Wideband Modeling of Large Grounding Systems to Interface With Electromagnetic Transient Solvers

Sheshyekani, Keyhan; Akbari, Mohsen; Tabei, Barzan; Kazemi, Reza

doi:10.1109/tpwrd.2014.2310631

Cited by 37 publications

(21 citation statements)

References 34 publications

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“…Having known the voltage distribution, the failure risk of insulation can be calculated by (8). It is noted that once the probability of failure has been determined, the expected life (E.L.) can be calculated by:…”

Section: Time Domain Simulationmentioning

confidence: 99%

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Probabilistic Assessment of Lightning Related Risk of Transmission Lines Based on Frequency Dependent Modeling of Tower-Footing Grounding System

Gholinejhad¹,

Shariatinasab²,

Sheshyekani³

2018

AEM

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This paper presents a probabilistic evaluation, based on Monte-Carlo method, for the estimation of insulation risk of failure of overhead transmission lines (TLs). The proposed method takes into account the wide-band model of towerfooting grounding system. The wide-band model of grounding system in frequency domain is obtained by the method of moment solution to the governing electrical field integral equations. The electrical parameters of soil are considered to be either constant or frequency dependent. The time-domain representation of the grounding system is inferred through pole-zero characterization of its associated frequency response. The case of a typical 400-kV transmission line is modelled in EMTP_RV with the towerfooting grounding system integrated with the transmission line (TL) system. The results of the paper show that the failure risk of transmission lines is affected by the grounding system model. This effect is more pronounced when the soil electrical parameters are assumed to be frequency dependent.

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Section: Time Domain Simulationmentioning

confidence: 99%

“…In the previous works the grounding system has been modeled with a linear or nonlinear resistor [2][3][4][5]. However, a method has also been presented in [8][9][10] for wide band modelling of grounding systems in the EMTP-like tools. This helps with the accurate calculation of lightning overvoltages.…”

Section: Introductionmentioning

confidence: 99%

Probabilistic Assessment of Lightning Related Risk of Transmission Lines Based on Frequency Dependent Modeling of Tower-Footing Grounding System

Gholinejhad¹,

Shariatinasab²,

Sheshyekani³

2018

AEM

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“…A three-stage methodology, Modified Matrix Pencil Method (Modified-MPM) [19], is designed to incorporate large grounding systems' behavior into electromagnetic transient solvers. The results demonstrated that using the resistive model for the grounding system leads to a significant decrease in the lightning-generated overvoltages' computation.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the High Frequency Behavior of the Modified Grounding Scheme in Wind Farms

et al. 2017

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Wind generators are exposed to numerous destructive forces such as lightning and are therefore vulnerable to these phenomena. To evaluate the transient behavior of a wind power plant during direct and indirect strikes, modeling of all relevant components is required. Among the protective and control components of wind turbines, the grounding system is the most important element for protection against lightning strikes. This paper examines the impact of nonlinear soil ionization behavior and frequency dependency on a wind turbine in order to model a sufficient protection scheme to reduce overvoltage and make the system tolerable against transitions. The high frequency models of other equipment such as transformers, horizontal conductors, vertical rods, surge arresters and underground cables must also be taken into account to design the grounding system. Our Proposed Modified Grounding Scheme (PMGS) is to reduce the maximum transient overvoltages. We simulate the model in a restructured version of the Electromagnetic Transient Program (EMTP-RV) software to examine the effectiveness of the system. We then apply the simulated results to pair of turbines that are interconnected with a frequency-dependent cable. We carry out the simulation for direct and indirect lightning strikes. The results indicate that the MGS can lead to considerably more than a 50% reduction in transient voltages for lightning and thus leads to more reliable networks.

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“…For example, attempts were made to locate and size DG sources in a distribution network to improve voltage profile, loss reduction, and short-circuit level reduction [3][4][5][6]. In order to tackle the protection challenges, a number of methods have been devised, including use of Fault Current Limiters (FCLs) [7], use of adaptive protection schemes according to fault location by a Supervisory Unit Controller Unit (SRCU) [8], and use of multiagent method [9].…”

Section: Introductionmentioning

confidence: 99%

Optimal placement and sizing of distributed generation sources considering network parameters and protection issues

Hosseini

Sadeghi

Abyaneh

et al. 2014

2014 International Conference on Renewable Energy Research and Application (ICRERA)

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We propose a method for optimal placement and sizing of distributed generation (DG) sources in an existing distribution network. The method, which uses the genetic algorithm, provides improved network parameters (i.e., voltage profile, power losses, and short circuit levels) while keeping the existing coordination of protection devices unchanged. An important feature of the proposed method is the accommodations for transient shortcircuit fault currents due to DGs and their connection/disconnection states, thus preventing undesired effects on the coordination of protection devices. To demonstrate the feasibility of the proposed method, we present simulated results for optimal placement of DGs in an existing distribution network.

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Wideband Modeling of Large Grounding Systems to Interface With Electromagnetic Transient Solvers

Cited by 37 publications

References 34 publications

Probabilistic Assessment of Lightning Related Risk of Transmission Lines Based on Frequency Dependent Modeling of Tower-Footing Grounding System

Probabilistic Assessment of Lightning Related Risk of Transmission Lines Based on Frequency Dependent Modeling of Tower-Footing Grounding System

Evaluating the High Frequency Behavior of the Modified Grounding Scheme in Wind Farms

Optimal placement and sizing of distributed generation sources considering network parameters and protection issues

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