An Inrush Current Mitigation Technique for the Line-Interactive Uninterruptible Power Supply Systems

Chen, Yu-Hsing; Cheng, Po-Tai

doi:10.1109/08ias.2008.324

Cited by 8 publications

(9 citation statements)

References 18 publications

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“…Hence, as soon as the UPS system takes over the load and reinstates its rated voltage, the transformer flux may rise above its saturation level and generate a substantial inrush transient current. The size of this transient current can attain a peak that is 2-6 times the rated load current depending on the nature of the fault at the utility side, the load transition time interval for the UPS system, and the magnetic properties of the load transformer [1,7]. Possible consequences of the inrush current include a decreased voltage and triggering of the over-current protecting devices of the UPS system, which could in turn lead to failure of the backup power.…”

Section: Introductionmentioning

confidence: 99%

“…Resistors or reactors could be inserted during the load transition process, but this will increase the overall size of the system since large power panels are required to accommodate the resistors, reactors, and electromechanical switches. A flux offset compensation method can also be adopted to control the flux of the load transformer [1]. However, even with a complex control strategy, the phenomenon of inrush current will persist, albeit with a reduced magnitude.…”

Section: Introductionmentioning

confidence: 99%

“…Sudden voltage drops and outages, can interrupt the operation of critical load applications leading to the impairment of relevant equipment [1]. To address this issue and supply unpolluted and continuous power to sensitive loads during irregular utility power circumstances, a UPS system is usually installed [2].…”

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: Introductionmentioning

confidence: 99%

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

View full text Add to dashboard Cite

show abstract

“…It is because of the fact that during this time, a flux offset is usually established, and as a consequence the load transformer installed before the load for isolation, goes into the saturation and starts drawing very large inrush currents. The size of such inrush current depends on some factors such as the switching instant and the magnetic properties of the load transformer [6]. Potential outcomes of the inrush current are the reduced line voltages and activation of a UPS system's protection devices [7,8].…”

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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“…Actively regulating the transformer flux is the most recently adopted technique. However, it involves complex control algorithms [2,3,4,5,6,7,8].…”

Section: Introductionmentioning

confidence: 99%

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

Bukhari

Kwon

2017

IEICE Electron. Express

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Numerous loads require the installation of load transformers for electrical isolation or voltage matching. When these loads are powered by a single-phase on-line UPS system, a high magnitude of transient inrush current is often observed due to the energizing of the load transformer. In this paper, we propose a novel single-phase on-line UPS system that eliminates the generation of inrush current while powering multiple load transformers. The performance of the proposed single-phase UPS system is endorsed by our experimental results obtained using a small laboratory-sized prototype. Keywords: on-line UPS system, multiple load transformers, inrush current, current-controlled inverter Classification: Circuits and modules for electronic instrumentation References[1] C.-M. Lai: "A battery-powered single-stage three-phase high step-up converter topology for micro DC-UPS," IEICE Electron. Express 11

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An Inrush Current Mitigation Technique for the Line-Interactive Uninterruptible Power Supply Systems

Cited by 8 publications

References 18 publications

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

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

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

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

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