The Analysis of the Symmetrical Short-Circuit Currents in Backup Power Supply Systems with Low-Power Synchronous Generators

Mamcarz, Dominik; Albrechtowicz, Paweł; Radwan-Pragłowska, Natalia; Rozegnał, Bartosz

doi:10.3390/en13174474

Cited by 5 publications

(5 citation statements)

References 15 publications

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“…When the short-circuit phenomena occurs in the low-voltage system supplied by the backup generator set, this fault should be recognized by generator as a close. During this fault type, generator states can be highlighted: sub-transient, transient, and steady-state short-circuit as a consequence of phenomena that takes place inside the generator (electromagnetic flux path changes) [21,22]. Depending on the generator construction, short-circuit state values and their time intervals are different [23].…”

Section: The Characteristic Of Low-power Silent Poles Synchronous Generatorsmentioning

confidence: 99%

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The Short-Circuit Protections in Hybrid Systems with Low-Power Synchronous Generators

et al. 2020

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Single-phase short-circuits are most often faults in electrical systems. The analysis of this damage type is taken for backup power supply systems, from small power synchronous generators. For these hybrid installations, there is a need for standard protection devices, such as fuses or miniature circuit breaker (MCB) analysis. Experimental research mentioned that a typical protective apparatus in low-voltage installations, working correctly during supplying from the grid, does not guarantee fast off-switching, while short-circuits occur during supplication from the backup generator set. The analysis of single-phase short-circuits is executed both for current waveform character (including sub-transient and transient states) and the carried energy, to show the problems with the fuses and MCB usage, to protect circuits in installations fed in a hybrid way (from the grid and synchronous generator set).

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Section: The Characteristic Of Low-power Silent Poles Synchronous Generatorsmentioning

confidence: 99%

“…Due to relatively high values of the generators synchronous reactance, the short-circuit current value during steady-state can be even smaller than its rated current (three-phase or three-phase to earth faults). In detail, this issue is described in [21], where the analysis was done.…”

Section: The Characteristic Of Low-power Silent Poles Synchronous Generatorsmentioning

confidence: 99%

The Short-Circuit Protections in Hybrid Systems with Low-Power Synchronous Generators

et al. 2020

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“…The measurement system consisted of current clamps (Fluke ac i1000s-measurement range 100 A, 10 mV/A, accuracy 2% of reading ±5 mV), differential voltage probes (Pintek DP-200pro, measurement range 100:1, accuracy ≤ ±2%), and the data acquisition system built on the NI USB-6259 measuring card and NI LabVIEW Signal Express software in ver. 15.0.0 (National Instruments Corp., Austin, TX, USA) [27,28].…”

Section: Laboratory Setupmentioning

confidence: 99%

The Comparative Analysis of Phase Shifting Transformers

Albrechtowicz

Szczepanik

2021

Energies

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Phase shifting transformers (PSTs) are currently widely used in power systems to control power flow. In this manuscript, the results of the asymmetrical PST (APST) with the in-phase PST (called asymmetrical controllable PST-ACPST) were compared, allowing to control both longitudinal and quadrature voltage. The MATLAB simulation model of the ACPST was built to obtain influence of PST in selected models for selected parameters. Then the 30A laboratory PST device was built in the laboratory. The parameters of the MATLAB model were then adjusted to parameters of the real life PST model. This allowed verifying the results of the real life and computer simulations. Based on the ACPST simulation model, the APST model was built; for the given work conditions, the influence of both PSTs were compared. APST construction always resulted in higher output voltage than the input one. ACPST achieved the same power transfer for the lower output PST voltage, which is its main advantage. This dependency is a result of the greater ACPST angle compared to the classical APST. The ACPST also allowed adjusting longitudinal and quadrature voltages; therefore, this PST type can be installed in places where high flexibility is required, especially in systems with high renewable energy sources penetration.

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“…To measure voltage and current signals, voltage probes were used (Pintek DP-200pro, measurement range 100:1, accuracy ≤ ± 2%) along with current probes (Fluke ac i1000smeasurement range 100 A, 10 mV/A, accuracy 2% of reading ± 5 mV). The signals were collected via an NI measurement card and then analyzed in SignalExpress and Matlab [26,27].…”

Section: Laboratory Pst Constructionmentioning

confidence: 99%

Phase-Shifting Transformer Efficiency Analysis Based on Low-Voltage Laboratory Units

Albrechtowicz

2021

Energies

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Phase-shifting transformers are effective elements used to control power flows in many power systems. Their positive influence on power flows has been proved in the literature. However, the efficiency of phase-shifting transformers has not been analyzed, especially not with regard for their various types. This study is therefore focused on the efficiency question with respect to electrical energy parameters. Research was performed on a laboratory phase-shifter unit with longitudinal and quadrature voltage regulation, and then these results were correlated to the simulation model equivalent. Laboratory transformer parameter data were used to prepare asymmetrical and symmetrical phase-shifting transformer simulation models. Simulation results were then used to compare the electrical properties and efficiency of all the types of phase-shifting transformer considered. All phase-shifting transformer types had a significant impact on the transmitted active power, but each type had different features. The symmetrical unit had the lowest power losses and a stable output voltage level compared to the asymmetrical one, which increased the output voltage, while the quadrature voltage also grew. These features must be considered, taking into account power system conditions such as the voltage variability profile and active power transfer demand. In this study, we propose the construction of an asymmetrical controllable phase-shifting transformer in order to achieve flexible control.

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The Analysis of the Symmetrical Short-Circuit Currents in Backup Power Supply Systems with Low-Power Synchronous Generators

Cited by 5 publications

References 15 publications

The Short-Circuit Protections in Hybrid Systems with Low-Power Synchronous Generators

The Short-Circuit Protections in Hybrid Systems with Low-Power Synchronous Generators

The Comparative Analysis of Phase Shifting Transformers

Phase-Shifting Transformer Efficiency Analysis Based on Low-Voltage Laboratory Units

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