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Enhancement of the Modal Transformation routine for time-domain models using real constant transformation matrices

Grant number: 17/08486-0
Support Opportunities:Scholarships abroad - Research Internship - Doctorate
Effective date (Start): July 15, 2017
Effective date (End): July 14, 2018
Field of knowledge:Engineering - Electrical Engineering - Power Systems
Principal Investigator:Sérgio Kurokawa
Grantee:Pablo Torrez Caballero
Supervisor: Behzad Kordi
Host Institution: Faculdade de Engenharia (FEIS). Universidade Estadual Paulista (UNESP). Campus de Ilha Solteira. Ilha Solteira , SP, Brazil
Research place: University of Manitoba, Canada  
Associated to the scholarship:14/17051-0 - Inclusion of the frequency effect on the Bergeron Model: representation of the short and long transmission lines taking into account electromagnetic transients resulting from switching operations and lightning, BP.DR


This project proposes the research internship of the student Pablo Torrez Caballero at the University of Manitoba, Winnipeg, Canada under the supervision of the Prof. Kordi. The main research of the beneficiary is to develop a transmission line model for short and long lines under fast and slow transients. The proposed model, in essence, combines the Bergeron method, the modal transformation and uses equivalent circuits to represent frequency dependent parameters. Modal transformation decouples multi-phase lines into uncoupled modes so they can be modeled as single-phase lines. In order to perform this transformation in the time-domain, real constant transformation matrices are needed, such as Clarke's matrix. Clarke's matrix produces good results for short and long transmission lines under slow transients but it causes some error when fast transients are involved. An alternative routine that was developed by Prof. Costa, Prof. Kurokawa and Prof. Kordi was implemented to reduce the error associated to Clarke's transformation. In this routine the modes are generated using the frequency dependent transformation matrices whereas voltages and currents are transformed using Clarke's matrix. However, some deviation is still present. Therefore, the motivation of this research internship is to further enhance the time-domain modal transformation procedure. As a result, the error due to the usage of constant transformation matrices will be greatly reduced. By reducing the error associated to modal transformation applied directly in the time-domain, the main model of the research will be greatly improved, as well as other time-domain models in technical literature. Furthermore, this research internship will provide other benefits for the research group at FEIS/UNESP such as new research topics, exchange of knowledge and will also strengthen the relationship between both groups.

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Scientific publications
(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)
COLQUI, JAMIS S. L.; DE ARAUJO, ANDERSON R. J.; CABALLERO, PABLO T.; KUROKAWA, SERGIO. Alternative method using recursive convolution for electromagnetic transient analysis in balanced overhead transmission lines. IET Science Measurement & Technology, v. 14, n. 7, p. 800-807, . (14/17051-0, 17/08486-0)
CABALLERO, PABLO TORREZ; KUROKAWA, SERGIO; KORDI, BEHZAD. Accelerated frequency-dependent method of characteristics for the simulation of multiconductor transmission lines in the time domain. Electric Power Systems Research, v. 168, p. 55-66, . (14/17051-0, 17/08486-0)

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