Fraunhofer Institute for Solar Energy Systems ISE
The number of large-scale battery storage projects in Germany is growing rapidly. However, it is important to note that large-scale battery storage systems, which are primarily operated according to energy market mechanisms, can exacerbate local power peaks due to unfavorable charging and discharging behavior, thereby increasing the load on transformers and power lines. A large-scale battery storage system is beneficial to the grid if its location in the grid and its mode of operation reduce the load on the grid, which then leads, for example, to a reduction in the need for grid expansion.
We examine whether large-scale battery storage systems can be operated in a grid-friendly manner at specific locations. To do this, we analyze generation and load time series of the relevant substation, model the resulting power flows, and simulate grid-friendly operating strategies to assess whether peaks are reduced. In addition, we analyze whether redispatch measures have been taken at the specific location in the past. Redispatch measures are taken to avoid equipment overload and thus ensure grid security. Battery storage could help to reduce redispatch locally.
