Measurement of Both Full Activation Time and <scp>ICT</scp> Response Time for Fast Demand Response of Electric Vehicle Charging ^†

Abstract The flexibility of distributed energy resources (DERs) has been receiving increasing attention. One important issue to use DERs' flexibility for fast demand response, like for secondary reserves, is their full activation time (FAT) and ICT (Information communication technology) response time (IRT). Though studies have reported the inherent activation time of various DERs, time‐synchronized measurement results of both ICT latency and the FAT are still lacking. We have constructed an experimental system to measure them synchronously with the local time server, excluding cloud timestamps. This paper reports on the experimental system and the characteristics of measured FATs and IRTs of the following DERs; one vehicle‐to‐home equipped charger (controlled both via the Internet and via the LTE‐M) and one Mode 3 normal charger, as examples. This information of FAT will be useful for designing the group control and monitoring system of the electric vehicle charging for fast demand response. © 2025 The Author(s). IEEJ Transactions on Electrical and Electronic Engineering published by Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.