Frequency-Dependent Multiconductor Transmission Line Model With Collocated Voltage and Current Propagation

Martí, José; Tavighi, Arash

doi:10.1109/tpwrd.2017.2691343

Cited by 28 publications

(8 citation statements)

References 68 publications

(90 reference statements)

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“…In propagation in overhead lines with ground return, the series impedance per unit length is the sum of the series impedances considering ground as a perfect conductor and of the ground impedance integral [24], which is evaluated in PSCAD through direct numerical integration. Alternatively, the ground impedance integral can be estimated by an analytical approximation [25,26]. If ground is a perfect conductor (ρ ≈ 0 Ω•m), the attenuation is negligible.…”

Section: Discussionmentioning

confidence: 99%

The Half-Sine Method: A New Accurate Location Method Based on Wavelet Transform for Transmission-Line Protection from Single-Ended Measurements

2019

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In this work, a new and accurate method based on the wavelet transform is proposed for fault location in transmission-line systems. The proposed wavelet method consists of the analysis of the transient signal measured at a single end of the transmission line. Aerial current modes are used, and zero modes are included in the fault-detection scheme for low fault-inception angles. The fault distance is evaluated using the wavelet modulus maxima technique and a method based on the response to a half-sine voltage is proposed to overcome drawbacks arising from the limited sampling frequency and low fault-inception angle. The fault distance is calculated using the difference between the time when a 100 kHz half-sine signal is sent and the time when the derivative signal is received. The proposed algorithm is tested considering harmonic distortion and varying fault resistance, ground resistivity, location and inception angle. The high accuracy of the proposed algorithm is obtained even for faults close to the bus and low inception angles.

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Section: Discussionmentioning

confidence: 99%

The Half-Sine Method: A New Accurate Location Method Based on Wavelet Transform for Transmission-Line Protection from Single-Ended Measurements

2019

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“…It should be note that Y c and H are frequency dependent functions. The methods for computing these functions have been described by Marti (1981), Marti et al 2017 andDommel (1985). Traveling wave equations of currents (1e) and (1f) involve matrix relations to 2N c scalar equations, with N c being the number of conductors in the line.…”

Section: Fd-line Equations In the Phase Domainmentioning

confidence: 99%

Implementation of the frequency dependent line model in a real-time power system simulator

2017

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In this paper is described the implementation of the frequency-dependent line model (FD-Line) in a real-time digital power system simulator. The main goal with such development is to describe a general procedure to incorporate new realistic models of power system components in modern real-time simulators based on the Electromagnetic Transients Program (EMTP). In this procedure are described, firstly, the steps to obtain the time domain solution of the differential equations that models the electromagnetic behavior in multi-phase transmission lines with frequency dependent parameters. After, the algorithmic solution of the FD-Line model is implemented in Simulink environment, through an S-function programmed in C language, for running off-line simulations of electromagnetic transients. This implementation allows the free assembling of the FD-Line model with any element of the Power System Blockset library and also, it can be used to build any network topology. The main advantage of having a power network built in Simulink is that can be executed in real-time by means of the commercial eMEGAsim simulator. Finally, several simulation cases are presented to validate the accuracy and the real-time performance of the FD-Line model. Keywords:Real-Time Simulators, EMTP program, frequency-dependent line model, FD-Line, Simulink, power-system blockset. RESUMENEn este artículo se describe la implementación del modelo de línea dependiente de la frecuencia FD-Line en un simulador digital en tiempo-real de sistemas eléctricos de potencia. El objetivo principal con este desarrollo es describir un procedimiento general para incorporar nuevos modelos realistas de componentes de sistemas eléctricos de potencia en los modernos simuladores de tiempo real basados en el programa de transitorios electromagnéticos (o EMTP, por sus siglas en inglés). En dicho procedimiento se describen, primeramente, los pasos para obtener la solución en el dominio del tiempo de las ecuaciones diferenciales que modelan el comportamiento electromagnético de una línea de transmisión polifásica con parámetros dependientes de la frecuencia. Posteriormente, se implementa la solución algorítmica del modelo de línea en Simulink, por medio de una función S en lenguaje C, para ejecutar simulaciones fuera de línea de transitorios electromagnéticos. Esta implementación permite ensamblar libremente el modelo FD-Line con cualquier elemento de la librería de sistemas de potencia en Simulink y también, se puede construir cualquier topología de red eléctrica. La principal ventaja de tener una red eléctrica construida en Simulink es que puede ser ejecutada en tiempo real por medio del simulador comercial eMEGAsim. Finalmente, se presentan varios casos de simulación de sistemas de potencia para probar la precisión y el desempeño en tiempo-real del modelo FD-Line.Palabras clave: Simulador tiempo real, programa EMTP, modelo de línea dependiente de la frecuencia, FD-Line, Simulink, librería de sistemas eléctricos de potencia.

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“…Several studies address the accuracy and efficiency of frequency-dependent TLM based on the modal decoupling of network equations and time-domain modelling using fitting methods [12][13][14][15][16][17]. Currently, most applications of these approaches are limited to the field of transient state estimation and power system protection [18], and therefore a new TLM for complete grid decoupling is worth further study [19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Segmented transmission delay based decoupling for parallel simulation of a distribution network

Wei

Liu

et al. 2021

IET Renewable Power Gen

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The introduction of inverters and power electronic devices increases the amount of calculation needed for electromagnetic transient simulation in distribution networks with a high proportion of distributed generation. Hence, the parallel calculation of electromagnetic transient simulation has become an effective way to improve its efficiency. To realize efficient parallel simulation, a method to decouple transmission lines in the distribution network based on the segmented transmission delay model is proposed, which divides the line into two segments according to different transmission delays. The transmission delay of one segment is an integral multiple of the simulation step used for line decoupling, whereas the other segment is a lumped parameter model, which makes it equivalent to the original line. In addition, an interface for the distribution network based on the segmented transmission delay model is designed and implemented, and the decoupling simulation of a distribution network is performed. Finally, using the simulation examples of IEEE 34 and IEEE 123 node test feeders, the proposed decoupling method is compared with other established methods. It is found to be more accurate and efficient as well as more suitable for the parallel computation of a distribution network simulation than the comparison methods.

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Frequency-Dependent Multiconductor Transmission Line Model With Collocated Voltage and Current Propagation

Cited by 28 publications

References 68 publications

The Half-Sine Method: A New Accurate Location Method Based on Wavelet Transform for Transmission-Line Protection from Single-Ended Measurements

The Half-Sine Method: A New Accurate Location Method Based on Wavelet Transform for Transmission-Line Protection from Single-Ended Measurements

Implementation of the frequency dependent line model in a real-time power system simulator

Segmented transmission delay based decoupling for parallel simulation of a distribution network

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