电气化铁道异相供电方式向同相供电方式的转换  

Transfer from out-phase power supply to in-phase power supply

作　　者：张刚毅[1] 李群湛[2] 

机构地区：[1]西安铁路职业技术学院电气工程系,陕西西安710014 [2]西南交通大学电气工程学院,四川成都610031

出　　处：《电力自动化设备》2012年第11期142-145,154,共5页Electric Power Automation Equipment

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。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.

关 键 词：铁路 牵引 断路器 变流器 补偿 

分 类 号：TM922.3[电气工程—电力电子与电力传动]