Computer Simulation Of Voltage Unbalance Reduction In Power Supply Systems

Abstract

The article discusses the issues of ensuring the quality of electricity in power supply systems. It is shown that during the operation of power supply systems in certain cases the quality of electrical energy can be violated, including due to the uneven load of the electrical network phases, that leads to a significant asymmetry of voltages in this network. The emergence of a large difference between the voltages in the phases of the electrical network inevitably leads to negative effects on various electrical equipment of both power supply organizations and consumers' electrical equipment, thereby creating conditions for the occurrence of technological and electromagnetic damage, which are the reasons for the appearance of financial losses and other negative consequences in case of electricity quality violations. The results of voltage unbalance measurements obtained by the authors of the article while monitoring the power quality are presented. These results show that during the operation of power supply systems, modes arise in which the voltage asymmetry in the zero sequence significantly exceeds the permissible values. It is shown on a computer model of the simplest power supply system that reducing the resistance of the neutral conductor can serve as a rather effective measure to reduce voltage unbalance, especially when inductive load prevails in the composition of consumers.