What is electrical energy storage (EES)?

Electrical Energy Storage, EES, is one of the key technologies in the areas covered by the IEC. EES techniques have shown unique capabilities in coping with some critical characteristics of electricity, for example hourly variations in demand and price.

Why is energy storage important in a power system?

Energy storage is a potential substitute for, or complement to, almost every aspect of a power system. It can improve generation, transmission, and demand flexibility. Storage should be co-optimized with clean generation, transmission systems, and strategies to reward consumers for making their electricity use more flexible.

Why is electricity storage important?

In the electricity market, global and continuing goals are CO 2 reduction and more effi cient and reliable electricity supply and use. The IEC is convinced that electrical energy storage will be indispensable to reaching these public policy goals.

How is thermal energy stored?

Thermal energy is stored solely through a change of temperature of the storage medium. The capacity of a storage system is defi ned by the specifi c heat capacity and the mass of the medium used. Latent heat storage is accomplished by using phase change materials (PCMs) as storage media.

What is energy storage medium?

Batteries and the BMS are replaced by the “Energy Storage Medium”, to represent any storage technologies including the necessary energy conversion subsystem. The control hierarchy can be further generalized to include other storage systems or devices connected to the grid, illustrated in Figure 3-19.

What is a stationary battery energy storage (BES) facility?

A stationary Battery Energy Storage (BES) facility consists of the battery itself, a Power Conversion System (PCS) to convert alternating current (AC) to direct current (DC), as necessary, and the “balance of plant” (BOP, not pictured) necessary to support and operate the system. The lithium-ion BES depicted in Error!