Inertia and Frequency Control in Renewable-Dominated Power Systems
Summary
As power systems transition towards high shares of wind, solar and other inverter-based generation, the traditional source of rotational inertia provided by synchronous machines is diminishing. Inertia acts as a buffer against abrupt power imbalances by slowing the rate of change of frequency (RoCoF) following disturbances. A reduction in inertia exacerbates frequency excursions, challenging secure operation and increasing the risk of widespread outages. To address this, grid operators and researchers are deploying a combination of solutions: synthetic inertia algorithms that emulate the inertial response of conventional generators; fast frequency-response services from battery energy storage systems; grid-forming converters that actively regulate voltage and frequency; and synchronous condensers that supply both inertia and short-circuit strength. Advanced control strategies integrate these technologies to coordinate responses, ensuring frequency nadir and RoCoF remain within secure limits. This evolving field spans techno-economic assessments, real-time simulation studies and field deployments, reflecting its global importance for delivering secure, low-carbon electricity systems.
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Inertia and Frequency Control in Renewable-Dominated Power Systems publication trend
The graph below shows the total number of articles in inertia and frequency control in renewable-dominated power systems across all publications each year (not limited to Nature Index journals).
Technical terms
Inertia: The stored kinetic energy in rotating masses that resists sudden changes in system frequency following a disturbance.
Synthetic inertia: A control function in power electronic converters that emulates the inertial response of synchronous machines by injecting or absorbing power based on frequency deviations.
Rate of Change of Frequency (RoCoF): The speed at which system frequency changes, typically measured in hertz per second (Hz/s), following a generation or load imbalance.
System strength: A measure of a grid’s ability to maintain voltage and frequency stability during faults and dynamic events, often linked to short-circuit levels.
Synchronous condenser: A motor-generator unit operated without a prime mover, providing inertia, reactive power support and fault current contribution to the grid.
Grid-forming converter: A power electronic interface that actively regulates voltage magnitude and frequency, enabling stable operation in low-inertia environments.
Inverter-Based Resource (IBR): A generation or storage asset that connects to the grid through power electronic converters rather than direct synchronous coupling.
Battery Energy Storage System (BESS): A grid-scale battery installation capable of rapid charge and discharge to deliver ancillary services such as frequency support and synthetic inertia.
References
- A Techno-Economic Assessment to Define Inertia Needs of the Italian Transmission Network in the 2030 Energy Scenario. IEEE Transactions on Power Systems (2023).
- Challenges and Mitigation Measures in Power Systems with High Share of Renewables—The Australian Experience. Energies (2022).
- Strengthening Power Systems for Net Zero: A Review of the Role of Synchronous Condensers and Emerging Challenges. Energies (2024).
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