A Comparison of Frequency-Dependent Soil Models: Electromagnetic Transient Analysis of Overhead Transmission Lines Using Modal Decomposition

Autor(es)

Pascoalato, Taina Fernanda Garbelim ; de Araujo, Anderson Ricardo Justo ; Leon Colqui, Jaimis Sajid ; Kurokawa, Sergio ; Pissolato Filho, Jose

• Tipo de documento: Artigo Científico
• Fonte: ENERGIES; v. 15, n. 5, p. 31-pg., 2022-03-01.

Resumo

This article investigates the influence of four causal frequency-dependent (FD) soil models and their impact on the responses of a multiphase overhead transmission line (OHTL) with ground wires, generated by a lightning strike. The FD models proposed by Longmire-Smith (LS), Messier (M), Portela (P) and Alipio-Visacro (AV) are considered. The ground-return impedance and admittance matrices are computed with the Nagakawa approach for both frequency-constant and FD soil models. The frequency-domain modal voltages and time-domain transient voltages are assessed in this work. Modal decomposition technique is used to study the attenuation constant, propagation velocity and voltages for each propagation mode. Simulations are carried out in a frequency range of 100 Hz to 10 MHz, for OHTLs with lengths of 1 and 10 km, on soils of 700 and 4000 omega & BULL;m. Simulation results demonstrated that the Portela (P) model has resulted in more significant variation in the ground-return impedance and admittance, constant attenuation and propagation velocity in which a pronounced variation, especially at the high frequencies, is seen. On the other hand, Longmire-Smith (LS) and Messier (M) have produced similar results in both frequency and time domains. Additionally, the Alipio-Visacro (AV) model has produced intermediate responses, being the model recommended by CIGRE WG C4.33. Time-domain induced voltage waveforms obtained with the Portela (P) model has shown pronounced differences, especially at the peak values, for the high-resistive soil. This study demonstrates the importance of considering the FD soil models to assess the transient responses adequately, especially when OHTLs are on high-resistive soils. (AU)

• Processo FAPESP: 21/06157-5 - Estudo estatístico das sobretensões transitórias em sistemas de potência: modelagem de linhas de transmissão de EAT e sistemas de aterramento em solos com parâmetros variáveis com a frequência
• Beneficiário: Jaimis Sajid Leon Colqui
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 20/10141-4 - Influência das características eletromagnéticas do solo nas respostas transitórias que ocorrem em linhas de transmissão de energia elétrica
• Beneficiário: Tainá Fernanda Garbelim Pascoalato
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 19/01396-1 - Representação de torres convencionais e elevadas de linhas de transmissão diretamente no domínio do tempo para análises de transitórios eletromagnéticos
• Beneficiário: Anderson Ricardo Justo de Araújo
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado