An Assessment Method for Power Quality Line Loss in the Transformer Area

There are still a large number of low-voltage distribution transformers that can only rely on the power supply and sale of the transformer area to calculate line loss, and the network topology and line parameters are ambiguous. The meters used for statistics of power supply and sales are all designed and developed based on traditional power theory, and are only suitable for sinusoidal balanced conditions, unable to analyze non-sinusoidal and unbalanced conditions. This paper proposes a method for measuring and evaluating the line loss of power quality in the transformer area. This method decouples line losses based on IEEE 1459 and uses graph theory to solve the power quality line losses power factor of branch. By establishing the solution function of the power factor of line loss in the transformer area, clarifying the constraint conditions, the power quality line loss is solved by using the line loss of supply volume, the power factor of line loss of each branch, and the fuzzy range of line parameters. The simulation of the actual transformer area model shows that this method can calculate the line loss when the line impedance and length are not clear.