Pantograph-catenary discharge simulation method, system and equipment and storage medium

Abstract

The invention relates to the technical field of pantograph-catenary discharge simulation, and discloses a pantograph-catenary discharge simulation method, system and device and a storage medium, and the method comprises the steps: storing electric energy through an energy storage unit; the electric energy stored in the energy storage unit is inverted into single-phase alternating current through an inverter; boosting the inverted single-phase alternating current to a preset high voltage through a boosting transformer, and transmitting the single-phase alternating current to a contact line; and controlling the pantograph and the contact line to contact and separate according to preset frequency and amplitude, and generating discharge in a pantograph-catenary gap to simulate a pantograph-catenary off-line process. According to the invention, high-voltage large-current pantograph net discharge simulation is realized under limited power; the pantograph net discharge does not cause impact influence on the public power grid; and extra electromagnetic interference is avoided.

Description

Technical Field

[0001] This disclosure relates to the field of pantograph-catenary discharge simulation technology, specifically to a pantograph-catenary discharge simulation method, system, equipment and storage medium, and particularly to a laboratory high-voltage, high-current pantograph-catenary discharge simulation method. Background Technology

[0002] During train operation, the pantograph and overhead contact line may experience brief separation and contact due to unevenness or vibration of the contact line, a phenomenon known as "pantograph-catenary disconnection." This disconnection is accompanied by arcing and discharge phenomena. The arcing generates electromagnetic radiation, which can interfere with surrounding signaling, control, and communication equipment. Because studying the electromagnetic interference characteristics of pantograph-catenary disconnection in the field is difficult, it is necessary to build corresponding simulation devices for analysis and research in a laboratory. The voltage of the overhead contact line in my country's railways is 25kV, and the actual operating current of high-speed trains is several hundred amps. Based on a traction current of 200A, the power requirement is 5 MW. Conventional laboratories have a power supply capacity of several hundred kW. To simulate pantograph-catenary discharge in the laboratory, two methods are typically used: high-voltage low-current circuit discharge and low-voltage high-current circuit discharge. Figure 2 and Figure 3 As shown, high-voltage, low-current discharge is simulated by using a voltage regulator and a step-up transformer to increase the voltage, and then supplying power to the pantograph-catenary gap through a series current-limiting protection resistor. Low-voltage, high-current discharge is simulated by using a voltage regulator and a step-down transformer to decrease the voltage, and then supplying power to the pantograph-catenary gap at a lower voltage. In reality, both voltage and current affect the electromagnetic radiation characteristics of pantograph-catenary discharge, and neither low-voltage, high-current nor high-voltage, low-current discharge can accurately simulate the characteristics of high-voltage, high-current discharge.

[0003] In summary, the rated voltage of the overhead contact line is 25kV, and the current flowing through the pantograph exceeds 200A under normal operating conditions. Such high-voltage, high-current test conditions are generally difficult to achieve in the laboratory. In general scientific research, high-voltage low-current or low-voltage high-current testing devices are often used to study the offline characteristics of the pantograph and contact line. However, high-voltage low-current or low-voltage high-current methods cannot accurately simulate the actual operating conditions of high voltage and high current. Limited by the power supply capacity of the laboratory, it is difficult to directly simulate high-voltage and high-current operating conditions. Therefore, a pantograph-contact line discharge simulation method is proposed for the study of the offline electromagnetic interference characteristics of the pantograph and contact line, which has become an urgent problem to be solved. Summary of the Invention

[0004] This disclosure provides a method, system, device, and storage medium for simulating pantograph-catenary discharge, in order to solve or alleviate one or more of the above-mentioned technical problems in the prior art.

[0005] According to one aspect of this disclosure, a method for simulating pantograph-catenary discharge is provided, comprising: Electrical energy is stored through energy storage units; The electrical energy stored in the energy storage unit is converted into single-phase alternating current by an inverter; The single-phase AC power after inversion is stepped up to a preset high voltage by a step-up transformer and then transmitted to the contact line; The pantograph and contact wire are controlled to make contact and separate at a preset frequency and amplitude, generating discharge in the pantograph-catenary gap to simulate the pantograph-catenary disconnection process.

[0006] In one possible implementation, the energy storage unit includes a power supply, a rectifier charger, and a capacitor bank. The energy storage unit stores electrical energy, including: Three-phase AC power is supplied by a power source; The three-phase AC power is rectified into DC power by a rectifier charger to charge the capacitor bank.

[0007] In one possible implementation, the preset high voltage is 25kV.

[0008] In one possible implementation, the inverter is a single-phase inverter.

[0009] In one possible implementation, controlling the pantograph and contact wire to make and separate contact at a preset frequency and amplitude includes: The contact wire is driven to move by a pneumatic vibration device so that the pantograph and the contact wire can make and separate at a preset frequency and amplitude.

[0010] In one possible implementation, the pneumatic vibration device is connected to the contact wire via an insulated pull rod, and the vibration frequency and amplitude of the contact wire are controlled by adjusting the air pressure and air volume of the pneumatic vibration device.

[0011] In one possible implementation, the on / off state of the high-voltage circuit supplying power to the contact line is controlled by a circuit breaker located between the step-up transformer and the contact line.

[0012] In one possible implementation, an equivalent load is connected between the low-voltage end of the step-up transformer and the pantograph; When the pantograph separates from the contact wire and discharges, the discharge current returns to the low-voltage end of the step-up transformer after passing through the equivalent load of the pantograph, forming a discharge current loop.

[0013] According to one aspect of this disclosure, a pantograph-catenary discharge simulation system is provided, comprising a pantograph and a contact wire, and further comprising: Energy storage unit, used to store electrical energy; An inverter is used to convert the electrical energy stored in the energy storage unit into single-phase alternating current. A step-up transformer is used to step up the single-phase AC power after inversion to a preset high voltage and then deliver it to the contact wire. The control unit is used to control the pantograph and the contact wire to make contact and separate at a preset frequency and amplitude, and to generate discharge in the pantograph-catenary gap to simulate the pantograph-catenary disconnection process.

[0014] In one possible implementation, the energy storage unit includes a power supply, a rectifier charger, and a capacitor bank; The power supply is used to provide three-phase alternating current; A rectifier charger is used to rectify three-phase AC power into DC power to charge capacitor banks.

[0015] According to one aspect of this disclosure, an electronic device is provided, comprising: Processor and memory; The memory is used to store computer programs, and the processor calls the computer programs stored in the memory to execute the pantograph-catenary discharge simulation method described above.

[0016] According to one aspect of this disclosure, a computer-readable storage medium is provided, wherein a computer program is stored therein, which, when executed by a processor, enables the processor to perform the pantograph-catenary discharge simulation method described in any of the preceding claims.

[0017] This disclosure has the following beneficial effects: High-voltage, high-current pantograph-catenary discharge simulation under limited power supply: Long-term charging and short-term release are achieved through an energy storage system (capacitor bank), overcoming the limitations of laboratory power supply capacity.

[0018] Pantograph-catenary discharge will not impact the public power grid: the energy storage component isolates the discharge process from the power grid, avoiding the impact of high-power discharge on the power grid.

[0019] Additional electromagnetic interference was avoided: a pneumatic vibration device (instead of an electric device) was used to control the pantograph-catenary separation, eliminating the interference of electromagnetic radiation generated by the drive components themselves on the test results.

[0020] Details of one or more embodiments of this application are set forth in the following drawings and description. Other features and advantages of this application will become apparent from the accompanying drawings. It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not intended to limit this disclosure. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0022] Figure 1 This is a flowchart of a pantograph-catenary discharge simulation method according to an exemplary embodiment of the present invention; Figure 2 This is a schematic diagram of an existing high-voltage, low-current circuit; Figure 3 This is a schematic diagram of an existing low-voltage, high-current circuit; Figure 4 This is a schematic diagram of the overall structure of this exemplary embodiment; Figure 5 This is a block diagram of a pantograph-catenary discharge simulation system according to an exemplary embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of an electronic device according to an exemplary embodiment of the present invention. Detailed Implementation

[0023] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make this disclosure more comprehensive and complete, and to fully convey the concept of the example embodiments to those skilled in the art. The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a full understanding of embodiments of this disclosure. However, those skilled in the art will recognize that the technical solutions of this disclosure can be practiced with one or more of the specific details omitted, or other methods, components, apparatus, steps, etc., can be employed. In other instances, well-known technical solutions are not shown or described in detail to avoid obscuring various aspects of this disclosure.

[0024] Furthermore, the accompanying drawings are merely illustrative of this disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted. Some block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities may be implemented in software, in one or more hardware units or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0025] The flowchart shown in the attached diagram is merely an illustrative example and does not necessarily include all steps. For example, some steps may be broken down, while others may be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0026] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in a sequence other than those illustrated or described herein.

[0027] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such that a process, method, system, product, or device that includes a series of steps or sub-modules is not necessarily limited to those steps or sub-modules that are explicitly listed, but may include other steps or sub-modules that are not explicitly listed or that are inherent to such process, method, product, or device.

[0028] Figure 1 This is a flowchart of a pantograph-catenary discharge simulation method according to an exemplary embodiment of the present invention, as follows: Figure 1 As shown, an exemplary embodiment of this disclosure provides a method for simulating pantograph-catenary discharge, comprising: Electrical energy is stored through energy storage units; The electrical energy stored in the energy storage unit is converted into single-phase alternating current by an inverter; The single-phase AC power after inversion is stepped up to a preset high voltage by a step-up transformer and then transmitted to the contact line; The pantograph and contact wire are controlled to make contact and separate at a preset frequency and amplitude, generating discharge in the pantograph-catenary gap to simulate the pantograph-catenary disconnection process.

[0029] This embodiment presents a laboratory simulation method for high-voltage, high-current pantograph-catenary discharge, with the overall structure as follows: Figure 4 As shown.

[0030] Because the pantograph-catenary discharge time is short, requiring only short-term high-power output, a high-voltage power supply system was designed using energy storage and single-phase inverter boosting to meet the 5MW power output requirement of the test platform under low power capacity conditions in the laboratory. The entire system mainly includes a three-phase 380V power supply, a three-phase rectifier charger, capacitor banks, a single-phase inverter, a step-up transformer, circuit breakers, contact wires, a pantograph, a pneumatic vibration device, and equivalent loads.

[0031] The three-phase rectifier charger rectifies the three-phase 380V AC power into DC to charge the capacitor bank. The single-phase inverter inverts the DC power from the capacitor bank into single-phase AC power, which is then converted into 25kV single-phase AC high voltage by a step-up transformer and transmitted to the contact wire through a circuit breaker. The low-voltage end of the step-up transformer is connected to the pantograph end through an equivalent load. When the pantograph contacts the contact wire, the circuit is open; when the pantograph disconnects from the contact wire, the circuit is closed. A pneumatic vibration device is used to control the pantograph-catenary contact and separation, simulating pantograph-catenary disconnection caused by vibration during train operation. The pneumatic vibration device is connected to the contact wire through an insulated rod and can control the up-and-down vibration of the contact wire. The vibration frequency and amplitude can be controlled by adjusting the air pressure and volume of the pneumatic device.

[0032] This embodiment realizes the simulation of high-voltage, high-current pantograph-catenary discharge under limited power supply. Through the isolation of the energy storage system, the pantograph-catenary discharge will not have an impact on the public power grid.

[0033] Specifically, the energy storage unit includes a power supply, a rectifier charger, and a capacitor bank. The energy storage unit stores electrical energy, including: Three-phase AC power is supplied by a power source; The three-phase AC power is rectified into DC power by a rectifier charger to charge the capacitor bank.

[0034] In this embodiment, due to the addition of a capacitor bank energy storage stage, the capacitor bank can be charged and stored for a longer period of time using a lower power supply load. After the charging and energy storage is completed, the energy is released in a short time through an inverter, achieving high power output in a short time and realizing high voltage and high current pantograph-catenary discharge simulation.

[0035] Specifically, the preset high voltage is 25kV.

[0036] Specifically, the inverter is a single-phase inverter.

[0037] Specifically, controlling the pantograph and contact wire to make and separate contact at a preset frequency and amplitude includes: The contact wire is driven to move by a pneumatic vibration device so that the pantograph and the contact wire can make and separate at a preset frequency and amplitude.

[0038] Specifically, the pneumatic vibration device is connected to the contact wire via an insulated pull rod, and the vibration frequency and amplitude of the contact wire are controlled by adjusting the air pressure and air volume of the pneumatic vibration device.

[0039] Specifically, the circuit breaker controls the opening and closing of the high-voltage circuit supplying power to the contact line, and the circuit breaker is located between the step-up transformer and the contact line.

[0040] Specifically, an equivalent load is connected between the low-voltage end of the step-up transformer and the pantograph; When the pantograph separates from the contact wire and discharges, the discharge current returns to the low-voltage end of the step-up transformer after passing through the equivalent load of the pantograph, forming a discharge current loop.

[0041] In this embodiment, when pantograph-catenary discharge is required, the circuit breaker is closed to connect the high-voltage circuit, the pantograph contacts the contact wire, the pneumatic vibration device is activated, and the contact wire is pulled up and down by the insulating rod to control the contact wire to contact and separate from the pantograph at a certain frequency, thereby generating discharge in the pantograph-catenary gap. The advantage of using pneumatic control is that it avoids the additional electromagnetic radiation brought by electric motors from affecting the electromagnetic characteristics of pantograph-catenary discharge.

[0042] Figure 5 This is a block diagram of a pantograph-catenary discharge simulation system according to an exemplary embodiment of the present invention, as follows: Figure 5 As shown, an exemplary embodiment of this disclosure provides a pantograph-catenary discharge simulation system, including a pantograph and a contact wire, and further comprising: Energy storage unit, used to store electrical energy; An inverter is used to convert the electrical energy stored in the energy storage unit into single-phase alternating current. A step-up transformer is used to step up the single-phase AC power after inversion to a preset high voltage and then deliver it to the contact wire. The control unit is used to control the pantograph and the contact wire to make contact and separate at a preset frequency and amplitude, and to generate discharge in the pantograph-catenary gap to simulate the pantograph-catenary disconnection process.

[0043] Specifically, the energy storage unit includes a power supply, a rectifier charger, and a capacitor bank; The power supply is used to provide three-phase alternating current; A rectifier charger is used to rectify three-phase AC power into DC power to charge capacitor banks.

[0044] Figure 6 This is a schematic diagram of the structure of an electronic device according to an exemplary embodiment of this invention. Figure 6 As shown, corresponding to the pantograph-catenary discharge simulation method provided above, this disclosure also provides an electronic device. Since the embodiment of this device is similar to the above method embodiment, the description is relatively simple; relevant details can be found in the description of the above method embodiment section. The device described below is merely illustrative. This device may include: a processor 1, a memory 2, a communication bus (i.e., the aforementioned device bus), and a lookup engine. The processor 1 and memory 2 communicate with each other via the communication bus and communicate with external systems via a communication interface. The processor 1 can call logical instructions in the memory 2 to execute the pantograph-catenary discharge simulation method.

[0045] Furthermore, the logical instructions in the aforementioned memory 2 can be implemented as software functional units and sold or used as independent products, and can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this disclosure, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this disclosure. The aforementioned storage medium includes various media capable of storing program code, such as memory chips, USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0046] On the other hand, this disclosure also provides a processor-readable storage medium storing a computer program 3, which, when executed by a processor 1, is implemented to perform the pantograph-catenary discharge simulation method provided in the above embodiments.

[0047] The processor-readable storage medium can be any available medium or data storage device that the processor 1 can access, including but not limited to magnetic memory (e.g., floppy disk, hard disk, magnetic tape, magneto-optical disk (MO)), optical memory (e.g., CD, DVD, BD, HVD), and semiconductor memory (e.g., ROM, EPROM, EEPROM, non-volatile memory (NAND FLASH), solid-state drive (SSD)).

[0048] The above are merely preferred embodiments of this disclosure. The scope of protection of this disclosure is not limited to the above embodiments. All technical solutions falling within the scope of this disclosure are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of this disclosure should be considered within the scope of protection of this disclosure.

Claims

1. A method for simulating pantograph-catenary discharge, characterized in that, include: Electrical energy is stored through energy storage units; The electrical energy stored in the energy storage unit is converted into single-phase alternating current by an inverter; The single-phase AC power after inversion is stepped up to a preset high voltage by a step-up transformer and then transmitted to the contact line; The pantograph and contact wire are controlled to make contact and separate at a preset frequency and amplitude, generating discharge in the pantograph-catenary gap to simulate the pantograph-catenary disconnection process.

2. The pantograph-catenary discharge simulation method according to claim 1, characterized in that, The energy storage unit includes a power supply, a rectifier charger, and a capacitor bank. It stores electrical energy, including: Three-phase AC power is supplied by a power source. The three-phase AC power is rectified into DC power by a rectifier charger to charge the capacitor bank.

3. The pantograph-catenary discharge simulation method according to claim 1, characterized in that, The preset high voltage is 25kV.

4. The pantograph-catenary discharge simulation method according to claim 1, characterized in that, The inverter is a single-phase inverter.

5. The pantograph-catenary discharge simulation method according to claim 1, characterized in that, Controlling the pantograph and contact wire to make and separate at a preset frequency and amplitude includes: The contact wire is driven to move by a pneumatic vibration device so that the pantograph and the contact wire can make and separate at a preset frequency and amplitude.

6. The pantograph-catenary discharge simulation method according to claim 5, characterized in that, The pneumatic vibration device is connected to the contact wire via an insulated pull rod, and the vibration frequency and amplitude of the contact wire are controlled by adjusting the air pressure and air volume of the pneumatic vibration device.

7. The pantograph-catenary discharge simulation method according to claim 1, characterized in that, The circuit breaker controls the opening and closing of the high-voltage circuit supplying power to the contact wire, and the circuit breaker is located between the step-up transformer and the contact wire.

8. The pantograph-catenary discharge simulation method according to claim 1, characterized in that, An equivalent load is connected between the low-voltage end of the step-up transformer and the pantograph; When the pantograph separates from the contact wire and discharges, the discharge current returns to the low-voltage end of the step-up transformer after passing through the equivalent load of the pantograph, forming a discharge current loop.

9. A pantograph-catenary discharge simulation system, characterized in that, Including pantograph and contact wire, and also: Energy storage unit, used to store electrical energy; An inverter is used to convert the electrical energy stored in the energy storage unit into single-phase alternating current. A step-up transformer is used to step up the single-phase AC power after inversion to a preset high voltage and then deliver it to the contact wire. The control unit is used to control the pantograph and the contact wire to make contact and separate at a preset frequency and amplitude, and to generate discharge in the pantograph-catenary gap to simulate the pantograph-catenary disconnection process.

10. The pantograph-catenary discharge simulation system according to claim 9, characterized in that, The energy storage unit includes a power supply, a rectifier charger, and a capacitor bank; The power supply is used to provide three-phase alternating current; A rectifier charger is used to rectify three-phase AC power into DC power to charge capacitor banks.

11. An electronic device, characterized in that, include: Processor and memory; The memory is used to store computer programs, and the processor calls the computer programs stored in the memory to execute the pantograph-catenary discharge simulation method according to any one of claims 1 to 8.

12. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, enables the processor to perform the pantograph-catenary discharge simulation method according to any one of claims 1 to 8.

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