Synchronous energy storage system with inertia capabilities for angle, voltage and frequency stabilization in power grids

In future power systems voltage and frequency will mainly be formed by synchronous inverter-based power plants with advantageous capabilities compared to today's synchronous machines. This paper introduces a synchronous energy storage system solution (SESS) with grid forming capabilities for voltage, angle and frequency strength improvement in distribution and transmission networks. Configurable control modes for inertia and damping provision are presented. Application examples and performance capabilities for inertia, instantaneous fault current, power oscillation response as well as power reserve provision are shown based on simulation results and practical laboratory experiments. The challenges for accelerated grid integration of SESS are outlined as well.