Measurement System for Transformer Inrush Current Higher Harmonics Determination

This paper addresses the black start of medium voltage distribution networks (MV-DNs) by a battery energy storage system (BESS). The BESS consists of a two-level voltage source inverter interfacing MV-DN which has limited overcurrent capability. On the other hand, MV-DN normally includes several step-up and step-down transformers that are drawing sympathetic inrush current in energizing stage. Therefore, the major difficulty to perform black start by BESS during MV-DN island operation lies in the fact that the inverter has to simultaneous control the network voltage and its output current. This paper presents two control approaches for a BESS in order to control the inrush current during MV-DN black start. The proposed control schemes consist of droop, voltage and current loops in the stationary reference frame. The droop loop is used to generate the voltage reference. An intermediate voltage and inner current loops are designed for output voltage regulation, current reference generation as well as current tracking, respectively. New reference modifiers are included into droop and voltage loops to limit inrush current. The proposed control schemes are experimentally tested for energizing Ingå MV-DN in Finland by 1 MVA BESS, and their performance is compared in terms of inrush current value and voltage quality. The obtained results prove that both methods are able to feed the load with a fixed voltage in the steady-state as well as to limit the transformer inrush current considering the inverter overcurrent limit.

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“…Subscripts o and T remark the inverter and the transformer. The angle θT is described by the following relationship [23], [24]:…”

Section: B System Modelmentioning

confidence: 99%

Inrush Current Management During Medium Voltage Microgrid Black Start With Battery Energy Storage System

et al. 2022

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“…In that case, along Eqs. ( 16), ( 17), ( 19) and (20), additional equation which enabled determining parameters of the RLC branch is:…”

Section: Dimensioning Of Passive Filtersmentioning

confidence: 99%

“…They follow injection of the no non-sinusoidal current based on which they generate current which, when superimposed with harmonic current gives a "clear" sinusoid. More complex configurations enable complete elimination of all disturbances which affect the quality of electric energy [19][20][21][22][23][24].…”

Section: Dimensioning Of Passive Filtersmentioning

confidence: 99%

Analysis of Transitional Occurrences of Low Voltage Welding Transformer

2023

Teh. vjesn.

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The purpose of this paper is to demonstrate and analyse transition events that occur when the loaded transformer is turned on and off within the welding device. The purpose of the welder is to provide a high quality and stable voltage during the ignition of the arc, and often during the ignition of the arc the transformer comes from its no-load state to the work-load state, depending on the diameter of the electrode that the arc melts. The welding currents of the MIG/MAG (Metal Inert/Active Gas) process are not less than 100 A, about 350 A, at a voltage of the arc of 35 V (DC). In this paper, the MATLAB/PSB programme package is used to analyse the no-load inrush currents and the loaded inrush currents of welding transformers. Current and voltage waveforms were recorded on the primary side of the transformer, as well as the harmonic content of the transformer primary currents, with indicator calculation of the current waveform distortion -THDi.

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Increase in losses in a superconducting transformer due to inrush current

Komarzyniec

2015

ELECTROTECHNICAL REVIEW

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Increase in losses in a superconducting transformer due to inrush current Streszczenie. W pewnych okolicznościach, włączeniu nieobciążonego transformatora nadprzewodnikowego do sieci towarzyszyć może prąd włączania o dużej wartości. Na skutek nasycenia rdzenia, pole magnetyczne w kolumnie wielokrotnie przekracza wartość obliczeniową. W efekcie może mieć miejsce przekroczenie krytycznych wartości prądu oraz natężenia pola materiału nadprzewodnikowego, uzwojenia transformatora przechodzą ze stanu nadprzewodzenia do stanu rezystywnego. Wzrost strat przekłada się na wzrost temperatury nadprzewodnika, mogący prowadzić do termicznego uszkodzenia uzwojeń. W pracy poddano analizie wzrost strat w uzwojeniu transformatora HTS na skutek przepływu prądu włączania. Wzrost strat w transformatorze nadprzewodnikowym w skutek przepływu prądu włączania.

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Measurement System for Transformer Inrush Current Higher Harmonics Determination

Cited by 4 publications

References 5 publications

Inrush Current Management During Medium Voltage Microgrid Black Start With Battery Energy Storage System

Inrush Current Management During Medium Voltage Microgrid Black Start With Battery Energy Storage System

Analysis of Transitional Occurrences of Low Voltage Welding Transformer

Increase in losses in a superconducting transformer due to inrush current

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