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Oettmeier et al. (2009) and Zhang (2012a) eliminated the phase break at the substation outlet in co-phase power supply transformations of existing traction substations. While this resolved power quality issues within individual substations, the phase break at the section post between substations remains, preventing mutual energy support and thus hindering the upgrade to multi-substation continuous traction power supply systems. Therefore, an improved continuous power supply system is proposed, with the structure of a single traction substation for continuous power supply shown in Fig. 7.1. A single co-phase power supply traction substation primarily consists of a traditional traction transformer, a two-phase-to-single-phase PWM converter, and a step-up transformer. The traction transformer receives electricity from the three-phase grid and converts it into two-phase voltage. Two single-phase rectifiers are connected to the two-phase input terminals, sharing a DC bus. The rectifiers then output AC power through the single-phase inverter, which is transmitted to the traction network via the step-up transformer. The two-phase-to-single-phase PWM converter operates in four quadrants, allowing bidirectional active power flow between the three-phase grid and the single-phase traction network. The reactive energy from the traction load will not be transmitted to the three-phase grid which operates at unity power factor. This significantly addresses the power quality issues caused by locomotive loads in traditional traction power supply systems. The single-phase inverter not only supplies the reactive power demanded by the locomotive load but also provides harmonic control. Its adjustable output voltage amplitude, phase, and frequency enable continuous co-phase power supply along the entire line (Zhang 2012b; Pi et al. 2008). This approach eliminates phase breaks within and between existing traction substations, reduces the requirements for the installed capacity of individual substations, and enhances the operating efficiency of the system.

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Analysis and Control of Two-Phase-to-Single-Phase Converter

  • 章节

  • 发表日期：

    2025年

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  • Zeliang Shu

摘要

Oettmeier et al. (2009) and Zhang (2012a) eliminated the phase break at the substation outlet in co-phase power supply transformations of existing traction substations. While this resolved power quality issues within individual substations, the phase break at the section post between substations remains, preventing mutual energy support and thus hindering the upgrade to multi-substation continuous traction power supply systems. Therefore, an improved continuous power supply system is proposed, with the structure of a single traction substation for continuous power supply shown in Fig. 7.1. A single co-phase power supply traction substation primarily consists of a traditional traction transformer, a two-phase-to-single-phase PWM converter, and a step-up transformer. The traction transformer receives electricity from the three-phase grid and converts it into two-phase voltage. Two single-phase rectifiers are connected to the two-phase input terminals, sharing a DC bus. The rectifiers then output AC power through the single-phase inverter, which is transmitted to the traction network via the step-up transformer. The two-phase-to-single-phase PWM converter operates in four quadrants, allowing bidirectional active power flow between the three-phase grid and the single-phase traction network. The reactive energy from the traction load will not be transmitted to the three-phase grid which operates at unity power factor. This significantly addresses the power quality issues caused by locomotive loads in traditional traction power supply systems. The single-phase inverter not only supplies the reactive power demanded by the locomotive load but also provides harmonic control. Its adjustable output voltage amplitude, phase, and frequency enable continuous co-phase power supply along the entire line (Zhang 2012b; Pi et al. 2008). This approach eliminates phase breaks within and between existing traction substations, reduces the requirements for the installed capacity of individual substations, and enhances the operating efficiency of the system.