| 摘要: |
| 基于原牵引变电所的结构和接线，增设断路器和变流器。通过闭合和开断断路器，使牵引网电压相位一致，实现异相供电向同相供电的转换；变流器作为平衡变换装置，当端口接线角相差 ± 90° 时，采用背靠背单相变流器，相差 ±120° 时，根据接线形式分别采用三桥三端子或三桥四端子变流器；根据所给出的补偿电流公式，不同的平衡变换装置均可输出期望的补偿电流，解决同相供电方式带来的负序电流叠加问题。仿真结果表明，平衡装置投入后，电力系统三相电流为对称的纯正弦基波波形与高频调制波形的叠加，是与电压同相位的正弦波。 |
| 关键词: 铁路 牵引 断路器 变流器 补偿 |
| DOI： |
| 分类号: |
| 基金项目: |
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| Transfer from out-phase power supply to in-phase power supply |
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ZHANG Gangyi1, LI Qunzhan2
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1.Electrical Engineering Institute，Xi’an Railway Vocational and Technical Institute，Xi’an 710014，China;2.School of Electrical Engineering，Southwest Jiaotong University，Chengdu 610031，China
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| Abstract: |
| The out-phase power supply is transferred to in-phase power supply by applying additional breakers and converters to original structure and lines of traction substation. The phases of traction voltage become consistent by switching on／off the breakers. The converter is used as balancing device. Single-phase back-to-back converter is applied when the phase difference between two ports is ± 90°，while three-bridge three-terminal or three-bridge four-terminal converter is applied according to the connection mode when the phase difference is ±120°. The expected compensative current is generated by the balancing device according to the given formula to avoid the superposition of negative currents caused by in-phase power supply. Simulative results show that，the three-phase current of power system is the superposition of the sine fundamental wave and the high-frequency modulation wave，which is in-phase with the voltage. |
| Key words: railroads traction circuit breakers electric converters compensation |
