System Frequency Response Calculator

Calculate frequency deviation and ROCOF from a generation imbalance.

Nominal Frequency

System Inertia (H)

Total Generation

Power Imbalance

Governor Droop

Load Damping

Tab to move between fields

ROCOF

0.12 Hz/s

Frequency Nadir

59.91 Hz

Steady-State Frequency59.94 Hz

Steady-State Deviation0.06 Hz

Time to Nadir0.75 s

How to Use This Calculator

Enter Nominal Frequency, System Inertia (H), and Total Generation.
Set Power Imbalance, Governor Droop, and Load Damping.
Review ROCOF (Hz/s) and Frequency Nadir (Hz).
Use Steady-State Frequency (Hz) and Steady-State Deviation (Hz) to inform your decision.

How the result changes with Nominal Frequency

Nominal Frequency: System nominal frequency (60 Hz in North America, 50 Hz in Europe).
System Inertia (H): Weighted average inertia constant of all online generators.
Total Generation: Total online generation in the system.
Power Imbalance: Sudden generation loss or load increase.
Governor Droop: Average governor droop setting of online generators.
Load Damping: Load sensitivity to frequency changes.

Identify Input Parameters
4 parameters
Nominal Frequency = 60, System Inertia (H) = 5, Total Generation = 50000, Power Imbalance = 1000 = 6 input(s) provided
Calculate ROCOF
ROCOF
0.12 = 0.12
Calculate Frequency Nadir
Frequency Nadir
59.91 = 59.91
Calculate Steady-State Frequency
Steady-State Frequency
59.94 = 59.94
Calculate Steady-State Deviation
Steady-State Deviation
0.06 = 0.06