Frequency stability with converter-connected resources delivering fast frequency control

Converter-connected resources, such as electric vehicles and stationary batteries, are being recognized by grid operators contributors to frequency stability. Their fast-response potential makes them ideal candidates provide fast control. In this paper we discuss present evidence on what kind of dynamics a power system experiences when using Initially, method assess balance deriving so called residuals, given historical time series components characteristics. The residuals consist the non-controllable, not explicitly measured, part generation load. Afterwards, Danish island Bornholm, where used commercial basis primary control, is test-bed for investigation. analysis supported validating described models against real measurements from islanded system. key outcome that overall response needs be within 1 second. For considered scenarios, share reserve provided should up 30% improve We finally generalize results highlighting factors needed replicate findings in other systems.