Investigation of background noise in active distribution network and its impacts on synchrophasor estimation

Abstract

The next-future extensive diffusion of distributed generation and the increasing energy demands due to new components (e.g. electrical vehicles, energy storages) are changing the characteristics of the power grid at the distribution level, which makes it inevitable to introduce the synchrophasor measurement technology into the distribution network. This study analyses the power spectrum for the background noise of the field measured voltage signal of 0.4 kV in one electrical vehicle charging station. The coloured filter model is established using the autoregressive moving average process, which leads to the conclusion that the coloured noise spectrum is generally concave. The impact of background noise for the phasor estimation is evaluated in the steady state and dynamic state referring to IEEE Std C37.118.1™-2011.