A control method, system, device and storage medium for fast charging of train

Abstract

The present application discloses a control method for rapid charging of a train, comprising: after detecting that a charging start condition is met, charging the on-board battery with a constant current according to a determined target current value, and the determined target current value is a target current value that causes the on-board battery voltage to rise at a set rate; when the voltage of the on-board battery rises to a first switching voltage value, charging the on-board battery with a constant power; when the voltage of the on-board battery rises to a second switching voltage value, charging the on-board battery with a constant voltage; after detecting that a charging stop condition is met, stopping charging; wherein the first switching voltage value is lower than the second switching voltage value. By applying the scheme of the present application, rapid charging of trains can be performed, while ensuring the reliability of charging, ensuring the service life of the on-board battery, and reducing energy loss. The present application also provides a control system, equipment, and storage medium for rapid charging of trains, which have corresponding technical effects.

Description

Technical Field

[0001] The present invention relates to the field of rail transit technology, and in particular to a control method, system, device and storage medium for rapid charging of a train. Background Art

[0002] At present, electric-powered rail trains are increasingly widely used. They are a pollution-free and environmentally friendly means of transportation with low construction and operating costs of operating lines, so they have broad room for development.

[0003] The train is equipped with an on-board battery. At the parking base or platform, the high-voltage AC power of the city power grid can be used as the power input, which is stepped down by a transformer and rectified into DC power. Finally, the train's on-board battery is charged through chopping. One current charging scheme is to always charge at the rated current. Although this method takes a short charging time, it is not conducive to improving the service life of the on-board battery and there is a large energy loss, especially when the battery is almost fully charged. There are also charging schemes that charge at a low current, which takes a long time to charge.

[0004] In addition, in actual applications, there are many types of on-board batteries, such as batteries, supercapacitors, and mixed batteries and supercapacitors. Even for the same type of on-board batteries, the specific situations are different, that is, some are new on-board batteries, some are old on-board batteries, and some are partially damaged modules in the on-board batteries. These situations will result in different charging times for on-board batteries of different trains even if they are charged according to a uniformly set rated current. In other words, charging according to a uniformly set rated current often results in the charging rate being too fast or too slow for different on-board batteries. A rate that is too fast is not conducive to ensuring reliability, and a rate that is too slow results in a long time.

[0005] In summary, how to quickly charge the train while ensuring the reliability of charging, ensuring the service life of the on-board battery, and reducing energy loss is a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0006] The purpose of the present invention is to provide a control method, system, device and storage medium for rapid charging of trains, so as to ensure the reliability of charging, ensure the service life of on-board batteries and reduce energy loss while performing rapid charging of trains.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0008] A control method for rapid charging of a train, comprising:

[0009] After detecting that the charging start condition is met, the vehicle battery is charged with a constant current according to the determined target current value, and the determined target current value is a target current value that causes the vehicle battery voltage to rise at a set rate;

[0010] When the voltage of the vehicle battery rises to a first switching voltage value, the vehicle battery is charged at a constant power;

[0011] When the voltage of the vehicle battery rises to the second switching voltage value, the vehicle battery is charged at a constant voltage;

[0012] After detecting that the charging stop condition is met, charging is stopped; wherein the first switching voltage value is lower than the second switching voltage value.

[0013] Preferably, the constant current charging of the vehicle battery according to the determined target current value includes:

[0014] The vehicle battery is charged with a constant current according to a set default current value, and the default current value is adjusted to a target current value based on feedback control, so that when the vehicle battery is charged with a constant current according to the target current value, the vehicle battery voltage rises at a set rate.

[0015] Preferably, the constant current charging of the vehicle battery according to the determined target current value includes:

[0016] The vehicle battery is charged with a constant current according to the set default current value, and the rising rate of the current vehicle battery voltage is detected;

[0017] According to the set corresponding relationship table, a target current value corresponding to the detected rising rate is determined, and the vehicle battery is charged with a constant current according to the determined target current value.

[0018] Preferably, the detecting that the charging start condition is met includes:

[0019] When it is detected that the bow-rail voltage is greater than a preset first voltage threshold and less than a preset second voltage threshold, it is determined that the charging start condition is met.

[0020] Preferably, the detecting that the charging stop condition is met includes:

[0021] When it is detected that the bow-rail voltage is greater than or equal to the second voltage threshold, it is determined that the charging stop condition is met.

[0022] Preferably, it also includes:

[0023] When it is detected that the voltage of the DC link in the charging device rises due to AC grid voltage fluctuation, the rectifier circuit is controlled by a preset regulation mechanism to reduce the voltage of the DC link to offset the influence of the AC grid voltage fluctuation.

[0024] Preferably, it also includes:

[0025] When it is detected that the voltage of the DC link in the charging device rises due to load fluctuation, the chopper circuit is controlled through a preset adjustment mechanism to reduce the voltage of the DC link to offset the influence of the load fluctuation.

[0026] A control system for rapid charging of a train, comprising:

[0027] A constant current charging unit, used to charge the vehicle battery with a constant current according to a determined target current value after detecting that a charging start condition is met, and the determined target current value is a target current value that causes the vehicle battery voltage to rise at a set rate;

[0028] A constant power charging unit, used to charge the vehicle battery at a constant power when the voltage of the vehicle battery rises to a first switching voltage value;

[0029] A constant voltage charging unit, used to charge the vehicle battery at a constant voltage when the voltage of the vehicle battery rises to a second switching voltage value;

[0030] A charging stop unit is used to stop charging after detecting that a charging stop condition is met; wherein the first switching voltage value is lower than the second switching voltage value.

[0031] Preferably, the constant current charging unit is specifically used for:

[0032] After detecting that the charging start condition is met, the vehicle battery is charged with a constant current according to the set default current value, and the default current value is adjusted to the target current value based on feedback control, so that when the vehicle battery is charged with a constant current according to the target current value, the vehicle battery voltage rises at a set rate.

[0033] Preferably, the constant current charging unit is specifically used for:

[0034] After detecting that the charging start condition is met, the vehicle battery is charged with a constant current according to the set default current value, and the current vehicle battery voltage rise rate is detected;

[0035] According to the set correspondence table, a target current value corresponding to the detected rising rate is determined, and the vehicle battery is charged with a constant current according to the determined target current value, so that the vehicle battery voltage rises at the set rate.

[0036] Preferably, the constant current charging unit is specifically used for:

[0037] When it is detected that the bow rail voltage is greater than a preset first voltage threshold and less than a preset second voltage threshold, it is determined that the charging start condition is met;

[0038] The vehicle battery is charged with a constant current according to the determined target current value, and the determined target current value is a target current value that causes the vehicle battery voltage to rise at a set rate.

[0039] Preferably, the charging stop unit is specifically used for:

[0040] When it is detected that the bow-rail voltage is greater than or equal to the second voltage threshold, it is determined that the charging stop condition is met and charging is stopped.

[0041] Preferably, it further comprises: a voltage fluctuation adjustment unit, which is used to:

[0042] When it is detected that the voltage of the DC link in the charging device rises due to the AC grid voltage fluctuation, the rectifier circuit is controlled by a preset adjustment mechanism to reduce the voltage of the DC link to offset the influence of the AC grid voltage fluctuation;

[0043] When it is detected that the voltage of the DC link in the charging device rises due to load fluctuation, the chopper circuit is controlled through a preset adjustment mechanism to reduce the voltage of the DC link to offset the influence of the load fluctuation.

[0044] A control device for rapid charging of a train, comprising:

[0045] Memory for storing computer programs;

[0046] A processor is used to execute the computer program to implement the steps of the control method for rapid charging of a train as described in any one of the above.

[0047] A computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of any of the above-mentioned control methods for rapid charging of a train.

[0048] Applying the technical solution provided by the embodiment of the present invention, constant current charging is first performed to ensure that the charging time of the present application is not too long, that is, it is conducive to achieving fast charging. When the voltage of the vehicle battery rises to the first switching voltage value, the constant current charging module is switched to the constant power charging mode, that is, the vehicle battery is charged with constant power at this time. This is considering that when the voltage of the vehicle battery rises to the first switching voltage value, if it is still charged with constant current, the charging time will be higher than that of constant power charging. Therefore, the present application switches to constant power charging, which is conducive to further reducing the time consumption. Finally, the present application switches to the constant voltage charging mode, that is, when the voltage of the vehicle battery rises to the second switching voltage value, the vehicle battery is charged with constant voltage, which is conducive to ensuring the service life of the vehicle battery and reducing energy loss. In addition, when charging at a constant current, the present application does not pre-set a fixed value, but determines a target current value, which is a target current value that makes the on-board battery voltage rise at a set rate. In other words, the present application takes into account the different types of batteries and the different states of the same type of batteries. If constant current charging is performed according to a uniformly set rated current, it is easy for the charging rate to be too fast or too slow. A charging rate that is too fast is not conducive to ensuring reliability, and a charging rate that is too slow will take too long. In the present application, a suitable target current value is determined, so that in the constant current charging mode, the on-board battery voltage can rise at a set rate, so that the scheme of the present application can ensure the reliability of charging while performing fast charging of the train. In summary, the scheme of the present application can perform fast charging of the train, while ensuring the reliability of charging, ensuring the service life of the on-board battery, and reducing energy loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0050] Figure 1 This is a flow chart of an implementation of a control method for rapid charging of a train in the present invention;

[0051] Figure 2 It is a structural schematic diagram of a charging device in a specific embodiment of the present invention;

[0052] Figure 3 This is a structural schematic diagram of a control system for rapid charging of a train in the present invention;

[0053] Figure 4 This is a schematic diagram of the structure of a control device for rapid charging of a train in the present invention. DETAILED DESCRIPTION

[0054] The core of the present invention is to provide a control method for rapid charging of trains, which can realize rapid charging of trains while ensuring the reliability of charging, ensuring the service life of on-board batteries, and reducing energy loss.

[0055] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0056] Please refer to Figure 1 , Figure 1 This is an implementation flow chart of a method for controlling rapid charging of a train in the present invention. The method for controlling rapid charging of a train may include the following steps:

[0057] Step S101: after detecting that the charging start condition is met, the vehicle battery is charged with a constant current according to a determined target current value, and the determined target current value is a target current value that causes the vehicle battery voltage to rise at a set rate.

[0058] The specific rules of the charging start conditions can be set according to actual needs. For example, in a specific embodiment of the present invention, when it is detected that the bow rail voltage is greater than a preset first voltage threshold and less than a preset second voltage threshold, it can be determined that the charging start conditions are met.

[0059] It is understandable that when no train enters, the voltage value of the bow rail voltage is 0. Of course, in order to avoid voltage jumps caused by interference and other factors, the preset first voltage threshold is usually set to a value greater than 0, which can be selected according to actual needs. The specific value of the second voltage threshold can also be set according to actual needs. When the detected bow rail voltage is greater than the preset first voltage threshold, it means that a train is entering at this time, and the detected bow rail voltage is less than the preset second voltage threshold, which means that the train is not fully charged. Therefore, it can be determined that charging is required, that is, the charging start condition is met.

[0060] When charging in the solution of the present application, three charging modes are sequentially passed: constant current charging mode, constant power charging mode and constant voltage charging mode.

[0061] Specifically, in the constant current charging mode, a constant current output needs to be ensured. The conduction angle of the switch tube in the rectifier circuit can be controlled to move forward to provide sufficient rectification power. At the same time, the chopper circuit is controlled to achieve a constant current output.

[0062] Moreover, in the scheme of the present application, when constant current charging is performed, a current value is not pre-set uniformly, but the corresponding target current value is determined according to the actual situation. When the on-board battery is charged with constant current according to the target current value, it is necessary to ensure that the on-board battery voltage rises at the set rate. This is to take into account that the types of on-board batteries of different trains may be different, and even if the types are the same, the states of the on-board batteries of different trains are different. For example, the on-board battery of train 1 is a capacitor battery and is newer, while the on-board battery of train 2 is a capacitor battery, but older. If both train 1 and train 2 are charged according to the rated current A, the charging rate of the new battery may be lower, that is, the rate of voltage rise is lower, which is not conducive to fast charging. The charging rate of the old battery may be higher, that is, the rate of voltage rise is higher, which is not conducive to ensuring safety.

[0063] The set rate is the ideal and most appropriate voltage rise rate. For a specific train entering the station, the present application selects a suitable target current value so that the on-board battery voltage can rise at the set rate.

[0064] There may be multiple specific ways to determine the target current value. For example, in a specific embodiment of the present invention, the constant current charging of the vehicle battery according to the determined target current value described in step S101 may specifically include:

[0065] The vehicle battery is charged with a constant current according to a set default current value, and the default current value is adjusted to a target current value based on feedback control, so that when the vehicle battery is charged with a constant current according to the target current value, the vehicle battery voltage rises at a set rate.

[0066] In this implementation, the vehicle battery is first charged with a constant current according to the set default current value. Of course, the specific value of the default current value can be preset according to actual needs. Afterwards, the rising rate of the vehicle battery voltage can be detected in real time or in a smaller period, so that the charging current value can be adjusted based on feedback control. When the charging current value is adjusted to a certain value, the rising rate of the vehicle battery voltage at this time reaches the set rate, which means that the value of the charging current at this time is the required target current value. The advantage of such an implementation is that it is more accurate, that is, a more accurate target current value can be obtained, so that the actual rising rate of the vehicle battery voltage more accurately meets the set rate.

[0067] In another specific implementation of the present invention, the constant current charging of the vehicle battery according to the determined target current value described in step S101 may include:

[0068] The vehicle battery is charged with a constant current according to the set default current value, and the rising rate of the current vehicle battery voltage is detected;

[0069] According to the set corresponding relationship table, a target current value corresponding to the detected rising rate is determined, and the vehicle battery is charged with a constant current according to the determined target current value.

[0070] In this implementation, when charging starts, the vehicle battery is first charged with a constant current according to the set default current value. However, there is no need to gradually adjust the charging current value through feedback. Instead, after detecting the current rising rate of the vehicle battery voltage, the target current value corresponding to the detected rising rate is directly determined according to the set correspondence table, thereby charging the vehicle battery with a constant current according to the determined target current value.

[0071] It is understandable that the set correspondence table can be determined and adjusted in advance by theoretical analysis combined with experimental verification. It is understandable that when the vehicle battery is charged with a constant current according to the set default current value, if the detected vehicle battery voltage rise rate is low, it means that the default current value is lower than the ideal charging current value, then according to the set correspondence table, a higher target current value will be selected, which is usually the case with new batteries. Conversely, if the detected vehicle battery voltage rise rate is high, it means that the default current value is higher than the ideal charging current value, then according to the set correspondence table, a lower target current value will be selected, which is usually the case with old batteries.

[0072] This implementation method determines the target current value according to the set correspondence table. Although the accuracy is lower than that of the aforementioned implementation method, that is, the number of target current values ​​set in the correspondence table is naturally limited, the accuracy error is within an acceptable range. In addition, this implementation method is relatively simple and can directly and quickly determine the required target current value, thereby charging the vehicle battery with a constant current according to the determined target current value, and the requirements for the processing performance of the controller are also relatively low.

[0073] Step S102: When the voltage of the vehicle battery rises to a first switching voltage value, the vehicle battery is charged at a constant power.

[0074] When the voltage of the vehicle battery rises to the first switching voltage value, it is necessary to switch from the constant current charging mode to the constant power charging mode.

[0075] Specifically, the conduction angle and trigger angle of the switch tube in the rectifier circuit can be controlled according to the target current value, and the chopper circuit can be adjusted accordingly to ensure constant power output.

[0076] For example, in a specific scenario, the voltage of the vehicle battery is 600V when charging starts. When it is charged to 800V in the constant current charging mode, it is switched to the constant power charging mode. Then, when it is charged to 850V in the constant power charging mode, it is switched to the constant voltage charging mode. When it is charged to 880V in the constant voltage charging mode, the charging is completed. Of course, the values ​​of the first switching voltage value and the second switching voltage value in the specific scenario can be set and adjusted as needed, and of course the first switching voltage value needs to be lower than the second switching voltage value.

[0077] In addition, it should be noted that under normal circumstances, when charging starts, the on-board battery voltage of the train is lower than the first switching voltage value, but there may be special cases where the on-board battery is full. For example, in a small number of occasions, when charging starts, the on-board battery voltage is higher than the first switching voltage value and lower than the second switching voltage value. For such a situation, it is possible to directly enter the constant power charging mode instead of the constant current charging mode, or to enter the constant current charging mode first, and then switch to the constant power charging mode, which does not affect the implementation of the present invention. For another example, there is a situation where the on-board battery voltage is higher than the second switching voltage value but does not meet the charging stop condition. For such a situation, it is possible to directly enter the constant voltage charging mode instead of the constant current charging mode and the constant power charging mode, or to enter the constant current charging mode first, and then switch to the constant power charging mode, and then switch to the constant voltage charging mode, which does not affect the implementation of the present invention.

[0078] The present application switches from the constant current charging mode to the constant power charging mode because when the voltage of the vehicle battery rises to the first switching voltage value, if constant current charging is still used, the charging time will be higher than constant power charging. Therefore, the present application switches to constant power charging, which is conducive to further reducing the time consumption and achieving fast charging.

[0079] Step S103: When the voltage of the vehicle battery rises to the second switching voltage value, the vehicle battery is charged at a constant voltage.

[0080] When the voltage of the vehicle battery rises to the second switching voltage value, it means that the charging is almost completed, that is, the voltage of the vehicle battery is close to the rated voltage. Therefore, the present application charges the vehicle battery at a constant voltage to reduce losses.

[0081] Specifically, the conduction angle of the switch tube in the rectifier circuit can be controlled to move backward, and the chopper circuit can be adaptively adjusted to ensure a constant voltage output. In the constant voltage charging mode, the rated voltage is usually guaranteed to be output.

[0082] Step S104: After detecting that the charging stop condition is met, charging is stopped.

[0083] The specific rules of the charging stop condition can be set according to actual needs. For example, in a specific embodiment of the present invention, when it is detected that the bow rail voltage is greater than or equal to the second voltage threshold, it can be determined that the charging stop condition is met.

[0084] The specific value of the second voltage threshold can be set according to actual needs, for example, it is usually set to the rated voltage value. It is understandable that if the bow rail voltage is detected to be greater than or equal to the second voltage threshold, it can be determined that it is fully charged, so it can be determined that the charging stop condition is met and charging is stopped.

[0085] In a specific embodiment of the present invention, it may also include:

[0086] When it is detected that the voltage of the DC link in the charging device rises due to AC grid voltage fluctuation, the rectifier circuit is controlled through a preset adjustment mechanism to reduce the voltage of the DC link to offset the influence of the AC grid voltage fluctuation.

[0087] For easier understanding, please refer to Figure 2 , is a schematic diagram of the structure of a charging device applicable to a specific embodiment of the present invention, Figure 2 The controller is not shown in the figure. It should be noted that the control method for fast charging of trains in the present application can also be applied to Figure 2 Other specific types of charging devices other than , for example, can be applied to rectifier circuits without redundancy, it can be said that single-phase circuits rather than Figure 2 Three-phase circuit.

[0088] Figure 2 The transformer has a set of three-phase windings on the primary side and two sets of three-phase windings on the secondary side. The transformer is used to step down the city's high-voltage AC voltage into AC that can be rectified to the rated DC voltage. The secondary side of the transformer is connected to the AC input side of the rectifier circuit. Figure 2 There are two parallel rectifier circuits, which can achieve redundancy and suppress pulse wave. The switching device can usually be selected as IGBT, that is, Figure 2 The rectifier circuit can usually be composed of an IGBT three-phase full bridge. The input side of the rectifier circuit is connected to the three-phase AC voltage output of the secondary side of the transformer. The required output voltage can be obtained by controlling the rectifier circuit, that is, the controller can control the voltage of the DC link. Figure 2 A capacitor is also set in the DC link to stabilize the voltage. Figure 2 The reactor is also helpful to suppress harmonics.

[0089] The chopper circuit can also be composed of IGBTs, and multiple branches can be connected in parallel for output. The output voltage can be adjusted by controlling the on and off of the IGBT devices in the chopper circuit. For example, it is commonly adjustable within the range of 500-900V. The input side of the chopper circuit is the output side of the rectifier circuit. The output side of the chopper circuit can be connected to the train through devices such as switch cabinets to charge the on-board battery.

[0090] In this embodiment of the present application, when it is detected that the voltage of the DC link in the charging device rises due to the fluctuation of the AC network voltage, the rectifier circuit will be controlled by a preset adjustment mechanism. Specifically, for example, a detection circuit can be set on the output side of the chopper circuit to collect the output voltage and output current of the chopper circuit, and provide the detection result to the controller. At the same time, detection circuits can be set on the input side and output side of the two rectifier circuits to collect the input voltage and output voltage of the rectifier circuit and provide them to the controller. The controller can determine whether the voltage rise of the DC link is caused by the fluctuation of the AC network voltage based on these signals. If it is determined that it is caused by the fluctuation of the AC network voltage, the rectifier circuit can be adaptively controlled through the preset adjustment mechanism to reduce the voltage of the DC link, that is, the influence of the fluctuation of the AC network voltage can be offset to ensure the stability of the system.

[0091] Furthermore, in a specific embodiment of the present invention, it may also include:

[0092] When it is detected that the voltage of the DC link in the charging device rises due to load fluctuation, the chopper circuit is controlled through a preset adjustment mechanism to reduce the voltage of the DC link to offset the influence of the load fluctuation.

[0093] In this embodiment, when it is detected that the voltage rise of the DC link in the charging device is caused by load fluctuation, the chopper circuit is controlled through a preset adjustment mechanism to reduce the voltage of the DC link to offset the influence of the load fluctuation. Common load fluctuations are fluctuations of inductive loads at the DC end.

[0094] This implementation further ensures the stability of the system. The specific rules of the preset adjustment mechanism can be set and selected according to actual needs, as long as the purpose of this application can be achieved. Usually, a closed-loop feedback control method is adopted, which is more convenient to implement and has better effects.

[0095] Applying the technical solution provided by the embodiment of the present invention, constant current charging is first performed to ensure that the charging time of the present application is not too long, that is, it is conducive to achieving fast charging. When the voltage of the vehicle battery rises to the first switching voltage value, the constant current charging module is switched to the constant power charging mode, that is, the vehicle battery is charged with constant power at this time. This is considering that when the voltage of the vehicle battery rises to the first switching voltage value, if it is still charged with constant current, the charging time will be higher than that of constant power charging. Therefore, the present application switches to constant power charging, which is conducive to further reducing the time consumption. Finally, the present application switches to the constant voltage charging mode, that is, when the voltage of the vehicle battery rises to the second switching voltage value, the vehicle battery is charged with constant voltage, which is conducive to ensuring the service life of the vehicle battery and reducing energy loss. In addition, when charging at a constant current, the present application does not pre-set a fixed value, but determines a target current value, which is a target current value that makes the on-board battery voltage rise at a set rate. In other words, the present application takes into account the different types of batteries and the different states of the same type of batteries. If constant current charging is performed according to a uniformly set rated current, it is easy for the charging rate to be too fast or too slow. A charging rate that is too fast is not conducive to ensuring reliability, and a charging rate that is too slow will take too long. In the present application, a suitable target current value is determined, so that in the constant current charging mode, the on-board battery voltage can rise at a set rate, so that the scheme of the present application can ensure the reliability of charging while performing fast charging of the train. In summary, the scheme of the present application can perform fast charging of the train, while ensuring the reliability of charging, ensuring the service life of the on-board battery, and reducing energy loss.

[0096] Corresponding to the above method embodiment, an embodiment of the present invention further provides a control system for rapid charging of a train, which can be referred to in correspondence with the above.

[0097] See also Figure 3 FIG. 1 is a schematic diagram of a control system for rapid charging of a train according to the present invention, comprising:

[0098] The constant current charging unit 301 is used to charge the vehicle battery with a constant current according to a determined target current value after detecting that the charging start condition is met, and the determined target current value is a target current value that causes the vehicle battery voltage to rise at a set rate;

[0099] The constant power charging unit 302 is used to charge the vehicle battery at a constant power when the voltage of the vehicle battery rises to a first switching voltage value;

[0100] The constant voltage charging unit 303 is used to charge the vehicle battery at a constant voltage when the voltage of the vehicle battery rises to a second switching voltage value;

[0101] The charging stop unit 304 is used to stop charging after detecting that the charging stop condition is met; wherein the first switching voltage value is lower than the second switching voltage value.

[0102] In a specific embodiment of the present invention, the constant current charging unit 301 is specifically used for:

[0103] After detecting that the charging start conditions are met, the vehicle battery is charged with a constant current according to the set default current value, and the default current value is adjusted to the target current value based on feedback control, so that when the vehicle battery is charged with a constant current according to the target current value, the vehicle battery voltage rises at a set rate.

[0104] In a specific embodiment of the present invention, the constant current charging unit 301 is specifically used for:

[0105] After detecting that the charging start condition is met, the vehicle battery is charged with a constant current according to the set default current value, and the current vehicle battery voltage rise rate is detected;

[0106] According to the set correspondence table, a target current value corresponding to the detected rising rate is determined, and the vehicle battery is charged with a constant current according to the determined target current value, so that the vehicle battery voltage rises at the set rate.

[0107] In a specific embodiment of the present invention, the constant current charging unit 301 is specifically used for:

[0108] When it is detected that the bow rail voltage is greater than a preset first voltage threshold and less than a preset second voltage threshold, it is determined that the charging start condition is met;

[0109] The vehicle battery is charged with a constant current according to the determined target current value, and the determined target current value is a target current value that causes the vehicle battery voltage to rise at a set rate.

[0110] In a specific implementation of the present invention, the charging stop unit 304 is specifically used to:

[0111] When it is detected that the bow-rail voltage is greater than or equal to the second voltage threshold, it is determined that the charging stop condition is met and charging is stopped.

[0112] In a specific embodiment of the present invention, it also includes: a voltage fluctuation adjustment unit, which is used to:

[0113] When it is detected that the voltage of the DC link in the charging device rises due to the AC grid voltage fluctuation, the rectifier circuit is controlled through a preset adjustment mechanism to reduce the voltage of the DC link to offset the influence of the AC grid voltage fluctuation;

[0114] When it is detected that the voltage of the DC link in the charging device rises due to load fluctuation, the chopper circuit is controlled through a preset adjustment mechanism to reduce the voltage of the DC link to offset the influence of the load fluctuation.

[0115] Corresponding to the above method and system embodiments, the embodiments of the present invention also provide a control device for fast charging of a train and a computer-readable storage medium, which can be referred to in correspondence with the above. A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the control method for fast charging of a train in any of the above embodiments are implemented. The computer-readable storage medium mentioned here includes random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, register, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the technical field.

[0116] See also Figure 4 FIG. 1 is a schematic diagram of a structure of a control device for rapid charging of a train in the present invention, comprising:

[0117] Memory 401, used for storing computer programs;

[0118] The processor 402 is used to execute a computer program to implement the steps of the method for controlling rapid charging of a train in any of the above embodiments.

[0119] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0120] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0121] Professionals may further realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to the function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention, and the description of the above embodiments is only used to help understand the technical solution and its core idea of ​​the present invention. It should be pointed out that for ordinary technicians in the technical field, without departing from the principle of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A control method for rapid charging of a train, characterized in that: include: After detecting that the charging start condition is met, the vehicle battery is charged with a constant current according to the determined target current value, and the determined target current value is a target current value that causes the vehicle battery voltage to rise at a set rate; When the voltage of the vehicle battery rises to a first switching voltage value, the vehicle battery is charged at a constant power; When the voltage of the vehicle battery rises to the second switching voltage value, the vehicle battery is charged at a constant voltage; After detecting that the charging stop condition is met, charging is stopped; wherein the first switching voltage value is lower than the second switching voltage value; The method of charging the vehicle battery with a constant current according to the determined target current value includes: Performing constant current charging on the vehicle battery according to a set default current value, and adjusting the default current value to a target current value based on feedback control, so that when the vehicle battery is charged with constant current according to the target current value, the voltage of the vehicle battery rises at a set rate; Also includes: When it is detected that the voltage of the DC link in the charging device rises due to the AC grid voltage fluctuation, the rectifier circuit is controlled by a preset adjustment mechanism to reduce the voltage of the DC link to offset the influence of the AC grid voltage fluctuation; Also includes: When it is detected that the voltage of the DC link in the charging device rises due to load fluctuation, the chopper circuit is controlled through a preset adjustment mechanism to reduce the voltage of the DC link to offset the influence of the load fluctuation.

2. The control method for rapid charging of a train according to claim 1, characterized in that: The method of charging the vehicle battery with a constant current according to the determined target current value includes: The vehicle battery is charged with a constant current according to the set default current value, and the rising rate of the current vehicle battery voltage is detected; According to the set corresponding relationship table, a target current value corresponding to the detected rising rate is determined, and the vehicle battery is charged with a constant current according to the determined target current value.

3. The train fast charging control method according to claim 1, characterized in that: The detecting that the charging start condition is met includes: When it is detected that the bow-rail voltage is greater than a preset first voltage threshold and less than a preset second voltage threshold, it is determined that the charging start condition is met.

4. The control method for rapid charging of a train according to claim 3, characterized in that: The detecting that the charging stop condition is met includes: When it is detected that the bow-rail voltage is greater than or equal to the second voltage threshold, it is determined that the charging stop condition is met.

5. A control system for rapid charging of trains, characterized in that: include: A constant current charging unit, used to charge the vehicle battery with a constant current according to a determined target current value after detecting that a charging start condition is met, and the determined target current value is a target current value that causes the vehicle battery voltage to rise at a set rate; A constant power charging unit, used to charge the vehicle battery at a constant power when the voltage of the vehicle battery rises to a first switching voltage value; A constant voltage charging unit, used to charge the vehicle battery at a constant voltage when the voltage of the vehicle battery rises to a second switching voltage value; A charging stop unit, configured to stop charging after detecting that a charging stop condition is met; wherein the first switching voltage value is lower than the second switching voltage value; The constant current charging unit is specifically used for: After detecting that the charging start condition is met, the vehicle battery is charged with a constant current according to a set default current value, and the default current value is adjusted to a target current value based on feedback control, so that when the vehicle battery is charged with a constant current according to the target current value, the vehicle battery voltage rises at a set rate; Voltage fluctuation adjustment unit, used for: When it is detected that the voltage of the DC link in the charging device rises due to the AC grid voltage fluctuation, the rectifier circuit is controlled by a preset adjustment mechanism to reduce the voltage of the DC link to offset the influence of the AC grid voltage fluctuation; When it is detected that the voltage of the DC link in the charging device rises due to load fluctuation, the chopper circuit is controlled through a preset adjustment mechanism to reduce the voltage of the DC link to offset the influence of the load fluctuation.

6. The train fast charging control system according to claim 5, characterized in that: The constant current charging unit is specifically used for: After detecting that the charging start condition is met, the vehicle battery is charged with a constant current according to the set default current value, and the current vehicle battery voltage rise rate is detected; According to the set correspondence table, a target current value corresponding to the detected rising rate is determined, and the vehicle battery is charged with a constant current according to the determined target current value, so that the vehicle battery voltage rises at the set rate.

7. The train fast charging control system according to claim 5, characterized in that: The constant current charging unit is specifically used for: When it is detected that the bow rail voltage is greater than a preset first voltage threshold and less than a preset second voltage threshold, it is determined that the charging start condition is met; The vehicle battery is charged with a constant current according to the determined target current value, and the determined target current value is a target current value that causes the vehicle battery voltage to rise at a set rate.

8. The train fast charging control system according to claim 7, characterized in that: The charging stop unit is specifically used for: When it is detected that the bow-rail voltage is greater than or equal to the second voltage threshold, it is determined that the charging stop condition is met and charging is stopped.

9. A control device for rapid charging of a train, characterized in that: include: Memory for storing computer programs; A processor, configured to execute the computer program to implement the steps of the method for controlling rapid charging of a train as described in any one of claims 1 to 4.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method for controlling rapid charging of a train as described in any one of claims 1 to 4 are implemented.

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