Flexible neutral section passing device for electrified railway and control method

Abstract

The invention discloses a flexible neutral section passing device for an electrified railway and a control method. Relates to the technical field of electrified railway traction power supply. Alternating-current ports are bridged among an alpha-phase power supply arm circuit, a beta-phase power supply arm circuit and an N neutral line circuit at the electric split-phase position of a traction power supply system, direct-current ports are arranged in the device and can be selectively connected with a direct-current source according to needs, and bidirectional circulation and ordered transfer of energy can be carried out among the ports and interconnection lines of the ports. And multi-end and multi-direction power fusion is realized. According to the control method, a power supply section of an electric split-phase position is divided into a plurality of state intervals, and different train operation positions correspond to different device control schemes.

Description

technical field [0001] The invention belongs to the technical field of traction power supply for electrified railways, and in particular relates to a flexible over-phase splitting device and a control method for electrified railways. Background technique [0002] my country's electrified railways generally use a single-phase power-frequency AC power supply system. The three-phase power system is balanced as much as possible by adopting the alternate phase sequence connection method between traction substations. Short circuit, but correspondingly, there will be a power supply dead zone on the traction grid. The power-off-re-power process when the train is over-phased not only causes the loss of system speed and traction, but also causes transient overvoltage, overcurrent, pantograph and catenary arcing and other shock phenomena, which greatly threatens the safe and reliable operation of the train. And it restricts the further high-speed and heavy-duty development of the railw...

AI Technical Summary

Problems solved by technology

The power-off-power-recovery process when the train is over-phased not only causes the loss of system speed and traction force, but also causes impact phenomena such as transient overvoltage, overcurrent, pantograph-catenary arcing, etc., which greatly threatens the safe and reliable operation of the train. And restrict the further development of high-speed and heavy-duty railway

[0003]Existing over-phase separation technology can be summarized as: 1) Power-off over-phase separation represented by early manual power-off and vehicle-mounted automatic over-phase separation is simple in engineering implementation, but there are It is easy to cause problems such as driver fatigue, speed loss, and large transient electrical shock; 2) The switch-type live automatic over-phase represented by the pole-mounted switch over-phase, the mechanical switch ground over-phase, and the electronic switch ground over-equal is the current stage The over-phase separation method mainly adopted by China's railways can alleviate the problem of large speed loss due to power outage, but there is still a power outage process, and it is difficult to fundamentally solve the problem of transient impact and pantograph-catenary arcing; The flexible live automatic over-phase separation represented by the device is an ideal over-phase scheme. The mainstream method is to use one or more sets of back-to-back converter equipment and matching transformers to transfer the required energy from a fixed power supply arm to the neutral section. , through the flexible regulation of voltage and power, the problem of transient impact can be alleviated, which has received widespread attention at this stage, but there are still practical problems such as large number of converter devices, large demand capacity, high cost, and low utilization rate of equipment, and The transfer of energy mentioned above is realized at the expense of increasing the load shock degree on the interconnected power supply arm

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