Hybrid Transformer Model for Transient Simulation—Part I: Development and Parameters

Mork, B.A.; González, Francisco; Ishchenko, Dmitry; Stuehm, D. L.; Mitra, Joydeep

doi:10.1109/tpwrd.2006.883000

Cited by 127 publications

(64 citation statements)

References 8 publications

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“…one hybrid transformer XFMR is used with SG, that is, 22/400 kV; the second XFMR is used with a PV generator on the ac side, that is, 0.44/400 kV (the interim mediumvoltage systems through which the PV is fed to get to 400 kV are not mentioned in Figure 2); and the third XFMR [34] is used with IG, that is, 34/400 kV. All parameters are available in [35].…”

Section: Wind/pv Grid-connected Systemmentioning

confidence: 99%

Effect of Neutral Grounding Protection Methods for Compensated Wind/PV Grid-Connected Hybrid Power Systems

Çetinkaya

Umer

2017

International Journal of Photoenergy

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The effects of the wind/PV grid-connected system (GCS) can be categorized as technical, environmental, and economic impacts. It has a vital impact for improving the voltage in the power systems; however, it has some negative effects such as interfacing and fault clearing. This paper discusses different grounding methods for fault protection of High-voltage (HV) power systems. Influences of these grounding methods for various fault characteristics on wind/PV GCSs are discussed. Simulation models are implemented in the Alternative Transient Program (ATP) version of the Electromagnetic Transient Program (EMTP). The models allow for different fault factors and grounding methods. Results are obtained to evaluate the impact of each grounding method on the 3-phase short-circuit fault (SCF), double-line-to-ground (DLG) fault, and single-line-to-ground (SLG) fault features. Solid, resistance, and Petersen coil grounding are compared for different faults on wind/PV GCSs. Transient overcurrent and overvoltage waveforms are used to describe the fault case. This paper is intended as a guide to engineers in selecting adequate grounding and ground fault protection schemes for HV, for evaluating existing wind/PV GCSs to minimize the damage of the system components from faults. This research presents the contribution of wind/PV generators and their comparison with the conventional system alone.

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Section: Wind/pv Grid-connected Systemmentioning

confidence: 99%

Effect of Neutral Grounding Protection Methods for Compensated Wind/PV Grid-Connected Hybrid Power Systems

Çetinkaya

Umer

2017

International Journal of Photoenergy

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“…Sin embargo ningún modelo está en capacidad de modelar todos los fenómenos transitorios para todo el espectro de frecuencias posible. Mork et al (2007)señalan que los rangos de frecuencia se pueden clasificar en cuatro grupos con algún grado de traslape entre ellos, tal y como lo muestra en el Cuadro 1.…”

Section: Dependencia Frecuencial En El Modelo De Transformadores De Punclassified

“…Por otro lado, los programas de tipo EMTP como el ATP (Dután, 2010)tienen, en general, dos formas de manejar los datos de tensión eficaz y corriente eficaz, obtenidos a partir de las pruebas, para convertirlos en una curva característica de flujo vs corriente (λ pico ,I pico ), ya sea empleando rutinas de cálculo de parámetros de transformadores, tales como SATURA (Mork, Gonzalez, & Ishchenko, 2007), o mediante métodos más avanzados que pueden tomar en cuenta el acoplamiento trifásico de transformadores (Narang & Brierley, 1994).…”

Section: Dependencia Frecuencial En El Modelo De Transformadores De Punclassified

“…Estos pueden ser provocados por causas externas a la red eléctrica (descargas atmosféricas) o por causas internas (energización de líneas de transmisión).Este tipo de programas permiten el desarrollo de simulaciones y análisis de transitorios electromagnéticos para coordinación de protecciones, coordinación de aislamiento, diseño y dimensionamiento de redes de alta y media tensión, entre otros. Mork et al (2007).…”

Section: Emtp: Programa De Simulación De Transitorios Electromagnéticosunclassified

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Modelo De Transformadores en Saturación Utilizando Funciones De Cálculo De Parámetros en Emtp-Rv

Lobo

2014

Ingeniería

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ResumenLa representación del fenómeno de saturación de un transformador es imprescindible en los estudios de transitorios electromagnéticos, principalmente porque debe representar con exactitud la sobrexcitación del transformador durante su energización, además de ser fundamental para estudiar casos de ferroresonancia (por ejemplo). En general, durante las pruebas de vacío que se aplican al transformador, se determina la corriente de excitación que circula por el núcleo ferromagnético a una determinada tensión. Sin embargo, cuando no exciten datos del fabricante con la curva de saturación del transformador, o las compañías eléctricas no tienen el equipo necesario para realizar este tipo de pruebas, es necesario utilizar otras alternativas. El presente documento hace una revisión de las funciones que se utilizan en el cálculo de parámetros para el modelado del transformador (incluyendo saturación), a partir de pruebas en campo. Estos modelos se encuentran presentes en la librería de elementos del programa de simulación de transitorios electromagnéticos EMTP-RV. Palabras claves: ATP, BCTRAN, EMTP-RV, ferroresonancia, transformadores, transitorios electromagnéticos. AbstractThe representation of the saturation phenomena in transformers is mandatory in electromagnetic transient analysis because it must accurately represent the transformer's over-excitation during energizing process, and being fundamental for ferroresonance analysis. In general, during transformer's open circuit test, the excitation current flowing through the ferromagnetic core for a certain voltage is calculated. Nonetheless, when manufacturers do not provide saturation curves or utilities do not have the necessary equipment to perform this test, it is necessary to use other alternatives. This paper reviews the data calculation functions used in order to model the transformer (including saturation), from field tests. These models are presented in the common library of the electromagnetic transient simulation program EMTP-RV.

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“…3 However, given the disturbance or switching operations in the power system, the power transformer may work under non-sinusoidal magnetization conditions, such as ferroresonance. 4 Ferroresonance is a special case of the resonance phenomenon. 5,6 It can occur in the electrical circuit, which includes a capacitor that resonates with a nonlinear inductance.…”

Section: Introductionmentioning

confidence: 99%

Modeling of grain-oriented Si-steel and amorphous alloy iron core under ferroresonance using Jiles–Atherton hysteresis method

et al. 2017

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Amorphous alloy is increasingly widely used in the iron core of power transformer due to its excellent low loss performance. However, its potential harm to the power system is not fully studied during the electromagnetic transients of the transformer. This study develops a simulation model to analyze the effect of transformer iron core materials on ferroresonance. The model is based on the transformer π equivalent circuit. The flux linkage–current (ψ–i) Jiles–Atherton reactor is developed in an Electromagnetic Transients Program-Alternative Transients Program and is used to represent the magnetizing branches of the transformer model. Two ferroresonance cases are studied to compare the performance of grain-oriented Si-steel and amorphous alloy cores. The ferroresonance overvoltage and overcurrent are discussed under different system parameters. Results show that amorphous alloy transformer generates higher voltage and current than those of grain-oriented Si-steel transformer and significantly harms the power system safety.

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Hybrid Transformer Model for Transient Simulation—Part I: Development and Parameters

Cited by 127 publications

References 8 publications

Effect of Neutral Grounding Protection Methods for Compensated Wind/PV Grid-Connected Hybrid Power Systems

Effect of Neutral Grounding Protection Methods for Compensated Wind/PV Grid-Connected Hybrid Power Systems

Modelo De Transformadores en Saturación Utilizando Funciones De Cálculo De Parámetros en Emtp-Rv

Modeling of grain-oriented Si-steel and amorphous alloy iron core under ferroresonance using Jiles–Atherton hysteresis method

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