Banca de QUALIFICAÇÃO: Caio Muller Santos Ribeiro

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : Caio Muller Santos Ribeiro
DATE: 27/12/2022
TIME: 14:00
LOCAL: Virtual
TITLE:

Traveling Wave Mathematical Study for Fault Location Applications on HVDC Transmission Lines

KEY WORDS:

Electromagnetic transients, fault location, HVDC transmission lines, power systems, traveling waves.

PAGES: 97
BIG AREA: Engenharias
AREA: Engenharia Elétrica
SUBÁREA: Sistemas Elétricos de Potência
SPECIALTY: Medição, Controle, Correção e Proteção de Sistemas Elétricos de Potência
SUMMARY:

In this PhD qualifying thesis, a mathematical study of traveling wave (TW) phenomenon for fault location applications in high voltage direct current (HVDC) transmission lines is presented. A literature review of the state of the art of fault location methods based on traveling wave theory is carried out. From this review, it is concluded that each method is affected by at least one of four sources of errors and/or practical application challenges, these being the dependence of: data synchronization, line electrical parameters, zero mode quantities, and the detection of the fault-reflected TW. Aiming to find solutions that overcome such difficulties, analytical formulas are presented that aim to represent the traveling waves launched by short circuits and the changes in amplitude and polarity that occur in the discontinuities of the transmission line, for instance, at the fault point and at the termination of the system. These formulas are obtained as a function of the electrical parameters of the transmission line (zero and positive sequence surge impedance) and the short-circuit conditions (fault resistance and prefault voltages). The mathematical expressions is evaluated by means of faults in a benchmark model of the Brazilian National Committee for Production and Transmission of Electric Energy (CIGRE) that represents the Brazilian bipolar high voltage system in direct current of the Madeira River using the Alternative Transients Program (ATP). From the performed analyses, it was observed that the fault-transmitted TW has particular features of amplitude and polarity that make it stand out from the others. Therefore, it is proposed that its can eliminate the sources of errors and practical difficulties in the application of fault location methods found in the literature. Thus, the proposed method will not require additional sensors beyond those available in the HVDC system. Therefore, the solution can easily be applied in the field to complement fault location solutions that are already in use.

BANKING MEMBERS:
Externo à Instituição - FLAVIO BEZERRA COSTA
Interno - 404862 - FRANCISCO DAMASCENO FREITAS
Externo à Instituição - JOSE CARLOS DE MELO VIEIRA JUNIOR - USP
Presidente - 1640512 - KLEBER MELO E SILVA