Control method and system for inhibiting magnetizing inrush current of train traction transformer and train

Abstract

The invention provides a control method and system for restraining magnetizing inrush current of a train traction transformer and a train, and the control method comprises the steps: enabling a network-side converter control system to obtain the electric energy information of a contact network in real time; detecting whether the effective value of the incoming line voltage of the main circuit breaker rises to a set value or not, and if yes, calculating to obtain an inversion control strategy of the grid-side converter according to the currently obtained electric energy information of the overhead line system; driving the grid-side converter to work in an inversion state according to the inversion control strategy of the grid-side converter, and performing inversion to generate modulation voltage; and after the modulation voltage generated by the grid-side converter meets a preset condition, controlling the main circuit breaker to be closed. According to the invention, the grid-side converter is controlled to invert to generate the modulation voltage, and the main circuit breaker is closed after the modulation voltage meets the preset condition, so that the excitation inrush current generated by the traction transformer due to the direct closing of the main circuit breaker after the train passes through the neutral section can be effectively eliminated, the misoperation of the relay is reduced, and the harm of the excitation inrush current can also be reduced.

Description

technical field [0001] The invention relates to the field of train over-phase separation control, in particular to a control method, system and train for suppressing the excitation inrush current of a traction transformer of a train. Background technique [0002] my country's electrified railway uses 25kV single-phase power frequency AC power supply mode. In order to maintain the three-phase load balance of the power system and improve the power utilization rate of the power grid, the electrified railway adopts a segmented and phase-separated power supply mode. In the AC traction power supply system, the catenary generally adopts segmental commutation power supply, and a phase splitting device is installed between each phase. [0003] my country's electrified lines generally adopt the vehicle-mounted over-phase separation method, that is, only high-speed trains are allowed to pass through the phase-separation area by disconnecting the main circuit breaker. reduce. For the g...

AI Technical Summary

Problems solved by technology

[0004] The circuit breaker needs to be used to complete the circuit closing operation immediately after the train passes the phase separation. When the circuit breaker is closed, the traction transformer will be oversaturated due to the sudden change of the primary side voltage of the transformer, and then a very large excitation inrush current will be generated. The magnitude of the excitation inrush current is average It is more than five times the rated current, which will have a very large impact on the high-speed train, and then cause the relay to malfunction

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