Primary Control

A.k.a. Frequency Response.

Definition by NERC

Source: ¹

More commonly known as Frequency Response. Frequency Response occurs within the first few seconds following a change in system frequency (disturbance) to stabilize the Interconnection.

---

Last modified: 2025-06-22

Related: fast-frequency-response · secondary-control · tertiary-control · frequency-regulation · automatic-generation-control · frequency-stability

← Power Transfer Distribution Factor · Primary Frequency Response →

---

1. NERC (2021). Balancing and Frequency Control Reference Document. https://www.nerc.com/comm/RSTC_Reliability_Guidelines/Reference_Document_NERC_Balancing_and_Frequency_Control.pdf ↩