Method for evaluating multi-field coupling performance of traction transformer digital twin system

Abstract

The invention discloses a traction transformer digital twinning system multi-field coupling performance evaluation method, which comprises the following steps: acquiring the rated capacity and rated operation current of an actual operation traction transformer according to an operation environment, and generating an equal-proportion traction transformer model by using a traction transformer digital twinning system, a traction transformer multi-physical field test platform with an adjustable environment temperature is constructed, hot-spot temperature rise and average magnetic flux density of the traction transformer under stable operation at different primary side currents and different environment temperatures are tested, so that a multi-field deviation factor is calculated and determined, and then a multi-field coupling performance evaluation factor is determined. And finally evaluating the multi-field coupling performance of the digital twin system of the traction transformer. According to an actual operation environment, the multi-field coupling performance of the traction transformer digital twin system can be accurately evaluated, and a certain basis is provided for selection and evaluation of the traction power supply equipment digital twin system.

Description

Technical Field

[0001] The present invention belongs to the field of system performance testing and evaluation, and specifically relates to a method for evaluating the multi-field coupling performance of a traction transformer digital twin system. Background Art

[0002] As the core power supply equipment of the traction power supply system, the traction transformer is the power source of the train. Its safe and reliable operation is related to the stability of the entire traction power supply system. The digital twin system takes the increasingly huge data in various fields as the basic element. With the help of rapidly developing advanced technologies such as modeling and simulation, artificial intelligence, and virtual reality, it constructs the digital twin of the physical entity in the virtual space, realizes the digital control and optimization of the physical entity, and opens up a feasible idea for the digital transformation of enterprises. In the field of traction power supply, the development of the digital twin system can also bring many benefits and innovations. In recent years, with the rapid development of digitalization, intelligence, and informatization, digital twins have accelerated their implementation and become one of the core technologies of industrial digitalization. The application of digital twin technology on traction transformers has also increased, such as real-time monitoring and diagnosis, performance optimization, simulation training, remote operation and maintenance, resource management, design improvement, etc. Therefore, it is very necessary to reasonably evaluate the various performances of the traction transformer digital twin system. However, there is currently a lack of effective evaluation methods for the multi-field coupling performance of the traction transformer digital twin system. Therefore, there is an urgent need for an evaluation method for the multi-field coupling performance of the traction transformer digital twin system. Summary of the invention

[0003] In view of the above technical problems, the purpose of the present invention is to propose a method for evaluating the multi-field coupling performance of a traction transformer digital twin system, which can effectively evaluate the multi-field coupling performance of a traction transformer digital twin system, and is characterized in that it includes the following steps:

[0004] 1. A method for evaluating the multi-field coupling performance of a traction transformer digital twin system, comprising the following steps:

[0005] Step 1: Obtain transformer and environmental operating parameters;

[0006] According to the operation records, the actual average operating ambient temperature of the traction transformer is obtained, which is recorded as T n , the unit is K; according to the operation record, the actual operating traction transformer primary side rated current is obtained, recorded as I n , the unit is A; input the rated operating parameters of the actual traction transformer into the traction transformer digital twin system to generate a proportional traction transformer model;

[0007] Step 2: Build a multi-physics field test platform;

[0008] The multi-physics field test platform comprises a computer terminal (1), a right temperature controller (2), a left temperature controller (3), a simulation power supply (4), a current regulating device (5), a controllable temperature test chamber (6), a traction transformer system (7), a left external magnetic flux density measuring instrument (8), a left external temperature sensor (9), a lower external temperature sensor (10), a lower external magnetic flux density measuring instrument (11), a right external magnetic flux density measuring instrument (12), a right external temperature sensor (13), an upper external magnetic flux density measuring instrument (14), an upper external temperature sensor (15), a left internal temperature sensor (16), a left internal magnetic flux density measuring instrument (17), a lower internal temperature sensor (18), a lower internal magnetic flux density measuring instrument (19), a right internal magnetic flux density measuring instrument (20), a right internal temperature sensor (21), an upper internal magnetic flux density measuring instrument (22), and an upper internal temperature sensor (23);

[0009] The traction transformer system (7) is connected to the simulation power supply (4), which is in turn connected to the computer terminal (1); the traction transformer system (7) is provided with a current regulating device (5) connected to the computer terminal (1) to provide a fast and stable test current; the traction transformer system (7) is provided with a right temperature controller (2) and a left temperature controller (3) connected to the computer terminal (1) to provide a fast and stable test environment temperature; the traction transformer system (7) is provided with a left external temperature sensor (9), a lower external temperature sensor (10), a right external temperature sensor (13), an upper external temperature sensor (15), and a left internal temperature sensor (16) which are interconnected and connected to the computer terminal (1). The temperature sensor (16), the lower internal temperature sensor (18), the right internal temperature sensor (21), and the upper internal temperature sensor (23) realize the hot spot temperature rise monitoring of the traction transformer; the traction transformer system (7) is provided with a left external magnetic flux density measuring instrument (8), a lower external magnetic flux density measuring instrument (11), a right external magnetic flux density measuring instrument (12), an upper external magnetic flux density measuring instrument (14), a left internal magnetic flux density measuring instrument (17), a lower internal magnetic flux density measuring instrument (19), a right internal magnetic flux density measuring instrument (20), and an upper internal magnetic flux density measuring instrument (22) which are interconnected and connected to the computer terminal (1) to realize the magnetic flux density monitoring of the traction transformer;

[0010] Step 3: Determine the multi-field deviation factor δ of the actual traction transformer under different temperature and primary current environments m ;

[0011] 1) Set the primary current to I n , the unit is A; set 5 uniformly increasing test environment temperatures, recorded as T1, T2, T3, T4, T5, the unit is K, where T1 = 0.8Tn , T2=0.9T n , T3=T n , T4=1.1T n , T5=1.2T n ; Record the hot spot temperature rise of the actual traction transformer under stable operation at different test environment temperatures, recorded as Δt i , i = 1, 2, 3, 4, 5, the unit is K; record the actual average flux density of the traction transformer under stable operation at different test ambient temperatures, recorded as Δb i , i=1,2,3,4,5, unit is T;

[0012] 2) Set the test environment temperature to T n , the unit is K; set 5 evenly increasing primary side current values, recorded as I1, I2, I3, I4, I5, the unit is A, where I1 = 0.8I n , I2=0.9I n , I3=I n , I4=1.1I n , I5=1.2I n ; Record the hot spot temperature rise of the actual traction transformer under stable operation of different primary side currents, recorded as Δt j , j = 1, 2, 3, 4, 5, the unit is K; record the actual average flux density of the traction transformer under stable operation of different primary side currents, recorded as Δb j , j = 1, 2, 3, 4, 5, the unit is T;

[0013] The multi-field deviation factor δ of the actual traction transformer under different ambient temperatures and different primary current environments is obtained by formula (1): m :

[0014]

[0015] Step 4: Determine the multi-field deviation factor δ of the proportional traction transformer generated by the traction transformer digital twin system under different temperatures and different primary current environments n ;

[0016] 1) Set the primary current to I n , the unit is A; set 5 uniformly increasing test environment temperatures, recorded as T1, T2, T3, T4, T5, the unit is K, where T1 = 0.8T n , T2=0.9T n , T3=T n , T4=1.1T n , T5=1.2T n ; Record the hot spot temperature rise of the proportional traction transformer under stable operation at different test environment temperatures, recorded as ΔT i, i = 1, 2, 3, 4, 5, the unit is K; record the average magnetic flux density of the proportional traction transformer under stable operation at different test environment temperatures, recorded as ΔB i , i=1,2,3,4,5, unit is T;

[0017] 2) Set the test environment temperature to T n , the unit is K; set 5 evenly increasing primary side current values, recorded as I1, I2, I3, I4, I5, the unit is A, where I1 = 0.8I n , I2=0.9I n , I3=I n , I4=1.1I n , I5=1.2I n ; Record the hot spot temperature rise of the proportional traction transformer under stable operation of different primary side currents, recorded as ΔT j , j = 1, 2, 3, 4, 5, the unit is K; record the average magnetic flux density of the proportional traction transformer under stable operation of different primary side currents, recorded as ΔB j , j = 1, 2, 3, 4, 5, the unit is T;

[0018] The multi-field deviation factor δ of the proportional traction transformer generated by the traction transformer digital twin system under different ambient temperatures and different primary current environments is obtained by formula (2): n :

[0019]

[0020] Step 5: Determine the multi-field coupling performance evaluation factor η of the traction transformer digital twin system est ;

[0021] The multi-field coupling performance evaluation factor η of the traction transformer digital twin system is calculated by formula (3): est :

[0022]

[0023] Step 6: Evaluate the multi-field coupling performance of the traction transformer digital twin system;

[0024] According to formula (3), the multi-field coupling performance of the traction transformer digital twin system is evaluated. If 0.9≤η est ≤1.1 indicates that the multi-field coupling performance of the traction transformer digital twin system is excellent; if 0.8≤η est <0.9 or 1.1<η est ≤1.2 means that the multi-field coupling performance of the traction transformer digital twin system is medium; if 0<η est <0.8 or η est>1.2 means that the multi-field coupling performance of the traction transformer digital twin system is poor and needs to be improved.

[0025] The beneficial effect of the present invention is that it takes into account the actual application of the traction transformer digital twin system, proposes a method for evaluating the multi-field coupling performance of the traction transformer digital twin system, and provides a certain basis for the selection and evaluation of the digital twin system of traction power supply equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It represents the constructed multi-physics test platform;

[0027] Figure 2 It shows a flow chart of a method for evaluating the multi-field coupling performance of a traction transformer digital twin system. DETAILED DESCRIPTION

[0028] The present invention is further described below in conjunction with the accompanying drawings and specific implementation processes; it should be emphasized that the specific implementation cases described herein are only used to explain the present invention and do not limit the scope of the present invention and its claims; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings are omitted. A method for evaluating the multi-field coupling performance of a traction transformer digital twin system comprises the following steps:

[0029] Step 1: Obtain transformer and environmental operating parameters;

[0030] According to the operation records, the actual average operating ambient temperature of the traction transformer is obtained, which is recorded as T n , the unit is K; according to the operation record, the actual operating traction transformer primary side rated current is obtained, recorded as I n , the unit is A; input the rated operating parameters of the actual traction transformer into the traction transformer digital twin system to generate a proportional traction transformer model;

[0031] Step 2: Build a multi-physics field test platform;

[0032] The multi-physics field test platform comprises a computer terminal (1), a right temperature controller (2), a left temperature controller (3), a simulation power supply (4), a current regulating device (5), a controllable temperature test chamber (6), a traction transformer system (7), a left external magnetic flux density measuring instrument (8), a left external temperature sensor (9), a lower external temperature sensor (10), a lower external magnetic flux density measuring instrument (11), a right external magnetic flux density measuring instrument (12), a right external temperature sensor (13), an upper external magnetic flux density measuring instrument (14), an upper external temperature sensor (15), a left internal temperature sensor (16), a left internal magnetic flux density measuring instrument (17), a lower internal temperature sensor (18), a lower internal magnetic flux density measuring instrument (19), a right internal magnetic flux density measuring instrument (20), a right internal temperature sensor (21), an upper internal magnetic flux density measuring instrument (22), and an upper internal temperature sensor (23);

[0033] The traction transformer system (7) is connected to the simulation power supply (4), which is in turn connected to the computer terminal (1); the traction transformer system (7) is provided with a current regulating device (5) connected to the computer terminal (1) to provide a fast and stable test current; the traction transformer system (7) is provided with a right temperature controller (2) and a left temperature controller (3) connected to the computer terminal (1) to provide a fast and stable test environment temperature; the traction transformer system (7) is provided with a left external temperature sensor (9), a lower external temperature sensor (10), a right external temperature sensor (13), an upper external temperature sensor (15), and a left internal temperature sensor (16) which are interconnected and connected to the computer terminal (1). The temperature sensor (16), the lower internal temperature sensor (18), the right internal temperature sensor (21), and the upper internal temperature sensor (23) realize the hot spot temperature rise monitoring of the traction transformer; the traction transformer system (7) is provided with a left external magnetic flux density measuring instrument (8), a lower external magnetic flux density measuring instrument (11), a right external magnetic flux density measuring instrument (12), an upper external magnetic flux density measuring instrument (14), a left internal magnetic flux density measuring instrument (17), a lower internal magnetic flux density measuring instrument (19), a right internal magnetic flux density measuring instrument (20), and an upper internal magnetic flux density measuring instrument (22) which are interconnected and connected to the computer terminal (1) to realize the magnetic flux density monitoring of the traction transformer;

[0034] Step 3: Determine the multi-field deviation factor δ of the actual traction transformer under different temperature and primary current environments m ;

[0035] 1) Set the primary current to I n , the unit is A; set 5 uniformly increasing test environment temperatures, recorded as T1, T2, T3, T4, T5, the unit is K, where T1 = 0.8Tn , T2=0.9T n , T3=T n , T4=1.1T n , T5=1.2T n ; Record the hot spot temperature rise of the actual traction transformer under stable operation at different test environment temperatures, recorded as Δt i , i = 1, 2, 3, 4, 5, the unit is K; record the actual average flux density of the traction transformer under stable operation at different test ambient temperatures, recorded as Δb i , i=1,2,3,4,5, unit is T;

[0036] 2) Set the test environment temperature to T n , the unit is K; set 5 evenly increasing primary side current values, recorded as I1, I2, I3, I4, I5, the unit is A, where I1 = 0.8I n , I2=0.9I n , I3=I n , I4=1.1I n , I5=1.2I n ; Record the hot spot temperature rise of the actual traction transformer under stable operation of different primary side currents, recorded as Δt j , j = 1, 2, 3, 4, 5, the unit is K; record the actual average flux density of the traction transformer under stable operation of different primary side currents, recorded as Δb j , j = 1, 2, 3, 4, 5, the unit is T;

[0037] The multi-field deviation factor δ of the actual traction transformer under different ambient temperatures and different primary current environments is obtained by formula (1): m :

[0038]

[0039] Step 4: Determine the multi-field deviation factor δ of the proportional traction transformer generated by the traction transformer digital twin system under different temperatures and different primary current environments n ;

[0040] 1) Set the primary current to I n , the unit is A; set 5 uniformly increasing test environment temperatures, recorded as T1, T2, T3, T4, T5, the unit is K, where T1 = 0.8T n , T2=0.9T n , T3=T n , T4=1.1T n , T5=1.2T n ; Record the hot spot temperature rise of the proportional traction transformer under stable operation at different test environment temperatures, recorded as ΔT i, i = 1, 2, 3, 4, 5, the unit is K; record the average magnetic flux density of the proportional traction transformer under stable operation at different test environment temperatures, recorded as ΔB i , i=1,2,3,4,5, unit is T;

[0041] 2) Set the test environment temperature to T n , the unit is K; set 5 evenly increasing primary side current values, recorded as I1, I2, I3, I4, I5, the unit is A, where I1 = 0.8I n , I2=0.9I n , I3=I n , I4=1.1I n , I5=1.2I n ; Record the hot spot temperature rise of the proportional traction transformer under stable operation of different primary side currents, recorded as ΔT j , j = 1, 2, 3, 4, 5, the unit is K; record the average magnetic flux density of the proportional traction transformer under stable operation of different primary side currents, recorded as ΔB j , j = 1, 2, 3, 4, 5, the unit is T;

[0042] The multi-field deviation factor δ of the proportional traction transformer generated by the traction transformer digital twin system under different ambient temperatures and different primary current environments is obtained by formula (2): n :

[0043]

[0044] Step 5: Determine the multi-field coupling performance evaluation factor η of the traction transformer digital twin system est ;

[0045] The multi-field coupling performance evaluation factor η of the traction transformer digital twin system is calculated by formula (3): est :

[0046]

[0047] Step 6: Evaluate the multi-field coupling performance of the traction transformer digital twin system;

[0048] According to formula (3), the multi-field coupling performance of the traction transformer digital twin system is evaluated. If 0.9≤η est ≤1.1 indicates that the multi-field coupling performance of the traction transformer digital twin system is excellent; if 0.8≤η est <0.9 or 1.1<η est ≤1.2 means that the multi-field coupling performance of the traction transformer digital twin system is medium; if 0<η est <0.8 or η est>1.2 means that the multi-field coupling performance of the traction transformer digital twin system is poor and needs to be improved.

[0049] The beneficial effect of the present invention is that it takes into account the actual application of the traction transformer digital twin system, proposes a method for evaluating the multi-field coupling performance of the traction transformer digital twin system, and provides a certain basis for the selection and evaluation of the digital twin system of traction power supply equipment.

Claims

1. A method for evaluating the multi-field coupling performance of a traction transformer digital twin system, characterized in that: The following steps are involved: Step 1: Obtain transformer and environmental operating parameters; According to the operation records, the actual average operating ambient temperature of the traction transformer is obtained, which is recorded as T n , the unit is K; according to the operation record, the actual operating traction transformer primary side rated current is obtained, recorded as I n , the unit is A; input the rated operating parameters of the actual traction transformer into the traction transformer digital twin system to generate a proportional traction transformer model; Step 2: Build a multi-physics field test platform; The multi-physics field test platform comprises a computer terminal (1), a right temperature controller (2), a left temperature controller (3), a simulation power supply (4), a current regulating device (5), a controllable temperature test chamber (6), a traction transformer system (7), a left external magnetic flux density measuring instrument (8), a left external temperature sensor (9), a lower external temperature sensor (10), a lower external magnetic flux density measuring instrument (11), a right external magnetic flux density measuring instrument (12), a right external temperature sensor (13), an upper external magnetic flux density measuring instrument (14), an upper external temperature sensor (15), a left internal temperature sensor (16), a left internal magnetic flux density measuring instrument (17), a lower internal temperature sensor (18), a lower internal magnetic flux density measuring instrument (19), a right internal magnetic flux density measuring instrument (20), a right internal temperature sensor (21), an upper internal magnetic flux density measuring instrument (22), and an upper internal temperature sensor (23); The traction transformer system (7) is connected to the simulation power supply (4), which is in turn connected to the computer terminal (1); the traction transformer system (7) is provided with a current regulating device (5) connected to the computer terminal (1) to provide a fast and stable test current; the traction transformer system (7) is provided with a right temperature controller (2) and a left temperature controller (3) connected to the computer terminal (1) to provide a fast and stable test environment temperature; the traction transformer system (7) is provided with a left external temperature sensor (9), a lower external temperature sensor (10), a right external temperature sensor (13), an upper external temperature sensor (15), and a left internal temperature sensor (16) which are interconnected and connected to the computer terminal (1). The temperature sensor (16), the lower internal temperature sensor (18), the right internal temperature sensor (21), and the upper internal temperature sensor (23) realize the hot spot temperature rise monitoring of the traction transformer; the traction transformer system (7) is provided with a left external magnetic flux density measuring instrument (8), a lower external magnetic flux density measuring instrument (11), a right external magnetic flux density measuring instrument (12), an upper external magnetic flux density measuring instrument (14), a left internal magnetic flux density measuring instrument (17), a lower internal magnetic flux density measuring instrument (19), a right internal magnetic flux density measuring instrument (20), and an upper internal magnetic flux density measuring instrument (22) which are interconnected and connected to the computer terminal (1) to realize the magnetic flux density monitoring of the traction transformer; Step 3: Determine the multi-field deviation factor δ of the actual traction transformer under different temperature and primary current environments m ; 1) Set the primary current to I n , the unit is A; set 5 uniformly increasing test environment temperatures, recorded as T1, T2, T3, T4, T5, the unit is K, where T1 = 0.8T n , T2=0.9T n , T3=T n , T4=1.1T n , T5=1.2T n ; Record the hot spot temperature rise of the actual traction transformer under stable operation at different test environment temperatures, recorded as Δt i , i = 1, 2, 3, 4, 5, the unit is K; record the actual average flux density of the traction transformer under stable operation at different test ambient temperatures, recorded as Δb i , i=1,2,3,4,5, unit is T; 2) Set the test environment temperature to T n , the unit is K; set 5 evenly increasing primary side current values, recorded as I1, I2, I3, I4, I5, the unit is A, where I1 = 0.8I n , I2=0.9I n , I3=I n , I4=1.1I n , I5=1.2I n ; Record the hot spot temperature rise of the actual traction transformer under stable operation of different primary side currents, recorded as Δt j , j = 1, 2, 3, 4, 5, the unit is K; record the actual average flux density of the traction transformer under stable operation of different primary side currents, recorded as Δb j , j = 1, 2, 3, 4, 5, the unit is T; The multi-field deviation factor δ of the actual traction transformer under different ambient temperatures and different primary current environments is obtained by formula (1): m : Step 4: Determine the multi-field deviation factor δ of the proportional traction transformer generated by the traction transformer digital twin system under different temperatures and different primary current environments n ; 1) Set the primary current to I n , the unit is A; set 5 uniformly increasing test environment temperatures, recorded as T1, T2, T3, T4, T5, the unit is K, where T1 = 0.8T n , T2=0.9T n , T3=T n , T4=1.1T n , T5=1.2T n ; Record the hot spot temperature rise of the proportional traction transformer under stable operation at different test environment temperatures, recorded as ΔT i , i = 1, 2, 3, 4, 5, the unit is K; record the average magnetic flux density of the proportional traction transformer under stable operation at different test environment temperatures, recorded as ΔB i , i=1,2,3,4,5, unit is T; 2) Set the test environment temperature to T n , the unit is K; set 5 evenly increasing primary side current values, recorded as I1, I2, I3, I4, I5, the unit is A, where I1 = 0.8I n , I2=0.9I n , I3=I n , I4=1.1I n , I5=1.2I n ; Record the hot spot temperature rise of the proportional traction transformer under stable operation of different primary side currents, recorded as ΔT j , j = 1, 2, 3, 4, 5, the unit is K; record the average magnetic flux density of the proportional traction transformer under stable operation of different primary side currents, recorded as ΔB j , j = 1, 2, 3, 4, 5, the unit is T; The multi-field deviation factor δ of the proportional traction transformer generated by the traction transformer digital twin system under different ambient temperatures and different primary current environments is obtained by formula (2): n : Step 5: Determine the multi-field coupling performance evaluation factor η of the traction transformer digital twin system est ; The multi-field coupling performance evaluation factor η of the traction transformer digital twin system is calculated by formula (3): est : Step 6: Evaluate the multi-field coupling performance of the traction transformer digital twin system; According to formula (3), the multi-field coupling performance of the traction transformer digital twin system is evaluated. If 0.9≤η est ≤1.1 indicates that the multi-field coupling performance of the traction transformer digital twin system is excellent; if 0.8≤η est <0.9 or 1.1<η est ≤1.2 means that the multi-field coupling performance of the traction transformer digital twin system is medium; if 0<η est <0.8 or η est >1.2 means that the multi-field coupling performance of the traction transformer digital twin system is poor and needs to be improved.

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