Which statement best describes synthetic inertia in renewable energy integration?

Which statement best describes synthetic inertia in renewable energy integration?

• A. Inverters on wind/solar supply extra mechanical inertia from the turbine.
• B. Synthetic inertia emulates inertia using fast-acting controls and energy storage to mimic inertial response.
• C. Inverters on wind/solar provide kinetic energy to the grid.
• D. Synthetic inertia reduces system inertia by design.

Answer: (B)

Synthetic inertia captures the stabilizing effect of the rotating mass in traditional generators. When renewables dominate, there’s less physical inertia, so fast-acting controls plus energy storage act like a short-term reservoir of power that can be tapped within milliseconds to seconds to oppose frequency changes. That is exactly what the statement conveys: it emulates inertia using fast controls and energy storage to mimic the inertial response. Inverters on wind or solar don’t provide actual mechanical inertia from turbine mass, and they don’t deliver real kinetic energy to the grid. Instead, they can rapidly adjust power output to mimic that effect, which is the essence of synthetic inertia. The idea is to preserve grid stability by reproducing the quick, temporary response that inertia would normally provide, not to reduce inertia or to supply genuine kinetic energy.

Synthetic inertia captures the stabilizing effect of the rotating mass in traditional generators. When renewables dominate, there’s less physical inertia, so fast-acting controls plus energy storage act like a short-term reservoir of power that can be tapped within milliseconds to seconds to oppose frequency changes. That is exactly what the statement conveys: it emulates inertia using fast controls and energy storage to mimic the inertial response.

Inverters on wind or solar don’t provide actual mechanical inertia from turbine mass, and they don’t deliver real kinetic energy to the grid. Instead, they can rapidly adjust power output to mimic that effect, which is the essence of synthetic inertia. The idea is to preserve grid stability by reproducing the quick, temporary response that inertia would normally provide, not to reduce inertia or to supply genuine kinetic energy.