility of voltage collapse due to low-probability/high impact disturbances. This work provides an introduction to and provides an overview of the design and implementation considerations of a UVLS scheme. An overview of the power system equipment that impacts UVLS design and operation is provided. This is followed by a discussion of some UVLS fundamentals.