The use of battery systems for applications with short-term high-power peaks issues a challenge in terms of an economical design due to a physical relationship between capacity and maximum power. In such applications, it is reasonable to combine batteries and supercapacitors in order to reduce the power peaks on the batteries. In so doing, a more advantageous design in terms of size, service life and costs of the storage system can be achieved.
Examples of applications in which the hybrid storage systems can be used are:
- stationary storage systems used for transient grid support for fast primary control and synthetic inertia, among other applications
- electric vehicles, in particular commercial vehicles, with limited range and frequent starting and braking
In such applications, the service life of the batteries can be significantly improved by combining them with supercapacitors. That results in a reduction in required battery capacity and an improvement in total cost of ownership (TCO) of the system. However, there are currently no tools that allow systematic system design and operational optimization, taking into account the influence of operating parameters on aging.
Therefore, the objective of the proposed joint project is to develop a suitable methodology and resulting design tools and control procedures for the cross-application use of hybrid storage systems. The overall objective is to establish the use of battery storage systems in high-performance applications in which an economic application has not been possible so far.