Bullet train power supply transmission system, AC-DC-AC traction converter and control method thereof

Abstract

The invention provides a bullet train power supply transmission system which is divided into a three-phase power supply transmission mode and a single-phase power supply transmission mode, and the power supply capacities of the two modes are equal. Through automatic identification or cab remote control, when the ground traction power supply system is in the three-phase power supply mode, the bullet train power supply transmission system is automatically switched to the three-phase power supply transmission mode, and when the ground traction power supply system is in the single-phase power supply mode, the bullet train power supply transmission system is automatically switched to the single-phase power supply transmission mode. The mode switching is matched with the three-phase power supply system and the single-phase power supply system of the ground traction power supply system so that the compatibility of the three-phase power supply transmission system and the single-phase power supply transmission system of the bullet train can be conveniently and effectively realized.

Description

technical field [0001] The invention relates to the technical field of rail transit, in particular to a motor vehicle power supply transmission system, an AC-DC-AC traction converter and a control method thereof. Background technique [0002] The current traction power supply of rail transit such as subway and light rail almost all adopts DC 1500V system. The DC system has the advantages of non-separated phase power supply and smooth train operation, but since the regenerative energy accounting for 30% to 50% of the traction energy consumption is difficult to use directly or indirectly, it is necessary to add expensive inverter or energy storage equipment. The inverter device or energy storage device refuses to move, and the regenerative brake of the train fails to turn to the air brake, which threatens the safety of the train. In addition, the stray current that exists will cause electrochemical corrosion to the surrounding metal pipes and steel structures in the building. ...

AI Technical Summary

Problems solved by technology

The DC system has the advantages of non-separated phase power supply and smooth train operation, but since the regenerative energy accounting for 30% to 50% of the traction energy consumption is difficult to use directly or indirectly, it is necessary to add expensive inverter or energy storage equipment. The inverter device or energy storage device refuses to move, and the regenerative brake of the train fails to turn to the air brake, which threatens the safety of the train. In addition, the stray current that exists will cause electrochemical corrosion to the surrounding metal pipes and steel structures in the building. , and the stray current has not been cured so far, causing extensive and long-term harm

[0003] Therefore, under the demand of higher speed and greater transportation volume, the rail transit of some megacities has turned to the single-phase power frequency AC 25kV system of the main line railway, which has the advantages of strong power supply capacity and simple system structure, and the disadvantage is the on-board transformer. Heavy weight and bulky, occupying valuable space of the motor car, increasing the axle load and affecting the efficiency of passenger transport

[0004] At present, the AC traction power supply represented by trunk railway mostly adopts single-phase power frequency AC power supply. However, under the same power supply capacity (capacity), three-phase generators, motors, transformers, and transmission lines are more expensive than those with the same type of components. Manufacturing and construction are more material-saving, and the structure is simple, the performance is excellent, and the instantaneous value of the three-phase electric power remains constant. Chinese utility model patent No. ZL201721675432.8 (a three-phase traction power supply system) discloses a ground three-phase Traction power supply and vehicle three-phase power supply system scheme, since this scheme can only realize ground three-phase traction power supply and vehicle three-phase power supply system scheme, the technical problem that needs to be solved now is how to realize the combination of vehicle three-phase power supply transmission and single-phase power supply transmission Compatible, in order to adapt to the ground traction power supply scheme more flexibly, and make the power supply system more applicable

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