Train traction circuit voltage regulation method, device and equipment and readable storage medium

Abstract

The invention discloses a train traction circuit voltage regulation method, device and equipment and a readable storage medium, and the method comprises the steps: obtaining a first real-time voltage value of an intermediate DC loop if a fault of a traction inverter is detected; if the first real-time voltage value is greater than a first target voltage regulation value of the four-quadrant rectifier, sending a first parameter modification instruction to the four-quadrant rectifier, the first parameter modification instruction being used for indicating to modify the first target voltage regulation value into a second target voltage regulation value, and the four-quadrant rectifier adjusts the first real-time voltage value to the second real-time voltage value according to the second target voltage adjustment value. Therefore, when the train control unit detects that the traction inverter breaks down, the train control unit can send the first parameter modification instruction to the four-quadrant rectifier to lower the target voltage regulation value of the four-quadrant rectifier, so that the four-quadrant rectifier can lower the first real-time voltage value of the intermediate direct-current loop more quickly; therefore, the voltage stability of the train traction circuit is improved.

Description

Technical Field

[0001] The present application relates to the field of communications, and more specifically, to a method, device, equipment and readable storage medium for regulating the voltage of a train traction circuit. Background Art

[0002] With the rapid development of the rail transit industry, permanent magnet motors have gradually been widely used in the rail transit industry due to their significant advantages such as light weight, high efficiency and reliable operation.

[0003] However, since the permanent magnets of the permanent magnet motor have their own magnetic field, when a traction inverter of a certain axis fails during the operation of the train, resulting in control failure, the three-phase winding of the stator of the permanent magnet motor cuts the rotating magnetic field of the rotor, causing the permanent magnet motor to output back electromotive force. And as the speed increases, the back electromotive force increases, and the voltage applied by the reverse rectification to the intermediate DC circuit and the traction inverter will far exceed the safe operating range, which will cause the capacitor of the intermediate DC circuit, the switching devices of the traction inverter, etc. to have the risk of breakdown, affecting the normal operation of the whole vehicle. Summary of the invention

[0004] Embodiments of the present application provide a method, device, equipment and readable storage medium for regulating the voltage of a train traction circuit, which can improve the stability of the voltage of the train traction circuit when a traction inverter fails.

[0005] In view of this, an embodiment of the present application provides a train traction circuit voltage regulation method, which is applied to a train control unit, comprising:

[0006] If a traction inverter failure is detected, obtaining a first real-time voltage value of the intermediate DC circuit;

[0007] If the first real-time voltage value is greater than the first target voltage adjustment value of the four-quadrant rectifier, a first parameter modification instruction is sent to the four-quadrant rectifier, and the first parameter modification instruction is used to instruct to modify the first target voltage adjustment value to a second target voltage adjustment value, so that the four-quadrant rectifier adjusts the first real-time voltage value to a second real-time voltage value according to the second target voltage adjustment value, and the second target voltage adjustment value is less than the first target voltage adjustment value.

[0008] Optionally, after modifying the first target voltage adjustment value to a second target adjustment value, the method further includes:

[0009] Get the peak value of the motor back EMF;

[0010] If the peak value of the motor back EMF is less than the first target voltage adjustment value, a second parameter modification instruction is sent to the four-quadrant rectifier, and the second parameter modification instruction is used to instruct the second target voltage adjustment value to be modified to the first target voltage adjustment value, so that the four-quadrant rectifier can adjust the second real-time voltage value to a third real-time voltage value according to the first target voltage adjustment value.

[0011] Optionally, obtaining the peak value of the motor back-EMF includes:

[0012] Get the motor speed;

[0013] The peak value of the motor back-EMF is determined according to the motor speed and the corresponding relationship between the motor speed and the peak value of the motor back-EMF.

[0014] The embodiment of the present application also provides a train traction circuit voltage regulation method, which is applied to a four-quadrant rectifier, comprising:

[0015] receiving a first parameter modification instruction from a train control unit, wherein the first parameter modification instruction is used to instruct to modify a first target voltage adjustment value of the four-quadrant rectifier to a second target voltage adjustment value, wherein the second target voltage adjustment value is less than the first target voltage adjustment value;

[0016] modifying the first target voltage adjustment value to a second target voltage adjustment value according to the first parameter modification instruction;

[0017] The first real-time voltage value of the intermediate DC circuit is adjusted to a second real-time voltage value according to the second target voltage adjustment value.

[0018] Optionally, in the step of adjusting the first real-time voltage value of the intermediate DC circuit to the second real-time voltage value according to the second target voltage adjustment value, the method further includes:

[0019] receiving a second parameter modification instruction from a train control unit, wherein the second parameter modification instruction is used to instruct to modify the second target voltage adjustment value to the first target voltage adjustment value;

[0020] modifying the second target voltage adjustment value to the first target voltage adjustment value according to the second parameter modification instruction;

[0021] The second real-time voltage value is adjusted to a third real-time voltage value according to the first target voltage adjustment value.

[0022] The embodiment of the present application further provides a train traction circuit voltage regulating device, which is applied to a train control unit, including:

[0023] An acquisition module, configured to acquire a first real-time voltage value of the intermediate DC circuit if a fault of the traction inverter is detected;

[0024] A sending module is used to send a first parameter modification instruction to the four-quadrant rectifier if the first real-time voltage value is greater than the first target voltage adjustment value of the four-quadrant rectifier, and the first parameter modification instruction is used to indicate that the first target voltage adjustment value is modified to a second target voltage adjustment value, so that the four-quadrant rectifier adjusts the first real-time voltage value to a second real-time voltage value according to the second target voltage adjustment value, and the second target voltage adjustment value is less than the first target voltage adjustment value.

[0025] Optionally, the device further comprises:

[0026] The acquisition module is also used to acquire the peak value of the motor back electromotive force;

[0027] The sending module is also used to send a second parameter modification instruction to the four-quadrant rectifier if the peak value of the motor back electromotive force is less than the first target voltage adjustment value. The second parameter modification instruction is used to instruct to modify the second target voltage adjustment value to the first target voltage adjustment value, so that the four-quadrant rectifier can adjust the second real-time voltage value to a third real-time voltage value according to the first target voltage adjustment value.

[0028] The embodiment of the present application also provides a train traction circuit voltage regulating device, which is applied to a four-quadrant rectifier, including:

[0029] a receiving module, configured to receive a first parameter modification instruction from a train control unit, wherein the first parameter modification instruction is used to instruct to modify a first target voltage adjustment value of the four-quadrant rectifier to a second target voltage adjustment value, wherein the second target voltage adjustment value is less than the first target voltage adjustment value;

[0030] a modification module, configured to modify the first target voltage adjustment value to a second target voltage adjustment value according to the first parameter modification instruction;

[0031] The adjustment module is used to adjust the first real-time voltage value of the intermediate DC circuit to a second real-time voltage value according to the second target voltage adjustment value.

[0032] The embodiment of the present application also provides a computer device, including: a memory, a processor, and a bus system;

[0033] Wherein, the memory is used to store programs;

[0034] The processor is used to execute the program in the memory to implement any one of the above-mentioned train traction circuit voltage regulation methods;

[0035] The bus system is used to connect the memory and the processor so that the memory and the processor can communicate with each other.

[0036] An embodiment of the present application also provides a computer-readable storage medium storing instructions, which, when executed on a computer, enables the computer to execute any one of the train traction circuit voltage regulation methods described above.

[0037] The embodiment of the present application provides a train voltage document method, including: if a traction inverter is detected to have a fault, obtaining a first real-time voltage value of an intermediate DC circuit; if the first real-time voltage value is greater than a first target voltage adjustment value of a four-quadrant rectifier, sending a first parameter modification instruction to the four-quadrant rectifier, the first parameter modification instruction is used to instruct to modify the first target voltage adjustment value to a second target voltage adjustment value, so that the four-quadrant rectifier adjusts the first real-time voltage value to a second real-time voltage value according to the second target voltage adjustment value, and the second target voltage adjustment value is less than the first target voltage adjustment value. It can be seen that when the train control unit detects that the traction inverter has a fault and the first real-time voltage value of the intermediate DC circuit is greater than the first target voltage adjustment value of the four-quadrant rectifier, the train control unit can lower the target voltage adjustment value of the four-quadrant rectifier by sending a first parameter modification instruction to the four-quadrant rectifier, so that the four-quadrant rectifier can more quickly lower the first real-time voltage value of the intermediate DC circuit, thereby improving the stability of the train traction circuit voltage, thereby avoiding the breakdown of the capacitor of the intermediate DC circuit of the train and the switch device of the traction inverter, and ensuring the normal operation of the train. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0039] Figure 1 A schematic diagram of the structure of a traction circuit of a train provided in an embodiment of the present application;

[0040] Figure 2 A flow chart of a method for regulating voltage of a train traction circuit provided in an embodiment of the present application;

[0041] Figure 3 A schematic flow chart of another method for regulating voltage of a train traction circuit provided in an embodiment of the present application;

[0042] Figure 4A schematic diagram of the structure of a train traction circuit voltage regulating device provided in an embodiment of the present application;

[0043] Figure 5 A schematic diagram of the structure of another train traction circuit voltage regulating device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0046] With the rapid development of rail transit industry, Figure 1 As shown, the current traction circuit of a train may include a train control unit, a grid-side circuit, a four-quadrant rectifier circuit, an intermediate DC circuit, an inverter circuit, an isolation contactor, and a permanent magnet motor.

[0047] The Train Control Unit (TCU) is responsible for controlling the operation of the train, including core functions such as acceleration, deceleration, and braking. The TCU ensures the safe and efficient operation of the train by receiving information from the signal system and communicating with other trains and infrastructure.

[0048] The network test circuit is mainly used to obtain energy from the contact network and transmit it to the primary winding of the transformer through the circuit breaker to power the train.

[0049] The four-quadrant rectifier is used to control the stability of the power factor of the intermediate motor and the grid side. The four-quadrant rectifier is a new type of rectifier that converts AC into DC. It can realize functions such as feedback braking, high-speed speed regulation and weak field speed regulation on electric locomotives, and is one of the indispensable electronic components in electric locomotives. The four-quadrant rectifier can perform AC-DC conversion under traction conditions to provide power for the intermediate DC circuit; under regenerative braking conditions, it performs DC-AC conversion through the intermediate DC circuit to feed power back to the grid.

[0050] The intermediate DC circuit is used to reduce the amplitude of voltage fluctuations in the circuit and reduce the interference of the power grid on the motor.

[0051] The inverter circuit is used to convert the intermediate DC voltage into three-phase AC power with the frequency and amplitude required by the motor according to the train operation requirements.

[0052] The isolation contactor is used to close under normal operating conditions and open under converter fault conditions to isolate the permanent magnet motor from the converter main circuit.

[0053] Permanent magnet motors are used to convert electrical energy into mechanical energy to output torque, providing traction for train operation.

[0054] With the rapid development of the rail transit industry, permanent magnet motors have gradually been widely used in the rail transit industry due to their significant advantages such as light weight, high efficiency and reliable operation.

[0055] However, since the permanent magnets of the permanent magnet motor have their own magnetic field, when a traction inverter of a certain axis fails during the operation of the train, resulting in control failure, the three-phase winding of the stator of the permanent magnet motor cuts the rotating magnetic field of the rotor, causing the permanent magnet motor to output back electromotive force. And as the speed increases, the back electromotive force increases, and the voltage applied by the reverse rectification to the intermediate DC circuit and the traction inverter will far exceed the safe operating range, which will cause the capacitor of the intermediate DC circuit, the switching devices of the traction inverter, etc. to have the risk of breakdown, affecting the normal operation of the whole vehicle.

[0056] In order to solve the risks caused by the back EMF when the permanent magnet motor runs at high speed, a three-phase isolation contactor, also called an isolation contactor, is often connected in series between the output side of the traction inverter and the input side of the permanent magnet motor. When a fault pulse is blocked in the traction inverter of a certain axis, the isolation contactor of the axis is disconnected, and the permanent magnet motors of other axles work normally, and the whole vehicle continues to run. However, it takes a certain amount of time for the isolation contactor to disconnect from receiving the signal. At high speed, the high back EMF of the permanent magnet motor flows into the intermediate DC link through the reverse rectification of the inverter diode, causing the intermediate voltage to rise rapidly. Although there is a chopper circuit in the intermediate DC link, the chopper opening time and module power are limited, and it is impossible to quickly and continuously consume the energy brought by the high back EMF.

[0057] Therefore, in response to the above problems, the embodiments of the present application provide a train traction circuit voltage regulation method, device, equipment and readable storage medium, which can improve the stability of the train traction circuit voltage when a traction inverter fails.

[0058] See also Figure 2 A train traction circuit voltage regulation method provided in an embodiment of the present application includes the following steps.

[0059] S201. If a traction inverter failure is detected, the train control unit obtains a first real-time voltage value of the intermediate DC circuit.

[0060] In this embodiment, the train controller can monitor the devices on the train in real time. When the train controller detects that the traction inverter in the train fails, the permanent magnet motor will output back electromotive force. The reverse rectification caused by the back electromotive force is applied to the intermediate DC circuit and the traction inverter, which will cause the voltage of the intermediate DC circuit to increase rapidly, thereby causing the intermediate DC circuit capacitor, traction inverter switch devices, etc. to have the risk of breakdown. Therefore, at this time, the train control unit can obtain the first real-time voltage value of the intermediate DC circuit to determine the change of the voltage of the intermediate DC circuit when the traction inverter fails. Specifically, the first real-time voltage value can be the voltage value corresponding to the capacitor of the intermediate DC circuit.

[0061] S202. If the first real-time voltage value is greater than the first target voltage adjustment value of the four-quadrant rectifier, the train control unit sends a first parameter modification instruction to the four-quadrant rectifier.

[0062] The first parameter modification instruction is used to instruct to modify the first target voltage adjustment value to a second target voltage adjustment value, and the second target voltage adjustment value is smaller than the first target voltage adjustment value.

[0063] In the embodiment of the present application, after obtaining the first real-time voltage value of the intermediate DC circuit, the train control unit can compare the first real-time voltage value with the first target voltage adjustment value of the four-quadrant rectifier. If the first real-time voltage value is greater than the first target voltage adjustment value, it can be determined that the voltage fluctuation of the intermediate DC circuit is relatively severe at this time. At this time, the target voltage adjustment value of the four-quadrant rectifier can be lowered by sending a first parameter modification instruction to the four-quadrant rectifier, so that the four-quadrant rectifier can more quickly lower the first real-time voltage value of the intermediate DC circuit, thereby improving the stability of the train traction circuit voltage, thereby avoiding the breakdown of the capacitor and traction inverter switch device of the intermediate DC circuit of the train, and ensuring the normal operation of the train. Among them, the target voltage adjustment value of the four-quadrant rectifier can be the adjustment reference value of the control algorithm of the four-quadrant rectifier, that is, the four-quadrant rectifier can stabilize the voltage value of the intermediate circuit at about the target voltage adjustment value through the control algorithm. It can be understood that the train control unit can pre-store the first target voltage adjustment value currently used by the four-quadrant rectifier. After obtaining the first real-time voltage value, the voltage fluctuation condition of the intermediate DC circuit at this time can be determined by comparing it with the first target voltage adjustment value. In addition, the train control unit can communicate with the four-quadrant rectifier via a control bus.

[0064] S203. The four-quadrant rectifier receives a first parameter modification instruction from a train control unit.

[0065] The first parameter modification instruction is used to instruct to modify the first target voltage adjustment value of the four-quadrant rectifier to a second target voltage adjustment value, and the second target voltage adjustment value is smaller than the first target voltage adjustment value.

[0066] In an embodiment of the present application, after the train control unit sends a first parameter modification instruction to the four-quadrant rectifier, the four-quadrant rectifier can receive the first parameter modification instruction from the train control unit, so that the four-quadrant rectifier can lower the target voltage adjustment value of the four-quadrant rectifier according to the first parameter modification instruction, so that the four-quadrant rectifier can lower the first real-time voltage value of the intermediate DC circuit more quickly, thereby improving the stability of the train traction circuit voltage, and then avoiding the breakdown of the capacitor and traction inverter switching devices of the intermediate DC circuit of the train, ensuring the normal operation of the train.

[0067] S204. The four-quadrant rectifier modifies the first target voltage adjustment value to a second target voltage adjustment value according to the first parameter modification instruction.

[0068] In the embodiment of the present application, after receiving the first parameter modification instruction, the four-quadrant rectifier can modify the first target voltage adjustment value to a second target voltage adjustment value with a smaller value according to the first parameter modification instruction. It can be understood that the greater the difference between the real-time voltage value of the intermediate DC circuit and the target voltage adjustment value, the greater the voltage adjustment amplitude will be used by the four-quadrant rectifier to adjust and control the real-time voltage value, so that the real-time voltage value of the intermediate DC circuit can be quickly stabilized near the target voltage adjustment value. Therefore, the four-quadrant rectifier modifies the first target voltage adjustment value to a second target voltage adjustment value with a smaller value, so that the four-quadrant rectifier can more quickly lower the first real-time voltage value of the intermediate DC circuit, thereby improving the stability of the train traction circuit voltage, thereby avoiding the breakdown of the capacitor and traction inverter switch device of the intermediate DC circuit of the train, and ensuring the normal operation of the train.

[0069] S205. The four-quadrant rectifier adjusts the first real-time voltage value of the intermediate DC circuit to a second real-time voltage value according to the second target voltage adjustment value.

[0070] In the embodiment of the present application, after the four-quadrant rectifier modifies the first target voltage adjustment value to a second target voltage adjustment value with a smaller value, it can quickly adjust the first real-time voltage value of the intermediate DC circuit to a second real-time voltage value according to the second target voltage adjustment value, wherein the second real-time voltage value can be less than or equal to the first real-time voltage value. Specifically, the four-quadrant rectifier can convert direct current to alternating current through the intermediate DC circuit and feed the electric energy back to the power supply network, thereby being able to quickly reduce the electric energy of the intermediate DC circuit, that is, quickly lower the first real-time voltage value of the intermediate DC circuit, and improve the stability of the voltage of the train traction circuit.

[0071] In a possible implementation of the embodiment of the present application, the method further includes:

[0072] S206. The train control unit obtains the peak value of the motor back-electromotive force.

[0073] In an embodiment of the present application, after sending the first parameter modification instruction to the four-quadrant rectifier, the train control unit can also obtain the peak value of the motor back electromotive force of the permanent magnet motor, so as to determine the impact of the back electromotive force of the permanent magnet motor on voltage stability after the four-quadrant rectifier adjusts the first real-time voltage value of the intermediate DC circuit based on the second target voltage regulation value.

[0074] In a possible implementation of an embodiment of the present application, the train control unit obtains the peak value of the motor back EMF, including: obtaining the motor speed; determining the peak value of the motor back EMF according to the motor speed and the correspondence between the motor speed and the peak value of the motor back EMF. In an embodiment of the present application, the train control unit may store the correspondence between the motor speed of the permanent magnet motor and the peak value of the motor back EMF of the permanent magnet motor. The train control unit may first obtain the motor speed of the permanent magnet motor, and then query the correspondence between the motor speed of the permanent magnet motor and the peak value of the motor back EMF of the permanent magnet motor according to the motor speed of the permanent magnet motor to determine the peak value of the motor back EMF of the permanent magnet motor.

[0075] S207. If the peak value of the motor back electromotive force is less than the first target voltage adjustment value, the train control unit sends a second parameter modification instruction to the four-quadrant rectifier.

[0076] The second parameter modification instruction is used to instruct to modify the second target voltage adjustment value to the first target voltage adjustment value.

[0077] In the embodiment of the present application, after obtaining the peak value of the motor back EMF of the permanent magnet motor, the train control unit can compare the peak value of the motor back EMF with the first target voltage adjustment value. If the peak value of the motor back EMF is less than the first target voltage adjustment value, it can be determined that the influence of the back EMF of the permanent magnet motor on the voltage stability has become smaller, that is, the voltage fluctuation of the intermediate DC circuit has become smaller, so the train control unit can send a second parameter modification instruction to the four-quadrant rectifier to restore the target voltage adjustment value of the four-quadrant rectifier to a normal level, thereby improving the stability of the train traction circuit voltage.

[0078] S208. The four-quadrant rectifier receives a second parameter modification instruction from the train control unit.

[0079] The second parameter modification instruction is used to instruct to modify the second target voltage adjustment value to the first target voltage adjustment value.

[0080] In an embodiment of the present application, the four-quadrant rectifier can receive a second parameter modification instruction from the train control unit so that the target voltage adjustment value of the four-quadrant rectifier can be restored to a normal level based on the second parameter modification instruction, thereby improving the stability of the train traction circuit voltage.

[0081] S209. The four-quadrant rectifier modifies the second target voltage adjustment value to the first target voltage adjustment value according to the second parameter modification instruction.

[0082] In an embodiment of the present application, after receiving the second parameter modification instruction from the train control unit, the four-quadrant rectifier can modify the second target voltage adjustment value to the first target voltage adjustment value according to the second parameter modification instruction, so as to restore the target voltage adjustment value of the four-quadrant rectifier to a normal level, so that the four-quadrant rectifier can adjust the train voltage based on the normal level, thereby improving the stability of the train traction circuit voltage.

[0083] S210. The four-quadrant rectifier adjusts the second real-time voltage value to a third real-time voltage value according to the first target voltage adjustment value.

[0084] In an embodiment of the present application, after the four-quadrant rectifier modifies the second target voltage adjustment value to the first target voltage adjustment value, the second real-time voltage value of the intermediate DC circuit can be adjusted to a third real-time voltage value according to the first target voltage adjustment value, wherein the third real-time voltage value can be less than or equal to the second real-time voltage value.

[0085] It can be seen from this that an embodiment of the present application provides a method for regulating the voltage of a train traction circuit. When the train control unit detects that a traction inverter has failed and the first real-time voltage value of the intermediate DC circuit is greater than the first target voltage regulation value of the four-quadrant rectifier, the train control unit can lower the target voltage regulation value of the four-quadrant rectifier by sending a first parameter modification instruction to the four-quadrant rectifier, so that the four-quadrant rectifier can lower the first real-time voltage value of the intermediate DC circuit more quickly, thereby improving the stability of the train traction circuit voltage, and then avoiding the breakdown of the capacitors and traction inverter switching devices of the intermediate DC circuit of the train, thereby ensuring that the train can operate normally.

[0086] In order to make the technical solution of the present application clearer and easier to understand, the train traction circuit voltage regulation method of the present application is described in detail below in combination with a specific train operation scenario.

[0087] See also Figure 3 , the embodiment of the present application provides another method for regulating the voltage of a train traction circuit, which specifically includes the following steps:

[0088] (1) The train closed isolation contactor operates normally, and the TCU monitors the intermediate voltage in real time;

[0089] (2) When a shaft inverter in the traction main circuit fails, the traction inverter control of the shaft fails and pulses are blocked;

[0090] (3) TCU sends a command to disconnect the faulty shaft isolation contactor;

[0091] (4) During the disconnection process of the isolation contactor, the peak value of the motor back EMF is reverse rectified by the traction inverter to quickly raise the intermediate voltage. The intermediate voltage of the intermediate DC circuit is obtained. When the intermediate voltage is less than or equal to the first target voltage adjustment value of the four-quadrant rectifier, the other axles operate normally, the train continues to run, and the TCU continues to monitor the intermediate voltage in real time;

[0092] (5) When the intermediate voltage is greater than the first target voltage adjustment value of the four-quadrant rectifier, the target voltage adjustment value of the four-quadrant rectifier is reduced to the second target voltage adjustment value; and energy is quickly fed back to the contact network from the intermediate DC link via the four-quadrant rectifier.

[0093] (6) Look up the table to determine the corresponding motor back-EMF peak value at the permanent magnet motor speed. When the motor back-EMF peak value of the permanent magnet motor is less than or equal to the first target voltage adjustment value, the target voltage adjustment value of the four-quadrant rectifier is restored to the first target voltage adjustment value, the other axles operate normally, and the train continues to run at the current speed.

[0094] (7) When the peak value of the motor back electromotive force of the permanent magnet motor is greater than the first target voltage adjustment value, return to execute the above step (5).

[0095] It can be seen that the embodiment of the present application provides another method for regulating the voltage of the train traction circuit. In order to improve the reliability, safety and energy utilization of the permanent magnet traction system, the target voltage regulation value corresponding to the four-quadrant rectifier control algorithm is reduced, and the energy is quickly fed back to the power grid from the intermediate DC circuit to reduce the intermediate voltage of the intermediate DC circuit. When the peak value of the motor back electromotive force of the permanent magnet motor at the current speed is less than or equal to the first target voltage regulation value, the original target voltage regulation value of the four-quadrant rectifier control algorithm is restored, and the train continues to run, thereby improving the stability of the train traction circuit voltage.

[0096] See also Figure 4 The embodiment of the present application further provides a train traction circuit voltage regulating device, which is applied to a train control unit, comprising:

[0097] An acquisition module 401 is used to acquire a first real-time voltage value of the intermediate DC circuit if a fault is detected in the traction inverter;

[0098] A sending module 402 is used to send a first parameter modification instruction to the four-quadrant rectifier if the first real-time voltage value is greater than the first target voltage adjustment value of the four-quadrant rectifier, and the first parameter modification instruction is used to indicate that the first target voltage adjustment value is modified to a second target voltage adjustment value, so that the four-quadrant rectifier adjusts the first real-time voltage value to a second real-time voltage value according to the second target voltage adjustment value, and the second target voltage adjustment value is less than the first target voltage adjustment value.

[0099] Optionally, the device further comprises:

[0100] The acquisition module 401 is also used to acquire the peak value of the motor back electromotive force;

[0101] The sending module 402 is also used to send a second parameter modification instruction to the four-quadrant rectifier if the peak value of the motor back electromotive force is less than the first target voltage adjustment value. The second parameter modification instruction is used to indicate that the second target voltage adjustment value is modified to the first target voltage adjustment value, so that the four-quadrant rectifier can adjust the second real-time voltage value to a third real-time voltage value according to the first target voltage adjustment value.

[0102] Optionally, the acquisition module 401 is specifically configured to:

[0103] Get the motor speed;

[0104] The peak value of the motor back-EMF is determined according to the motor speed and the corresponding relationship between the motor speed and the peak value of the motor back-EMF.

[0105] It can be seen from this that an embodiment of the present application provides a train traction circuit voltage regulation device. When the train control unit detects that the traction inverter has a fault and the first real-time voltage value of the intermediate DC circuit is greater than the first target voltage regulation value of the four-quadrant rectifier, the train control unit can lower the target voltage regulation value of the four-quadrant rectifier by sending a first parameter modification instruction to the four-quadrant rectifier, so that the four-quadrant rectifier can lower the first real-time voltage value of the intermediate DC circuit more quickly, thereby improving the stability of the train traction circuit voltage, and then avoiding the breakdown of the capacitor and traction inverter switching devices of the train's intermediate DC circuit, ensuring the normal operation of the train.

[0106] See also Figure 5 The embodiment of the present application also provides a train traction circuit voltage regulating device, which is applied to a four-quadrant rectifier, including:

[0107] A receiving module 501 is used to receive a first parameter modification instruction from a train control unit, wherein the first parameter modification instruction is used to instruct to modify a first target voltage adjustment value of the four-quadrant rectifier to a second target voltage adjustment value, wherein the second target voltage adjustment value is less than the first target voltage adjustment value;

[0108] A modification module 502, configured to modify the first target voltage adjustment value to a second target voltage adjustment value according to the first parameter modification instruction;

[0109] The adjustment module 503 is configured to adjust the first real-time voltage value of the intermediate DC circuit to a second real-time voltage value according to the second target voltage adjustment value.

[0110] Optionally, the device further comprises:

[0111] The receiving module 501 is further used to receive a second parameter modification instruction from the train control unit, where the second parameter modification instruction is used to instruct to modify the second target voltage adjustment value to the first target voltage adjustment value;

[0112] The modification module 502 is further configured to modify the second target voltage adjustment value to the first target voltage adjustment value according to the second parameter modification instruction;

[0113] The adjustment module 503 is further configured to adjust the second real-time voltage value to a third real-time voltage value according to the first target voltage adjustment value.

[0114] It can be seen from this that an embodiment of the present application provides a train traction circuit voltage regulation device. When the train control unit detects that the traction inverter has a fault and the first real-time voltage value of the intermediate DC circuit is greater than the first target voltage regulation value of the four-quadrant rectifier, the train control unit can lower the target voltage regulation value of the four-quadrant rectifier by sending a first parameter modification instruction to the four-quadrant rectifier, so that the four-quadrant rectifier can lower the first real-time voltage value of the intermediate DC circuit more quickly, thereby improving the stability of the train traction circuit voltage, and then avoiding the breakdown of the capacitor and traction inverter switching devices of the train's intermediate DC circuit, ensuring the normal operation of the train.

[0115] The embodiment of the present application also provides a computer device, including: a memory, a processor, and a bus system;

[0116] Wherein, the memory is used to store programs;

[0117] The processor is used to execute the program in the memory to implement the above-mentioned security authentication method;

[0118] The bus system is used to connect the memory and the processor so that the memory and the processor can communicate with each other.

[0119] An embodiment of the present application also provides a computer-readable storage medium storing instructions, which, when executed on a computer, enables the computer to execute a security authentication method as described above.

[0120] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0121] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for regulating the voltage of a train traction circuit, characterized in that: Applied to a train control unit, the method comprises: If a traction inverter failure is detected, obtaining a first real-time voltage value of the intermediate DC circuit; If the first real-time voltage value is greater than the first target voltage adjustment value of the four-quadrant rectifier, a first parameter modification instruction is sent to the four-quadrant rectifier, and the first parameter modification instruction is used to instruct to modify the first target voltage adjustment value to a second target voltage adjustment value, so that the four-quadrant rectifier adjusts the first real-time voltage value to a second real-time voltage value according to the second target voltage adjustment value, and the second target voltage adjustment value is less than the first target voltage adjustment value.

2. The method according to claim 1, characterized in that After the first target voltage adjustment value is modified to a second target voltage adjustment value, the method further includes: Get the peak value of the motor back EMF; If the peak value of the motor back EMF is less than the first target voltage adjustment value, a second parameter modification instruction is sent to the four-quadrant rectifier, and the second parameter modification instruction is used to instruct the second target voltage adjustment value to be modified to the first target voltage adjustment value, so that the four-quadrant rectifier can adjust the second real-time voltage value to a third real-time voltage value according to the first target voltage adjustment value.

3. The method according to claim 2, characterized in that The step of obtaining the peak value of the motor back electromotive force comprises: Get the motor speed; The peak value of the motor back-EMF is determined according to the motor speed and the corresponding relationship between the motor speed and the peak value of the motor back-EMF.

4. A method for regulating the voltage of a train traction circuit, characterized in that: Applied to a four-quadrant rectifier, the method comprises: receiving a first parameter modification instruction from a train control unit, wherein the first parameter modification instruction is used to instruct to modify a first target voltage adjustment value of the four-quadrant rectifier to a second target voltage adjustment value, wherein the second target voltage adjustment value is less than the first target voltage adjustment value; modifying the first target voltage adjustment value to a second target voltage adjustment value according to the first parameter modification instruction; The first real-time voltage value of the intermediate DC circuit is adjusted to a second real-time voltage value according to the second target voltage adjustment value.

5. The method according to claim 4, characterized in that In the step of adjusting the first real-time voltage value of the intermediate DC circuit to the second real-time voltage value according to the second target voltage adjustment value, the method further includes: receiving a second parameter modification instruction from a train control unit, wherein the second parameter modification instruction is used to instruct to modify the second target voltage adjustment value to the first target voltage adjustment value; modifying the second target voltage adjustment value to the first target voltage adjustment value according to the second parameter modification instruction; The second real-time voltage value is adjusted to a third real-time voltage value according to the first target voltage adjustment value.

6. A train traction circuit voltage regulator, characterized in that: Applied to train control units, including: An acquisition module, configured to acquire a first real-time voltage value of the intermediate DC circuit if a fault of the traction inverter is detected; A sending module is used to send a first parameter modification instruction to the four-quadrant rectifier if the first real-time voltage value is greater than the first target voltage adjustment value of the four-quadrant rectifier, and the first parameter modification instruction is used to indicate that the first target voltage adjustment value is modified to a second target voltage adjustment value, so that the four-quadrant rectifier adjusts the first real-time voltage value to a second real-time voltage value according to the second target voltage adjustment value, and the second target voltage adjustment value is less than the first target voltage adjustment value.

7. The device according to claim 6, characterized in that The device also includes: The acquisition module is also used to acquire the peak value of the motor back electromotive force; The sending module is also used to send a second parameter modification instruction to the four-quadrant rectifier if the peak value of the motor back electromotive force is less than the first target voltage adjustment value. The second parameter modification instruction is used to instruct to modify the second target voltage adjustment value to the first target voltage adjustment value, so that the four-quadrant rectifier can adjust the second real-time voltage value to a third real-time voltage value according to the first target voltage adjustment value.

8. A train traction circuit voltage regulator, characterized in that: Applications in four-quadrant rectifiers include: a receiving module, configured to receive a first parameter modification instruction from a train control unit, wherein the first parameter modification instruction is used to instruct to modify a first target voltage adjustment value of the four-quadrant rectifier to a second target voltage adjustment value, wherein the second target voltage adjustment value is less than the first target voltage adjustment value; a modification module, configured to modify the first target voltage adjustment value to a second target voltage adjustment value according to the first parameter modification instruction; The adjustment module is used to adjust the first real-time voltage value of the intermediate DC circuit to a second real-time voltage value according to the second target voltage adjustment value.

9. A computer device, characterized in that: include: Memory, processor, and bus system; Wherein, the memory is used to store programs; The processor is used to execute the program in the memory to implement the method according to any one of claims 1 to 3, or to implement the method according to claim 4 or 5; The bus system is used to connect the memory and the processor so that the memory and the processor can communicate with each other.

10. A computer-readable storage medium, characterized in that: Instructions are stored, which, when executed on a computer, cause the computer to execute the method according to any one of claims 1 to 3, or the method according to claim 4 or 5.

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