Suppression of Generator-Side Transient Overvoltage in a DC 600 V Power Car System Based on AZSVPWM.
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| Title: | Suppression of Generator-Side Transient Overvoltage in a DC 600 V Power Car System Based on AZSVPWM. |
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| Authors: | Hou, Fangdong1 (AUTHOR), Chi, Pengfei1,2 (AUTHOR), Gao, Jiakang1,2 (AUTHOR), Liang, Delong1,2 (AUTHOR), Tian, Fuqiang2 (AUTHOR) fqtian@bjtu.edu.cn |
| Source: | Energies (19961073). Jul2026, Vol. 19 Issue 14, p3308. 16p. |
| Subject Terms: | *Electric transients, *Pulse width modulation, *Power quality disturbances, *Electric current rectifiers, *Railroad electrification |
| Abstract: | Generator-side transient overvoltage may occur in DC 600 V AC–DC–AC railway power supply systems because switching-induced common-mode voltage generated by the front-end rectifier can propagate in reverse through cable distributed parameters, grounding impedance, and generator parasitic capacitance. Although AZSVPWM has been widely studied as a common-mode voltage reduction technique, its application to the suppression of generator-side reverse transient overvoltage in railway DC 600 V power supply systems has not been sufficiently investigated. In this paper, AZSVPWM is applied to the front-end active rectifier as a source-side suppression strategy. A high-frequency electromagnetic transient model is developed by considering the generator equivalent impedance, cable distributed parameters, grounding path, and generator winding-to-ground parasitic capacitance. The model is validated by comparing simulated and measured generator terminal voltages under AZSVPWM operation. Based on this model, the common-mode voltage excitation mechanism, reverse propagation path, and overvoltage suppression effect of AZSVPWM are analyzed. The results show that, compared with conventional SVPWM under identical active-rectifier conditions, AZSVPWM reduces the representative peak transient voltage at the generator terminals from 751.37 V to 557.71 V under the 8 m cable condition, corresponding to a reduction of approximately 25.77%. In addition, AZSVPWM-based active rectification improves the low-frequency voltage quality compared with conventional thyristor rectification, and the THD is estimated to decrease from approximately 14.8% to 0.8% based on the FFT spectrum. Parametric analysis further shows that AZSVPWM maintains stable suppression performance for cable lengths of 2–15 m and generator parasitic capacitances of 5–20 nF, with the maximum peak-voltage deviation caused by parasitic capacitance variation being approximately 1.15%. These results indicate that AZSVPWM provides a practical and robust source-side suppression strategy for generator-side transient overvoltage in railway DC 600 V power supply systems. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
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| Abstract: | Generator-side transient overvoltage may occur in DC 600 V AC–DC–AC railway power supply systems because switching-induced common-mode voltage generated by the front-end rectifier can propagate in reverse through cable distributed parameters, grounding impedance, and generator parasitic capacitance. Although AZSVPWM has been widely studied as a common-mode voltage reduction technique, its application to the suppression of generator-side reverse transient overvoltage in railway DC 600 V power supply systems has not been sufficiently investigated. In this paper, AZSVPWM is applied to the front-end active rectifier as a source-side suppression strategy. A high-frequency electromagnetic transient model is developed by considering the generator equivalent impedance, cable distributed parameters, grounding path, and generator winding-to-ground parasitic capacitance. The model is validated by comparing simulated and measured generator terminal voltages under AZSVPWM operation. Based on this model, the common-mode voltage excitation mechanism, reverse propagation path, and overvoltage suppression effect of AZSVPWM are analyzed. The results show that, compared with conventional SVPWM under identical active-rectifier conditions, AZSVPWM reduces the representative peak transient voltage at the generator terminals from 751.37 V to 557.71 V under the 8 m cable condition, corresponding to a reduction of approximately 25.77%. In addition, AZSVPWM-based active rectification improves the low-frequency voltage quality compared with conventional thyristor rectification, and the THD is estimated to decrease from approximately 14.8% to 0.8% based on the FFT spectrum. Parametric analysis further shows that AZSVPWM maintains stable suppression performance for cable lengths of 2–15 m and generator parasitic capacitances of 5–20 nF, with the maximum peak-voltage deviation caused by parasitic capacitance variation being approximately 1.15%. These results indicate that AZSVPWM provides a practical and robust source-side suppression strategy for generator-side transient overvoltage in railway DC 600 V power supply systems. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 19961073 |
| DOI: | 10.3390/en19143308 |
