A Study on Solutions to Improve Voltage Quality and Continuous Power Supply in Distribution Power Substations

This paper proposes some solutions to improve voltage quality and continuous power supply for electric load in distribution power substations. For the solution of using voltage tap changer in the transformer, voltage ratio can be regulated and helps to improve voltage quality for electric loads at the secondary side of the transformer. For the solution of using reserved generator, the structure of power circuit will be proposed to create another source that can replace electric power in case of having a failure at one of transformers. For the solution of using uninterruptible power supplies, their designing structure will be proposed to have many switching operations such as manual/remote/automation to limit the ability to overload and increase their lifetime. A thirteen-bus grid, called E13 grid, will be also introduce in this paper to evaluate operating parameters and the effectiveness of proposed solutions. Simulation carried out by ETAP software will show the meaning of each proposed solution to improve voltage quality for all buses in the grid and ensure continuous power supply in different operating case studies. Power losses in these case studies will be also evaluated to show the overload problem of the uninterruptible power supply in case of having different length of cable after it. Simulation results will make detailed about proposed ideas and their meaning when applied in real distribution power substations.