Step-by-step calculation of reactive power compensation in electrical distribution networks using relative voltage drops

A method of phased installation of compensating units in electrical distribution networks using relative voltage drops as integral indicators was proposed. Introduction of compensating units is one of the most effective ways to reduce electricity losses in distribution networks. In accordance with the existing methods this task is carried out in two ways: maximum reduction of losses and providing acceptable levels of voltage in load nodes. Complicated mathematical methods, nonlinear programming methods in particular, are necessary to solve this problem. Results of the calculations, obtained by these methods, are difficult to be checked on compliance with both criteria, since they characterize different technical parameters. On the other hand, these criteria are of common physical nature which makes it possible to form the integral indicators evaluating both active power losses and voltage drops. The aim of the article is to research and use integral indicators which evaluate both active power losses and voltage drops. A mathematical model of positioning compensating units in electrical network was presented. A calculation example of the phased establishing of compensating units in electrical distribution network by two methods: the one being in use now and the proposed one were presented. Calculation results are given in tabular and graphical forms. These results show the coincidence of the results obtained by these two methods. Proposed method provides minimum active power losses, specified relative voltage drop value and makes it possible to simplify the introduction of compensating units through linearization