Transformerless Line-Interactive UPS With Low Ground Leakage Current

Choi, Woo-Young; Yang, Min-Kwon

doi:10.1109/tie.2018.2815948

Cited by 13 publications

(11 citation statements)

References 23 publications

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“…Regarding transformerless topologies, in [263], a single-phase line-interactive UPS, using a bidirectional switch operating at line frequency in order to mitigate the ground leakage current is presented, and in [264], a single-phase delta conversion UPS, neither using transformers nor a dedicated dc-dc converter to perform battery charging is proposed.…”

Section: Line-interactive Uninterruptible Power Supplymentioning

confidence: 99%

A Review on Power Electronics Technologies for Power Quality Improvement

et al. 2021

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Nowadays, new challenges arise relating to the compensation of power quality problems, where the introduction of innovative solutions based on power electronics is of paramount importance. The evolution from conventional electrical power grids to smart grids requires the use of a large number of power electronics converters, indispensable for the integration of key technologies, such as renewable energies, electric mobility and energy storage systems, which adds importance to power quality issues. Addressing these topics, this paper presents an extensive review on power electronics technologies applied to power quality improvement, highlighting, and explaining the main phenomena associated with the occurrence of power quality problems in smart grids, their cause and effects for different activity sectors, and the main power electronics topologies for each technological solution. More specifically, the paper presents a review and classification of the main power quality problems and the respective context with the standards, a review of power quality problems related to the power production from renewables, the contextualization with solid-state transformers, electric mobility and electrical railway systems, a review of power electronics solutions to compensate the main power quality problems, as well as power electronics solutions to guarantee high levels of power quality. Relevant experimental results and exemplificative developed power electronics prototypes are also presented throughout the paper.

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Section: Line-interactive Uninterruptible Power Supplymentioning

confidence: 99%

A Review on Power Electronics Technologies for Power Quality Improvement

et al. 2021

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“…YNCHRONIZING CIRCUITS are essential to grid connected power electronics equipments, namely on those related with power quality applications, where they can be applied to help identifying power quality events [1]- [5]. Basically, synchronizing circuits are applied in control algorithms of active power conditioners, such as active power filters [6] [7], uninterruptable power supplies [8][9] [10], dynamic voltage restorers [11], power factor correction converters [12] [13], EV battery chargers [14] [15], and grid interface of renewables [16][17] [18]. These applications are, increasingly, considered in the context of micro-grids, where the harmonic propagation and the dynamic phase deviation occurs frequently [19] [20] [21].…”

Section: Introductionmentioning

confidence: 99%

Comparative analysis between different approaches for single-phase PLLs

Monteiro¹,

Pinto²,

Monteiro³

et al. 2022

IJPELEC

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This paper presents a comparative analysis between two distinct synchronizing circuits, which are usually applied as the core of control algorithms for single-phase power quality applications. One of these synchronizing circuits corresponds to a single-phase Phase-Locked Loop (PLL), implemented in α-β coordinates (D Dβ-PLL), whereas the other one corresponds to the Enhanced PLL (E-PLL). The major contribution of this paper is to present a single-phase PLL oriented to power quality applications, with a very simple structure, capable to be synchronized with the fundamental component of an input signal (voltage or current), even considering substantial disturbances, such as, frequency deviations, phase shifts, harmonic components and amplitude variations. Simulation and experimental results, involving these two synchronizing circuits submitted to three different test cases, are provided in order to compare their transient and steady-state performance. Moreover, it is also presented a comparison involving the processing speed and memory requirements of these synchronizing circuits in the DSP TMS320F28335.

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“…However, there will be a very small amount of reactive power compensation. Due to the incorporation of a triport transformer amongst the load and utility for isolation, the size of the system increases [22]- [25].…”

Section: Introductionmentioning

confidence: 99%

A Single-Phase Line-Interactive UPS System for Transformer-Coupled Loading Conditions

Bukhari

2020

IEEE Access

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A line-interactive uninterruptible power supply (UPS) system is one of the important installations implemented by industrial users to provide continuous power to sensitive industrial applications. Such loads often come with isolation transformers for voltage matching and protection purposes. Hence, a line-interactive UPS system experiences a serious problem of transient current when it operates under transformer-coupled loading conditions. The occurrence of this transient current can either impair the apparatus itself or turn on the overcurrent safety devices. In any situation, the interruption of electrical power for sensitive industrial loads is unavoidable. So as to keep the uninterrupted power and to eliminate transient current for industrial applications operating under transformer-coupled loading conditions, we propose a single-phase line-interactive UPS system based on a customary current-regulated inverter. The inverter of the proposed UPS system employs an improved current-regulating scheme implemented in a stationary frame of reference which regulates the load current and never let it to increase than a prescribed value as the transformer-coupled loads are turned on. Laboratory test results obtained under various operating and loading conditions of the single-phase line-interactive UPS system verify the operation of the proposed system. INDEX TERMS Line-interactive, flexible loading conditions, transient current, transformer-coupled loads.

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Transformerless Line-Interactive UPS With Low Ground Leakage Current

Cited by 13 publications

References 23 publications

A Review on Power Electronics Technologies for Power Quality Improvement

A Review on Power Electronics Technologies for Power Quality Improvement

Comparative analysis between different approaches for single-phase PLLs

A Single-Phase Line-Interactive UPS System for Transformer-Coupled Loading Conditions

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