Influence of aggregation intervals on power quality assessment according to EN 50160

EN 51060 [1] characterizes the product quality of electricity and is the most important standard for voltage quality assessment in Europe. The value of a particular continuous voltage quality parameter (e.g. unbalance) depends on several calculation parameters like aggregation interval and assessment quantile. Usually the EN 50160 assessment is based on 95-%-quantiles of the 10-minute-mean values for one week. The paper studies the impact of these calculation parameters and shall give an impulse for the on-going discussion of the pros and cons of their change in standards or regulation rules. The analysis is based on a comprehensive database of more than 1000 measurement weeks in 14 different public low voltage grids in Germany. The main part of the paper studies systematically the impact of aggregation interval (1min, 10min, 30min), aggregation method (mean, max) and assessment quantile (95%, 99%) on the following voltage quality parameters: magnitude, selected harmonics, THD and unbalance.