Abstract
This paper discusses a novel analysis scheme based on the hybrid interface of Optical USB and Power Quality Meter for measuring Total Harmonic Distortion (THD) that exists in the Uninterruptable Power Supply (UPS) system and connected load. The designed hybrid interface experimentally analyzes the power quality and harmonics of the Uninterrupted Power Supply (UPS) system, and mitigation is proposed with the proposed Single-Phase Hybrid Active Power Filter (HAPF) based on instantaneous Power Theory (PQ) with hysteresis control technique and synchronous frame reference (DQ) with hysteresis control techniques at nonlinear load. This study authenticates and gives appropriate measurements in analyzing the harmonics and voltage distortion during conversion of power. The designed work offers the compensation and elimination of harmonic currents using PQ and DQ theory at different nonlinear loads. The proposed HAPF for the UPS system has demonstrated the significant reduction in THD using proposed Power Theory (PQ) with hysteresis control technique from 46.58% to 1.51% and by using DQ theory with hysteresis control technique has reduced THD from 46.58% to 1.38%. Finally, the results are compared between PQ and DQ. It is validated via results that DQ theory eliminated harmonics and also having less THD as compared to PQ-theory. Furthermore, one of the key aspects of the work is the analysis of power quality using Optical USB Interface (OC4USB) and FLUKE series power quality analyzer.
Highlights
Hybrid Active Power Filter (HAPF) design and modeling of Single-Phase Instantaneous PQ technique and Single-Phase DQ Reference technique are carried out to mitigate Total Harmonic Distortion (THD) of Uninterrupted Power Supply (UPS) system and connected load. e results are given for both techniques in Table 2, and the proposed models’ THD results obtained without the HAPF filter is 46.58%, and after HAPF application, obtained THD 1.51% and 1.38% as compared with the past work 3.29% [34] which meets the international standard requirement of harmonics and should be less than 5% as per IEEE STD-519-1992 [32]
With using the proposed HAPF based on PQ and DQ Hysteresis control technique, the THD has been dropped significantly, and it is noted that system THD achieved less than 1.51% using HAPF based on PQ technique and system THD achieved less than 1.38% using HAPF based on DQ technique which is a significant decrease
Authors have proposed novel Single-Phase HAPF for the UPS system and connected nonlinear load, and HAPF is developed on basis of THD experimental results of the UPS system
Summary
Real Time Experimental THD Analysis of Single-Phase UPS System through Hybrid Interface Using Optical USB and Power Quality Meter. It is observed from the experimental results that average THD of the UPS system is more than 46%, and on basis of this proposed latest HAPF, it is more effective and efficient technique for mitigation of THD as compared to other passive filters and active power filters (APF)
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