CN-122026595-A - Emergency power supply method and system under multi-port fault of through traction power supply device

CN122026595ACN 122026595 ACN122026595 ACN 122026595ACN-122026595-A

Abstract

The invention discloses an emergency power supply method and system under multi-port faults of a through traction power supply device, wherein the method comprises the steps of obtaining traction load power of a fault network segment when the number of fault ports of the through traction power supply device is greater than or equal to two; when the traction load power is greater than or equal to a preset load threshold, the electric phase-splitting switch in the traction station and the electric phase-splitting switch between the traction station and the adjacent traction station are disconnected, all the contact switches in the traction station are closed, and after the fault ports are restored to be normal, all the switches are restored to the state when the through traction power supply device is in normal operation. The method of the invention realizes the self-adaptive switching of the emergency power supply mode based on the load power of the fault traction station, and can improve the power supply reliability of the novel through traction power supply system under the multi-port fault condition.

Inventors

CHEN ZIYI
QIAN XINJUN
ZHOU ZHI
WANG XIN
TU CHUNMING
GUO QI
XIAO FAN
JIANG YI
LI JUNHAO
LI TIANLIN
Liao Bijun

Assignees

湖南大学

Dates

Publication Date: 20260512
Application Date: 20260415

Claims (7)

1. An emergency power supply method under a multi-port fault of a through traction power supply device is characterized by comprising the following steps: When the power of the traction load is larger than or equal to a preset load threshold, the electric phase-splitting switch in the traction station and the electric phase-splitting switch between the traction station and the adjacent traction station are disconnected, all the contact switches in the traction station are closed, and after the fault ports are restored to normal, all the switches are restored to the state when the power of the traction power supply is normally operated.
2. The emergency power supply method under a multi-port fault of a through traction power supply device according to claim 1, wherein voltages and currents of two input ports and one output port in the through traction power supply device are monitored in real time, and when power or voltage amplitude of the ports meet a preset fault criterion, the ports are judged to be fault ports.
3. The emergency power supply method under a multi-port fault of a through traction power supply device according to claim 2, wherein obtaining traction load power of a faulty network segment comprises: Collecting traction network voltage of fault network segment And traction load current According to And Obtaining traction load power : 。
4. The emergency power supply method in the event of a multi-port failure of a through traction power supply according to claim 3, wherein, When the traction load power is smaller than a preset load threshold, the switches are kept in a state of being communicated with the traction power supply device during normal operation.
5. The emergency power supply method under multi-port failure of a through-traction power supply according to claim 4, wherein when the number of failed ports of the through-traction power supply is equal to two, the remaining one port is a healthy port; reactive power regulation by the health port, comprising: the direct-current side capacitor of the two-phase-single-phase conversion unit performs direct-current side voltage self-stabilization through self energy storage, and the health port provides reactive power support for the alternating-current side connected with the health port by adjusting the phase of the output current of the alternating-current side.
6. The emergency power supply method under a multi-port fault of a through traction power supply according to claim 5, wherein, when the faulty ports are all restored to normal, restoring each switch to a state when the through traction power supply is operating normally comprises: And if reactive power adjustment is carried out through the health port, the health port is withdrawn from the reactive support state and is restored to the original active power transmission state.
7. An emergency power supply system in the event of a multi-port failure of a through-traction power supply for use in the method of any one of claims 1 to 6, the system comprising a first module, a second module and a third module; The first module is used for acquiring traction load power of a fault network segment when the number of fault ports penetrating through the traction power supply device is greater than or equal to two; the second module is used for switching off the electric phase-splitting switch between the second module and the adjacent traction station and the electric phase-splitting switch in the traction station when the traction load power is larger than or equal to a preset load threshold value, and then switching on all the contact switches in the traction station; and the third module is used for recovering each switch to a state when the through traction power supply device normally operates after the fault port is recovered to be normal.

Description

Emergency power supply method and system under multi-port fault of through traction power supply device Technical Field The invention relates to the technical field of electric railway power control, in particular to an emergency power supply method and system under multi-port faults of a through traction power supply device. Background In order to solve the problems of electric split phase and negative sequence power quality existing in the traditional heterogeneous traction power supply system, a novel through traction power supply device is proposed by a learner in recent years, and particularly, the device is shown in fig. 1. The device introduces a 'two-phase alternating current input-single-phase alternating current output' (hereinafter referred to as 'two-phase-single-phase') conversion unit on the secondary side of the traction transformer on the basis of fully utilizing the existing traction substation equipment. The phase alignment between adjacent traction stations can be realized by adjusting the phase of the output voltage through the conversion unit, so that the continuous power supply across the sections can be realized between the traction power supply sections, and the influence of the electric phase on the operation of a train is reduced. Although the novel through traction power supply device can realize traction power supply system upgrade under a smaller transformation scale and effectively solve the problem of network side power quality, as the novel through traction power supply device integrates a large number of active devices, when the novel through traction power supply device breaks down, the reduction of traction network power supporting capacity and the increase of negative sequence current of a power grid are easily caused, and even the instability of the whole through traction power supply system can be caused under serious conditions. In the prior art, a fault-tolerant operation control method of a hybrid through traction power supply device based on multi-module cooperation is proposed in a patent application document with publication number CN115603312A, and the method is mainly aimed at a single module fault situation, and fault-tolerant operation of the device is realized through module cooperation control. However, this approach does not take into account the entire port failure problem caused by a short circuit, open circuit, or multi-module failure. Furthermore, patent application publication nos. CN115603311a and CN120824757a propose emergency power supply methods applicable to single traction station and multiple traction station input or output port faults, respectively. However, the method is mainly researched aiming at the single-port fault situation, and the extreme working conditions of simultaneous faults of two-phase input ports or three-port faults and the like in the novel through traction power supply device are not considered. When such a multiport failure occurs, the two-phase to single-phase conversion unit fails as a whole, and power cannot be continuously supplied to the traction network. Therefore, a new technical solution is needed to solve the technical problem of how to maintain the continuous power supply capability of the traction power supply system under the multi-port fault of the novel through traction power supply device. Disclosure of Invention The invention provides an emergency power supply method and an emergency power supply system under a multi-port fault of a through traction power supply device, which are used for solving the technical problem of maintaining the continuous power supply capacity of a traction power supply system under the multi-port fault of a novel through traction power supply device. In order to achieve the above object, the present invention provides an emergency power supply method under a multi-port fault of a through traction power supply device, including: When the power of the traction load is larger than or equal to a preset load threshold, the electric phase-splitting switch in the traction station and the electric phase-splitting switch between the traction station and the adjacent traction station are disconnected, all the contact switches in the traction station are closed, and after the fault ports are restored to normal, all the switches are restored to the state when the power of the traction power supply is in normal operation. Preferably, the voltages and currents of two input ports and one output port in the through traction power supply device are monitored in real time, and when the power or voltage amplitude of the ports meets a preset fault criterion, the ports are judged to be fault ports. Preferably, the obtaining traction load power of the faulty network segment includes: Collecting traction network voltage of fault network segment And traction load currentAccording toAndObtaining traction load power: 。 Preferably, when the traction load power is smaller than the preset load threshold, the