Leg Conversion Method for the Continuous Control of a Railway Vehicle Propulsion Inverter

Jongyong Choi, Gildong Kim, Hyunjae Lee, Gunbok Lee and Jingeun Shon ()
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Jongyong Choi: Department of Electrical Engineering, Gachon University, Seongnam-si 13120, Republic of Korea
Gildong Kim: Korea Railroad Research Institute, Uiwang-si 16105, Republic of Korea
Hyunjae Lee: Department of Electrical Engineering, Gachon University, Seongnam-si 13120, Republic of Korea
Gunbok Lee: Korea Railroad Research Institute, Uiwang-si 16105, Republic of Korea
Jingeun Shon: Department of Electrical Engineering, Gachon University, Seongnam-si 13120, Republic of Korea

Energies, 2023, vol. 16, issue 14, 1-13

Abstract: In this study, we propose a whole-leg scheme for the continuous control of a railway vehicle propulsion inverter. The three-leg method is commonly used to obtain the output AC power from the input DC voltage in a railway vehicle propulsion inverter. When the power semiconductor of an inverter operating in a three-leg manner fails, a problem occurs in the power supply. Therefore, this study proposes a method that automatically converts into the two-leg method without replacing the power semiconductor when it fails while the inverter is driven with the three-leg method. This leg conversion method can prevent problems in supplying power by converting the power that can be obtained from an inverter operating with the three-leg method into that obtained from an inverter operating with the two-leg method. In addition, to verify the effectiveness of the leg conversion method, a demonstrative experiment was conducted after a simulation, and an actual inverter was fabricated. Consequently, the experimental results confirmed that in an inverter operating with the three-leg method, even if the power semiconductor failed, it could be converted for operation with the two-leg method to supply power normally.

Keywords: power semiconductor; propulsion inverter; railway vehicles; two-leg and there-leg systems (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: 2023
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