Evaluating responsibility for voltage unbalance emission in three-phase three-wire networks

The identification of voltage unbalance sources and assessment of their impact on power quality are important matters of disagreement between a utility and customers. The standard methods of power quality measurement impose additional restrictions on a problem solution. As a result, the existing methods for voltage unbalance emission identification and assessment are valid only in the cases with a single dominating disturbing source. This paper proposes a new way to solve the problem based on the basic time interval for power quality measurement. It is a simple method of high accuracy that has no limitations as regards number and power rate of disturbing sources connected to a considered point of evaluation. The impact of input data uncertainty is verified on the basis of the simulations.