Technological prerequisites for evaluating unbalanced operating modes in components of low-voltage power supply systems and ways to minimize the consequences of these modes

The purpose of the scientific article is to develop a technology for evaluating unbalanced modes in the 0.4 kV power supply system’s components and a way to minimize the consequences of these modes. It is established that the imbalance of the operating modes of the studied electrical networks is due to the asymmetry and non-sinusoidal nature of the three-phase power supply voltage system. The additional symmetrical components of the negative and zero sequences arising in this case, due to the fundamental frequency, as well as the components of the positive, negative and zero sequences due to the emission of higher harmonic components, cause a deterioration in the power quality and an increase in electrical energy losses. A universal balancing device has been developed that allows you to automatically change your parameters at any given time, depending on the changing of unbalanced power consumption level. Due to this, there is a significant improvement in the power quality and electricity losses are reduced by more than 50 %. As a methodological basis for the study, the methods developed by the author for evaluating unbalanced modes during integration into the electrical network of the proposed balancing device model were used. Based on the presented calculation algorithms, the developed software for calculating unbalanced modes is proposed. As an approbation of the results obtained, a simulation modeling of the a balancing device connection to the operating system of the workshop power supply of one of the industrial enterprises was performed, which proved the effectiveness of using the obtained research results.