Electrified railway in-phase traction power supply system and control method thereof

Abstract

The invention discloses an electrified railway in-phase traction power supply system and a control method thereof. The in-phase traction power supply system comprises a traction transformer, a compensation matching transformer, an in-phase compensation device, an energy storage device and a measurement and control device. The primary side of the traction transformer is connected with a three-phasehigh-voltage bus, and any two terminals of the secondary side are connected with a traction load. The primary side of the compensation matching transformer is connected with the secondary side of thetraction transformer. The alternating current end of the in-phase compensation device is connected with the secondary side of the compensation matching transformer. The energy storage device is connected with the direct current end of the in-phase compensation device. The measurement and control device is connected with the in-phase compensation device and the energy storage device. According tothe invention, cophase supply of the whole railway is realized, and electric phase separation is cancelled; technical and economic optimization of cophase supply of an electrified railway is effectively realized; and the power quality problem of the negative sequence of a three-phase system, which is caused by the electric locomotive load of the electrified railway, is solved.

Description

technical field [0001] The invention relates to the field of AC electrified railway power supply, in particular to an electrified railway in-phase traction power supply system and a control method thereof. Background technique [0002] The electrified railway in my country generally adopts single-phase power frequency AC system. In order to make the single-phase traction load as balanced as possible in the three-phase power system, the electrified railway often adopts the scheme of alternating phase sequence and split-phase partition power supply. The adjacent power supply intervals at the phase separation partition form a phase separation insulator, which is called electrical phase separation or phase separation. In order to prevent electric locomotives from burning catenary suspension components due to electric split phases due to electric phase separation, and even causing phase-to-phase short circuits and other accidents, as the train speed continues to increase, when th...

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Problems solved by technology

In order to prevent electric locomotives from burning catenary suspension components due to electric split phases due to electric phase separation, and even causing phase-to-phase short circuits and other accidents, as the train speed continues to increase, when the driver cannot manually degrade, turn off auxiliary units, and disconnect the main When the circuit breaker is driven through the neutral section by the inertia of the train, the main circuit breaker is closed again, the auxiliary unit is closed, and the traction power is upgraded to restore the traction power to complete the phase separation, the automatic phase separation technology is adopted, mainly the ground switch automatically switches the phase separation , on-board automatic over-phase separation and on-column automatic over-phase equalization, but there is still a transient electrical process in which the train passes through the electric phase separation during switch switching, which is easy to generate large operating overvoltage or overcurrent, causing the traction network and on-board equipment to burn. damage and other accidents, affecting the reliability of power supply and the safe operation of trains

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