Digital Simulation of Magnetizing Inrush Currents in Three-Prase Transformers

Rahman, M.A.; Gangopadhyay, A.

doi:10.1109/tpwrd.1986.4308053

Cited by 20 publications

(3 citation statements)

References 7 publications

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“…A mathematical model of a three-phase transformer was developed for the most frequently used type of transformer, the three-legged (European) model in marni namoti spojeni u zvijezdu s nul vodičem [5] i [6]. Sekundar nije potrebno uzimati u obzir jer se opisuje model transformatora u praznom hodu, (otvoren sekundar), što je najnepovoljniji slučaj s gledišta udarnih struja uklopa.…”

Section: Mathematical Model Of the Energization Of A Three-phase Tran...mentioning

confidence: 99%

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Reduction of the Inrush Currents of Three-Phase Power Transformers

Petrović¹,

Kilić²,

Bego³

2022

joe

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Inrush currents that occur during the energization of a three-phase power transformer can reach very high values and cause many problems in an power system. A mathematical model of a transformer has been developed for the investigation of this problem, taking into account the effects of saturation, hysteresis and remanent magnetic flux. An algorithm has been described for the determination of the optimal instant of energization, with the goal of reducing inrush currents. As a method for measuring remanent magnetic flux, integration of the secondary voltage during the previous deenergization is proposed. A circuit model has been prepared of a system for the controlled energization of a three-phase transformer in which the simulation results are confirmed by measurement.

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Section: Mathematical Model Of the Energization Of A Three-phase Tran...mentioning

confidence: 99%

“…which the primary windings are star connected. The star point is conducted to a neutral conductor [5] and [6]. It is not necessary to take the secondary winding into consideration because the transformer model described operates under no load (open secondary), which is the worst-case scenario from the viewpoint of inrush currents.…”

Section: Naponske Jednadžbementioning

confidence: 99%

Reduction of the Inrush Currents of Three-Phase Power Transformers

Petrović¹,

Kilić²,

Bego³

2022

joe

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“…For more than 100 years, these transformer inrush currents have caused some difficulties, such as the malfunction of protective relays and power quality reduction of the network [17,60]. Hence, knowledge of transformers behavior under normal operation and transient cases is a requirement for the reliable and stable performance of transformers protection devices [61,62]. Thus, the possibility of achieving this knowledge could be provided by transformer modeling which is a vast topic.…”

Section: Introductionmentioning

confidence: 99%

Operation of HVDC converters for transformer inrush current reduction

Joukhah¹

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The present PhD thesis deals with transformer inrush current in offshore grids including offshore wind farms and High Voltage Direct Current (HVDC) transmission systems. The inrush phenomenon during transformers energization or recovery after the fault clearance is one of important concerns in offshore systems which can threaten the security and reliability of the HVDC grid operation as well as the wind farms function. Hence, the behaviour of wind turbines,Voltage Source Converters (VSC) and transformer under the normal operation and the inrush transient mode is analyzed. For inrush current reduction in the procedure of the offshore wind farms start-up and integration into the onshore AC grid, a technique based on Voltage Ramping Strategy (VRS) is proposed and its performance is compared with the operation of system without consideration of this approach. The new methodology which is simple, cost-effective ensures minimization of transformer inrush current in the offshore systems and the enhancement of power quality and the reliability of grid under the transformer energizing condition. The mentioned method can develop much lower inrush currents according to the slower voltage ramp slopes. Concerning the recovery inrush current, the operation of the offshore grid especially transformers is analyzed under the fault and the system restoration modes.The recovery inrush transient of transformers can cause tripping the HVDC and wind farms converters as well as disturbing the HVDC power transmission. A voltage control design based on VRS is proposed in HVDC converter to recover ali the transformers in offshore grid with lower inrush currents.The control system proposed can assure the correct performance of the converters in HVDC system and in wind farm and also the robust stability of the offshore grid. Esta tesis doctoral estudia las corrientes de energización de transformadores de parques eólicos marinos con aerogeneradores con convertidores en fuente de tensión (VSC) de plena potencia conectados a través de una conexión de Alta Tensión en Corriente Continua (HVDC). Las corrientes de energización pueden disminuir la fiabilidad de la transmisión eléctrica debido a disparos intempestivos de las protecciones durante la puesta en marcha o recuperación de una falta. Para la mitigación de las corrientes de energización durante la puesta en marcha del parque esta tesis propone una nueva estrategia basada en incrementar la tensión aplicada por el convertidor del parque eólico en forma de rampa (VRS). Este método persigue energizar el parque eólico con el menor coste y máxima fiabilidad. La tesis analiza diferentes escenarios y diferentes rampas. Otro momento en que las corrientes de energización pueden dar lugar a un disparo intempestivo de las protecciones es durante la recuperación de una falta en la red de alterna del parque eólico marino. Esta tesis extiende la estrategia VRS, utilizada durante la puesta en marcha del convertidor del parque, para los escenarios de recuperación de una falta.

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Compensation for magnetizing inrush currents in transformers using a PWM inverter

Shinohara

Yamamoto

Iimori

et al. 2002

Electrical Engineering Japan

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SUMMARYWhen a transformer is connected to a circuit, under certain conditions, magnetizing inrush currents may be about ten times the full load current of the transformer. The currents contain a large amount of harmonic components and cause some relays to trip out. In this paper, the magnetizing inrush currents are compensated using a PWM inverter. The magnetizing inrush currents are detected and the PWM inverter generates compensating currents for the inrush currents. Hysteresis current controllers are used for fast response. The validity of this compensation is investigated by the simulation results. In addition, hardware implementation for the compensator is accomplished to verify the simulation results. Moreover, for the compensator, the relation between the compensating characteristics, the maximum switching frequency, and the coupling reactor is discussed based on the simulation results. Finally, characteristics of two current controllers (hysteresis band current controller and ramp-comparison controller) are compared and it is shown that the hysteresis band current controller is more suitable for the compensator. The PSCAD/EMTDC electromagnetic transient simulator is used for the simulations.

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Digital Simulation of Magnetizing Inrush Currents in Three-Prase Transformers

Cited by 20 publications

References 7 publications

Reduction of the Inrush Currents of Three-Phase Power Transformers

Reduction of the Inrush Currents of Three-Phase Power Transformers

Operation of HVDC converters for transformer inrush current reduction

Compensation for magnetizing inrush currents in transformers using a PWM inverter

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