Experimental Harmonics Analysis of UPS (Uninterrupted Power Supply) System and Mitigation Using Single-Phase Half-Bridge HAPF (Hybrid Active Power Filter) Based on Novel Fuzzy Logic Current Controller (FLCC) for Reference Current Extraction (RCE)

Abstract

UPS Uninterruptible power supply) is used as backup when the input source, usually the national grid, fails to give power to a load. In addition to the growing use of electronic power devices in industrial and residential systems, such as UPS, controlled rectifiers, SMPS (Switch Mode Power Supplies), and DC Converters, there is a serious problem caused by harmonics in AC mains, which lowers the power quality. Harmonics can cause a variety of problems, including sensitive equipment failure, resonance issues, heated wires, power loss, and inefficient distribution systems. A passive or active power filter could be used to reduce harmonics. However, passive filters are more difficult to design and are bulkier. With the advancement of power electronics, active power filters were developed, and the best combination of both was supplied in the form of hybrid active power filters (HAPF). This study shows an approach to minimizing the harmonics contained in the output of a UPS connected to a nonlinear load. Experiments with several UPS types have been conducted under various nonlinear loads, as well as charging and discharging of batteries, and the proposed technique significantly reduces harmonics in a system with a HAPFs (hybrid active power filter) based on a unique FLCC (fuzzy logic current controller). In this paper, we use a fuzzy logic controller to generate pulse width modulation (PWM) switching signals in a single-phase half-bridge HAPF. The operation of the proposed PWM-FLCC will be studied in a steady and transient state. Based on a connection between the uninterrupted power supply (UPS) supplying a single-phase power to a nonlinear load, different power filter topologies and a brief review of reference current extraction (RCE) methods used in this study were also included and the most common configurations have been compared with their advantages and disadvantages to ensure the right selection of the power filter for UPS connected with the nonlinear load. The results of the investigation demonstrate that the HAPF with the fuzzy logic current controller has reasonable performance, with a significant reduction in current THD down to 1.09%, as per IEEE-519 standard.

A four-line active shunt filter to enhance the power quality in a microgrid

“…The reverse current produced by the inverter is introduced into the system to compensate for the harmonic currents; these currents are obtained using the p-q theory. To achieve neutral current compensation, two main topologies are used: (i) inverters to generate voltages; (ii) Inverters with two midpoint capacitors and a four-arm inverter (used as an active filter) (Barva et al 2018;Kumar et al 2022;Collins et al 2022;Zhang et al 2022;Challa et al 2022). Mainly, the four-wire shunt active filters, with three phases, have three branches with two switches controlled by the PWM technique and the fourth leg is on standby and has two switches controlled by the PWM technique.…”

Performance Evaluation of Varying Triggering Angles on Single-Phase Semi-Bridge Controlled AC-DC Converter

“…The main problems of thyristors based AC-DC converts are the issue of harmonics and low power qualities [5]. The setback associated with harmonics and low power factor are minimized by increasing the number of pulses (multiphase AC-DC converters such as 6-pulse, 12-pulse, 18-pulse, 24-pulse, 36-pulse, 48-pulse) [6][7] and applications of filter components (both active and passive types) and they have been addressed and published online by many authors [8][9][10].…”

Application of Deep Learning Gated Recurrent Unit in Hybrid Shunt Active Power Filter for Power Quality Enhancement

“…The suggested adaptive-HSAPF is monitored using MATLAB/Simulink and real-time scenarios under steady-state and transient conditions. A fuzzy logic controller is applied for a single-phase half-bridge for PWM generation [31]. The performance is tested in transient and steady-state conditions.…”