No secure infrastructure without them - utilities
They provide the basic infrastructure and/or services such as electricity, gas, water and sanitation. The services of utilities are a matter of course for us - until they are not available.
As a result of the energy revolution, our power grids are facing a new challenge - increasingly decentralized energy generation. This brings with it the need for increased grid expansion, which can, however, be minimized through the sensible use of storage systems and corresponding power electronics. With a higher share of renewable energies in the electricity mix, the need for storage solutions for integration into the electricity system is growing all the time. Here, storage systems can be sensibly used in the distribution grid to reduce the necessary grid expansion, in the transmission grid to reduce the demand for peak load and also for system services.
Reduction of grid expansions through energy storage systems
The increased connection of single-phase decentralized loads - such as PV systems on private homes - as well as the increased single-phase charging of electric cars can create asymmetries in the distribution grid, since a large proportion of them are connected to L1. Distribution system operators also have only limited influence on how loads are ultimately connected. Although they specify a uniform distribution across all phases, they are not in a position to check these specifications to the required extent due to the immense personnel-intensive expenditure afterwards.
It is possible that these unbalanced phase currents lead not only to high loads and oversizing of equipment (distribution transformer and cables) but also to the tripping of protective devices. A further grid expansion will also be necessary due to the load limit of only one phase.
By using appropriate energy storage systems, these phase asymmetries can be compensated and savings can be achieved in grid expansion and transformer costs.
System services through energy storage systems
Battery storage systems are particularly well suited for the provision of primary control power, as they achieve fast reserve capacities compared to conventional power plants. In order to improve their efficiency, they can provide parallel system services such as frequency maintenance or reactive power supply and offer proportionally secured power. With battery prices falling in the future, this not only makes economic sense, but can also lead to a reduction in CO2 emissions due to the reduced use of conventional power plants.