An Inrush Mitigation Technique of Load Transformers for the Series Voltage Sag Compensator

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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“…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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“…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]. In addition it can also cause the impairment of the sensitive load and shorten the life time of the load transformer.…”

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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“…During this time interval, the transformer, which is typically installed before the load for electrical isolation, may be exposed to a deformed grid voltage. Hence, as the compensator reinstates the load voltage, the flux linkage of the isolation transformer may reach the magnetic saturation level and generate a high magnitude of inrush current [1,2]. Such an inrush current results in the failure of load voltage compensation by activating the over-current protection of the compensator, which leads to an interruption for the sensitive load [3,4,5,6].…”

Section: Introductionmentioning

confidence: 99%

A new single-phase sag compensator intended for transformer-coupled loads

Bukhari

Kwon

2016

IEICE Electron. Express

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In this paper we propose a new single-phase sag compensator intended for transformer-coupled loads that integrates a current-controlled inverter in parallel with the secondary winding of an isolation transformer. Compared with conventional single-phase series-voltage sag compensators that produce a high inrush current during the starting of the compensation process, the proposed sag compensator eliminates the inrush current and achieves seamless compensation for the load current. The performance of the proposed sag compensator is validated by our experimental results for a small prototype.

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An Inrush Mitigation Technique of Load Transformers for the Series Voltage Sag Compensator

Cited by 54 publications

References 21 publications

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

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

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

A new single-phase sag compensator intended for transformer-coupled loads

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