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Voltage coordination using reactive power between grid operators

The change in the energy system towards decentralised generation also means a change towards a decentralised organisation for the coordination and operation of the grids. This change is taken into account by the new grid management (Redispatch 2.0) process. However, this process is primarily aimed at active power. The reactive power generated locally during transport has not yet been explicitly considered in the new coordination process. Reactive power ensures that the grid voltage remains stable and the active power can be reliably distributed. The challenge is that reactive power has a highly non-linear behaviour and can only be generated and used relatively locally (i.e. in the vicinity of the respective generation plant).

The SPANNeND research project team therefore wants to develop a standardised, robust and interoperable method to reliably integrate reactive power potential from the distribution grid into the transmission grid management processes. The use of reactive power is intended to optimise redispatch dimensioning and keep the grids stable and secure. The reactive power flexibility available to the transmission system operator is to be offered uniformly via the redispatch platform and thus optimally dose (minimise) the necessary redispatch measures. The work should improve the predictability of grid operation, increase system security and stability and reduce costs for redispatch and grid congestion management.

Based on preliminary work on reactive power optimisation (Q-OPF) and provision, the research team intends to develop standardised methods, including implementation guidelines, and test them in field tests with the participating distribution system operators. In this context, emsys grid services will focus on the sub-project "Process integration of reactive power optimisation in a redispatch platform".

The project, which is funded by the Federal Ministry for Economic Affairs and Climate Protection, is run by the Jülich Research Centre. The project is scheduled to run from 2022 to 2024.

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