Inertia and the Power Grid: A Guide Without the Spin
Inertia from rotating electrical generators in fossil, nuclear, and hydroelectric power plants represents a source of stored energy that can be tapped for a few seconds to provide the grid
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is the mechanical torque on the rotor; is the electrical torque on the rotor; is the mechanical power; is the electrical power; is the small change in rotor speed; and D is the damping term constant added to the equation
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6 Frequently Asked Questions about “Principle of inertial energy storage power generation”
What is power system inertia?
Power system engineers typically describe the inertia of a generator in terms of stored rotational kinetic energy (EPRI 2019), so inertia has the same units of energy (power delivered over a period of time).
What is inertia in power plants?
Inertia from rotating electrical generators in fossil, nuclear, and hydroelectric power plants represents a source of stored energy that can be tapped for a few seconds to provide the grid time to respond to power plant or other system failures.
How does inertial response affect electricity generation?
To accommodate the imbalance between supply and demand due to the drop in generation, the remaining online generators convert their rotational kinetic energy (inertia) into real power generation—referred to as inertial response. This process slows the generators and results in a drop in grid frequency.
What is the inertia constant of a generator?
This means the inertia constant represents how long the generator could generate at its rated power using only its stored rotational kinetic energy, so the inertia constant is measured in units of seconds. 1-GW generator with an inertia constant of 4 seconds could deliver 1 GW of power for 4 seconds (or has 4 GW•s of stored energy).
How much inertia does a 100 MW power plant provide?
This means that a 100-MW (rated) power plant operating at 60 MW can provide 40 MW of “upward” operating reserves, while the same plant operating at 100 MW cannot provide any. However, this plant will provide the same amount of inertia while operating at either output level or any level in between.
How can inertia be maintained?
Summary of Options to Maintain Frequency Stability Inertia can be maintained via operating the grid to ensure the mix of generators online exceeds critical inertia levels.22 Figure 13 showed how as both VG and load vary, power plants are turned on and off, which results in changes in the amount of inertia available.