Frequency Actuated Load Shedding and Restoration Part I - Philosophy

During the last few years, there has been expanded effort throughout the country to install frequency actuated load shedding programs for the purpose of providing means to safeguard a power system should a condition of declining frequency occur. Hand in hand with a load shedding program a convenient means must be provided for restoring load after the system returns to a normal state. In this series of papers, the authors will present some of the basic principles which should be considered in the application of a load shedding and load restoration program and will describe the philosophy which led to the frequency actuated load shedding and load restoration program being implemented on the American Electric Power System. As part of this presentation, the various analytical studies which were carried out to determine the load management programs for the AEP system will be described in detail. In addition, the method of program implementation and management is presented in a companion paper.