Optimization of the Pulse-Width-Modulation Strategy for Three-Level Inverters with Reduced Power Loss

Chaoqun Xiang, Jingrun Du, Xinyu Fu,Ruirui Zhou,Yong Yang,Xinan Zhang

IEEE TRANSACTIONS ON TRANSPORTATION ELECTRIFICATION（2025）

Cent South Univ | Soochow Univ | Univ Western Australia

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Abstract

Junction temperature is the main factor affecting the lifespan of insulated-gate bipolar transistor (IGBT). In order to improve the lifespan of three-phase three-level neutral-point clamped (3P-3L-NPC) inverters, this article proposes a new pulse-width modulation (PWM) strategy that reduces inverter power loss based on clamping current. Compared to the traditional space vector PWM (SVPWM), the proposed method reduces the IGBT junction temperature while ensuring excellent control performance. This will lead to an improved lifespan of 3P-3L-NPC inverter. Furthermore, the proposed PWM strategy maintains the neutral point voltage (NPV) balance in a wide modulation range. The efficacy of the proposed method is verified by simulation and experimental results.

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Key words

Inverters,Vectors,Voltage control,Switches,Junctions,Insulated gate bipolar transistors,Transportation,Clamping current,junction temperature,lifespan,neutral-point voltage,pulse-width modulation (PWM)

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