Services to Support Transmission Infrastructure
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1
Transmission Grid Upgrade Deferral (existing service)
The objectives are:
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To use energy storage to defer or avoid transmission infrastructure upgrades and solve transmission congestion issues by installing energy storage systems instead of new lines.
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To use energy storage as a transmission grid component in order to decrease the “traditional” grid size during the grid planning process by basing its design on a medium power value and not a peak power value.
2
Contingency Grid Support (existing service)
The objective is to use energy storage to provide
capacity/voltage support in order to reduce the impacts of the loss of a major grid component. It refers to redundancy provisions to cover the trip of the largest transmission element into an area.
3
Transmission Support (existing service)
The objective is to use energy storage to improve the performance of the transmission system by compensating for electrical anomalies and disturbances such as voltage sag, unstable voltage, sub-synchronous resonance, and power quality.
4
Power Oscillation Damping (POD)
To use energy storage to damp electromechanical oscillations. Oscillation frequency could be between 0.15 Hz (inter area oscillation) and 2.5 Hz (local oscillation).
5
Participation to Angular Stability (expected to emerge)
Use of energy storage to charge and discharge high levels of energy in short periods when a fault/angle change occurs; this may contribute to reduce the load-angle variations, thereby improving angular stability of the system.
6
Reactive Power Compensation
Use of energy storage to reduce the amount of reactive power, by decreasing voltage fluctuations within the transmission network.
7
Cross Sectoral Storage (emerging service)
Practice of coupling the electricity sector with other energy sectors (gas, fuel, heat) by converting excess supply of electricity to the grid into energy carriers, synthetic fuels, and heat, thus avoiding curtailment of running power generators (RES, thermal power plants, etc).
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