Sequential hybrid power-flow and EMT simulations for investigating power quality in distribution grids

Distribution grids are facing significant changes. Investigations into power quality (PQ) phenomena are necessary to ensure a reliable and disruption-free power supply. There are generally few PQ measurement devices installed in lower voltage levels and installation is event-related or temporary. Future scenarios, which will affect connected devices, equipment, grid operation and customer behaviour are not represented in measurement data. Simulations are necessary to depict these changes. Electromagnetic Transient (EMT) simulations are suitable to map the influence of individual components, controls and dynamic relationships and simulate the entirety of phenomena. However, large-scale EMT simulations require significant computational effort, even though most time step results are quasi-stationary.