Assessment of rapid voltage changes using PMU data

Recently the main IEC standard on measurements in the frame of power quality has been updated [1], and a new section has been added for rapid voltage changes [RVC] assessment. Also, in the standard it is acknowledged the variability of voltage signals and the need of validation of the “steady state” behavior of the system characterizing the measurement context. In this context it is proposed the 1s time interval within the voltage variability should relate to the dynamic behavior. This paper addresses the potential implications of the new standard on the measurement layer in LV grids and on the knowledge management process for various power systems applications. PMU data obtained with the highest reporting rate is used to identify a rapid voltage change event and to potentially discriminate it from voltage sags or swells.