SciELO - Scientific Electronic Library Online

 
vol.44 número2Metodología para Determinar la Distribución de Corrientes de Desbalance en Líneas Aéreas de Transmisión de Energía EléctricaEvaluación de OPS para la Reducción de la PAPR en un Sistema OFDM con Canal Multitrayecto índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Journal

Artigo

Indicadores

Links relacionados

  • Não possue artigos similaresSimilares em SciELO

Compartilhar


Revista Politécnica

versão On-line ISSN 2477-8990versão impressa ISSN 1390-0129

Resumo

CUASAPAZ, Oscar et al. Sequence Impedance Parameter Estimation of a Three-Phase Transformer using Nonlinear Optimization Methods. Rev Politéc. (Quito) [online]. 2019, vol.44, n.2, pp.25-34. ISSN 2477-8990.  https://doi.org/10.33333/rp.vol44n2.03.

This document presents the estimation of the positive, negative, and zero-sequence impedances of a three-phase, 50 kVA, 6300 - 231/133 V transformer. Simulated short-circuit current measurements of single line-to-ground (SLG) and double line-to-ground (LLG) faults are fitted to their respective field measurements using non-linear optimization methods in MATLAB-Simulink. First, laboratory tests are performed on a laboratory-scale three-phase transformer using international standards to determine the sequence parameters. These values constitute the initial values to be used in the estimation stage. Subsequently, SLG and LLG short circuit events were performed where current data were recorded with the help of an oscilloscope. The recorded field data is compared against their simulated counterpart, generating two curves that overlap and have certain differences between them. To adjust the simulated curves with respect to the field measurements, the MATLAB-Simulink “Parameter Estimation” tool was used. This tool allows adjusting the sequence parameters of the model until the difference between the simulated and field values are minimized. Once the method was tested, the sequence parameters of the 50-kVA transformer were obtained following a similar procedure with the only difference that the high voltage side was fed with 500 V due to the physical conditions of the laboratory.

Palavras-chave : short-circuits in power transformers; parameter estimation; non-linear optimization; power transformer parameters; power transformer parameter estimation.

        · resumo em Espanhol     · texto em Espanhol     · Espanhol ( pdf )