Study of transient overvoltages in underground and submarine transmission lines considering rigorous models for calculating ground-return parameters

• Grant number: 23/05066-1
• Support Opportunities: Scholarships in Brazil - Master
• Start date: August 01, 2023
• Status: Discontinued
• Field of knowledge: Engineering - Electrical Engineering - Power Systems
• Principal Investigator: Jose Pissolato Filho
• Grantee: Jesus Enrique Guevara Asorza
• Host Institution: Faculdade de Engenharia Elétrica e de Computação (FEEC). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
• Associated scholarship(s): 24/14472-6 - Lightning study in mixed overhead-underground transmission lines using rigorous formulations for computing earth-return parameters., BE.EP.MS

Abstract

Underground and Submarine Transmission Lines (LTS) are presented as necessary alternatives for the expansion of the transmission system in some scenarios, such as, for example, urban regions with high population density, environmental protection areas, water crossings, high voltage connections direct current, and alternating current with offshore wind farms, among other scenarios, in which the implementation of Overhead Transmission Lines (LTA) is extremely complex and even impossible. Therefore, solutions considering LTS have been increasingly recommended by planning. In fact, cargo service in some cities and regions, not restricted to the largest metropolises, has only been made possible through solutions that include stretches of lines or even mixed, underground, and/or submarine lines.In this context, it is of crucial importance to have rigorous and precise electromagnetic models of the LTS that allow us to calculate and fulfill the design requirements, both in permanent and transient regimes. Usually, studies of transient overvoltages in transmission systems, including LTS and LTA, are carried out using EMTP®-type programs, such as, for example, ATP®, PSCAD®, and EMTP-RV®, which adopt some assumptions that can lead to inaccurate results, especially when calculating overvoltages due to lightning strikes. These assumptions are mainly due to the fact that these programs often adopt Pollaczek's formula to calculate ground return impedance and admittance without considering displacement currents. Furthermore, in these programs, the grounding of the cable shields is considered frequency-independent, and these are frequency-dependent. However, recent studies show that these considerations often lead to inaccuracies in transient studies on underground cables in the frequency ranges from kHz to MHz. Therefore, this master's project will present and consider the ground return impedance and admittance, as well as all elements of the LTS and LTA, dependent on the frequency for the study of electromagnetic transients.

Scientific publications

(5)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

ASORZA, JESUS E. GUEVARA; COLQUI, JAIMIS S. L.; PISSOLATO FILHO, JOSE; DA SILVA, FILIPE FARIA; BAK, CLAUS LETH. Analysis of induced voltage on the sheath in multi-circuit systems within renewable energy parks. Electric Power Systems Research, v. 238, p. 12-pg., 2024-10-15. (23/05066-1, 23/11009-0)

ASORZA, JESUS E. GUEVARA; COLQUI, JAIMIS S. L.; DA SILVA, FILIPE FARIA; PISSOLATO FILHO, JOSE. Earth continuity conductor location in single-circuit underground transmission line using the generalized model. Electric Power Systems Research, v. 235, p. 11-pg., 2024-07-17. (23/05066-1, 23/11009-0)

ASORZA, JESUS E. GUEVARA; COLQUI, JAIMIS S. L.; FILHO, JOSE PISSOLATO. Analysis of overvoltage and backflashover of an unified double-circuit OHTL-A case study. Electric Power Systems Research, v. 236, p. 11-pg., 2024-07-26. (21/06157-5, 23/05066-1, 23/11009-0)

GUEVARA, JESUS E.; FLORES RUIZ, WILLIAM GONZALO; LEON COLQUI, JAIMIS SAJID. Evaluation of Mixed Systems for Sheath Bonding of Single-Circuit Underground Power Lines. SOUTHEASTCON 2024, v. N/A, p. 6-pg., 2024-01-01. (21/06157-5, 23/05066-1, 23/11009-0)

GUEVARA, JESUS E.; COLQUI, JAIMIS S. L.; PISSOLATO FILHO, JOSE. Analysis of Overvoltage and Backflashover with Different Transmission Line Models. SOUTHEASTCON 2024, v. N/A, p. 6-pg., 2024-01-01. (21/06157-5, 23/05066-1, 23/11009-0)