Design Considerations for Frequency Responsive Grid FriendlyTM Appliances

This paper addresses design considerations for frequency responsive grid friendlytrade appliances (FR-GFAs), which can turn on/off based on frequency signals and make selective low-frequency load shedding possible at appliance level. FR-GFAs can also be treated as spinning reserve to maintain a load-to-generation balance under power system normal operation states. The paper first presents a statistical analysis on the frequency data collected in 2003 in Western Electricity Coordinating Council (WECC) systems. Using these frequency data as an input, the triggering frequency and duration of an FR-GFA device with different frequency setting schemes are simulated. Design considerations of the FR-GFA are then discussed based on simulation results