Carrier Phase-Shift PWM to Reduce Common-Mode Voltage for Three-Level T-Type NPC Inverters

Common-mode voltage (CMV) causes overvoltage stress to winding insulation and damages AC motors. CMV with highdv/dt causes leakage currents, which create noise problems for equipment installed near the converter. This study proposes a newpulse-width modulation (PWM) strategy for three-level T-type NPC inverters. This strategy substantially eliminates CMV. Theprinciple for selecting suitable triangle carrier signals for the three-level T-type NPC is described. The proposed method canmitigate the peak value of CMV by 50% compared with the phase disposition pulse-width modulation method. Furthermore, theproposed method exhibits better harmonic spectrum and lower root mean square value for the CMV than those of thereduced-CMV method on the basis of the phase opposition disposition PWM scheme with modulation index higher than 0.5. Theproposed modulation can easily be implemented using software without any additional hardware modifications. Both simulationand experimental results demonstrate that the proposed carrier phase-shift PWM method has good output waveform performanceand reduces CMV.

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Cite this article

[IEEE Style]

T. D. Nguyen, D. Q. Phan, D. N. Dao, H. Lee, "Carrier Phase-Shift PWM to Reduce Common-Mode Voltage for Three-Level T-Type NPC Inverters," Journal of Power Electronics, vol. 14, no. 6, pp. 1197-1207, 2014. DOI: 10.6113/JPE.2014.14.6.1197.

[ACM Style]

Tuyen D. Nguyen, Dzung Quoc Phan, Dat Ngoc Dao, and Hong-Hee Lee. 2014. Carrier Phase-Shift PWM to Reduce Common-Mode Voltage for Three-Level T-Type NPC Inverters. Journal of Power Electronics, 14, 6, (2014), 1197-1207. DOI: 10.6113/JPE.2014.14.6.1197.