± 180° Discontinuous PWM for Single-Phase PWM Converter of High-Speed Railway Propulsion System

Min-Sup Song, In-Ho Cho and Jae-Bum Lee
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Min-Sup Song: Railroad Test & Certification Division, Korea Railroad Research Institute, Uiwang-si 16105, Korea
In-Ho Cho: Smart Electrical & Signaling Division, Korea Railroad Research Institute, Uiwang-si 16105, Korea
Jae-Bum Lee: Department of Railroad Electrical and Electronics Engineering, Korea National University of Transportation, Uiwang-si 16106

Energies, 2020, vol. 13, issue 7, 1-16

Abstract: As high-capacity alternating current/direct current (ac/dc) power conversion systems, single-phase pulse-width modulation (PWM) converters used in high-speed railway propulsion systems adopt high-voltage Insulated-Gate Bipolar Transistors (IGBTs) as switching elements. Due to their high breakdown voltage characteristics, the switching dynamics are inferior to those of low-voltage IGBTs and switching losses are more dominant than conduction losses despite operating at relatively low switching frequencies of hundreds to several kHz. To solve this problem, this paper proposes ± 180° discontinuous PWM (DPWM) suitable for a single-phase circuit. With the simple addition of offset voltages, the proposed DPWM method can be implemented easily and switching losses can be reduced by half by clamping the switching legs of the H-bridge converter to the positive or negative dc rail during every half cycle. In addition, temperature deviation between the power stacks can be minimized by using selective application of clamping modes. The validity and effectiveness of the proposed DPWM are verified through simulations and experiments of a prototype converter.

Keywords: high-speed railway propulsion system; high-voltage IGBT; PWM converter; discontinuous PWM; switching loss (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: 2020
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