Electrical Balancing Authorities and Frequency Response

Flashcards covering key terms related to Balancing Authority operations, frequency response, and system stability.

Area Control Error (ACE)

The real-time 'score' indicating how well a Balancing Authority maintains actual power flows matching scheduled flows.

Disturbance

A sudden, unplanned event that disrupts normal grid conditions, causing an unexpected jump in ACE.

Dynamic Schedule

A flexible energy transfer agreement that adjusts in real-time and is treated like a normal schedule in ACE calculations.

Frequency Bias Setting

A value that dictates how much a Balancing Authority should assist with frequency corrections, expressed in MW per 0.1 Hz.

Frequency Response

The combined changes in generation and load in response to frequency changes in the grid.

Frequency Response Measure (FRM)

The median value of all frequency response results from Balancing Authorities collected over a year.

Frequency Response Obligation (FRO)

The assigned responsibility of each Balancing Authority to provide a specific amount of frequency response.

Frequency Response Sharing Group (FRSG)

A collaboration between multiple Balancing Authorities to collectively meet their frequency response obligations.

Generator Droop Characteristic

A feature that allows generators to smoothly work together on governor control without competing with one another.

Governor Droop

The percentage change in generator output in response to a frequency deviation.

Inertia

The natural resistance of spinning machines to changes in speed, contributing to the stability of the power grid.

Overlap Regulation Service

Service where one Balancing Authority assists another by including the other's power flows and schedules in its control calculations.

Pseudo-Tie

A virtual tie line that acts like a real physical tie line in Actual Net Interchange for ACE calculations.

Generation-Load Balance

The equilibrium achieved when generation meets load requirements, maintaining system frequency.

Frequency Response Actions

Immediate changes in generation and load that occur automatically to stabilize frequency after an imbalance.

Governor Response Delay

The slight delay (three to four seconds) before a generator increases output after a frequency drop is detected.

Governor Deadband

The small range of frequency change that a governor ignores before beginning to respond.

Frequency Bias Accuracy

The importance of setting Frequency Bias to ensure proper Frequency Response and system stability.

Actual Net Interchange (NIa)

The actual flow of power into or out of a Balancing Authority area, which reflects its frequency response.

Scheduled Net Interchange (NIs)

The planned power flow established for a Balancing Authority, which serves as the basis for comparisons with actual interchange.

Negative ACE

When Area Control Error goes into the negative, indicating a deficient balancing authority in need of increased generation.