A single-phase on-line UPS system for multiple load transformers

Bukhari, Syed Sabir Hussain; Kwon, Byung-il

doi:10.1587/elex.14.20170050

Cited by 2 publications

(1 citation statement)

References 12 publications

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“…These problems often disturb the process of manufacturing processes and lead to paraphernalia impairment [1,2]. Because UPS systems are intended to automatically deliver backup power to critical loads, an off-line UPS system takes over the load completely within a quarter cycle whenever a disturbance occurs on the utility.…”

Section: Introductionmentioning

confidence: 99%

A three-phase off-line UPS system for transformer coupled loads

Bukhari

Ayub

Atiq

2017

IEICE Electron. Express

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A number of critical load applications depend on a UPS system to uphold the normal operation. As soon as any disruption happens on the utility, an off-line UPS system starts supplying the power to the load to prevent blackout. Nonetheless, during this process, a substantial inrush current can be observed for the transformer-coupled loads. To avoid this inrush current, we propose an off-line UPS system based on a current regulated voltage source inverter. The inverter of the proposed UPS system uses a current control scheme executed in a stationary frame to regulate the load current and eliminates the likelihood of the inrush current. To endorse the performance of the proposed UPS system, we constructed a small prototype to obtain the experimental results.

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Section: Introductionmentioning

confidence: 99%

A three-phase off-line UPS system for transformer coupled loads

Bukhari

Ayub

Atiq

2017

IEICE Electron. Express

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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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A single-phase on-line UPS system for multiple load transformers

Cited by 2 publications

References 12 publications

A three-phase off-line UPS system for transformer coupled loads

A three-phase off-line UPS system for transformer coupled loads

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

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