A traction converter, control method, apparatus, device, medium and system

Abstract

The application belongs to the technical field of locomotive traction converters, and particularly relates to a traction converter, a control method, a device, equipment, a medium and a system. The application provides a traction converter, which comprises: a first end of a first switch is electrically connected with a generator; a first end of a second switch is electrically connected with the generator; an input end of a third switch is electrically connected with a starting power supply; an output end of the third switch comprises a first output end and a second output end, the first output end is electrically connected with a first traction circuit, the second output end is electrically connected with a second traction circuit, and the first output end and the second output end are used for cooperating with the first switch and the second switch. In the application, the first switch, the second switch and the third switch are cooperated to enable the traction circuit to realize the starting function, and the hardware starting reliability of the traction converter is improved.

Description

Technical Field

[0001] This invention belongs to the technical field of locomotive traction converters, specifically relating to a traction converter, control method, device, equipment, medium, and system. Background Technology

[0002] There are generally three ways to start a diesel engine in an internal combustion locomotive: electric motor starting, air motor starting, and inverter frequency conversion starting.

[0003] Electric motor starting involves using a control battery to drive a DC starter motor, which in turn rotates the diesel engine via a gearbox or large disc until the engine reaches its ignition speed, thus starting the engine. While simple and easy to implement, this method involves numerous mechanical components and results in a short motor lifespan, making it unsuitable for the integrated main and auxiliary motor development trend in AC drive locomotives.

[0004] Air motor starting involves using compressed air to drive an air motor, which in turn drives the diesel engine to rotate until the engine reaches its ignition speed, thus starting the diesel engine. This method requires compressed air as power, and when the main air cylinder pressure is insufficient, a DC air compressor must be used to supplement the compressed air. This method has poor real-time performance, involves many mechanical components, and results in a large motor and air cylinder, making it unsuitable for the development trend of AC drive locomotives with integrated main and auxiliary power systems.

[0005] Inverter-based frequency conversion starting utilizes the 74V or 110V DC voltage from the control battery to provide excitation during the start-up phase. Simultaneously, the control battery voltage is applied to the intermediate DC link, and the traction inverter module outputs three-phase AC power, which is then applied to the main generator output. At this time, the main generator functions as a motor. The traction inverter module's frequency conversion voltage regulation, in conjunction with the excitation controller, drives the main generator to rotate until the diesel engine reaches its ignition speed. Then, the control of the traction inverter module is disconnected, and the main generator functions as a motor again. This method eliminates complex mechanical structures, reduces size, and aligns with the development trend of integrated main and auxiliary power systems in AC drive locomotives. However, it requires the addition of a starter transfer switch (CTS) and high-power contactors, among other equipment. Furthermore, existing traction converters typically only have one reversible rectifier module; if this module fails, the internal combustion engine cannot be started. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention proposes a traction converter, control method, device, equipment, medium, and system. This application discloses a traction converter comprising: a first switch, a second switch, a third switch, a first traction circuit, and a second traction circuit; a first terminal of the first switch is electrically connected to a generator, and a second terminal of the first switch is electrically connected to a first terminal of the first traction circuit, used to switch the connection state between the first traction circuit and the generator; a second terminal of the first traction circuit is electrically connected to a traction motor; a first terminal of the second switch is electrically connected to the generator, and a second terminal of the second switch is electrically connected to a first terminal of the second traction circuit, used to switch the connection state between the second traction circuit and the generator; a second terminal of the second traction circuit is electrically connected to the traction motor; an input terminal of the third switch is electrically connected to a starting power supply; the output terminal of the third switch includes a first output terminal and a second output terminal, the first output terminal being electrically connected to the first traction circuit, and the second output terminal being electrically connected to the second traction circuit, used in conjunction with the first and second switches to switch the operating state of the traction converter. In this application, the cooperation of the first switch, the second switch and the third switch enables the traction circuit to start up, thereby improving the hardware start-up reliability of the traction converter.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention includes seven aspects.

[0008] In a first aspect, a traction converter is provided, comprising: a first switch, a second switch, a third switch, a first traction circuit, and a second traction circuit; a first terminal of the first switch is electrically connected to a generator, and a second terminal of the first switch is electrically connected to a first terminal of the first traction circuit, for switching the connection state between the first traction circuit and the generator; a second terminal of the first traction circuit is electrically connected to a traction motor; a first terminal of the second switch is electrically connected to the generator, and a second terminal of the second switch is electrically connected to a first terminal of the second traction circuit, for switching the connection state between the second traction circuit and the generator; a second terminal of the second traction circuit is electrically connected to the traction motor; an input terminal of the third switch is electrically connected to a starting power supply; the output terminal of the third switch includes a first output terminal and a second output terminal, the first output terminal being electrically connected to the first traction circuit, and the second output terminal being electrically connected to the second traction circuit, for cooperating with the first switch and the second switch to switch the operating state of the traction converter.

[0009] In some embodiments, the first traction circuit includes: a first rectifier detection module, a first reversible rectifier module, a first intermediate DC unit, a first DC bus, a first inverter detection module, and a first traction inverter module; a first terminal of the first rectifier detection module is electrically connected to a second terminal of the first switch, and a second terminal of the first rectifier detection module is electrically connected to a first terminal of the first reversible rectifier module; a second terminal of the first reversible rectifier module is electrically connected to a first terminal of the first DC bus; a first terminal of the first traction inverter unit is electrically connected to a second terminal of the first DC bus, and a second terminal of the first traction inverter unit is electrically connected to a first terminal of the first inverter detection module; a second terminal of the first inverter detection module is electrically connected to the traction motor; a third switch is electrically connected to the first DC bus through a first output terminal; the first intermediate DC unit is mounted on the first DC bus, or integrated on the second terminal of the first reversible rectifier module, or integrated on the first terminal of the first traction inverter unit.

[0010] In some embodiments, the second traction circuit includes: a second rectifier detection module, a second reversible rectifier module, a second intermediate DC unit, a second DC bus, a second traction inverter module, and a second inverter detection module; the first end of the second rectifier detection module is electrically connected to the second end of the second switch, and the second end of the second rectifier detection module is electrically connected to the first end of the second reversible rectifier module; the second end of the second reversible rectifier module is electrically connected to the first end of the second DC bus; the first end of the second traction inverter unit is electrically connected to the second end of the second DC bus, and the second end of the second traction inverter unit is electrically connected to the first end of the second inverter detection module; the second end of the second inverter detection module is electrically connected to the traction motor; the third switch is electrically connected to the second DC bus through the second output terminal; the second intermediate DC unit is installed on the second DC bus, or integrated on the second end of the second reversible rectifier module, or integrated on the first end of the second traction inverter unit.

[0011] In some embodiments, the third switch includes: a first position, a second position, a third position, and a fourth position; when the third switch is in the first position, and the first switch is closed, and the second switch is open, the starting power supply is connected to the first DC bus through the first output terminal of the third switch, at which time the traction converter can achieve the purpose of supplying power to the generator through the first reversible rectifier module; when the third switch is in the second position, and the first switch is open, and the second switch is closed, the starting power supply is connected to the second DC bus through the second output terminal of the third switch, at which time the traction converter can achieve the purpose of supplying power to the generator through the second reversible rectifier module. The purpose of the reversible rectifier module to supply power to the generator is as follows: When the third switch is in the third position, and the first switch or the second switch is closed, or both the first switch and the second switch are closed, the traction converter is in normal operation. At this time, the third switch is not connected to either the first DC bus or the second DC bus. When the third switch is in the fourth position, and the first switch or the second switch is closed, the traction converter is in combined operation or regenerative braking state. At this time, the first DC bus and the second DC bus are connected to each other through the third switch, and the first DC bus and the second DC bus of the start-up power supply are disconnected.

[0012] In some embodiments, the first traction circuit further includes: a first energy-consuming device; the first energy-consuming device is electrically connected to a first terminal of the first rectification detection module.

[0013] In some embodiments, the second traction circuit further includes: a second energy-consuming device; the second energy-consuming device is electrically connected to the first end of the second rectification detection module.

[0014] In some embodiments, when the third switch is in the fourth position and the first switch or the second switch is closed, the traction converter can also be in a braking energy reuse state.

[0015] Secondly, this application proposes a control method applicable to a traction converter as described in any of the first aspects, comprising: acquiring a control command input from an external source; determining a target operating state of the traction converter according to the control command; and controlling the states of the first switch, the second switch, and the third switch according to the target operating state, so that the traction converter is in the target operating state.

[0016] In some embodiments, the target operating state includes: a startup state; controlling the states of the first switch, the second switch, and the third switch according to the target operating state, so that the traction converter is in the target operating state, includes: when the target operating state is the startup state; acquiring the first current state of the first reversible rectifier module and the second current state of the second reversible rectifier module, as well as a first preset judgment condition; determining whether the first current state and the second current state are normal according to the first preset judgment condition; when both the first current state and the second current state are normal, acquiring the first start count of the first reversible rectifier module and the second start count of the second reversible rectifier module; determining the first target reversible rectifier module according to the first start count and the second start count; determining the first target state of the first switch, the second switch, and the third switch according to the first target rectifier module; controlling the first switch, the second switch, and the third switch according to the first target state, so that the traction converter is in the startup state.

[0017] In some embodiments, the method further includes: determining the first reversible rectifier module or the second reversible rectifier module as a first target reversible rectifier module when only the first current state or the second current state is normal; determining a first target state of the first switch, the second switch, and the third switch based on the first target reversible rectifier module; and controlling the first switch, the second switch, and the third switch based on the first target state so that the traction converter is in the startup state.

[0018] In some embodiments, the target operating state includes a braking energy recovery state; controlling the states of the first switch, the second switch, and the third switch according to the target operating state, so that the traction converter is in the target operating state, further includes: when the target operating state is the braking energy recovery state, acquiring the first recovery count of the first reversible rectifier module and the second recovery count of the second reversible rectifier module; determining a second target reversible rectifier module based on the first recovery count and the second recovery count; determining a second target state of the first switch and the second switch based on the second target reversible rectifier module; controlling the third switch to a fourth position, and controlling the first switch, the second switch, and the third switch according to the second target state, so that the traction converter is in the braking energy recovery state.

[0019] In some embodiments, the target operating state further includes a combined operating state; the step of controlling the states of the first switch, the second switch, and the third switch according to the target operating state, so that the traction converter is in the target operating state, further includes: when the target operating state is the combined operating state, acquiring the sixth current state of the first reversible rectifier module, the third current state of the second reversible rectifier module, the fourth current state of the first traction inverter module, the fifth current state of the second traction inverter module, and a second preset judgment condition; determining whether the sixth current state, the third current state, the fourth current state, and the fifth current state are normal according to the second preset judgment condition, and acquiring the judgment result; determining the third target state of the first switch and the second switch according to the judgment result; controlling the third switch to the fourth position, and controlling the first switch, the second switch, and the third switch according to the third target state, so that the traction converter is in the combined operating state.

[0020] Thirdly, this application proposes a control device, comprising: a first acquisition module for acquiring externally input control commands; a first determination module for determining a target operating state of the traction converter based on the control commands; and a first execution module for controlling the states of the first switch, the second switch, and the third switch according to the target operating state, so that the traction converter is in the target operating state.

[0021] The fourth aspect provides an electronic device including a storage device and a processor, the storage device storing a computer program, the processor executing the computer program to implement the steps of a control method as described in any of the second aspects.

[0022] The fifth aspect provides a storage medium storing a computer program that can be executed by one or more processors, the computer program being able to implement the steps of any of the control methods in the second aspect.

[0023] In a sixth aspect, this application proposes a computer program, including computer program / instructions, which, when executed by a processor, implement the steps of the control method as described in any one of the second aspects.

[0024] In a seventh aspect, this application proposes a traction converter system, comprising a traction converter as described in any of the first aspects and an electronic device as described in the fourth aspect; the electronic device is connected to the traction converter.

[0025] The beneficial effects of this invention are as follows: By using reversible rectifier modules in the two traction circuits, the high-power inverter-side changeover switch and its start-up circuit are eliminated, reducing the number of devices; it also facilitates material simplification and makes structural and heat dissipation design more standardized; and through the cooperation of the first switch, the second switch and the third switch, both rectifier modules can realize the start-up function, improving the hardware start-up reliability of the traction converter. Attached Figure Description

[0026] The scope of this disclosure can be better understood by reading the following detailed description of exemplary embodiments in conjunction with the accompanying drawings. The accompanying drawings are:

[0027] Figure 1 An electrical structure diagram of a traction converter provided in an embodiment of this application;

[0028] Figure 2 An electrical structure diagram of a traction converter in an integrated state with a reversible rectifier module provided in this application embodiment;

[0029] Figure 3 An electrical structure diagram of a traction converter in an integrated state of traction inverter module provided in this application embodiment;

[0030] Figure 4 An electrical structure diagram of a traction converter with energy-consuming equipment is provided for an embodiment of this application;

[0031] Figure 5 This is an overall flowchart of a control method provided in an embodiment of this application;

[0032] Figure 6 This application provides an overall flowchart of a control method applicable to the startup state, as illustrated in an embodiment of the present application.

[0033] Figure 7 An overall flowchart of a control method applicable to braking energy reuse state provided in the embodiments of this application;

[0034] Figure 8 This is a structural block diagram of a control device provided in an embodiment of this application. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. The described embodiments should not be regarded as limitations on this application. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0036] In the following description, references are made to “some embodiments,” which describe a subset of all possible embodiments. However, it is understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0037] If the application documents contain similar descriptions such as "first, second, third", the following explanation shall be added: In the following description, the terms "first, second, third" are used only to distinguish similar objects and do not represent a specific order of objects. It is understood that "first, second, third" may be interchanged in a specific order or sequence where permitted, so that the embodiments of this application described herein can be implemented in an order other than that illustrated or described herein.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0039] Example 1:

[0040] When using inverter frequency conversion to start internal combustion engines, it is necessary to add other equipment such as a starter transfer switch (CTS) and a high-power contactor. Moreover, existing traction converters generally only have one reversible rectifier module. When this reversible rectifier module fails, it is impossible to start the internal combustion engine.

[0041] To address the problems existing in the current technology, such as Figure 1 As shown, this application provides a traction converter. The traction converter includes: a first switch 2, a second switch 3, a third switch 4, a first traction circuit, and a second traction circuit.

[0042] The first terminal of the first switch 2 is electrically connected to the generator 1, and the second terminal of the first switch 2 is electrically connected to the first terminal of the first traction circuit, used to switch the connection state between the first traction circuit and the generator 1. The second terminal of the first traction circuit is electrically connected to the traction motor 6. The first terminal of the second switch 3 is electrically connected to the generator 1, and the second terminal of the second switch 3 is electrically connected to the first terminal of the second traction circuit, used to switch the connection state between the second traction circuit and the generator 1. The second terminal of the second traction circuit is electrically connected to the traction motor 6. The input terminal of the third switch 4 is electrically connected to the starting power supply 5.

[0043] The output terminals of the third switch 4 include a first output terminal and a second output terminal. The first output terminal is electrically connected to the first traction circuit, and the second output terminal is electrically connected to the second traction circuit. It is used in conjunction with the first switch 2 and the second switch 3 to switch the operating state of the traction converter. The third switch 4 has multiple positions, including at least a first position, a second position, a third position, and a fourth position.

[0044] When the third switch 4 is in the first position, and the first switch 2 is closed and the second switch 3 is open, the starting power supply 5 is electrically connected to the first reversible rectifier module 8 through the third switch 4. At this time, the traction converter is in the state of supplying power to the generator 1 through the first reversible rectifier module 8.

[0045] When the third switch 4 is in the second position, and the first switch 2 is open and the second switch 3 is closed, the starting power supply 5 is electrically connected to the second reversible rectifier module 13 through the third switch 4. At this time, the traction converter is in the state of supplying power to the generator 1 through the second reversible rectifier module 13.

[0046] When the third switch 4 is in the third position, and the first switch 2 or the second switch 3 is closed, or both the first switch 2 and the second switch 3 are closed, the traction converter is in normal operation. At this time, the third switch 4 is not connected to either the first reversible rectifier module 8 or the second reversible rectifier module 13.

[0047] When the third switch 4 is in the fourth position and the first switch 2 or the second switch 3 is closed, the traction converter is in a combined operation state or a braking energy recovery state. At this time, the first DC bus and the second DC bus are connected together through the third switch 4, and the first DC bus and the second DC bus of the start-up power supply 5 are disconnected.

[0048] Since the traction inverter in this application has two traction circuits, in actual use, we can select which traction circuit to use as the starting circuit for the internal combustion engine based on the actual situation of each traction circuit.

[0049] In some embodiments, the first traction circuit includes: a first rectifier detection module 7, a first reversible rectifier module 8, a first intermediate DC unit 9, a first DC bus, a first inverter detection module 11, and a first traction inverter module 10.

[0050] The first terminal of the first rectifier detection module 7 is electrically connected to the second terminal of the first switch 2, and the second terminal of the first rectifier detection module 7 is electrically connected to the first terminal of the first reversible rectifier module 8. The second terminal of the first reversible rectifier module 8 is electrically connected to the first terminal of the first DC bus. The first terminal of the first traction inverter unit is electrically connected to the second terminal of the first DC bus, and the second terminal of the first traction inverter unit is electrically connected to the first terminal of the first inverter detection module 11. The second terminal of the first inverter detection module 11 is electrically connected to the traction motor 6.

[0051] The output terminal of the third switch 4 is electrically connected to the first DC bus through the first output terminal.

[0052] The first intermediate DC unit 9 is installed on the first DC bus, or integrated on the second end of the first reversible rectifier module 8, or integrated on the first end of the first traction inverter unit.

[0053] The first rectifier detection module 7 is used to detect the three-phase AC voltage and current data on the input side of the first reversible rectifier module 8. Similarly, the first inverter detection module 11 is used to detect the three-phase AC current and voltage data on the output side of the first traction inverter module 10.

[0054] In some embodiments, the second traction circuit includes: a second rectifier detection module 12, a second reversible rectifier module 13, a second intermediate DC unit 14, a second DC bus, a second traction inverter module 15, and a second inverter detection module 16.

[0055] The first terminal of the second rectifier detection module 12 is electrically connected to the second terminal of the second switch 3, and the second terminal of the second rectifier detection module 12 is electrically connected to the first terminal of the second reversible rectifier module 13. The second terminal of the second reversible rectifier module 13 is electrically connected to the first terminal of the second DC bus. The first terminal of the second traction inverter unit is electrically connected to the second terminal of the second DC bus, and the second terminal of the second traction inverter unit is electrically connected to the first terminal of the second inverter detection module 16. The second terminal of the second inverter detection module 16 is electrically connected to the traction motor 6.

[0056] The second rectifier detection module 12 is used to detect the three-phase AC voltage and current data on the input side of the second reversible rectifier module 13. Similarly, the second inverter detection module 16 is used to detect the three-phase AC current and voltage data on the output side of the second traction inverter module 15.

[0057] The third switch 4 is electrically connected to the second DC bus via the second output terminal.

[0058] The second intermediate DC unit 14 is installed on the second DC bus, or integrated on the second end of the second reversible rectifier module 13, or integrated on the first end of the second traction inverter unit.

[0059] The main functions of the first intermediate DC unit 9 and the second intermediate DC unit 14 can be any one of the following: intermediate DC circuit filtering and energy support (support capacitor), intermediate DC circuit voltage / current detection (voltage / current sensor), intermediate DC circuit voltage indication (voltage indicator), intermediate DC circuit chopping (boost chopping / buck chopping), or a combination of some functions, or a combination of all functions.

[0060] Among them, such as Figure 1 As shown, the first intermediate DC unit 9 can be installed on the first DC bus, located between the first reversible rectifier module 8 and the first traction inverter module 10. Similarly, the second intermediate DC unit 14 is installed on the second DC bus, located between the second reversible rectifier module 13 and the second traction inverter module 15.

[0061] It can also be like Figure 2 Therefore, the first intermediate DC unit 9 is integrated onto the second end of the first reversible rectifier module 8, and the second intermediate DC unit 14 is integrated onto the second end of the second reversible rectifier module 13 to improve the overall integration of the traction rectifier and reduce the overall size and complexity of the traction converter. Alternatively, the first rectification detection module 7 can be integrated onto the first end of the first reversible rectifier module 8, and the second rectification detection module 12 can be integrated onto the second reversible rectifier module 13. This integrates the first rectification detection module 7, the first reversible rectifier module 8, and the first intermediate DC unit 9 into a first reversible rectifier unit. Similarly, the second rectification detection module 12, the second reversible rectifier module 13, and the second intermediate DC power supply are integrated into a second reversible rectifier unit.

[0062] It can also be like Figure 3 As shown, the first intermediate DC unit 9 is integrated on the first end of the first traction inverter unit. The second intermediate DC unit 14 is integrated on the first end of the second traction inverter unit. This improves the overall integration of the traction rectifier and reduces the overall size and complexity of the traction converter. Alternatively, the first inverter detection module 11 can be integrated on the second end of the first traction inverter module 10, and the second inverter detection module 16 can be integrated on the second end of the second traction inverter module 15. This integrates the first intermediate DC unit 9, the first traction inverter module 10, and the first traction detection module into the first traction inverter unit. Similarly, the second intermediate DC unit 14, the second traction inverter module 15, and the second traction detection module into the second traction inverter unit.

[0063] Therefore, the first traction circuit is used as the starting circuit for a specific start-up. At this time, the third switch 4 is in the first position, the first switch 2 is closed, and the second switch 3 is open. When the third switch 4 is in the first position, the starting power supply 5 is connected to the first DC bus. The starting circuit at this time consists of: generator 1, the first reversible rectifier module 8, and the starting power supply 5. Power is supplied by the starting power supply 5, while the first reversible rectifier module 8 is in inverter mode, responsible for converting the DC power output from the starting power supply 5 into three-phase AC power to drive the generator 1 to rotate, which then drives the internal combustion engine to start. When the generator 1 reaches a certain speed, the internal combustion engine can be started. After the internal combustion engine has started, the third switch 4 can be adjusted to the third position, at which point the internal combustion engine can perform external work, entering traction mode.

[0064] In this application, the starting circuit uses reversible rectifier modules in both traction circuits, which eliminates the high-power inverter-side changeover switch and its starting circuit, reducing the number of devices; it also facilitates material simplification and unification of structural and heat dissipation design; and the coordinated use of three switches enables both rectifier modules to achieve the starting function, improving the hardware starting reliability of the traction converter.

[0065] In this application, the switching of multiple operating states of the traction converter can be realized by the cooperation of the first switch 2, the second switch 3 and the third switch 4.

[0066] For example, during startup, the third switch 4 is placed in either the first or second position. This causes the first switch 2 to close and the second switch 3 to open, or vice versa. This puts the first reversible rectifier module 8 or the second inverter rectifier module into inverter mode, completing the startup of the internal combustion engine. During startup, the excitation device 17 of the generator 1 also needs to be controlled synchronously. By controlling the excitation device 17, the excitation current of the generator 1 is controlled, causing the generator 1 to operate as an electric motor, thereby driving the diesel engine to its ignition speed and completing the startup. The use of the generator 1 and the excitation device 17 in conjunction is a conventional technique in this field, so the relationship between the excitation device 17 and the generator 1 will not be described in detail in this application.

[0067] For example, when moving a vehicle at low speed within the warehouse, since it is moving at low speed, there is no need to supply power to the internal combustion engine. At this time, the third switch 4 can be in the first or second position, while the first switch 2 and the second switch 3 are both turned off. The starting power supply 5 is used as the main power output to drive the traction motor 6 through the first traction inverter module or the second traction inverter module 15 to complete the low-speed vehicle movement within the warehouse.

[0068] For example, when the third switch 4 is in the fourth position, the traction converter can also be in a combined operation state. When the first reversible rectifier module 8 or the second reversible rectifier module 13 is faulty, and at the same time the second traction inverter module 15 or the first traction inverter module 10 is faulty, the traction converter in this application can operate in a combined operation state.

[0069] In combined operation, when the first reversible rectifier module 8 and the second traction inverter module 15 malfunction, while the second reversible rectifier module 13 and the first traction inverter module 10 are functioning normally, the third switch 4 can be set to the fourth position. The first switch 2 is in the open state, and the second switch 3 is in the closed state. At this time, the electrical energy generated by the generator 1 is rectified by the second reversible rectifier module 13 and output to the first traction inverter module 10, which then drives the traction motor 6 to rotate.

[0070] Similarly, when the second reversible rectifier module 13 and the first traction inverter module 10 are faulty, and the first reversible rectifier module 8 and the second traction inverter module 15 are functioning normally, the third switch 4 can be set to the fourth position, while the first switch 2 is closed and the second switch 3 is open. At this time, the electrical energy generated by the generator 1 is rectified by the first reversible rectifier module 8 and output to the second traction inverter module 15, which then drives the traction motor 6 to rotate.

[0071] Based on the positional relationship between each module and the DC bus, this application can be mainly divided into four regions, each represented by a corresponding reversible rectifier module or traction inverter module. For example, the module located at the front end of the DC bus is represented by a reversible rectifier module, while the module located at the back end of the DC bus is represented by a traction inverter module. In any of these four regions, a failure in any module will cause the entire region to be in a faulty state. Therefore, in this embodiment, a failure in the first reversible rectifier module 8 or the second reversible rectifier module 13 refers to a failure in either the first reversible rectifier module 8 or any of its front-end components, or a failure in either the second reversible rectifier module 13 or any of its front-end components. Similarly, a failure in the first traction inverter module 10 or the second traction inverter module 15 refers to a failure in either the first traction inverter module 10 or any of its rear-end components, or a failure in either the second traction inverter module 15 or any of its rear-end components.

[0072] Since the intermediate DC unit is installed on the DC bus, it is difficult to divide its specific data into any region. Therefore, for the division of the second intermediate DC unit, when the traction converter is as follows... Figure 3As shown, the first intermediate DC unit is integrated into the first traction inverter module, while the second intermediate DC unit is integrated into the second traction inverter module. Therefore, the failure of the first intermediate DC unit 9 and the second intermediate DC unit 14 can be classified as a failure of the first traction inverter module 10 or the second traction inverter module 15. When the traction converter... Figure 2 As shown, the failures of the first intermediate DC unit 9 and the second intermediate DC unit 14 can be classified as failures of the first reversible rectifier module 8 or the second reversible DC module.

[0073] like Figure 4 As shown, in some embodiments, the first traction circuit further includes a first energy-consuming device 18. The first energy-consuming device 18 is electrically connected to the first terminal of the first rectification detection module 7.

[0074] In some embodiments, the second traction circuit further includes a second energy-consuming device 19. The second energy-consuming device 19 is electrically connected to the first terminal of the second rectification detection module 12.

[0075] In some embodiments, when the third switch 4 is in the fourth position and the first switch 2 or the second switch 3 is closed, the traction converter can also be in a braking energy reuse state. At this time, the first DC bus and the second DC bus are connected together through the third switch 4, and the first reversible rectifier module 8 and the second reversible rectifier module 13 of the start-up power supply 5 are disconnected.

[0076] If the traction converter of this application is to be in a regenerative braking state, then energy-consuming devices need to be added to the traction converter. Therefore, in this application, as... Figure 4 As shown, a first energy-consuming device 18 and a second energy-consuming device 19 are respectively added to the first end of the first reversible rectifier module 8 and the first end of the second reversible rectifier module 13.

[0077] When the traction converter needs to be in regenerative braking mode, the third switch 4 is set to the fourth position, while the first switch 2 is closed and the second switch 3 is open, or the first switch 2 is open and the second switch 3 is closed, to recover the electrical energy generated during braking of the traction motor 6. At this time, the first DC bus and the second DC bus are connected together through the third switch 4, while the starting power supply 5 is disconnected from both the first DC bus and the second DC bus.

[0078] When the first switch 2 is closed and the second switch 3 is open, the first reversible rectifier module 8 is in rectification mode, providing armature excitation for the traction motor 6. Since the traction motor 6 is in braking mode, the electrical energy generated during braking can be rectified into DC power by the first traction inverter module 10 and the second traction inverter module 15, and supplied to the second DC bus. Then, the second reversible rectifier module 13, in inverter mode, inverts the DC power from the second DC bus into AC power, supplying it to the second energy-consuming device 19.

[0079] Similarly, when the first switch 2 is open and the second switch 3 is closed, the second reversible rectifier module 13 is in rectification mode, providing armature excitation for the traction motor 6. Since the traction motor 6 is in braking mode, the electrical energy generated during braking can be rectified into DC power by the first traction inverter module 10 and the second traction inverter module 15, and supplied to the first DC bus. Then, the first reversible rectifier module 8, in inverter mode, inverts the DC power from the first DC bus into AC power, supplying it to the first energy-consuming device 18.

[0080] Furthermore, when the braking energy is reused here, the energy supplied by generator 1 to traction motor 6 is very small, while the recovered energy is very large, so there is no energy waste here. The type and function of the first energy-consuming device 18 and the second energy-consuming device 19 are not limited here. They can be simple electrical energy-consuming devices or energy storage devices such as batteries.

[0081] Therefore, the traction converter proposed in this application not only solves the problem of needing to add a starter switch (CTS) and high-power contactors, as mentioned in the prior art, but also addresses the technical problem that existing traction converters generally only have one reversible rectifier module. When this reversible rectifier module fails, it cannot start the internal combustion engine. This invention eliminates the need for a high-power inverter-side switch and its starting circuit, reducing the number of devices; it also simplifies materials and facilitates standardized structural and heat dissipation design; and through the cooperation of the first switch 2, the second switch 3, and the third switch 4, both rectifier modules can achieve the starting function, thus improving the hardware starting reliability of the traction converter.

[0082] Furthermore, under braking conditions, by coordinating with relevant switches, one of the reversible rectifier modules can be made to operate in three-phase inverter mode. This enables the motor braking energy to be fed back to the intermediate DC circuit and then converted back into three-phase AC energy through three-phase inverter, providing a new way to reuse the braking energy of the diesel locomotive traction motor 6.

[0083] In addition, under special faults of the traction converter, it can be operated in a combined operation state by switching the switch, thus solving the availability problem of the traction converter under extreme faults.

[0084] Example 2:

[0085] Secondly, regarding the problems existing in the prior art, such as Figure 5 As shown, this application provides a control method applied to an electronic device, which may be a server, mobile terminal, computer, cloud platform, or traction converter, etc. The functions implemented by the device data processing provided in this application embodiment can be achieved by the processor of the electronic device calling program code, wherein the program code can be stored in a computer storage medium. The control method includes:

[0086] Step S1: Obtain control commands input from the outside.

[0087] Step S2: Determine the target operating state of the traction converter according to the control command.

[0088] Step S3: Control the states of the first switch 2, the second switch 3, and the third switch 4 according to the target operating state, so that the traction converter is in the target operating state.

[0089] This application proposes a control method applicable to a traction converter as described in Embodiment 1. The traction converter has two traction circuits, referred to as the first traction circuit and the second traction circuit. The DC buses of the two traction circuits are connected via a third switch 4. By changing the state of the third switch 4, in conjunction with the states of the first switch 2 and the second switch 3, the traction converter can operate in multiple states, each performing different functions. Therefore, switching the operating states of the traction converter requires external control commands. Thus, it is necessary to acquire externally input control commands. The target operating state of the traction converter is then determined based on the control commands. The first switch 2, the second switch 3, and the third switch 4 of the traction converter are then controlled according to the target operating state, causing the traction converter to operate in the target state. The states of the traction converter differ for each of the target operating states. The target operating states of the traction converter include: start-up state, regenerative braking state, and combined operation state.

[0090] Therefore, in some embodiments, when the target operating state is the power-on state, step S3 includes:

[0091] Step S311: When the target working state is the startup state, obtain the first current state of the first reversible rectifier module 8, the second current state of the second reversible rectifier module 13, and the first preset judgment condition.

[0092] Step S312: Determine whether the first current state and the second current state are normal according to the first preset judgment condition.

[0093] Step S313: When both the first current state and the second current state are normal, obtain the first start count of the first reversible rectifier module 8 and the second start count of the second reversible rectifier module 13.

[0094] Step S314: Determine the first target reversible rectifier module based on the first startup count and the second startup count.

[0095] Step S315: Determine the first target state of the first switch 2, the second switch 3 and the third switch 4 based on the first target reversible rectifier module.

[0096] Step S316: Control the first switch 2, the second switch 3 and the third switch 4 according to the first target state, so that the traction converter is in the start-up state.

[0097] Because this application contains two traction circuits, each of which can be connected to the starting power supply 5 to start the internal combustion engine, the traction converter is in the starting state. However, before entering the starting state, the state of each traction circuit needs to be determined. When the traction converter is in the starting state, the main components of the first traction main circuit are: the first rectifier detection module 7 and the first reversible rectifier module 8. The main components of the second traction main circuit are: the second rectifier detection module 12 and the second reversible rectifier module 13. For ease of description, the first rectifier detection module 7 and the first reversible rectifier module 8 are collectively referred to as the first reversible rectifier module 8. Similarly, the second rectifier detection module 12 and the second reversible rectifier module 13 are collectively referred to as the second reversible rectifier module 13.

[0098] Therefore, before changing the state, the states of the first reversible rectifier module 8 and the second reversible rectifier module 13 need to be determined. The first current state corresponds to the state of the first reversible rectifier module 8, and the second current state corresponds to the state of the second reversible rectifier module 13. The determination of the first and second current states is based on a first preset judgment condition. This first preset judgment condition is set manually in advance.

[0099] After passing the first preset judgment condition, it is found that both the first current state and the second current state are in a normal state. That is to say, both the first reversible rectifier module 8 and the second reversible rectifier module 13 are normal. In other words, the starting power supply 5 can start the internal combustion engine through either traction circuit. At this time, in order to maximize the hardware reliability of the traction converter in starting the internal combustion engine, it is necessary to ensure that the two traction circuits participate in the starting process an equal number of times.

[0100] Therefore, in this embodiment, it is also necessary to obtain the first start count of the first reversible rectifier module 8 and the second start count of the second reversible rectifier module 13. Finally, based on the first and second start counts, it is determined whether the internal combustion engine is started by the first reversible rectifier module 8 or the second reversible rectifier module 13, i.e., the first target reversible rectifier module. Since the states of the first switch 2, the second switch 3, and the third switch 4 are different when different reversible rectifier modules are used to start the internal combustion engine, after determining the first target reversible rectifier module, the first target states of the first switch 2, the second switch 3, and the third switch 4 can be determined based on the first target reversible rectifier module. Then, the first switch 2, the second switch 3, and the third switch 4 can be controlled according to the first target states, so that the traction converter is in the start-up state.

[0101] However, in real-world scenarios, a reversible rectifier module may malfunction. Therefore, in some embodiments, the method further includes:

[0102] Step S321: When only the first current state or the second current state is normal, determine the first reversible rectifier module 8 or the second reversible rectifier module 13 as the first target reversible rectifier module.

[0103] Step S322: Determine the first target state of the first switch 2, the second switch 3 and the third switch 4 based on the first target reversible rectifier module.

[0104] Step S323: Control the first switch 2, the second switch 3 and the third switch 4 according to the first target state, so that the traction converter is in the start-up state.

[0105] If any reversible rectifier module malfunctions, another working reversible rectifier module is designated as the first target reversible rectifier module. After determining the first target reversible rectifier module, the first target states of the first switch 2, the second switch 3, and the third switch 4 can be determined based on these first target states. Then, the first switch 2, the second switch 3, and the third switch 4 can be controlled according to these first target states to put the traction converter into the start-up state.

[0106] Therefore, in this application, the execution flowchart for the startup state is as follows: Figure 6 As shown.

[0107] Step S401: Determine if the first reversible rectifier is normal. If it is normal, proceed to step S402. If it is not normal, proceed to step S424.

[0108] Step S402: Determine whether the second reversible rectifier module 13 is normal. If it is normal, proceed to step S403. If it is not normal, proceed to step S414.

[0109] Step S403: Determine whether the first number of startups is odd. If the first number of startups is odd, proceed to step S414; otherwise, proceed to step S424.

[0110] Step S414: Control the third switch 4 to the first position, the first switch 2 to be closed, and the second switch 3 to be open;

[0111] Step S415: Determine whether the states of the first switch 2, the second switch 3 and the third switch 4 are all normal. If yes, proceed to step S416; otherwise, proceed to step S424.

[0112] Step S416: Control the first reversible rectifier module 8 to be in inverter mode, and control the excitation device 17 of the generator 1 to be in excitation mode.

[0113] Step S417: Control the excitation device 17 to adjust the speed of generator 1.

[0114] Step S418: Determine if the diesel engine speed is sufficient. If yes, proceed to step S409; otherwise, proceed to step S417.

[0115] Step S409: End the start-up process and control the third switch 4 to the third position.

[0116] Step S424: Control the third switch 4 to the second position, the first switch 2 to be open, and the second switch 3 to be closed.

[0117] Step S425: Determine whether the states of the first switch 2, the second switch 3 and the third switch 4 are all normal. If yes, proceed to step S426; otherwise, proceed to step S414.

[0118] Step S426: Control the second reversible rectifier module 13 to be in inverter mode, and control the excitation device 17 of the generator 1 to be in excitation mode.

[0119] Step S427: Control the excitation device 17 to adjust the speed of generator 1.

[0120] Step S428: Determine if the diesel engine speed is sufficient. If yes, proceed to step S409; otherwise, proceed to step S427.

[0121] The above mainly explains how to control the traction converter when it needs to be in the start-up state.

[0122] When the target operating state is the braking energy reuse state. In some implementations, step S3 further includes:

[0123] Step S331: When the target working state is the braking energy reuse state, obtain the first recycling count of the first reversible rectifier module 8 and the second recycling count of the second reversible rectifier module 13.

[0124] Step S332: Determine the second target reversible rectifier module based on the first recycling count and the second recycling count.

[0125] Step S333: Determine the second target state of the first switch 2 and the second switch 3 according to the second target reversible rectifier module.

[0126] Step S334: Control the third switch 4 to the fourth position, and control the first switch 2, the second switch 3 and the third switch 4 according to the second target state, so that the traction converter is in the braking energy recovery state.

[0127] During regenerative braking, an armature magnetic field needs to be provided to the traction motor 6. The traction motor 6 then generates braking energy, which is then recovered for use by either the first energy-consuming device 18 or the second energy-consuming device 19. This method of reusing braking energy is primarily applicable to applications such as... Figure 4 The aforementioned traction converter requires the addition of energy-consuming devices to dissipate the energy recovered during braking, as the energy recovered during braking needs to be consumed.

[0128] During regenerative braking, to maximize the lifespan of each traction circuit, it's necessary to obtain the first recovery count of the first reversible rectifier module 8 and the second recovery count of the second reversible rectifier module 13 before regenerative braking begins. The second target reversible rectifier module is then determined based on these counts. Since the states of the first switch 2 and the second switch 3 differ when using different reversible rectifier modules for regenerative braking, determining the second target reversible rectifier module allows for the determination of the second target states of the first switch 2 and the second switch 3. Once the second target states are determined, the first switch 2 and the second switch 3 can be controlled accordingly, while simultaneously controlling the third switch 4 to the fourth position.

[0129] When the traction converter needs to be in regenerative braking mode, the third switch 4 is set to the fourth position, while the first switch 2 is closed and the second switch 3 is open, or the first switch 2 is open and the second switch 3 is closed, to recover the electrical energy generated during braking of the traction motor 6. At this time, the first DC bus and the second DC bus are connected together through the third switch 4, while the starting power supply 5 is disconnected from both the first DC bus and the second DC bus.

[0130] When the first switch 2 is closed and the second switch 3 is open, the first reversible rectifier module 8 is in rectification mode, providing armature excitation for the traction motor 6. Since the traction motor 6 is in braking mode, the electrical energy generated during braking can be rectified into DC power by the first traction inverter module 10 and the second traction inverter module 15, and supplied to the second DC bus. Then, the second reversible rectifier module 13, in inverter mode, inverts the DC power from the second DC bus into AC power, supplying it to the second energy-consuming device 19.

[0131] Similarly, when the first switch 2 is open and the second switch 3 is closed, the second reversible rectifier module 13 is in rectification mode, providing armature excitation for the traction motor 6. Since the traction motor 6 is in braking mode, the electrical energy generated during braking can be rectified into DC power by the first traction inverter module 10 and the second traction inverter module 15, and supplied to the first DC bus. Then, the first reversible rectifier module 8, in inverter mode, inverts the DC power from the first DC bus into AC power, supplying it to the first energy-consuming device 18.

[0132] Furthermore, when the braking energy is reused here, the energy supplied by generator 1 to traction motor 6 is very small, while the recovered energy is very large, so there is no energy waste here. The type and function of the first energy-consuming device 18 and the second energy-consuming device 19 are not limited here. They can be simple electrical energy-consuming devices or energy storage devices such as batteries.

[0133] Therefore, in this application, the execution flowchart for the braking energy in the utilization state is as follows: Figure 7 As shown.

[0134] Step S501: Determine if the first number of recyclings is odd. If yes, proceed to step S512; otherwise, proceed to step S522.

[0135] Step S512: Control the third switch 4 to the fourth position, the first switch 2 to open, and the second switch 3 to close.

[0136] Step S513: Determine whether the states of the first switch 2, the second switch 3, and the third switch 4 are all normal. If yes, proceed to step S514; otherwise, proceed to step S510.

[0137] Step S514: Control the first reversible rectifier module 8 to inverter mode.

[0138] Step S515: Determine whether the first reversible rectifier module 8 is normal. If yes, proceed to step S516; otherwise, proceed to step S510.

[0139] Step S516: Start the first energy-consuming device 18.

[0140] Step S517: Determine whether the first energy-consuming device 18 is normal. If it is, proceed to step S518; otherwise, proceed to step S510.

[0141] Step S518: Determine whether the traction motor 6 is in braking state. If yes, proceed to step S513; otherwise, proceed to step S509.

[0142] Step S509: Complete brake energy recovery and exit the brake energy reuse state.

[0143] Step S510: Braking recovery fails, exit braking energy reuse state.

[0144] Step S522: Control the third switch 4 to the fourth position, close the first switch 2, and open the second switch 3.

[0145] Step S523: Determine whether the states of the first switch 2, the second switch 3, and the third switch 4 are all normal. If yes, proceed to step S524; otherwise, proceed to step S510.

[0146] Step S524: Control the second reversible rectifier module 13 to inverter mode.

[0147] Step S525: Determine whether the second reversible rectifier module 13 is normal. If yes, proceed to step S526; otherwise, proceed to step S510.

[0148] Step S526: Start the second energy-consuming device 19.

[0149] Step S527: Determine whether the second energy-consuming device 19 is normal. If yes, proceed to step S528; otherwise, proceed to step S510.

[0150] Step S528: Determine whether the traction motor 6 is in a braking state. If yes, proceed to step S523; otherwise, proceed to step S509.

[0151] The traction converter in this application can also be in a combined operation state. When the target operating state of the traction converter is the combined operation state, in some embodiments, step S3 further includes:

[0152] Step S341: When the target working state is the combined operation state, obtain the sixth current state of the first reversible rectifier module 8, the third current state of the second reversible rectifier module 13, the fourth current state of the first traction inverter module 10, the fifth current state of the second traction inverter module 15, and the second preset judgment condition.

[0153] Step S342: Determine whether the sixth current state, the third current state, the fourth current state, and the fifth current state are normal according to the second preset determination condition, and obtain the determination result.

[0154] Step S343: Determine the third target state of the first switch 2, the second switch 3 and the third switch 4 based on the determination result.

[0155] Step S344: Control the third switch 4 to the fourth position, and control the first switch 2 and the second switch 3 according to the third target state, so that the traction converter is in the combined operation state.

[0156] The combined operation mode in this application can be implemented by switching the switch in the event of a special fault in the traction converter, thus solving the availability problem under extreme faults of the traction converter.

[0157] In this embodiment, the fault in the first reversible rectifier module 8 or the second reversible rectifier module 13 refers to a fault in either the first reversible rectifier module 8 or any of its front-end components, or a fault in either the second reversible rectifier module 13 or any of its front-end components. Similarly, a fault in the first traction inverter module 10 or the second traction inverter module 15 refers to a fault in either the first traction inverter module 10 or any of its back-end components, or a fault in either the second traction inverter module 15 or any of its back-end components.

[0158] Regarding the division of the second intermediate unit, when the traction converter is as follows: Figure 3 as well as Figure 1 As shown, the failures of the first intermediate DC unit 9 and the second intermediate DC unit 14 can be categorized into failures of the first traction inverter module 10 or the second traction inverter module 15. When the traction converter... Figure 3 As shown, the failures of the first intermediate DC unit 9 and the second intermediate DC unit 14 can be classified as failures of the first reversible rectifier module 8 or the second reversible DC module.

[0159] Since the combined operation state of this application involves combining the fault-free devices in the two main circuits and then operating them again, this application needs to obtain the sixth current state of the first reversible rectifier module 8, the third current state of the second reversible rectifier module 13, the fourth current state of the first traction inverter module 10, the fifth current state of the second traction inverter module 15, and the second preset judgment condition. Then, based on the second preset judgment condition, it is determined whether the sixth, third, fourth, and fifth current states are normal, and the judgment result is obtained. Although in this state, it can be determined that the third switch 4 needs to be in the fourth position, the states of the first switch 2 and the second switch 3 are different under different combination methods. Therefore, we need to determine the third target state of the first switch 2 and the second switch 3 based on the judgment result. Finally, the third switch 4 is controlled to be in the fourth position, and the first switch 2 and the second switch 3 are controlled according to the third target state, so that the traction converter is in the combined operation state.

[0160] In combined operation, when the sixth and fifth current states are determined to be abnormal, while the third and fourth current states are normal (i.e., the first reversible rectifier module 8 and the second traction inverter module 15 are faulty, while the second reversible rectifier module 13 and the first traction inverter module 10 are normal), the third switch 4 can be set to the fourth position. The first switch 2 is in the open state, and the second switch 3 is in the closed state. At this time, the electrical energy generated by the generator 1 is rectified by the second reversible rectifier module 13 and output to the first traction inverter module 10, which then drives the traction motor 6 to rotate.

[0161] Similarly, when the sixth and fifth current states are determined to be normal, while the third and fourth current states are abnormal (i.e., the second reversible rectifier module 13 and the first traction inverter module 10 are faulty, and the first reversible rectifier module 8 and the second traction inverter module 15 are normal), the third switch 4 can be set to the fourth position, the first switch 2 can be closed, and the second switch 3 can be opened. At this time, the electrical energy generated by the generator 1 is rectified by the first reversible rectifier module 8 and output to the second traction inverter module 15, which drives the traction motor 6 to rotate.

[0162] In this embodiment, the fault in the first reversible rectifier module 8 or the second reversible rectifier module 13 refers to a fault in either the first reversible rectifier module 8 or any of its front-end components, or a fault in either the second reversible rectifier module 13 or any of its front-end components. Similarly, a fault in the first traction inverter module 10 or the second traction inverter module 15 refers to a fault in either the first traction inverter module 10 or any of its back-end components, or a fault in either the second traction inverter module 15 or any of its back-end components.

[0163] Therefore, in this embodiment, the first current state, second current state, third current state, fourth current state, fifth current state, and sixth current state mentioned can be the current state of other devices in the corresponding region. For example, the first current state can represent the current state of the first reversible rectifier module 8 and its front-end components. Of course, if the first rectifier detection module 7 and the intermediate DC link are integrated into the first reversible rectifier module 8, then the first current state is the current state of the integrated device.

[0164] The control method of this application can control the traction converter to work in different working states, which not only eliminates the high-power inverter side transfer switch and its start-up circuit, reducing the number of equipment; but also facilitates material simplification and unification of structural and heat dissipation design; and through the cooperation of the first switch 2, the second switch 3 and the third switch 4, both rectifier modules can realize the start-up function, which improves the technical effect of hardware start-up reliability of the traction converter.

[0165] Furthermore, under braking conditions, by coordinating with relevant switches, one of the reversible rectifier modules can be made to operate in three-phase inverter mode. This enables the motor braking energy to be fed back to the intermediate DC circuit and then converted back into three-phase AC energy through three-phase inverter, providing a new way to reuse the braking energy of the diesel locomotive traction motor 6.

[0166] In addition, under special faults of the traction converter, it can be operated in a combined operation state by switching the switch, thus solving the availability problem of the traction converter under extreme faults.

[0167] Example 3:

[0168] Based on the foregoing embodiments, this application provides a control device. The modules and units included in the device can be implemented by a processor in a computer device; of course, they can also be implemented by specific logic circuits. In the implementation process, the processor can be a central processing unit (CPU), a microprocessor (MPU), a digital signal processor (DSP), or a field programmable gate array (FPGA), etc.

[0169] like Figure 8 As shown, a control device includes: a first acquisition module 100, a first determination module 200, and a first execution module 300.

[0170] The first acquisition module 100 is used to acquire control commands input from the outside. The first determination module 200 is used to determine the target operating state of the traction converter according to the control commands. The first execution module 300 is used to control the states of the first switch, the second switch, and the third switch according to the target operating state, so that the traction converter is in the target operating state.

[0171] In some embodiments, the first execution module 300 includes: a second acquisition module, a first determination module, a third acquisition module, a second determination module, a third determination module, and a second execution module.

[0172] The second acquisition module is used to acquire the first current state of the first reversible rectifier module and the second current state of the second reversible rectifier module, as well as a first preset judgment condition, when the target operating state is the start-up state. The first judgment module is used to determine whether the first current state and the second current state are normal according to the first preset judgment condition. The third acquisition module is used to acquire the first start count of the first reversible rectifier module and the second start count of the second reversible rectifier module when both the first current state and the second current state are normal. The second determination module is used to determine the first target reversible rectifier module according to the first start count and the second start count. The third determination module is used to determine the first target state of the first switch, the second switch, and the third switch according to the first target rectifier module. The second execution module is used to control the first switch, the second switch, and the third switch according to the first target state, so that the traction converter is in the start-up state.

[0173] In some embodiments, the control device further includes a fourth determining module, a fifth determining module, and a third execution module.

[0174] The fourth determining module is used to determine the first reversible rectifier module or the second reversible rectifier module as the first target reversible rectifier module when only the first current state or the second current state is normal. The fifth determining module is used to determine the first target state of the first switch, the second switch, and the third switch based on the first target reversible rectifier module. The third execution module is used to control the first switch, the second switch, and the third switch according to the first target state, so that the traction converter is in the start-up state.

[0175] In some embodiments, the first execution module 300 further includes a fourth acquisition module, a sixth determination module, a seventh determination module, and a fourth execution module.

[0176] The fourth acquisition module is used to acquire the first recovery count of the first reversible rectifier module and the second recovery count of the second reversible rectifier module when the target operating state is the braking energy recovery state. The sixth determination module is used to determine the second target reversible rectifier module based on the first recovery count and the second recovery count. The seventh determination module is used to determine the second target state of the first switch and the second switch based on the second target reversible rectifier module. The fourth execution module is used to control the third switch to the fourth position and control the first switch and the second switch according to the second target state, so that the traction converter is in the braking energy recovery state.

[0177] In some embodiments, the first execution module 300 further includes a fifth acquisition module, a second judgment module, an eighth determination module, and a fifth execution module.

[0178] The fifth acquisition module is used to acquire the sixth current state of the first reversible rectifier module, the third current state of the second reversible rectifier module, the fourth current state of the first traction inverter module, the fifth current state of the second traction inverter module, and a second preset judgment condition when the target operating state is the combined operating state. The second judgment module is used to determine whether the sixth, third, fourth, and fifth current states are normal according to the second preset judgment condition, and acquire the judgment result. The eighth determination module is used to determine the third target state of the first switch and the second switch according to the judgment result. The fifth execution module is used to control the third switch to the fourth position, and control the first and second switches according to the third target state, so that the traction converter is in the combined operating state.

[0179] The modules in the aforementioned determining device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor within the device in hardware form, or stored in the memory of the processing device in software form, so that the processor can call and execute the operations corresponding to each module. It should be noted that the module division in this embodiment is illustrative and represents only a logical functional division; in actual implementation, other division methods may be used.

[0180] Example 4:

[0181] The fourth aspect provides an electronic device including a storage device and a processor, the storage device storing a computer program, the processor executing the computer program to implement the steps of a control method as described in the second aspect.

[0182] Example 5:

[0183] The fifth aspect provides a storage medium storing a computer program that can be executed by one or more processors, the computer program being able to implement the steps of any of the control methods in the second aspect.

[0184] Example 6:

[0185] In a sixth aspect, this application proposes a computer program, including computer program / instructions, which, when executed by a processor, implement the steps of the control method as described in any one of the second aspects.

[0186] Example 7:

[0187] In a seventh aspect, this application proposes a traction converter system, comprising a traction converter as described in any of the first aspects and an electronic device as described in the fourth aspect; the electronic device is connected to the traction converter.

[0188] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the methods described above. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, or optical storage, etc. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc.

[0189] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of this application. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. It should be understood that in the various embodiments of this application, the sequence numbers of the above-described processes do not imply a sequential order of execution; the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application. The sequence numbers of the above-described embodiments are merely descriptive and do not represent the superiority or inferiority of the embodiments.

[0190] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0191] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods, such as: multiple units or components can be combined, or integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the various components shown or discussed can be through some interfaces, and the indirect coupling or communication connection between devices or units can be electrical, mechanical, or other forms.

[0192] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units. They may be located in one place or distributed across multiple network units. Some or all of the units may be selected to achieve the purpose of this embodiment according to actual needs.

[0193] In addition, each functional unit in the various embodiments of this application can be integrated into one processing unit, or each unit can be a separate unit, or two or more units can be integrated into one unit; the integrated unit can be implemented in hardware or in the form of hardware plus software functional units.

[0194] Those skilled in the art will understand that all or part of the steps of the above method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it performs the steps of the above method embodiments. The aforementioned storage medium includes various media that can store program code, such as mobile storage devices, read-only memory (ROM), magnetic disks, or optical disks.

[0195] Alternatively, if the integrated units described above are implemented as software functional modules and sold or used as independent products, they can also be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of the embodiments of this application, or the parts that contribute to the prior art, 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 controller to execute all or part of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as mobile storage devices, ROMs, magnetic disks, or optical disks.

[0196] The above description is merely an embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A traction converter, characterized in that, include: First switch, second switch, third switch, first traction circuit, and second traction circuit; The first end of the first switch is electrically connected to the generator, and the second end of the first switch is electrically connected to the first end of the first traction circuit, used to switch the connection state between the first traction circuit and the generator. The second end of the first traction circuit is electrically connected to the traction motor; The first end of the second switch is electrically connected to the generator, and the second end of the second switch is electrically connected to the first end of the second traction circuit, for switching the connection state between the second traction circuit and the generator; The second end of the second traction circuit is electrically connected to the traction motor; The input terminal of the third switch is electrically connected to the power supply. The output terminals of the third switch include a first output terminal and a second output terminal. The first output terminal is electrically connected to the first traction circuit, and the second output terminal is electrically connected to the second traction circuit. It is used to cooperate with the first switch and the second switch to switch the operating state of the traction converter. The third switch includes: a first position, a second position, and a fourth position; When the third switch is in the first position, and the first switch is closed and the second switch is open, the traction converter can supply power to the generator through the first traction circuit. When the third switch is in the second position, and the first switch is open and the second switch is closed, the traction converter can supply power to the generator through the second traction circuit.

2. A traction converter according to claim 1, characterized in that, The first traction circuit includes: a first rectifier detection module, a first reversible rectifier module, a first intermediate DC unit, a first DC bus, a first inverter detection module, and a first traction inverter module; The first terminal of the first rectifier detection module is electrically connected to the second terminal of the first switch, and the second terminal of the first rectifier detection module is electrically connected to the first terminal of the first reversible rectifier module; the second terminal of the first reversible rectifier module is electrically connected to the first terminal of the first DC bus; the first terminal of the first traction inverter module is electrically connected to the second terminal of the first DC bus, and the second terminal of the first traction inverter module is electrically connected to the first terminal of the first inverter detection module; the second terminal of the first inverter detection module is electrically connected to the traction motor. The third switch is electrically connected to the first DC bus via the first output terminal; The first intermediate DC unit is installed on the first DC bus, or integrated on the second end of the first reversible rectifier module, or integrated on the first end of the first traction inverter module.

3. A traction converter according to claim 2, characterized in that, The second traction circuit includes: a second rectifier detection module, a second reversible rectifier module, a second intermediate DC unit, a second DC bus, a second traction inverter module, and a second inverter detection module; The first terminal of the second rectifier detection module is electrically connected to the second terminal of the second switch, and the second terminal of the second rectifier detection module is electrically connected to the first terminal of the second reversible rectifier module; the second terminal of the second reversible rectifier module is electrically connected to the first terminal of the second DC bus; the first terminal of the second traction inverter module is electrically connected to the second terminal of the second DC bus, and the second terminal of the second traction inverter module is electrically connected to the first terminal of the second inverter detection module; the second terminal of the second inverter detection module is electrically connected to the traction motor. The third switch is electrically connected to the second DC bus via the second output terminal; The second intermediate DC unit is installed on the second DC bus, or integrated on the second end of the second reversible rectifier module, or integrated on the first end of the second traction inverter module.

4. A traction converter according to claim 3, characterized in that, The third switch also includes: a third gear position and a fourth gear position; When the third switch is in the first position and the first switch is closed and the second switch is open, the starting power supply is connected to the first DC bus through the first output terminal of the third switch. At this time, the traction converter can achieve the purpose of supplying power to the generator through the first reversible rectifier module. When the third switch is in the second position, and the first switch is open and the second switch is closed, the starting power supply is connected to the second DC bus through the second output terminal of the third switch. At this time, the traction converter can achieve the purpose of supplying power to the generator through the second reversible rectifier module. When the third switch is in the third position, and the first switch or the second switch is closed, or both the first switch and the second switch are closed, the traction converter is in normal operation. At this time, the third switch is not connected to either the first DC bus or the second DC bus. When the third switch is in the fourth position and the first switch or the second switch is closed, the traction converter is in a combined operation state or a braking energy recovery state. At this time, the first DC bus and the second DC bus are connected to each other through the third switch, and the start-up power supply is disconnected from the first DC bus and the second DC bus.

5. A traction converter according to claim 4, characterized in that, The first traction circuit also includes: a first energy-consuming device; The first energy-consuming device is electrically connected to the first terminal of the first rectifier detection module.

6. A traction converter according to claim 5, characterized in that, The second traction circuit also includes: a second energy-consuming device; The second energy-consuming device is electrically connected to the first terminal of the second rectifier detection module.

7. A traction converter according to claim 5, characterized in that, When the third switch is in the fourth position, and the first switch or the second switch is closed, the traction converter can still be in the braking energy reuse state.

8. A control method, characterized in that, An appropriate traction converter as described in any one of claims 1-7, comprising: Acquire control commands from external input; The target operating state of the traction converter is determined according to the control command; The states of the first switch, the second switch, and the third switch are controlled according to the target operating state, so that the traction converter is in the target operating state.

9. The control method according to claim 8, characterized in that, The target operating state includes: startup state; controlling the states of the first switch, the second switch, and the third switch according to the target operating state, so that the traction converter is in the target operating state, includes: When the target working state is the startup state, the first current state of the first reversible rectifier module and the second current state of the second reversible rectifier module, as well as the first preset judgment condition, are obtained. Determine whether the first current state and the second current state are normal based on the first preset determination condition; When both the first current state and the second current state are normal, obtain the first start count of the first reversible rectifier module and the second start count of the second reversible rectifier module; The first target reversible rectifier module is determined based on the first number of startups and the second number of startups. The first target state of the first switch, the second switch, and the third switch is determined based on the first target reversible rectifier module; Controlling the first switch, the second switch, and the third switch according to the first target state, so that the traction converter is in the start-up state.

10. A control method according to claim 9, characterized in that, The method further includes: When only the first current state or the second current state is normal, the first reversible rectifier module or the second reversible rectifier module is determined to be the first target reversible rectifier module; The first target state of the first switch, the second switch, and the third switch is determined based on the first target reversible rectifier module; Controlling the first switch, the second switch, and the third switch according to the first target state, so that the traction converter is in the start-up state.

11. The control method according to claim 8, applicable to the traction converter according to claim 7; characterized in that, The target operating state includes: a braking energy reuse state; the step of controlling the states of the first switch, the second switch, and the third switch according to the target operating state, so that the traction converter is in the target operating state, further includes: When the target operating state is the braking energy reuse state, the first recycling count of the first reversible rectifier module and the second recycling count of the second reversible rectifier module are obtained; The second target reversible rectifier module is determined based on the first number of recycling cycles and the second number of recycling cycles; The second target state of the first switch and the second switch is determined according to the second target reversible rectifier module; The third switch is controlled to the fourth position, and the first and second switches are controlled according to the second target state, so that the traction converter is in the braking energy recovery state.

12. The control method according to claim 8, characterized in that, The target operating state also includes: a combined operating state; the step of controlling the states of the first switch, the second switch, and the third switch according to the target operating state, so that the traction converter is in the target operating state, further includes: When the target operating state is a combined operating state, the sixth current state of the first reversible rectifier module, the third current state of the second reversible rectifier module, the fourth current state of the first traction inverter module, the fifth current state of the second traction inverter module, and the second preset judgment condition are obtained. Determine whether the sixth current state, the third current state, the fourth current state, and the fifth current state are normal according to the second preset determination condition, and obtain the determination result; The third target state of the first switch and the second switch is determined based on the determination result; The third switch is controlled to the fourth position, and the first and second switches are controlled according to the third target state, so that the traction converter is in the combined operation state.

13. A control device, characterized in that, The method applicable to any one of claims 8-12 includes: The first acquisition module is used to acquire control commands input from the outside. The first determining module is used to determine the target operating state of the traction converter according to the control command; The first execution module is used to control the states of the first switch, the second switch, and the third switch according to the target operating state, so that the traction converter is in the target operating state.

14. An electronic device, characterized in that, include: A memory and a processor, wherein the memory stores a computer program that, when executed by the processor, performs a control method as described in any one of claims 8 to 12.

15. A storage medium, characterized in that, The computer program stored in the storage medium can be executed by one or more processors, and the computer program can be used to implement the steps of the control method as described in any one of claims 8 to 12.

16. A computer program, characterized in that, Includes a computer program / instructions that, when executed by a processor, implement the steps of the control method as described in any one of claims 8 to 12.

17. A traction converter system, characterized in that, It includes a traction converter as described in any one of claims 1-5 and an electronic device as described in claim 14; the electronic device is connected to the traction converter.

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