Dynamic simulation test platform suitable for superconducting linear motor

Abstract

The invention relates to the technical field of superconducting linear motors, and discloses a dynamic simulation test platform suitable for a superconducting linear motor. The platform comprises a power grid, a traction converter system, a traction power supply system, a ground load and a dynamic simulation test device, the power grid is used for providing electric energy to supply power to the traction converter system and the dynamic simulation test device, and the traction converter system is used for outputting electric energy to the traction power supply system according to a voltage control signal issued by a traction control system. The traction power supply system introduces input electric energy into the ground load according to a power supply control signal issued by the traction control system, the ground load is a stator section of the superconducting linear motor, and the dynamic simulation test device calculates the current back electromotive force of the superconducting linear motor according to the current speed and position information of the superconducting linear motor. The calculated current back electromotive force is modulated and then output to a ground load, and the ground load feeds back the operation state to the traction control system.

Description

Technical Field

[0001] The present invention relates to the technical field of superconducting linear motors, and particularly to a dynamic simulation test platform applicable to superconducting linear motors. Background Art

[0002] With the development of rail transit, the operating speed and transportation capacity of traditional rail transit can no longer meet the growing social needs. Ultra-high-speed maglev trains have received extensive attention due to their advantages in operating at high speeds. The operating speed of ultra-high-speed maglev trains exceeds 1000 km / h, and the control technology of ultra-high-speed superconducting linear motors is particularly crucial.

[0003] When an ultra-high-speed maglev train operates on a track, the ground traction converter equipment supplies power to the stator section of the linear motor and generates a traveling magnetic field, which drives the train to run. The traction control system adjusts the output voltage of the converter according to the current operating state of the train, and controls the frequency, phase, and amplitude of the output current to make the train run according to the planned trajectory.

[0004] The dynamic simulation device can simulate the actual equipment under various operating conditions and fault states through a real-time digital simulation device, and connect with the actual operating equipment to ensure the reliable operation of the control protection and control strategies on site.

[0005] Since the mover of the superconducting linear motor uses a superconducting magnet, if each test is carried out with a superconducting magnet, many operating conditions of the actual train operation have high requirements for the test site, wasting a large amount of manpower, material resources, consumables, and time. Moreover, the system safety of untested is relatively low and cannot achieve the test purpose. Summary of the Invention

[0006] The present invention provides a dynamic simulation test platform applicable to superconducting linear motors, which can solve the technical problems in the prior art.

[0007] The present invention provides a dynamic simulation test platform applicable to superconducting linear motors. The platform includes a power grid, a traction conversion system, a traction power supply system, a ground load, and a dynamic simulation test device. The power grid is used to provide electrical energy to supply power to the traction conversion system and the dynamic simulation test device. The traction conversion system is used to output electrical energy to the traction power supply system according to the voltage control signal issued by the traction control system. The traction power supply system introduces the input electrical energy into the ground load according to the power supply control signal issued by the traction control system, where the ground load is the stator section of the superconducting linear motor. The dynamic simulation test device calculates the current back electromotive force of the superconducting linear motor according to the current speed and position information of the superconducting linear motor, modulates the calculated current back electromotive force, and then outputs it to the ground load. The ground load feeds back the operating state to the traction control system.

[0008] Preferably, the traction power supply system includes a substation beside the track, and the substation beside the track performs switching-on and switching-off actions according to the power supply control signal to introduce the input electric energy into the ground load.

[0009] Preferably, the traction conversion system includes an input transformer, a first rectifier, a first DC support capacitor, and a first inverter connected in sequence.

[0010] Preferably, the dynamic simulation test device includes a controller and power equipment. The controller is connected to the traction control system. The controller calculates the current speed and position information of the superconducting linear motor according to the operating state output by the traction control system, and calculates the current back electromotive force of the superconducting linear motor according to the current speed and position information of the superconducting linear motor. The power equipment modulates the calculated current back electromotive force and outputs it to the ground load.

[0011] Preferably, the power equipment includes a voltage regulator, a second rectifier, a second DC support capacitor, and a second inverter connected in sequence.

[0012] Preferably, the current back electromotive force of the superconducting linear motor is calculated by the following formula:

[0013] e = f(v, x, y, z, θ x , θ y , θ z ),

[0014] where e is the current back electromotive force, v is the train running speed, x is the displacement in the train propulsion direction, y is the displacement in the train levitation direction, z is the displacement in the train guiding direction, and θ x , θ y , θ z is the deviation angle of the train in each direction.

[0015] Through the above technical solutions, the magnetic flux coupling relationship between the stator and the mover of the superconducting linear motor can be simulated, that is, the induced electromotive force generated by the change of the superconducting magnet magnetic flux on the stator section. The dynamic simulation test device can simulate the actual operation of the superconducting linear motor under various working conditions. At the same time, the dynamic simulation test device can be connected to the actual traction conversion system and traction power supply system to more truly reflect the influence of the operation state of the superconducting linear motor on the power equipment. Using this dynamic simulation test platform for testing can verify the accuracy and effectiveness of the actual application of the traction control strategy and verify the operation reliability of each power equipment. Before the formal application of the superconducting magnet, the experimental cost can be reduced and the technical risks of each equipment can be released in advance. Brief Description of the Drawings

[0016] The accompanying drawings included are used to provide a further understanding of the embodiments of the present invention, which form a part of the specification, illustrate the embodiments of the present invention, and, together with the written description, explain the principles of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0017] Figure 1 Shows an application architecture diagram of a moving die test platform according to an embodiment of the present invention;

[0018] Figure 2 Shows a circuit connection diagram of a moving die test platform according to an embodiment of the present invention;

[0019] Figure 3 Shows a block diagram of a moving die test device according to an embodiment of the present invention. Detailed implementation manners

[0020] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments may be combined with each other. The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, rather than all, embodiments of the present invention. The following description of at least one exemplary embodiment is actually only illustrative and in no way restricts the present invention and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0021] It should be noted that the terms used herein are only for describing the specific implementation manners and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0022] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be regarded as part of the authorized specification. In all the examples shown and discussed here, any specific values should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, further discussion thereof is not required in subsequent drawings.

[0023] Figure 1 The application architecture diagram of the moving model test platform according to an embodiment of the present invention is shown.

[0024] Among them, the moving model test platform can be applied to the superconducting linear motor of the ultra-high-speed maglev train.

[0025] As Figure 1 shown, the embodiment of the present invention provides a moving model test platform applicable to a superconducting linear motor. Among them, the platform includes a power grid, a traction converter system, a traction power supply system, a ground load, and a moving model test device (superconducting linear motor moving model device). The power grid is used to provide electrical energy to supply power to the traction converter system and the moving model test device. The traction converter system is used to output electrical energy to the traction power supply system according to the voltage control signal issued by the traction control system (output the corresponding voltage to the traction power supply system). The traction power supply system introduces the input electrical energy into the ground load according to the power supply control signal issued by the traction control system (that is, introduces the electrical energy output by the traction converter system into the ground load). The ground load is the stator section of the superconducting linear motor. The moving model test device calculates the current back electromotive force of the superconducting linear motor according to the current speed and position information of the superconducting linear motor, and after modulating the calculated current back electromotive force, outputs it into the ground load. The ground load feeds back the operating state to the traction control system.

[0026] Among them, as the stator section of the superconducting linear motor, the ground load can reflect the operating conditions of the actual operating ground stator section.

[0027] Through the above technical solution, the magnetic flux coupling relationship between the stator and the mover of the superconducting linear motor can be simulated, that is, the induced electromotive force generated by the change of the magnetic flux of the superconducting magnet on the stator section. This dynamic simulation test device can simulate the actual operation of the superconducting linear motor under various working conditions. At the same time, this dynamic simulation test device can be connected to the actual traction converter system and traction power supply system to more realistically reflect the impact of the operation state of the superconducting linear motor on power equipment. Using this dynamic simulation test platform for testing can verify the accuracy and effectiveness of the actual application of the traction control strategy and verify the operation reliability of each power equipment. Before the formal application of the superconducting magnet, the experimental cost can be reduced and the technical risks of each equipment can be released in advance.

[0028] According to an embodiment of the present invention, the traction power supply system includes a substation beside the track. The substation beside the track performs opening and closing actions according to the power supply control signal (for example, switch command) to introduce the input electric energy into the ground load.

[0029] Wherein, the traction power supply system further includes a cable for line connection.

[0030] According to an embodiment of the present invention, as Figure 2 shown, the traction converter system includes an input transformer 10, a first rectifier 12, a first DC support capacitor 14, and a first inverter (DC / AC) 16 connected in sequence.

[0031] Wherein, the electric energy provided by the power grid is processed by the input transformer 10, the first rectifier 12, the first DC support capacitor 14, and the first inverter (DC / AC) 16 in sequence and then outputs the corresponding voltage to the traction power supply system.

[0032] According to an embodiment of the present invention, as Figure 3 shown, the dynamic simulation test device includes a controller and power equipment. The controller is connected to the traction control system (for data communication). The controller calculates the current speed and position information of the superconducting linear motor according to the operation state output by the traction control system, and calculates the current back electromotive force of the superconducting linear motor according to the current speed and position information of the superconducting linear motor. The power equipment modulates the calculated current back electromotive force and then outputs it to the ground load.

[0033] That is to say, the power equipment can modulate the current back electromotive force and then output the corresponding voltage to the ground load.

[0034] For example, an IGBT drive signal can be generated according to the current back electromotive force, and then the corresponding voltage can be output.

[0035] According to an embodiment of the present invention, as Figure 2As shown, the power device includes a voltage regulator 20, a second rectifier 22, a second DC support capacitor 24, and a second inverter (DC / AC) 26 that are connected in sequence.

[0036] Among them, the calculated back electromotive force is modulated and processed by the voltage regulator 20, the second rectifier 22, the second DC support capacitor 24, and the second inverter (DC / AC) 26 in sequence, and then the corresponding voltage is output to the ground load.

[0037] According to an embodiment of the present invention, the current back electromotive force of the superconducting linear motor is calculated by the following formula:

[0038] e = f(v, x, y, z, θ x , θ y , θ z ),

[0039] where e is the current back electromotive force, v is the train running speed, x is the displacement in the train propulsion direction, y is the displacement in the train levitation direction, z is the train guiding displacement, and θ x , θ y , θ z is the offset angle of the train in each direction (i.e., the offset angle of the train in the propulsion direction, the offset angle of the train in the levitation direction, and the offset angle of the train in the guiding direction).

[0040] Next, the test method of the dynamic simulation test platform applicable to the superconducting linear motor according to the present invention will be described with reference to examples.

[0041] Among them, the test method includes:

[0042] Step 1: Connect the communication signals of the control system. Connect the internal controllers and communication interfaces of each sensor of each power device to the traction control system. After the wiring is completed, check whether the communication is normal. After checking for no faults, proceed with the subsequent tests.

[0043] Step 2: Conduct joint debugging tests on the control system functions. After checking that the communication signals are correct, conduct control function debugging to determine whether each power device can execute corresponding actions according to the instructions of the traction control system.

[0044] Step 3: Wire the power devices. Electrically connect each power device according to the architecture diagram and the internal wiring diagram of the device. After checking for no errors, it is ready for high-voltage tests.

[0045] Step 4: Power on the power devices. Introduce grid electrical energy into the traction conversion system and the power devices of the dynamic simulation test device. When each system is ready, formal tests can be carried out.

[0046] Step 5: The formal test begins. The traction control system issues control commands to systems such as the traction converter system and the substation switchyard. The traction converter system outputs electrical energy, which is transmitted to the ground load (equipment) through the substation switchyard. At the same time, each ground load feeds back its operating status to the traction control system to form a closed-loop control. The dynamic simulation test device calculates the speed and position information of the linear motor based on the current operating status of the ground load, and then calculates the back electromotive force. By modulating the back electromotive force, the power equipment of the dynamic simulation device can output the corresponding voltage for the test.

[0047] The voltage and current relationships of each device during the test are as follows:

[0048]

[0049] Among them, u is the output voltage of the traction converter system, i is the current of the traction converter system, R1 is the resistance of the traction power supply system line, R2 is the resistance of the ground load, L1 is the inductance of the traction power supply system line, and L2 is the inductance of the ground load.

[0050] The electromagnetic thrust calculation of the superconducting linear motor is as follows:

[0051] P = e a i a + e b i b + e c i c

[0052] P = F e v

[0053] Among them, e a , e b , e c is the back electromotive force of the motor, i a , i b , i c are the three-phase currents of the motor, P is the output active power, Fe is the output electromagnetic thrust, and v is the train running speed.

[0054] The motion equation of the superconducting linear motor is as follows:

[0055] (v, x, y, z, θ x , θ y , θ z ) = f(Fe, v', x', y', z', θ x ', θ y , θ z ')

[0056] Among them, v', x', y', z', θ x , θ y , θ z' is the state of the train at the previous moment.

[0057] Step 6: The test ends. Collect and determine the test operation data and conduct data analysis. After meeting the test conditions, power off the system.

[0058] As can be seen from the above embodiments, the dynamic simulation test platform for superconducting linear motors according to the present invention can simulate the magnetic flux relationship between the superconducting linear motor and the ground stator section during actual operation under various working conditions. This dynamic simulation test device is connected to the real traction control system, traction converter system, traction power supply system, and ground load, and can more realistically reflect the influence of the operating state of the superconducting linear motor on power equipment. Before the application of the superconducting magnet, the reliability and safety of the operation of other high-voltage power equipment can be verified to the greatest extent, and at the same time, the correctness and effectiveness of the control and protection strategies of the traction control system under the actual operating conditions of the power equipment can be verified, which can effectively reduce the huge costs generated by repeated tests of the superconducting magnet and release the technical risks of each device in advance.

[0059] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom" is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description. Without contrary instructions, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the protection scope of the present invention; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0060] For the convenience of description, spatial relative terms such as "above...", "above...", "on the upper surface of...", "above" can be used here to describe the spatial positional relationship between a device or feature shown in the figure and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the figure for the device. For example, if the device in the figure is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "under other devices or structures" afterwards. Thus, the exemplary term "above..." can include both the orientation of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding explanations are made for the spatial relative descriptions used here.

[0061] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Without additional declaration, the above terms have no special meaning, and therefore should not be construed as a limitation on the protection scope of the present invention.

[0062] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A dynamic simulation test platform applicable to a superconducting linear motor, characterized in that, the platform includes a power grid, a traction converter system, a traction power supply system, a ground load, and a dynamic simulation test device. The power grid is used to provide electrical energy to supply power to the traction converter system and the dynamic simulation test device. The traction converter system is used to output electrical energy to the traction power supply system according to a voltage control signal issued by a traction control system. The traction power supply system introduces the input electrical energy into the ground load according to a power supply control signal issued by the traction control system, where the ground load is a stator section of the superconducting linear motor. The dynamic simulation test device calculates the current back electromotive force of the superconducting linear motor based on the current speed and position information of the superconducting linear motor, and outputs the calculated current back electromotive force to the ground load after modulation. The ground load feeds back the operating state to the traction control system.

2. The platform according to claim 1, characterized in that, the traction power supply system includes a substation beside the track. The substation beside the track performs switching-on and switching-off actions according to the power supply control signal to introduce the input electrical energy into the ground load.

3. The platform according to claim 2, characterized in that, the traction converter system includes an input transformer, a first rectifier, a first DC support capacitor, and a first inverter connected in sequence.

4. The platform according to claim 3, characterized in that, the dynamic simulation test device includes a controller and a power device. The controller is connected to the traction control system. The controller calculates the current speed and position information of the superconducting linear motor based on the operating state output by the traction control system, and calculates the current back electromotive force of the superconducting linear motor based on the current speed and position information of the superconducting linear motor. The power device outputs the calculated current back electromotive force to the ground load after modulation.

5. The platform according to claim 4, characterized in that, the power device includes a voltage regulator, a second rectifier, a second DC support capacitor, and a second inverter connected in sequence.

6. The platform according to claim 5, characterized in that, the current back electromotive force of the superconducting linear motor is calculated by the following formula: e = f(v, x, y, z, θ x , θ y , θ z ), where e is the current back electromotive force, v is the train running speed, x is the displacement in the train propulsion direction, y is the displacement in the train levitation direction, z is the displacement in the train guiding direction, and θ x , θ y , θ z are the offset angles of the train in each direction.

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