Short-Circuit Fault Analysis of the Sen Transformer Using Phase Coordinate Model

Liang Bu, Song Han and Jinling Feng
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Liang Bu: Department of Electrical Engineering, Guizhou University, Guiyang 550025, China
Song Han: Department of Electrical Engineering, Guizhou University, Guiyang 550025, China
Jinling Feng: Department of Electrical Engineering, Guizhou University, Guiyang 550025, China

Energies, 2021, vol. 14, issue 18, 1-19

Abstract: The Sen Transformer (ST) provides an economical solution for power flow control and voltage regulation. However, fault analysis and evaluation of the performance of the transmission protection system in the presence of a ST have not been investigated. Hence, a short-circuit model of the ST using the phase coordinate method is proposed in this paper. Firstly, according to the coupled-circuit ST model, the nodal admittance matrix between the sending end and receiving end of the ST was deduced. Subsequently, a fully decoupled mathematical model was established that can reflect three characteristics, including its winding connection structure, electrical parameters, and ground impedance. Thus, with the help of the phase-coordinate-based solving methodology, a short-circuit ST model may be built for various short-circuit faults. The MATLAB and PSCAD/EMTDC software were employed to carry out simulated analyses for an equivalent two-bus system. The short-circuit currents obtained from the time-domain simulation and the analytic calculation utilizing the proposed model reached an acceptable agreement, confirming the simulation’s effectiveness. Moreover, the variation of the fault currents with the variation of the compensating voltage after single-phase-to-ground and three-phase short-circuit faults was demonstrated and used to analyze the effect of the ST on the fault currents.

Keywords: decoupled mathematical model; nodal admittance matrix; phase coordinate method; Sen Transformer; short-circuit fault analysis (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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