Iterative Method for Determining the Values of the Susceptances of a Balancing Capacitive Compensator

Abstract

To increase the electrical power quality, in the last decades, an intense development in the last decades of high-performance equipment built as advanced power electronics applications, such as the compensators from Switching Power Converter category, has taken place. For all that, Reactive Power Compensators (RPC) based on passive circuit elements, such as Static var Compensators (SVCs), still occupy a wide range of applications in customer and installations of the distribution system installations. The functions of power factor (PF) improvement and load balancing in a three-phase distribution network can be achieved with an unbalanced SVC, known as the Adaptive Balancing Reactive Compensator (ABRC). Presenting first the mathematical model of the initial sizing and the working mechanism of a Balancing Reactive Compensator (BRC) for a three-phase four-wire network, this article develops a compensator resizing algorithm through an iterative change of the initial sizing to transform the compensator into a Balancing Capacitive Compensator (BCC), which keeps the same functions. By using two computational and modeling software tools, a case study on the application of the method was carried out, demonstrating the availability of the sizing problem solution and validating the unbalanced capacitive compensation as an efficient way to PF improving and load balancing in a PCC (Point of Common Coupling).

Development of smooth asymmetric reactive power compensators

“…The reactive power appears when there is phase displacement between the grid current and voltage and is measured in volt-ampere reactive (VAR) units. One of the now-days main problems of the electrical grid is compensation of the reactive power in the low voltage grid (Ali et al, 2018;Arshad & Lehtonen, 2018;Balcells & Bogónez-Franco, 2013;Beck, Berlovich, & Braunstein, 2016;Beck, Berlovich, Muller, et al, 2016;Bielskis et al, 2020;Bogónez-Franco et al, 2011;Charalambous et al, 2019;Deblecker et al, 2016;Dong et al, 2012;Gayatri et al, 2018;Ilisiu & Dinu, 2019;Li et al, 2011;Merai et al, 2015;Santacana et al, 2010;Stanelyte & Radziukynas, 2020;Trentini et al, 2012;Xu et al, 2010;Yong Xue et al, 2009) Since the low-voltage three-phase lines are often loaded asymmetrically (Charalambous et al, 2019;Pană et al, 2018aPană et al, , 2018bTong XiangQian et al, 2005), the low voltage three phase lines are often loaded asymmetrically, i.e. the reactive power, which has to be compensated, is different in different phases.…”

Research on an Adaptive Compound Control Strategy of a Hybrid Compensation System

“…The rapid development of power electronics has led to their increasing popularity and usage in distribution grids, resulting in a significant rise in non-linear loads [1][2][3][4]. These loads generate notable harmonic currents and reactive power losses that have adverse impacts on both power quality and economic operation [5][6][7][8][9].…”

Asymmetric Compensation of Reactive Power Using Thyristor-Controlled Reactors

“…On the other hand, the electrical grid loads in low-voltage lines are not just three-phase but single-phase as well, and many of them use reactive power. This leads to the fact that one of the main present-day problems of the electrical grid is compensation of the reactive power in the low-voltage grid [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] and since the low-voltage three-phase lines are often loaded asymmetrically [14,[19][20][21], the reactive power, which has to be compensated, is different in different phases.…”

“…The STATCOM compensator based on inverter has a fast response time and is capable of full reactive power compensation. The main disadvantages are its high price [19,20,31] and that STATCOM devices can provide just symmetric compensation of reactive power in all three phases of the grid [32].…”