Industrial Automatic Control Systems and Controllers Annotation << Back The Algorithm Control Level of Asymmetry in the Distribution Network T.E. Turukina, E.A. Shutov, I.I. Elfimov, V.K. Sibirtsev The paper dwells on the unifi ed power quality indexes characterizing the phenomenon of voltage unbalance in threephase systems. Voltage unbalance is one of the commonest occurrence in the town mains of 0,38 kV voltage. The phenomenon describes as inequality of vector magnitude of phase voltage and shearing angle between them. Causes and consequences of the voltage unbalance in distribution networks have been considered. The algorithm, which allows switching one-phase load, has been developed as one of a method of reducing the unbalance level. The algorithm is written in the function block diagram programming language. For determining the duration and magnitude of the unbalance level it is proposed to introduce the forecasting algorithm. The necessary data for forecasting is accumulated in the course of the algorithm based on the Function Block Diagram. The algorithm example is given for transforming substation of the urban electrical power supply system. The results of the economic effi ciency assessment of the algorithm implementation are shown in conclusion. Keywords: unbalance; supplementary power losses; load switching algorithm; electric power quality; distributing networks; function block; balancing system; forecasting; microcontroller. Contacts: E-mail: tan4uk89@gmail.com, E-mail: shut63@mail.ru Pp. 23-30.