WO2024077732A1

WO2024077732A1 - Temperature simulation method and apparatus for traction system

Info

Publication number: WO2024077732A1
Application number: PCT/CN2022/134715
Authority: WO
Inventors: 陈天宇; 王磊; 王旨; 刁利军
Original assignee: 中车长春轨道客车股份有限公司
Priority date: 2022-10-12
Filing date: 2022-11-28
Publication date: 2024-04-18
Also published as: CN115422780A

Abstract

A temperature simulation method and apparatus for a traction system. The method comprises: obtaining driving condition information and operation feature information of an electric locomotive (S101); determining a traction network voltage and a traction torque of a traction system in the electric locomotive on the basis of the driving condition information and the operation feature information (S102); and on the basis of the traction network pressure and the traction torque of the traction system, determining temperature feature information of the traction system corresponding to the driving condition information by using a simulation model that simulates the traction system (S103). Thus, the temperatures of a traction motor of the electric locomotive under target driving conditions can be obtained.

Description

Temperature simulation method and device for traction system

This application claims priority to a Chinese patent application filed with the Chinese Patent Office on October 12, 2022, with application number 202211245623.6 and invention name “Temperature simulation method and device for traction system”, the entire contents of which are incorporated by reference in this application.

Technical Field

The present application relates to the field of simulation technology, and in particular to a temperature simulation method and device for a traction system.

Background technique

With the continuous development of electric locomotives in my country, the types of line conditions that electric locomotives can be used for are increasing.

When an electric locomotive runs on some complex line conditions (such as high-altitude lines or long slopes, etc.), the traction motor of the electric locomotive may heat up too much, and the temperature increase of the traction motor will affect the traction force generated by the traction motor. Based on this, determining the temperature characteristics of the traction motor under different driving conditions plays an important role in the reasonable control of the operation of the electric locomotive.

Summary of the invention

The present application provides a temperature simulation method and device for a traction system, so as to obtain the temperature condition of a traction motor of an electric locomotive under a target driving condition.

In one aspect, the present application provides a temperature simulation method for a traction system, comprising:

Obtaining driving condition information and operation characteristic information of electric locomotive;

Determining the traction network voltage and traction torque of the traction system in the electric locomotive based on the driving condition information and the operation characteristic information;

Based on the traction network pressure and the traction torque of the traction system, the temperature characteristic information of the traction system corresponding to the driving condition information is determined by using a simulation model simulating the traction system.

In a possible implementation, determining the traction network voltage and traction torque of the traction system in the electric locomotive based on the driving condition information and the operation characteristic information includes:

Determine the traction network voltage and traction torque of the traction system based on target parameter values of device parameters set in the traction system of the electric locomotive, the driving condition information, and the operation characteristic information;

The determining of the temperature characteristic information of the traction system corresponding to the driving condition information based on the traction grid pressure and the traction torque of the traction system and using a simulation model simulating the traction system comprises:

Based on the traction grid pressure and traction torque of the traction system, using a simulation model simulating the traction system, obtaining parameter values of various temperature-related temperature-affecting parameters in the traction system;

Determining temperature characteristic information of the traction system corresponding to the driving condition information based on parameter values of each temperature influencing parameter;

Determining a simulation parameter value of the specified device parameter in the traction system based on the temperature characteristic information;

If the traction network voltage, traction torque and the temperature characteristic information determined for the most recent setting time have not converged, taking the simulation parameter value of the designated device parameter as the target parameter value of the designated device parameter, returning to execute the operation of determining the traction network voltage and traction torque of the traction system and determining the temperature characteristic information, until the traction network voltage, traction torque and the temperature characteristic information determined for the most recent setting time converge;

The most recently determined temperature characteristic information is determined as the temperature characteristic information of the traction system under the driving condition information.

In yet another possible implementation, after obtaining the driving condition information and the operating characteristic information of the electric locomotive, the method further includes:

Obtaining initial parameter values of specified device parameters in the traction system at a set reference temperature;

An initial parameter value of the designated device parameter is determined as a target parameter value of the designated device parameter.

In another possible implementation, the traction system includes at least: a traction motor and a transformer corresponding to the traction motor;

The method of obtaining the parameter values of various temperature-related temperature-affecting parameters in the traction system based on the traction grid pressure and traction torque of the traction system by using a simulation model simulating the traction system includes:

Based on the traction grid voltage and traction torque of the traction system, a transformer simulation module simulating a transformer in the traction system and a motor simulation module simulating the traction motor are used to simulate a simulated input current and a simulated input voltage of the traction motor;

The determining, based on the parameter values of the temperature-affecting parameters, the temperature characteristic information of the traction system corresponding to the driving condition information comprises:

Based on the operation characteristic information, traction torque, simulated input current and simulated input voltage of the traction motor, first temperature characteristic information of the traction motor corresponding to the driving condition information is determined.

In another possible implementation, while simulating the simulated input current and the simulated input voltage of the traction motor, the method further includes:

Simulating a simulated output current and a simulated output voltage of the transformer;

The determining, based on the parameter values of the temperature-affecting parameters, the temperature characteristic information of the traction system corresponding to the driving condition information further includes:

Based on the traction grid voltage, the simulated output current and the simulated output voltage of the transformer, second temperature characteristic information of the transformer corresponding to the driving condition information is determined.

In another possible implementation, the specified device parameters include: equivalent loss of the transformer; resistance of the transformer, stator resistance of the traction motor, rotor resistance of the traction motor, magnetic induction of the traction motor, magnetic core loss of the traction motor, magnetic induction of the transformer, and magnetic core loss of the transformer;

The determining, based on the temperature characteristic information, a simulation parameter value of the specified device parameter in the traction system includes at least one of the following:

Based on the first temperature characteristic information, determining a first simulated resistance value of a stator resistor, a second simulated resistance value of a rotor resistor, a first magnetic induction intensity and a first magnetic core loss degree of the traction motor;

Based on the second temperature characteristic information, a simulated resistance value of the transformer, a simulated value of the equivalent loss, a second magnetic induction intensity and a second magnetic core loss degree of the transformer are determined.

In another aspect, the present application further provides a temperature simulation device for a traction system, comprising:

A working condition information determination unit, used to obtain the driving working condition information and operation characteristic information of the electric locomotive;

a traction data determination unit, configured to determine a traction network voltage and a traction torque of a traction system in the electric locomotive based on the driving condition information and the operation characteristic information;

The temperature simulation unit is used to determine the temperature characteristic information of the traction system corresponding to the driving condition information based on the traction network pressure and the traction torque of the traction system and by using a simulation model simulating the traction system.

In a possible implementation, the traction data determining unit includes:

A traction data determination subunit, configured to determine a traction network voltage and a traction torque of the traction system based on target parameter values of device parameters set in the traction system of the electric locomotive, the driving condition information, and the operation characteristic information;

The temperature simulation unit comprises:

A traction simulation subunit, configured to obtain parameter values of various temperature-related temperature-affecting parameters in the traction system based on the traction grid pressure and traction torque of the traction system and by using a simulation model simulating the traction system;

an intermediate temperature determination subunit, configured to determine temperature characteristic information of the traction system corresponding to the driving condition information based on parameter values of various temperature influencing parameters;

a parameter value determination subunit, configured to determine a simulation parameter value of the specified device parameter in the traction system based on the temperature characteristic information;

a loop control unit, for, if the traction network voltage, traction torque and temperature characteristic information determined for the most recent setting time have not converged, using the simulation parameter value of the designated device parameter as the target parameter value of the designated device parameter, and returning to execute the operation of determining the traction network voltage and traction torque of the traction system and determining the temperature characteristic information, until the traction network voltage, traction torque and temperature characteristic information determined for the most recent setting time converge;

The final temperature determination subunit is used to determine the temperature characteristic information determined most recently as the temperature characteristic information of the traction system under the driving condition information.

In yet another possible implementation, the method further includes:

An initial parameter obtaining unit, configured to obtain initial parameter values of designated device parameters in the traction system at a set reference temperature after the operating condition information obtaining unit obtains the driving operating condition information and operation characteristic information of the electric locomotive;

The target parameter confirmation unit is used to determine the initial parameter value of the specified device parameter as the target parameter value of the specified device parameter.

The traction simulation subunit comprises:

a simulation confirmation subunit, configured to simulate a simulated input current and a simulated input voltage of the traction motor based on a traction grid voltage and a traction torque of the traction system by using a transformer simulation module simulating a transformer in the traction system and a motor simulation module simulating the traction motor;

The intermediate temperature determination subunit comprises:

The first temperature determination subunit is used to determine first temperature characteristic information of the traction motor corresponding to the driving condition information based on the operation characteristic information, traction torque, simulated input current and simulated input voltage of the traction motor.

As can be seen from the above, in the embodiment of the present application, a simulation model for simulating the traction system is constructed. On this basis, after the traction network voltage and traction torque of the traction system of the electric locomotive are determined based on the driving condition information and operation characteristic information of the electric locomotive, the operation status of the traction system is simulated based on the traction network voltage and traction torque using the simulation model simulating the traction system, so that the temperature characteristic information corresponding to the operation status under the driving condition information and operation characteristic information of the traction system can be finally simulated, which provides a reference basis for reasonably controlling the traction motor under the driving condition and operation characteristic information.

BRIEF DESCRIPTION OF THE DRAWINGS

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

FIG1 shows a schematic flow chart of a temperature simulation method for a traction system provided in an embodiment of the present application;

FIG2 shows another schematic flow chart of a temperature simulation method for a traction system provided in an embodiment of the present application;

FIG3 shows a schematic diagram of a simulation model of a traction system provided in an embodiment of the present application;

FIG. 4 shows a schematic diagram of a composition structure of a temperature simulation device for a traction system provided in an embodiment of the present application.

Detailed ways

The solution of the present application can be applied to various electric locomotives that use traction motors to provide traction. The solution of the present application can simulate the temperature change characteristics of the traction motors under different driving conditions and operating characteristic information as needed.

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

As shown in FIG. 1 , it shows a flow chart of a temperature simulation method for a traction system provided in an embodiment of the present application. The method of this embodiment can be applied to electronic devices, such as computer equipment or control equipment in electric locomotives.

The method of this embodiment may include:

S101, obtaining driving condition information and operation characteristic information of the electric locomotive.

The driving condition information may represent the line condition and running speed information of the electric locomotive. The line condition may include the mileage, slope and turning radius of the electric locomotive. The running speed information may include the running speed of the electric locomotive at different mileages.

The operation characteristic information of the electric locomotive may represent information on the operation characteristics of the electric locomotive. For example, the operation characteristic information may include the value or characteristics of at least one of the traction torque and the braking torque corresponding to different operating speeds.

The driving condition information can be set according to the simulation requirements. For example, the line condition can be provided by the line designer, and the running speed information in the driving condition information can generally be provided by the operator of the electric locomotive. The running characteristic information is a characteristic related to the electric locomotive, which can be related to the specific model of the electric locomotive, etc., and can be provided by the manufacturer of the electric locomotive.

S102, determining the traction network voltage and traction torque of the traction system in the electric locomotive based on the driving condition information and the operation characteristic information.

The traction system of an electric locomotive refers to a system including a traction motor of the electric locomotive and used to provide traction force. Accordingly, the traction system of an electric locomotive at least includes a traction motor of the electric locomotive.

It is understandable that the operation of the traction motor requires the input of voltage and current, etc. Therefore, in addition to the traction motor, the traction system may also include a power conversion module required for the operation of the traction motor. For example, the traction system also includes a transformer corresponding to the traction motor. The transformer may be integrated with a rectifier. For example, the traction system may include a rectifier, an inverter, and a traction motor.

The traction torque may be the output torque of a traction motor in the traction system of an electric locomotive.

Traction grid voltage refers to the grid voltage of the traction system, such as the voltage that needs to be input to the traction system through the DC bus in the electric locomotive.

It is understandable that, when the driving condition information and the operating characteristic information of the electric locomotive are determined, any currently used traction calculation method can be used to calculate the traction torque of the traction motor in the electric locomotive. After the traction torque is calculated, the traction network voltage can be further calculated in combination with the driving condition information and the operating characteristic information.

It is understandable that in most cases, it may be necessary to analyze information such as the traction torque and temperature changes of the traction motor of the electric locomotive under a section of route conditions and operating conditions. Therefore, the driving condition information obtained in this application can characterize the line conditions under a section of line and the operating speed curve that characterizes the operating speeds corresponding to different mileages.

In this case, the present application can calculate the traction torque of the traction system based on the driving condition information and the operation characteristic information, which may include a traction torque sequence, and the traction torque sequence may include the traction torque at different mileage positions corresponding to the driving condition information (such as the motor locomotive operation line). Of course, when the operating speed corresponding to different mileages is determined, the time corresponding to different mileage positions can be determined, so that the traction torque corresponding to different times can be converted.

Correspondingly, the traction network pressure may be a traction network pressure sequence, and the traction network pressure sequence may include: traction network pressures at different mileage positions (or at different times) corresponding to the driving condition information.

S103, based on the traction network pressure and traction torque of the traction system, using a simulation model simulating the traction system, determining temperature characteristic information of the traction system corresponding to the driving condition information.

The simulation model of the traction system may be a simulation module constructed to simulate the traction system. For example, a simulation program of the traction system may be constructed based on a computer language (such as C language, etc.) and in combination with a specific simulation tool.

The simulation model can be used to simulate the operation of the traction system under the traction grid pressure and traction torque. Based on the operation results of the traction system simulated by the simulation system and the temperature simulation calculation, the temperature characteristic information of the traction system can be obtained.

It can be understood that, under the premise that the driving condition information includes the line conditions at different mileage positions, the temperature characteristic information can include the temperature of the traction system at different mileage positions involved in the driving condition information. For example, the temperature characteristic information can be a temperature change curve corresponding to different mileage positions. Of course, the temperature characteristic information can also be converted into a temperature change curve containing temperatures corresponding to different times.

For example, based on the traction grid pressure and traction torque of the traction system, a simulation model simulating the traction system can be used to obtain the parameter values of each temperature-related temperature-affecting parameter in the simulated traction system. Accordingly, based on the parameter values of each temperature-affecting parameter, the temperature characteristic information of the traction system corresponding to the driving condition information is determined.

In the present application, the temperature characteristic information of the traction system at least includes the temperature characteristic information of the traction motor, and may also include the temperature characteristic information of the traction motor.

It is understandable that during the operation of the electric locomotive, the traction motor will continuously adjust some parameters of some related components as its temperature changes. Based on this, the traction voltage, traction torque and temperature of the traction motor of the traction system will affect each other. It can be seen that if the temperature characteristic information of the traction system is obtained by simulation based only on the traction grid voltage and traction torque obtained in one round of calculation, it may be inaccurate.

In order to further improve the accuracy of the determined temperature characteristic information of the traction system, the present application also needs to continuously repeat the iterative calculation of the traction network pressure and traction torque based on the calculated temperature characteristic information of the traction system until the traction network pressure, traction torque and temperature characteristic information of the traction system reach stability, that is, converge.

A possible implementation is described below.

As shown in FIG2 , it shows another flow chart of the temperature simulation method of the traction system provided in an embodiment of the present application. The method of this embodiment may include:

S201, obtaining driving condition information and operation characteristic information of the electric locomotive.

For this step, please refer to the related introduction of the previous embodiment, which will not be repeated here.

S202, obtaining initial parameter values of designated device parameters in the traction system at a set reference temperature.

The traction system at least includes: a traction motor and a transformer corresponding to the traction motor.

The specified device parameters may be related device parameters in the traction system that can affect the traction torque and the traction grid voltage. The specified device parameters may include multiple parameters.

For example, the specified device parameters include: equivalent loss of the transformer in the traction system; resistance of the transformer, stator resistance of the traction motor, rotor resistance of the traction motor, magnetic parameters of the traction motor, and magnetic parameters of the transformer, or some or all of them. The magnetic parameters may include magnetic induction and magnetic core loss.

The reference temperature may be a preset default temperature. It is understandable that, due to the different temperatures of the traction motor and the transformer in the traction system, some parameters such as resistance in the traction motor and the transformer will also change accordingly. Based on this, the present application may first use the temperature as the reference temperature to determine the parameter value of the specified device parameter in the traction system, and the parameter value determined at this time is called the initial parameter value.

S203: Determine the initial parameter value of the designated device parameter as the target parameter value of the designated device parameter.

It should be noted that the above steps S202 and S203 are merely an example of an implementation method for determining the target parameter value of a specified device parameter. In actual applications, the initial parameter values of various specified device parameters can also be set in advance without the need for calculation in step S202. Of course, other methods of obtaining the initial parameter values of the specified device parameters are also possible, and there is no limitation on this.

S204, determining the traction network voltage and traction torque of the traction system based on the target parameter values of the device parameters set in the traction system of the electric locomotive, the driving condition information and the operation characteristic information.

It can be understood that when the parameter values of the relevant set device parameters in the traction motor and transformer in the traction system are determined, the traction network voltage and traction torque can be determined by combining the driving condition information and the operating characteristic information with any traction calculation algorithm.

This application does not impose any restrictions on the specific implementation process of calculating the traction network pressure and traction torque.

S205 , based on the traction grid pressure and traction torque of the traction system, using a simulation model simulating the traction system, obtaining parameter values of various temperature-influencing parameters related to temperature in the simulated traction system.

The simulation model of the traction system can be found in the previous introduction.

In a possible implementation, the simulation model of the traction system may include at least: a transformer simulation module simulating a transformer in the traction system and a motor simulation module simulating the traction motor.

It can be understood that the transformer in the traction system can be included in the rectifier, as shown in FIG3 , which shows a schematic diagram of a composition architecture of a simulation model of the traction system.

As can be seen from FIG. 3 , the simulation model of the traction system may include a constructed simulation module of a rectifier, a simulation module of an inverter, and a simulation module of a traction motor.

Among them, the AC power can be input into the simulation module of the rectifier. Combined with the input voltage and input current of the rectifier, the output voltage and output current of the transformer contained in the rectifier can be obtained based on the simulation module of the rectifier. On this basis, the simulation module of the rectifier can simulate the process of converting AC power into DC power. The DC power output by the simulation module of the rectifier will be converted into the required AC power through the inverter, and the AC power output by the simulation module of the inverter will be input into the simulation module of the traction motor.

It can be understood that the temperature characteristic information that needs to be calculated in the present application needs to include at least the temperature characteristic information of the traction motor. In this case, the temperature-related temperature influencing parameters in the traction system include at least the input current and input voltage of the traction motor obtained based on the simulation module. For the sake of ease of distinction, the simulated input current is referred to as the simulated input current, and the simulated input voltage is referred to as the simulated input voltage.

Specifically, based on the traction grid voltage and traction torque of the traction system, a transformer simulation module simulating the transformer in the traction system and a motor simulation module simulating the traction motor can be used to simulate the simulated input current and simulated input voltage of the traction motor.

If the temperature characteristic information also includes the temperature characteristic information of the transformer, then based on the traction grid voltage and traction torque of the traction system, the simulated output current and simulated output voltage of the transformer can be simulated by using a transformer simulation module that simulates the transformer in the traction system and a motor simulation module that simulates the traction motor.

S206: Determine temperature characteristic information of the traction system corresponding to the driving condition information based on the parameter value of each temperature influencing parameter.

For example, the first temperature characteristic information of the traction motor under the driving condition information may be determined based on the operating characteristic information, traction torque, simulated input current, and simulated input voltage of the traction motor.

Furthermore, the second temperature characteristic information of the transformer corresponding to the driving condition information may be determined based on the traction grid voltage, the simulated output current and the simulated output voltage of the transformer.

It can be understood that the first temperature characteristic information and the second temperature characteristic information may both be: temperature change curves or temperature change information respectively including temperatures corresponding to different mileage positions.

Among them, the calculation of the first temperature characteristic information and the second temperature characteristic can be achieved using a pre-built temperature simulation calculation model. As shown in Figure 3, the simulation model of the engine system is also connected to a simulation calculation model for calculating the temperature change of the transformer and a simulation calculation model for calculating the temperature change of the traction motor. The specific calculation process is not restricted.

S207: Determine simulation parameter values of designated device parameters in the traction system based on the temperature characteristic information.

The specified device parameters involved here can refer to the relevant introduction of the previous embodiment.

In one possible case, when the temperature characteristic information includes the first temperature characteristic information of the front traction motor, the first simulated resistance value of the stator resistance of the traction motor, the second simulated resistance value of the rotor resistance, the first magnetic induction intensity and the first magnetic core loss degree of the traction motor can be determined based on the first temperature characteristic information.

It can be understood that when the first temperature characteristic information includes multiple temperatures corresponding to different mileage positions, it is necessary to respectively determine the second simulated resistance value of the stator resistance of the traction motor, the second simulated resistance value of the rotor resistance, the first magnetic induction intensity and the first magnetic core loss degree corresponding to different temperatures.

For the sake of distinction, the resistance value of the stator resistance determined in step S207 is referred to as a first simulation resistance value, and the resistance value of the rotor resistance determined is referred to as a second simulation resistance value.

In another possible situation, on the premise that the temperature characteristic information includes the second temperature characteristic information of the transformer, the simulated resistance value of the transformer in the traction system, the simulated value of the equivalent loss, the second magnetic induction intensity and the second magnetic core loss degree of the transformer can be determined based on the second temperature characteristic information.

In particular, when the second temperature characteristic information includes multiple temperatures, it is necessary to determine the simulated resistance value of the transformer, the simulated value of the equivalent loss, and the simulated value of the magnetic parameter at different temperatures respectively.

S208, detect whether the traction network voltage, traction torque and temperature characteristic information determined based on the most recent setting times have converged. If so, execute step S209; if not, use the simulation parameter value of the specified device parameter as the target parameter value of the specified device parameter, and return to execute step S204.

The setting times can be set as needed.

It can be understood that after continuous iterations, the traction network pressure, traction torque and temperature characteristic information determined by the traction system can converge, so that the final temperature characteristic information can accurately characterize the temperature characteristic information of the traction system under the driving condition information.

S209: Determine the most recently determined temperature characteristic information as the temperature characteristic information of the traction system under the driving condition information.

By combining the temperature characteristic information of the traction system with the solution of the present application, the traction torque and traction network pressure of the traction system are continuously iteratively calculated, and the temperature characteristic information of the traction system is continuously updated based on the updated traction network pressure and traction torque, so that the temperature characteristic information finally determined can accurately reflect the temperature condition of the traction system under the driving condition.

Corresponding to a temperature simulation method of a traction system of the present application, the present application also provides a temperature simulation device.

As shown in FIG. 4 , it shows a schematic diagram of a structure of a temperature simulation device for a traction system provided in an embodiment of the present application. The device of this embodiment may include:

The operating condition information determination unit 401 is used to obtain the driving condition information and operation characteristic information of the electric locomotive;

A traction data determination unit 402, configured to determine a traction grid voltage and a traction torque of a traction system in the electric locomotive based on the driving condition information and the operation characteristic information;

The temperature simulation unit 403 is used to determine the temperature characteristic information of the traction system corresponding to the driving condition information based on the traction network pressure and the traction torque of the traction system and by using a simulation model simulating the traction system.

In a possible implementation, the traction data determining unit includes:

The temperature simulation unit comprises:

In yet another possible implementation, the device further includes:

The traction simulation subunit comprises:

The intermediate temperature determination subunit comprises:

In another possible implementation, the simulation confirmation subunit is further configured to simulate the simulated output current and the simulated output voltage of the transformer while simulating the simulated input current and the simulated input voltage of the traction motor;

The intermediate temperature determination subunit further includes:

The second temperature determination subunit is used to determine the second temperature characteristic information of the transformer corresponding to the driving condition information based on the traction grid voltage, the simulated output current and the simulated output voltage of the transformer.

The parameter value determination subunit includes at least one of the following:

A first parameter value determination subunit is used to determine a first simulated resistance value of a stator resistance of the traction motor, a second simulated resistance value of a rotor resistance, a first magnetic induction intensity and a first magnetic core loss degree of the traction motor based on the first temperature characteristic information;

The second parameter value determination subunit is used to determine the simulated resistance value, the simulated value of the equivalent loss, the second magnetic induction intensity and the second magnetic core loss degree of the transformer based on the second temperature characteristic information.

It should be noted that each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the embodiments can be referred to each other. At the same time, the features recorded in each embodiment in this specification can be replaced or combined with each other, so that professionals in the field can implement or use this application. For device embodiments, since they are basically similar to method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

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", "comprises" 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, an element defined by the sentence "comprises a..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. 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 application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

A temperature simulation method for a traction system, characterized by comprising:

Obtaining driving condition information and operation characteristic information of electric locomotive;

Determining the traction network voltage and traction torque of the traction system in the electric locomotive based on the driving condition information and the operation characteristic information;

Based on the traction network pressure and the traction torque of the traction system, the temperature characteristic information of the traction system corresponding to the driving condition information is determined by using a simulation model simulating the traction system.
The method according to claim 1 is characterized in that the step of determining the traction network voltage and traction torque of the traction system in the electric locomotive based on the driving condition information and the operation characteristic information comprises:

Determine the traction network voltage and traction torque of the traction system based on target parameter values of device parameters set in the traction system of the electric locomotive, the driving condition information, and the operation characteristic information;

The determining of the temperature characteristic information of the traction system corresponding to the driving condition information based on the traction grid pressure and the traction torque of the traction system and using a simulation model simulating the traction system comprises:

Based on the traction grid pressure and traction torque of the traction system, using a simulation model simulating the traction system, obtaining parameter values of various temperature-related temperature-affecting parameters in the traction system;

Determining temperature characteristic information of the traction system corresponding to the driving condition information based on parameter values of each temperature influencing parameter;

Determining a simulation parameter value of the specified device parameter in the traction system based on the temperature characteristic information;

If the traction network voltage, traction torque and the temperature characteristic information determined for the most recent setting time have not converged, taking the simulation parameter value of the designated device parameter as the target parameter value of the designated device parameter, returning to execute the operation of determining the traction network voltage and traction torque of the traction system and determining the temperature characteristic information, until the traction network voltage, traction torque and the temperature characteristic information determined for the most recent setting time converge;

The most recently determined temperature characteristic information is determined as the temperature characteristic information of the traction system under the driving condition information.
The method according to claim 2 is characterized in that, after obtaining the driving condition information and operation characteristic information of the electric locomotive, it also includes:

Obtaining initial parameter values of specified device parameters in the traction system at a set reference temperature;

An initial parameter value of the designated device parameter is determined as a target parameter value of the designated device parameter.
The method according to claim 2, characterized in that the traction system comprises at least: a traction motor and a transformer corresponding to the traction motor;

The method of obtaining the parameter values of various temperature-related temperature-affecting parameters in the traction system based on the traction grid pressure and traction torque of the traction system by using a simulation model simulating the traction system includes:

Based on the traction grid voltage and traction torque of the traction system, a transformer simulation module simulating a transformer in the traction system and a motor simulation module simulating the traction motor are used to simulate a simulated input current and a simulated input voltage of the traction motor;

The determining, based on the parameter values of the temperature-affecting parameters, the temperature characteristic information of the traction system corresponding to the driving condition information comprises:

Based on the operation characteristic information, traction torque, simulated input current and simulated input voltage of the traction motor, first temperature characteristic information of the traction motor corresponding to the driving condition information is determined.
The method according to claim 4, characterized in that, while simulating the simulated input current and the simulated input voltage of the traction motor, it also includes:

Simulating a simulated output current and a simulated output voltage of the transformer;

The determining, based on the parameter values of the temperature-affecting parameters, the temperature characteristic information of the traction system corresponding to the driving condition information further includes:

Based on the traction grid voltage, the simulated output current and the simulated output voltage of the transformer, second temperature characteristic information of the transformer corresponding to the driving condition information is determined.
The method according to claim 5, characterized in that the specified device parameters include: equivalent loss of the transformer, resistance of the transformer, stator resistance of the traction motor, rotor resistance of the traction motor, magnetic induction of the traction motor, magnetic core loss of the traction motor, magnetic induction of the transformer and magnetic core loss of the transformer;

The determining, based on the temperature characteristic information, a simulation parameter value of the specified device parameter in the traction system includes at least one of the following:

Based on the first temperature characteristic information, determining a first simulated resistance value of a stator resistor, a second simulated resistance value of a rotor resistor, a first magnetic induction intensity and a first magnetic core loss degree of the traction motor;

Based on the second temperature characteristic information, a simulated resistance value of the transformer, a simulated value of the equivalent loss, a second magnetic induction intensity and a second magnetic core loss degree of the transformer are determined.
A temperature simulation device for a traction system, characterized by comprising:

A working condition information determination unit, used to obtain the driving working condition information and operation characteristic information of the electric locomotive;

A traction data determination unit, used to determine the traction network voltage and traction torque of the traction system in the electric locomotive based on the driving condition information and the operation characteristic information;

The temperature simulation unit is used to determine the temperature characteristic information of the traction system corresponding to the driving condition information based on the traction network pressure and the traction torque of the traction system and by using a simulation model simulating the traction system.
The device according to claim 7, characterized in that the traction data determination unit comprises:

A traction data determination subunit, configured to determine a traction network voltage and a traction torque of the traction system based on target parameter values of device parameters set in the traction system of the electric locomotive, the driving condition information, and the operation characteristic information;

The temperature simulation unit comprises:

A traction simulation subunit, configured to obtain parameter values of various temperature-related temperature-affecting parameters in the traction system based on the traction grid pressure and traction torque of the traction system and by using a simulation model simulating the traction system;

an intermediate temperature determination subunit, configured to determine temperature characteristic information of the traction system corresponding to the driving condition information based on parameter values of various temperature influencing parameters;

a parameter value determination subunit, configured to determine a simulation parameter value of the specified device parameter in the traction system based on the temperature characteristic information;

a loop control unit, for, if the traction network voltage, traction torque and temperature characteristic information determined for the most recent setting time have not converged, using the simulation parameter value of the designated device parameter as the target parameter value of the designated device parameter, and returning to execute the operation of determining the traction network voltage and traction torque of the traction system and determining the temperature characteristic information, until the traction network voltage, traction torque and temperature characteristic information determined for the most recent setting time converge;

The final temperature determination subunit is used to determine the temperature characteristic information determined most recently as the temperature characteristic information of the traction system under the driving condition information.
The device according to claim 8, further comprising:

An initial parameter obtaining unit, configured to obtain initial parameter values of designated device parameters in the traction system at a set reference temperature after the operating condition information obtaining unit obtains the driving operating condition information and operation characteristic information of the electric locomotive;

The target parameter confirmation unit is used to determine the initial parameter value of the specified device parameter as the target parameter value of the specified device parameter.
The device according to claim 8, characterized in that the traction system comprises at least: a traction motor and a transformer corresponding to the traction motor;

The traction simulation subunit comprises:

a simulation confirmation subunit, configured to simulate a simulated input current and a simulated input voltage of the traction motor based on a traction grid voltage and a traction torque of the traction system by using a transformer simulation module simulating a transformer in the traction system and a motor simulation module simulating the traction motor;

The intermediate temperature determination subunit comprises:

The first temperature determination subunit is used to determine first temperature characteristic information of the traction motor corresponding to the driving condition information based on the operation characteristic information, traction torque, simulated input current and simulated input voltage of the traction motor.