Examination of different voltage asymmetry norms under transient behavior of three-phase low voltage power systems containing small domestic power plants

The three-phase unbalance problem is a familiar issue. It can introduce additional power losses in distribution networks due to both negative and zero sequence components. It could also limit the loading capability of distribution transformers, well below their nominal ratings. There are many voltage unbalance definitions for three-phase three-wire systems. This paper proposes new indicators of the unbalance power that allows a different tool for analysis of inefficiencies caused by nonlinear loads. The aim of this paper is to examine the available measures of voltage asymmetry and make a comparison from the transient behaviours point of view. As a next step, a compensation algorithm is to be developed which is based on a loss function derived from the results of the present analysis.