A Reconfigurable Uninterruptible Power Supply System for Multiple Power Quality Applications

Yeh, Chia-Chou; Manjrekar, Madhav

doi:10.1109/tpel.2007.900486

Cited by 66 publications

(45 citation statements)

References 25 publications

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“…The total power capacity for the proposed UPS system is about 110% of the rated load power [4]. Since the developed system consists of a single inverter with low power capacity, it is inexpensive and has a small size and weight when compared to conventional double converter-based line-interactive UPS technologies.…”

Section: Basic Operating Principlementioning

confidence: 99%

“…The holdup time of a UPS system against instability is utterly dependent on the rating of the load and the energy storing capability of the UPS setup. On the basis of configuration and operating principles, UPS systems are mainly categorized into three major types: 1) offline, 2) online, and 3) line-interactive [3,4]. However, line-interactive UPS systems can be further categorized into two topologies: 1) single converter-based topology and 2) double converter-based topology.…”

Section: Introductionmentioning

confidence: 99%

“…However, the installation also works as an inverter to supply backup power under abnormal utility power conditions. For the isolation of load, a common approach is to install a high leakage inductance series transformer between the utility and load [4,5]. Conversely, it increases the overall size of the system.…”

Section: Introductionmentioning

confidence: 99%

“…This interval mainly depends on the time required for fault detection and the operating mechanism of the bypass switches [4,6]. During this load transition time interval, a coupled transformer, is likely to be exposed to a faulty/distorted utility voltage, thereby producing a flux offset for the load transformer.…”

Section: Introductionmentioning

confidence: 99%

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A Cost-Effective, Single-Phase Line-Interactive UPS System that Eliminates Inrush Current Phenomenon for Transformer-Coupled Loads

Bukhari¹,

Atiq²,

Lipo³

et al. 2016

Journal of Electrical Engineering and Technology

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-Sudden voltage drops and outages frequently disturb the operation of sensitive loads for domestic, commercial, and industrial use. In some cases, these events may even impair the functioning of relevant equipment. To maintain power under such conditions, a UPS system is usually installed. Once a disturbance happens at the grid side, the line-interactive UPS system takes over the load to prevent an interruption. But, due to magnetic saturation of the transformer, a significant inrush current may occur for the transformer-coupled loads during this transition. The generation of such transient currents may in turn decrease the line voltage and activates over-current protecting devices of the system. In this work, a cost-effective, line-interactive UPS system is proposed that eliminates the inrush current phenomenon associated with transformer-coupled loads. The strategy was implemented by connecting a standard current-regulated voltage source inverter (CRVSI) to the secondary winding of the load transformer. During any transient condition at the grid side, the load current is monitored and regulated to achieve either seamless compensation of the load current or complete transferal of load from grid to the inverter. Experimental results were obtained for a prototype under all possible operating conditions so as to validate the performance of the proposed topology.

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Section: Basic Operating Principlementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Cost-Effective, Single-Phase Line-Interactive UPS System that Eliminates Inrush Current Phenomenon for Transformer-Coupled Loads

Bukhari¹,

Atiq²,

Lipo³

et al. 2016

Journal of Electrical Engineering and Technology

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show abstract

“…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. The transference time of load depends on several factors including the time of the fault detection and the maneuver of switches [3,4]. Although this span of time does not disrupt majority of the applications, it can cause severe problems by generating a large-magnitude inrush current for the transformer-coupled sensitive loads [5].…”

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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