Survey on emission characteristic of the symmetrical components of voltage and current in LV grids

Abstract

The voltage and current unbalance in low voltage (LV) grids depends on the background distortion of the upstream grid and the emission characteristic of the devices connected to the grid. Based on an extensive measurement database of single households, individual feeders and whole LV grids, the paper discusses the emission characteristic of the negative sequence voltage of the upstream grid and the emission levels of symmetrical components of the currents in LV grids. The results of the survey are useful to develop simplified models to estimate the unbalance in LV grids.