CN-118739920-B - Control method and device of short-circuit isolating switch for train traction converter

CN118739920BCN 118739920 BCN118739920 BCN 118739920BCN-118739920-B

Abstract

The application discloses a control method and a device of a short-circuit isolating switch for a train traction system, which relate to the technical field of train traction and have the technical scheme that the control method and the device are characterized in that real-time state information of a traction converter and an input current value of the traction converter are obtained; determining an action execution signal of a short-circuit isolating switch according to real-time state information of the traction converter, judging whether the short-circuit isolating switch is allowed to execute the action execution signal according to the input current value, controlling the short-circuit isolating switch to execute the action execution signal if the short-circuit isolating switch is allowed to execute the action execution signal, detecting an action execution state of the short-circuit isolating switch within a preset time, and adjusting the running state of the traction converter according to the action execution state of the short-circuit isolating switch. Through the control method, the requirement of electrified closing of the short-circuit isolating switch can be met, the short-circuit isolating switch can be timely adjusted according to the state of the short-circuit isolating switch, the service life and the use safety of the short-circuit isolating switch are improved, and the safety of the whole equipment is improved.

Inventors

TIAN LE
WANG JUNRAN
MEI WENQING
LIU YONGJIANG
HOU ZHAOWEN
CHEN KE
ZHOU YANG
XIA JING
MA XIAODONG
WEI CHAO

Assignees

株洲中车时代电气股份有限公司

Dates

Publication Date: 20260512
Application Date: 20230330

Claims (8)

1. A control method of a short-circuit isolating switch for a train traction converter is characterized by comprising the following steps of: acquiring real-time state information of a traction converter and an input current value of the traction converter; determining an action execution signal of a short-circuit isolating switch according to the real-time state information of the traction converter, wherein the real-time state information of the traction converter comprises a direct-current voltage value of the traction converter; Judging whether the short-circuit isolating switch is allowed to execute the action executing signal according to the input current value; if the operation is allowed, controlling the short-circuit isolating switch to execute the action executing signal, and detecting the action executing state of the short-circuit isolating switch within the preset time; adjusting the running state of the traction converter according to the action execution state of the short-circuit isolating switch; The method comprises the steps of judging whether a short-circuit isolating switch is allowed to execute an action executing signal according to an input current value, wherein the judgment comprises the steps of selecting a current threshold value of the short-circuit isolating switch, wherein the current threshold value comprises a current maximum value of the short-circuit isolating switch, the current maximum value is allowed to execute the action, comparing the input current value with a preselected current threshold value, and allowing the short-circuit isolating switch to execute the action executing signal when the input current value is smaller than or equal to the current threshold value; the short-circuit isolating switch action executing state detection method comprises the steps of obtaining executing time required by the short-circuit isolating switch to completely execute an action executing signal once, increasing part of reserved time according to the executing time to obtain preset duration of allowing the short-circuit isolating switch to execute the action, and detecting whether the short-circuit isolating switch is executed in place after the preset duration is reached; The control method is applied to a train traction system, wherein the train traction system comprises a main circuit breaker, a traction transformer connected with the main circuit breaker and a traction converter connected with the traction transformer, the traction converter comprises a short-circuit isolating switch connected with the traction transformer, a charging contactor and a charging resistor which are connected in parallel with the short-circuit isolating switch, and the action executing signals comprise a closing executing signal and an opening executing signal; The step of judging whether to allow the short-circuit isolating switch to execute the action executing signal according to the input current value comprises the following steps: When the input current value judges that the short-circuit isolating switch is not allowed to execute the action executing signal, if the action executing signal of the short-circuit isolating switch is closed, the short-circuit isolating switch is controlled to be not actuated; And re-executing the step of acquiring the real-time state information of the traction converter and the input current value of the traction converter according to the new-round action execution signal of the short-circuit isolating switch.
2. The method for controlling a short-circuit isolating switch for a traction converter according to claim 1, wherein the short-circuit isolating switch monitors an input current value of the traction converter in real time and compares the input current value with a current threshold value in the process of executing the action execution signal within a preset time period, and when the input current value is detected to be greater than the current threshold value, the current action execution signal is cancelled after the preset time period is reached.
3. The method for controlling a short-circuit isolating switch for a traction converter of claim 1, wherein determining the action execution signal of the short-circuit isolating switch according to the real-time status information of the traction converter comprises: When the state of the traction converter is that the main circuit breaker and the charging contactor are both closed, acquiring a direct-current voltage value of the traction converter; and judging whether the direct-current voltage value reaches a threshold value, and if the direct-current voltage value reaches the voltage threshold value, obtaining a closing execution signal of the short-circuit isolating switch.
4. A control method of a short-circuit isolation switch for a train traction converter according to claim 3, wherein said adjusting the operation state of the traction converter according to the operation state of the short-circuit isolation switch comprises: When the action execution signal of the short-circuit isolating switch is closed, judging whether the action of the short-circuit isolating switch is executed in place or not; when the action execution signal of the short-circuit isolating switch is off, judging whether the action of the short-circuit isolating switch is executed in place, and if not, controlling the main circuit breaker to be turned off.
5. A control device of a train traction system is characterized by comprising a main circuit breaker, a traction transformer connected with the main circuit breaker and a traction converter connected with the traction transformer, wherein the traction converter comprises a short-circuit isolating switch connected with the traction circuit breaker, and a charging contactor and a charging resistor connected with the short-circuit isolating switch in parallel, and the control device comprises: The acquisition unit is used for acquiring real-time state information of the traction converter and an input current value of the traction converter; the determining unit is connected with the acquiring unit and is used for determining an action executing signal of the short-circuit isolating switch according to the real-time state information of the traction converter, wherein the real-time state information of the traction converter comprises a direct-current voltage value of the traction converter; the comparison unit is connected with the determination unit and used for judging whether the short-circuit isolating switch is allowed to execute the action executing signal according to the input current value; the control unit is connected with the comparison unit and used for controlling the short-circuit isolating switch and the main breaker and controlling the state of the traction system according to the action execution state of the short-circuit isolating switch in the preset time; The method comprises the steps of judging whether a short-circuit isolating switch is allowed to execute an action executing signal according to an input current value, wherein the judgment comprises the steps of selecting a current threshold value of the short-circuit isolating switch, wherein the current threshold value comprises a current maximum value of the short-circuit isolating switch, the current maximum value is allowed to execute the action, comparing the input current value with a preselected current threshold value, and allowing the short-circuit isolating switch to execute the action executing signal when the input current value is smaller than or equal to the current threshold value; The short-circuit isolating switch action executing state detection method comprises the steps of obtaining executing time required by the short-circuit isolating switch to completely execute an action executing signal once, increasing part of reserved time according to the executing time to obtain preset duration of allowing the short-circuit isolating switch to execute the action, and detecting whether the short-circuit isolating switch is executed in place or not after the preset duration is reached; the action execution signal comprises a closing execution signal and an opening execution signal; The step of judging whether to allow the short-circuit isolating switch to execute the action executing signal according to the input current value comprises the following steps: When the input current value judges that the short-circuit isolating switch is not allowed to execute the action executing signal, if the action executing signal of the short-circuit isolating switch is closed, the short-circuit isolating switch is controlled to be not actuated; And re-executing the step of acquiring the real-time state information of the traction converter and the input current value of the traction converter according to the new-round action execution signal of the short-circuit isolating switch.
6. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the control method of any of claims 1 to 4 when the computer program is executed.
7. A computer-readable storage medium, characterized in that a computer program, when executed by a processor, implements the steps of the control method according to any one of claims 1 to 4.
8. A computer program product comprising computer programs/instructions which, when executed by a processor, implement the steps of the control method according to any of claims 1-4.

Description

Control method and device of short-circuit isolating switch for train traction converter Technical Field The invention relates to the technical field of train traction, in particular to a control method and a device of a short-circuit isolating switch for a train traction converter. Background This section is intended to provide a background or context for the embodiments recited in the claims. The description herein is not admitted to be prior art by inclusion in this section. The input side of a conventional traction converter for a train is usually equipped with a charging contactor, a charging resistor and a shorting contactor. When the main circuit breaker is closed, in order to avoid the impact of high voltage of the secondary winding of the traction transformer (or the voltage of the overhead line system in the direct current power supply mode) on the middle supporting capacitor of the converter, a charging contactor is usually closed first to charge the capacitor positioned in the middle direct current loop through a charging resistor, and when the charging reaches a specified threshold, a short-circuit contactor is closed and the charging contactor is opened, so that energy loss and resistance burning caused by continuous input of the charging resistor are avoided. In the prior art, in order to reduce the weight of a traction system of a rail transit vehicle, an electric isolating switch is used for replacing a short-circuit contactor, and on-off control of a traction converter and isolation at serious fault moment are realized by adding the electric isolating switch to control on-off of each heavy traction circuit. The current control of electric isolating switch is usually to regulate and control the opening and closing of electric isolating switch motor, is subject to the ability of electric isolating switch driving motor, and electric isolating switch action is slower, if act under the great circumstances of current value that passes through on the electric isolating switch, leads to the unable normal action of isolating switch easily, and then causes the damage, and because of the abnormal closed that the isolating switch action is not in place, can't in time adjust, and then brings uncertainty for traction current transformer, influences equipment safety. Disclosure of Invention Aiming at the technical problems, the invention provides a control method and a control device for the short-circuit isolating switch for the train traction converter, which can allow the short-circuit isolating switch to act in a live mode under proper current, timely adjust according to the state of the short-circuit isolating switch, improve the service life and the use safety of the short-circuit isolating switch and enhance the safety of the whole equipment. In order to solve the technical problems, the technical scheme adopted by the invention comprises five aspects. In a first aspect, a control method of a short-circuit isolating switch for a train traction converter is provided, including the following steps: acquiring real-time state information of a traction converter and an input current value of the traction converter; Determining an action execution signal of the short-circuit isolating switch according to the real-time state information of the traction converter; Judging whether the short-circuit isolating switch is allowed to execute the action executing signal according to the input current value; if the operation is allowed, controlling the short-circuit isolating switch to execute the action executing signal, and detecting the action executing state of the short-circuit isolating switch within the preset time; and adjusting the running state of the traction converter according to the action execution state of the short-circuit isolating switch. In some embodiments, the determining whether to allow the shorting isolation switch to execute the action execution signal according to the input current value includes: selecting a current threshold value of the short-circuit isolating switch allowing the action to be executed; Comparing the input current value with a preselected current threshold value; and when the input current value is smaller than or equal to the current threshold value, allowing the short-circuit isolating switch to execute the action executing signal. In some embodiments, the detecting the action execution state of the short-circuit isolating switch within the preset time includes: acquiring the execution time required by the short-circuit isolating switch to completely execute an action execution signal once; increasing part of reserved time according to the execution time to obtain preset duration for allowing the short-circuit isolating switch to execute action; and after the preset time length is reached, detecting whether the short-circuit isolating switch is executed in place. In some embodiments, during the process of executing the action execution signal in the preset time peri