The Kriftel substation between Frankfurt and Wiesbaden in the German federal state of Hesse controls power distribution for the greater Frankfurt area with its almost six million inhabitants. The station is operated by TSCNET shareholder Amprion, one of the four German transmission system operators (TSOs), which has been expanding and modernising it since 2016 and has invested a total of around €34m. During a ceremony held on 30 August with representatives of state and local politics, the new, state-of-the-art equipment in Kriftel was put into operation.
Amprion’s substation not only secures the power supply in the northwestern Rhine-Main area but will now also play an important role in providing reactive power. The installation of the relevant technology in Kriftel became necessary due to the changes in power generation and feed-in in Germany. The declining reactive power capacities of large power plants, which are now being successively taken off the grid in the course of the energy transition, must be compensated by the national TSOs to keep the reactive power in balance with the active power and thus keep the grid voltage at the required level.
The hybrid reactive power compensation system installed in Kriftel is the most powerful of its kind in the German grid. It consists of two units: a static synchronous compensator system (Statcom) and a mechanical switched capacitor with damping network (MSCDN). Depending on requirements, they can raise or lower and secure the voltage in the grid. Dr. Klaus Kleinekorte, CTO at Amprion, explained the importance of the new system technology: “By optimising the switching of many electronic modules, the new hybrid system in Kriftel will help to keep the voltage level in the grid stable and thus continue to guarantee a high level of supply security in the region.”