Energy control method and energy control system of railway vehicle

Abstract

The embodiment of the invention discloses an energy control method and an energy control system of a railway vehicle. The method comprises the steps of determining an energy control mode in response to an energy control request, determining a battery group in response to the energy control mode, and obtaining the capacitance power of a capacitance energy storage cabinet and the total battery power of the battery group, and controlling one or two or three of the first bidirectional direct-current converter, the second bidirectional direct-current converter and the third bidirectional direct-current converter to execute an operation matched with an energy control mode based on the target power, the capacitor power and the total battery power. According to the method provided by the embodiment of the invention, the characteristics of the capacitance energy storage cabinet and the battery energy storage cabinet can be integrated, the interference of surge current is inhibited based on the capacitance energy storage cabinet, and the energy storage capacity and the power supply capacity are improved based on the high energy density of the battery energy storage cabinet, so that the braking energy and traction energy utilization capacity can be improved; energy consumption is saved; and energy utilization rate is improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of rail energy recovery technology, and in particular, to an energy control method and an energy control system for a rail vehicle. Background Art

[0002] The energy generated by subway trains during braking is usually consumed in the form of heat. When the braking voltage exceeds the preset voltage range, the relevant technology uses resistance braking to brake the subway train. The braking energy is consumed as heat through the braking resistor. The generated heat is dissipated in the subway tunnel, causing the temperature in the tunnel to increase year by year. In addition, the traction power of the subway train during traction comes entirely from the power provided by the power grid, and the power consumption is relatively high. Therefore, the relevant technology has shortcomings in utilizing braking energy and traction energy. Summary of the invention

[0003] One purpose of the embodiments of the present application is to provide an energy control method and an energy control system for a rail vehicle, so as to improve the technical problems that the related technologies are insufficient in utilizing braking energy and traction energy.

[0004] In a first aspect, an embodiment of the present application provides an energy control method for a rail vehicle, which is applied to an energy control system, wherein the energy control system includes a first bidirectional DC converter, a capacitor energy storage cabinet, a second bidirectional DC converter, a battery energy storage cabinet, a third bidirectional DC converter and a controller, wherein the first bidirectional DC converter and the second bidirectional DC converter are both configured to be electrically connected to a DC bus, the capacitor energy storage cabinet is electrically connected to the first bidirectional DC converter, the battery energy storage cabinet is electrically connected to the second bidirectional DC converter, and the third bidirectional DC converter is electrically connected between the capacitor energy storage cabinet and the battery energy storage cabinet, the controller is electrically connected to the first bidirectional DC converter, the capacitor energy storage cabinet, the second bidirectional DC converter, the battery energy storage cabinet and the third bidirectional DC converter respectively, the battery energy storage cabinet includes a plurality of battery modules, and the energy control method includes:

[0005] In response to an energy control request, determining an energy control mode, wherein the energy control request is used to request the energy control system to process a target power;

[0006] In response to the energy control mode, a battery group is determined, wherein the battery group includes a plurality of target battery modules, and the target battery modules are battery modules in the battery energy storage cabinet that match preset screening conditions;

[0007] Obtaining the capacitor power of the capacitor energy storage cabinet and the total battery power of the battery group;

[0008] Based on the target power, the capacitor power and the total battery power, one, two or three of the first bidirectional DC converter, the second bidirectional DC converter and the third bidirectional DC converter are controlled to perform operations matching the energy control mode.

[0009] Optionally, the energy control mode includes a braking energy recovery mode, and in response to the energy control mode, determining the battery group includes:

[0010] In response to the braking energy recovery mode, determining the remaining battery energy of each of the battery modules;

[0011] Arrange the remaining energy of the batteries of all the battery modules in order from small to large;

[0012] In order from small to large, the first battery module whose remaining battery energy is greater than or equal to the preset warning value is traversed as the first-end battery module;

[0013] Accumulating the remaining energy of the head-end battery module and the batteries arranged in the head-end battery module in order from small to large, to obtain the energy accumulation value of each accumulation operation;

[0014] In response to the energy accumulation value being greater than or equal to the preset power supply value, determining that the battery module for this accumulation operation is a terminal battery module, the head-end battery module, the terminal battery module and the battery module located between the head-end battery module and the terminal battery module form a power supply group, and the battery modules of the power supply group are used to provide power to the load;

[0015] Eliminating the battery modules of the power supply group from all the battery modules to obtain the remaining plurality of battery modules;

[0016] A battery group is determined based on the remaining plurality of battery modules.

[0017] Optionally, the operation of controlling one, two, or three of the first bidirectional DC converter, the second bidirectional DC converter, and the third bidirectional DC converter to perform matching the energy control mode based on the target power, the capacitor power, and the total battery power includes:

[0018] Calculating the sum of the capacitor power and the total battery power to obtain a total charging power;

[0019] In response to the target power being greater than the total charging power, controlling the working state of the first bidirectional DC converter so that the capacitor energy storage cabinet recovers energy transmitted via the DC bus according to the capacitor power, and controlling the working state of the second bidirectional DC converter so that the battery group recovers energy transmitted via the DC bus according to the total battery power; or,

[0020] In response to the target power being less than or equal to the total charging power, one, two, or three of the first bidirectional DC converter, the second bidirectional DC converter, and the third bidirectional DC converter are controlled to perform energy recovery operations based on the target power and the capacitor power.

[0021] Optionally, controlling one, two, or three of the first bidirectional DC converter, the second bidirectional DC converter, and the third bidirectional DC converter to perform an energy recovery operation based on the target power and the capacitor power includes:

[0022] In response to the target power being greater than the capacitor power, controlling the working state of the first bidirectional DC converter so that the capacitor energy storage cabinet recovers energy transmitted via the DC bus according to the capacitor power, and controlling the working state of the second bidirectional DC converter so that the battery group recovers energy transmitted via the DC bus according to the difference between the target power and the capacitor power; or,

[0023] In response to the target power being less than or equal to the capacitor power, the working state of the second bidirectional DC converter is controlled so that the capacitor energy storage cabinet recovers energy transmitted via the DC bus according to the target power.

[0024] Optionally, after responding that the target power is less than the capacitor power, the method further includes:

[0025] Determining the remaining energy of the capacitor of the capacitor energy storage cabinet;

[0026] In response to the remaining energy of the capacitor being less than a preset energy threshold, the working state of the third bidirectional DC converter is controlled to enable the battery group to provide energy to the capacitor energy storage cabinet.

[0027] Optionally, before the capacitor energy storage cabinet and the battery group recover the energy transmitted via the DC bus, the method further includes:

[0028] In response to the remaining energy of the capacitor being less than a preset pre-charge threshold, the working state of the third bidirectional DC converter is controlled to enable the battery group to transfer energy to the capacitor energy storage cabinet until the remaining energy of the capacitor of the capacitor energy storage cabinet is greater than the preset pre-charge threshold, and the preset pre-charge threshold is less than the preset energy threshold.

[0029] Optionally, the energy control mode includes a traction energy release mode, and in response to the energy control mode, determining the battery group includes:

[0030] In response to the traction energy release mode, determining the remaining battery energy of each of the battery modules;

[0031] Among the remaining battery energies of all the battery modules, the battery modules whose remaining battery energies are greater than a preset allowable discharge value are screened out to form a battery group.

[0032] Optionally, the operation of controlling one, two, or three of the first bidirectional DC converter, the second bidirectional DC converter, and the third bidirectional DC converter to perform matching the energy control mode based on the target power, the capacitor power, and the total battery power includes:

[0033] Calculating the sum of the capacitor power and the total battery power to obtain a total discharge power;

[0034] In response to the target power being greater than the total discharge power, controlling the working state of the first bidirectional DC converter so that the capacitor energy storage cabinet releases energy to the DC bus according to the capacitor power, and controlling the working state of the second bidirectional DC converter so that the battery group releases energy to the DC bus according to the total battery power; or,

[0035] In response to the target power being less than or equal to the total discharge power, one, two, or three of the first bidirectional DC converter, the second bidirectional DC converter, and the third bidirectional DC converter are controlled to perform energy release operations based on the target power and the capacitor power.

[0036] Optionally, the energy control mode includes an energy scheduling mode, and the operation of controlling one, two, or three of the first bidirectional DC converter, the second bidirectional DC converter, and the third bidirectional DC converter to perform matching the energy control mode based on the target power, the capacitor power, and the total battery power includes:

[0037] Determine the capacitor scheduling power of the capacitor energy storage cabinet and the battery scheduling power of the battery group, the capacitor scheduling power is the maximum power that the capacitor energy storage cabinet can output, and the battery scheduling power is the maximum power that the battery group can output;

[0038] Controlling the working state of the first bidirectional DC converter so that the capacitor energy storage cabinet releases energy to the DC bus according to the capacitor scheduling power;

[0039] The working state of the second bidirectional DC converter is controlled so that the battery group releases energy according to the battery scheduling power.

[0040] In a second aspect, an embodiment of the present application provides an energy control system, including a first bidirectional DC converter, a capacitor energy storage cabinet, a second bidirectional DC converter, a battery energy storage cabinet, a third bidirectional DC converter and a controller, wherein the first bidirectional DC converter and the second bidirectional DC converter are both configured to be electrically connected to a DC bus, the capacitor energy storage cabinet is electrically connected to the first bidirectional DC converter, the battery energy storage cabinet is electrically connected to the second bidirectional DC converter, the third bidirectional DC converter is electrically connected between the capacitor energy storage cabinet and the battery energy storage cabinet, the controller is electrically connected to the first bidirectional DC converter, the capacitor energy storage cabinet, the second bidirectional DC converter, the battery energy storage cabinet and the third bidirectional DC converter respectively, the battery energy storage cabinet includes a plurality of battery modules, and the controller is configured to execute the above-mentioned rail vehicle energy control method.

[0041] The embodiments of the present application can achieve the following technical effects: the energy control system provided by the embodiments of the present application can integrate the characteristics of the capacitor energy storage cabinet and the battery energy storage cabinet, suppress the interference of surge current based on the capacitor energy storage cabinet, and improve the energy storage capacity and power supply capacity based on the high energy density of the battery energy storage cabinet, so as to improve the ability to utilize braking energy and traction energy, save energy consumption and improve energy utilization. In addition, the embodiments of the present application can dynamically determine the battery group according to the energy control mode, ensure that the battery module of the battery group can adapt to the requirements of the energy control mode, and improve the reliability of the battery group in participating in the recovery process of braking energy and the release process of traction energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0043] Figure 1 A schematic diagram of the system architecture of an energy recovery system provided for a related technology;

[0044] Figure 2 A schematic diagram of the system architecture of an energy recovery system provided for another related technology;

[0045] Figure 3 A schematic diagram of the system architecture of an energy control system provided in an embodiment of the present application;

[0046] Figure 4 A topological diagram of a battery energy storage cabinet provided in an embodiment of the present application;

[0047] Figure 5A schematic diagram of a flow chart of an energy control method provided in an embodiment of the present application;

[0048] Figure 6 A schematic diagram of energy scheduling based on an energy control system provided in an embodiment of the present application;

[0049] Figure 7 A schematic diagram of the structure of an energy control device provided in an embodiment of the present application;

[0050] Figure 8 A schematic diagram of the structure of a controller provided in an embodiment of the present application. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0052] It should be noted that, if there is no conflict, the various features in the embodiments of the present application can be combined with each other, all within the scope of protection of the present application. In addition, although the functional module division is performed in the device schematic diagram and the logical order is shown in the flow chart, in some cases, the steps shown or described can be performed in a sequence different from the module division in the device or the flow chart. Furthermore, the words "first", "second", "third", etc. used in this application do not limit the data and execution order, but only distinguish the same items or similar items with basically the same functions and effects.

[0053] In addition to the shortcomings of the related art pointed out in the background technology, the related art also has the following shortcomings, which are as follows:

[0054] See also Figure 1 , the related technology provides an energy recovery system. Figure 1 As shown, the first energy recovery system includes a first chopper 11, a super capacitor cabinet 12 and a first inverter 13. When the subway train enters the station and brakes, the first chopper 11 converts the energy transmitted via the DC bus to the super capacitor cabinet 12 for storage. The super capacitor cabinet 12 inverts the energy into AC power through the first inverter 13 and feeds it back to the AC power grid.

[0055] Although the supercapacitor cabinet 12 can effectively offset the impact of surge current generated during braking, the energy recovered by the supercapacitor cabinet 12 cannot be fed back to the DC bus. When the subway train leaves the station and starts, the traction energy required by the subway train needs to be provided entirely by the power grid.

[0056] See also Figure 2 , the related art provides another energy recovery system. Figure 2 As shown, the second energy recovery system includes a second chopper 21, a battery energy storage cabinet 22 and a second inverter 23. When the subway train enters the station and brakes, the second chopper 21 converts the energy transmitted via the DC bus to the battery energy storage cabinet 22 for storage. The battery energy storage cabinet 22 inverts the energy into AC power through the second inverter 23 and feeds it back to the AC power grid. The battery energy storage cabinet 22 is easily affected by the surge current generated during braking, and when the subway train leaves the station and starts, the traction energy required by the subway train needs to be provided entirely by the power grid.

[0057] Based on this, the embodiment of the present application provides an energy control system. The energy control system provided by the embodiment of the present application can integrate the characteristics of the capacitor energy storage cabinet and the battery energy storage cabinet, based on the capacitor energy storage cabinet to suppress the interference of surge current, based on the high energy density of the battery energy storage cabinet to improve the energy storage capacity and power supply capacity, so as to improve the ability to utilize braking energy and traction energy, save energy consumption and improve energy utilization. In addition, the embodiment of the present application can dynamically determine the battery group according to the energy control mode, ensure that the battery module of the battery group can adapt to the requirements of the energy control mode, and improve the reliability of the battery group in participating in the recovery process of braking energy and the release process of traction energy.

[0058] See also Figure 3 The energy control system includes a first bidirectional DC converter 31, a capacitor energy storage cabinet 32, a second bidirectional DC converter 33, a battery energy storage cabinet 34, a third bidirectional DC converter 35 and a controller 36.

[0059] The first bidirectional DC converter 31 and the second bidirectional DC converter 33 are both electrically connected to the DC bus 37, the capacitor energy storage cabinet 32 ​​is electrically connected to the first bidirectional DC converter 31, and the controller 36 is electrically connected to the first bidirectional DC converter 31 and the capacitor energy storage cabinet 32 ​​respectively. The controller 36 can control the first bidirectional converter 31 to work in the first working state, so that the first bidirectional converter 31 performs voltage reduction processing on the energy transmitted via the DC bus 37, so that the energy after the voltage reduction processing is stored in the capacitor energy storage cabinet 32. Alternatively, the controller 36 can control the first bidirectional converter 31 to work in the second working state, so that the first bidirectional converter 31 performs voltage increase processing on the energy released by the capacitor energy storage cabinet 32, so that the energy after the voltage increase processing is applied to the DC bus 37.

[0060] The capacitor energy storage cabinet 32 ​​includes a plurality of MKP capacitors, and the parameters of the MKP capacitors are 150uF / 2200V. The calculation and selection of the MKP capacitors are as follows: the braking time of the subway entering the station is T, the energy required for each entry is Q (kwh), the voltage of the subway DC bus is 1500V, and the MKP ripple isΔ V, ripple current is Δ I. The power generation (i.e. braking power) of the brake motor is Po, then:

[0061] The energy storage formula of MKP capacitor is: Q(kwh)=C*ΔV*ΔV / (2*3600)

[0062] The ripple current formula of the MKP capacitor is: ΔI=Po / Vdc*20%.

[0063] Since the current generated by the brake motor has surge characteristics and pulse characteristics, the MKP capacitor is used to suppress the surge current and pulse current and balance the relationship between the power grid and the first bidirectional DC converter 31. Those skilled in the art can reasonably select the total capacity and total ripple current of the MKP capacitor according to the above two formulas, and can reasonably select the number of MKP capacitors in combination with the specifications of the MKP capacitor so as to reasonably design the capacitor energy storage cabinet 32.

[0064] The battery energy storage cabinet 34 is electrically connected to the second bidirectional DC converter 33, and the controller 36 is electrically connected to the second bidirectional DC converter 33 and the battery energy storage cabinet 34, respectively. The controller 36 can control the second bidirectional DC converter 33 to work in the first working state, so that the second bidirectional DC converter 33 performs voltage reduction processing on the energy transmitted via the DC bus 37, so that the energy after the voltage reduction processing is stored in the battery energy storage cabinet 34. Alternatively, the controller 36 can control the second bidirectional DC converter 33 to work in the second working state, so that the second bidirectional DC converter 33 performs voltage increase processing on the energy released by the battery energy storage cabinet 34, so that the energy after the voltage increase processing is applied to the DC bus 37.

[0065] The third bidirectional DC converter 35 is electrically connected between the capacitor energy storage cabinet 32 ​​and the battery energy storage cabinet 34. The controller 36 can control the third bidirectional DC converter 35 to work in a first working state, so that the third bidirectional DC converter 35 transfers the energy of the capacitor energy storage cabinet 32 ​​to the battery energy storage cabinet 34 for storage. Alternatively, the controller 36 can control the third bidirectional DC converter 35 to work in a second working state, so that the third bidirectional DC converter 35 transfers the energy of the battery energy storage cabinet 34 to the capacitor energy storage cabinet 32 ​​for storage.

[0066] The battery energy storage cabinet 34 supports a variety of battery topologies. In some embodiments, see Figure 4 The battery energy storage cabinet 34 includes a plurality of switch units 341 and a plurality of battery modules, wherein one switch unit 341 corresponds to one battery module. Figure 4 As shown, the plurality of battery modules are battery module 34#1, battery module 34#2, battery module 34#3, ..., battery module 34#n.

[0067] Each switch unit 341 includes a first switch S1 and a second switch S2. One end of the first switch S1 is electrically connected to the output end of the corresponding battery module, and the other end of the first switch S1 is electrically connected to the first bus bar L1. One end of the second switch S2 is electrically connected to the output end of the corresponding battery module, and the other end of the second switch S2 is electrically connected to the second bus bar L2. The first bus bar L1 is used to receive energy input, and the second bus bar L2 is used to output energy.

[0068] The first switch S1 and the second switch S2 are in an interlocked state, and the switch state of the first switch S1 and the switch state of the second switch S2 are mutually exclusive, that is, when the first switch S1 enters the on state, the second switch S2 enters the off state. When the first switch S1 enters the off state, the second switch S2 enters the on state.

[0069] The embodiment of the present application can set some battery modules of the battery energy storage cabinet 34 in a charging state and set other battery modules in a discharging state. For example, assuming that each battery module can receive or output 4kw of battery power, if some battery modules are needed to discharge other equipment on the subway system, other battery modules need to enter a charging state to receive the braking energy generated when the subway train brakes, where the discharge power is 16kw and the braking power is 50kw.

[0070] The embodiment of the present application controls the first switch S1 of battery module 34#1, battery module 34#2, battery module 34#3 and battery module 34#4 to enter the off state, and the second switch S2 to enter the on state. Therefore, the power supply group composed of battery module 34#1, battery module 34#2, battery module 34#3 and battery module 34#4 can output 16Kw power to other equipment in the subway system through the second bus L2.

[0071] The embodiment of the present application controls the first switch S1 of battery module 34#5 to battery module 34#n to enter the on state and the second switch S2 to enter the off state. Therefore, the battery group composed of battery module 34#5 to battery module 34#n can receive 50kw power input through the first bus L1.

[0072] Hereinafter, an embodiment of the present application provides an energy control method for a rail vehicle, which is applied to the energy control system described in each of the above embodiments, wherein the rail vehicle includes a subway train or a vehicle in the form of a track.

[0073] See also Figure 5 , the energy control method includes steps S51 to S54.

[0074] The embodiment of the present application executes step S51 to respond to the energy control request and determine the energy control mode.

[0075] The energy control request is used to request the energy control system to process the target power, and the energy control mode is the mode in which the energy control system processes the target power.

[0076] In some embodiments, the target power is the power generated when the rail vehicle enters a braking state.

[0077] In some embodiments, the target power is the power generated when the rail vehicle enters a traction state.

[0078] In some embodiments, the target power is the power that other energy control systems request to dispatch energy.

[0079] In some embodiments, the energy control request includes an energy recovery request, and correspondingly, the energy control mode includes an energy recovery mode, which is used to request the capacitor storage cabinet and / or battery group to recover energy corresponding to the target power when the rail vehicle is in a braking state.

[0080] Responding to the energy control request and determining the energy control mode includes the following steps: responding to the rail vehicle entering a braking state, generating an energy recovery request, responding to the energy recovery request, and determining the energy recovery mode as the energy control mode.

[0081] In some embodiments, the energy control request includes an energy release request, and correspondingly, the energy control mode includes an energy release mode, which is used to request the capacitor storage cabinet and / or battery group to release energy according to the target power when the rail vehicle is in the traction state.

[0082] Responding to the energy control request and determining the energy control mode includes the following steps: responding to the rail vehicle entering the traction state, generating an energy release request, responding to the energy release request, and determining the energy release mode as the energy control mode.

[0083] In some embodiments, the energy control request includes an energy scheduling request, and correspondingly, the energy control mode includes an energy scheduling mode, and the energy scheduling mode is used to schedule energy stored in the capacitor storage cabinet and / or the battery group according to the target power.

[0084] Responding to the energy control request and determining the energy control mode includes the following steps: receiving an energy scheduling request, responding to the energy scheduling request, and determining the energy scheduling mode as the energy control mode.

[0085] The embodiment of the present application executes step S52, responds to the energy control mode, determines a battery group, and the battery group includes multiple target battery modules. The target battery modules are battery modules in the battery energy storage cabinet that match preset screening conditions.

[0086] In some embodiments, in order to avoid frequent switching between the charging state and the discharging state of the same battery module, the embodiment of the present application responds to the energy control mode and performs the operation of determining the battery group at each preset time interval. The preset time is customized by the designer based on engineering experience.

[0087] The preset screening condition refers to screening out the battery modules that can perform the operation corresponding to the energy control mode from all the battery modules of the battery energy storage cabinet. It is understandable that the preset screening condition can be customized by the designer based on engineering experience.

[0088] In some embodiments, the present application embodiment selects one-half of the battery modules from all the battery modules in the battery energy storage cabinet as the battery group.

[0089] In other embodiments, the embodiments of the present application screen out battery modules capable of performing operations corresponding to the energy control mode from all battery modules of the battery energy storage cabinet according to the type of the energy control mode.

[0090] Hereinafter, the embodiments of the present application respectively describe the specific operations of determining the battery group in the three cases of the braking energy recovery mode, the traction energy release mode, and the energy dispatch mode. It can be understood that the specific operations of determining the battery group in the traction energy release mode and the energy dispatch mode are the same. Herein, only the specific operations of determining the battery group in the traction energy release mode are described, and no description is given for the specific operations of determining the battery group in the energy dispatch mode. As shown below:

[0091] In some embodiments, the energy control mode includes a braking energy recovery mode, and in response to the energy control mode, determining the battery group includes the following steps:

[0092] S521: In response to the braking energy recovery mode, determine the remaining battery energy of each battery module.

[0093] S522: Arrange the remaining battery energies of all battery modules in order from small to large.

[0094] S523: In order from small to large, the first battery module whose remaining battery energy is greater than or equal to the preset warning value is traversed as the first-end battery module.

[0095] S524: accumulating the remaining energies of the first-end battery module and the batteries arranged in the first-end battery module in order from small to large, and obtaining the energy accumulation value of each accumulation operation.

[0096] S525: In response to the energy accumulation value being greater than or equal to the preset power supply value, it is determined that the battery module for this accumulation operation is the terminal battery module, and the head-end battery module, the terminal battery module and the battery module located between the head-end battery module and the terminal battery module form a power supply group, and the battery modules of the power supply group are used to provide power to the load.

[0097] S526: Eliminate the battery modules of the power supply group from all the battery modules to obtain the remaining multiple battery modules.

[0098] S527: Determine a battery group based on the remaining plurality of battery modules.

[0099] In S521, the embodiment of the present application obtains a battery remaining energy set based on the battery remaining energy (State of Charge, SOC) of each battery module based on the SOC estimation algorithm. The expression of the battery remaining energy set is W0 = {soc1, soc2, soc3, ..., soci, ..., soc16}, where soci is the battery remaining energy of the i-th battery module.

[0100] In S522, the embodiment of the present application sorts the battery remaining energy set in order from small to large, for example, the sorted battery remaining energy set W1 = {soc3, soc6, soc4, soc2, soc7, soc1, soc16..., soc10}.

[0101] In S523, in order to prevent battery modules with too low energy from being added to the battery group for discharge, the embodiment of the present application sets a preset warning value in the braking energy recovery mode to include such battery modules in the battery group so as to charge such battery modules. When the remaining battery energy of the battery module is greater than or equal to the preset warning value, it means that the remaining battery energy of this battery module can meet the discharge requirements.

[0102] In the embodiment of the present application, the battery module whose first remaining battery energy is greater than or equal to the preset warning value is traversed in order from small to large, and is the first-end battery module. For example, soc3, soc6, and soc4 are all less than the preset warning value, and soc2 is the first battery remaining energy greater than or equal to the preset warning value. Therefore, the battery module 34#2 corresponding to soc2 is the first-end battery module.

[0103] In S524, the embodiment of the present application takes battery module 34#2 as the leading battery module, and sequentially obtains and accumulates the remaining battery energy of the battery modules arranged after battery module 34#2. For example, the embodiment of the present application obtains the remaining battery energy soc7 of battery module 34#7, and soc7+soc2=soc'. If soc' is less than the preset power supply value, the embodiment of the present application continues to obtain and accumulate the remaining battery energy of the battery modules arranged after battery module 34#7, that is: soc′+soc1=soc", and so on.

[0104] The preset power supply value is the maximum energy value that the energy control system provides to the fixed loads of the subway track (such as fans or lighting systems, etc.). When the accumulated energy value is greater than or equal to the preset power supply value, it means that the terminal battery module has been found in the embodiment of the present application. For example, soc″+soc16=soc″′, and soc″′ is greater than the preset power supply value. Therefore, the embodiment of the present application combines battery module 34#2, battery module 34#7, battery module 34#1 and battery module 34#16 into power supply group W2.

[0105] In S525, the embodiment of the present application removes the battery modules of the power supply group from all the battery modules to obtain the remaining multiple battery modules. For example, the embodiment of the present application removes battery module 34#2, battery module 34#7, battery module 34#1 and battery module 34#16 from {34#1, 34#2, 34#3, ..., 34#16} to obtain the remaining multiple battery modules:

[0106] W3={34#3,34#4,34#5,34#6,34#8,34#9,34#10,34#11,34#12,34#13,34#14,34#15}.

[0107] Power supply group W2 = {34#2, 34#7, 34#1, 34#16}.

[0108] In S526, in some embodiments, the embodiments of the present application directly form a battery group with the remaining multiple battery modules. In some embodiments, the embodiments of the present application eliminate the battery modules whose remaining battery energy is greater than a preset stop charging threshold from the remaining multiple battery modules to obtain a battery group. The designer customizes the stop charging threshold based on engineering experience, for example, the stop charging threshold is 90%. The embodiments of the present application will eliminate the battery modules whose remaining battery energy is greater than the stop charging threshold to ensure that the target power in the braking energy recovery mode can be allocated to the battery modules that need to be charged, so as to improve the charging efficiency of the battery modules in the braking energy recovery mode.

[0109] The embodiment of the present application can dynamically divide each battery module to form a battery group and a power supply group, while taking into account the situations of low-power battery modules and high-power battery modules. The low-power battery modules are divided into the battery group so as to be charged in the braking energy recovery mode to avoid power exhaustion and damage to the battery modules. The high-power battery modules are stopped from joining the battery group to avoid the high-power battery modules occupying the target power, thereby ensuring that the low-power battery modules have sufficient energy for charging.

[0110] In other embodiments, the energy control mode includes a traction energy release mode, and determining the battery group in response to the energy control mode includes the following steps: responding to the traction energy release mode, determining the remaining battery energy of each battery module, and screening out the battery modules whose remaining battery energy is greater than a preset allowable discharge value from the remaining battery energies of all battery modules to form a battery group.

[0111] The capacitor energy storage cabinet and / or the battery energy storage cabinet feed back energy to the DC bus in the traction energy release mode. In order to prevent the battery module with too low energy from discharging to the outside, the embodiment of the present application forms a battery group with each battery module whose remaining battery energy is greater than the allowable discharge value, wherein the allowable discharge value is customized by the designer based on engineering experience, for example, the allowable discharge value is 60% of the maximum battery energy.

[0112] The embodiment of the present application executes step S53 to obtain the capacitor power of the capacitor energy storage cabinet and the total battery power of the battery group. The capacitor power is the sum of the power of all MKP capacitors in the capacitor energy storage cabinet, and the total battery power is the sum of the power of all battery modules in the battery group.

[0113] The embodiment of the present application executes step S54 to control one, two or three of the first bidirectional DC converter, the second bidirectional DC converter and the third bidirectional DC converter to perform an operation matching the energy control mode based on the target power, the capacitor power and the total battery power.

[0114] Hereinafter, the embodiments of the present application provide detailed descriptions of the related operations for the three cases where the energy control modes are respectively the braking energy recovery mode, the traction energy release mode, and the energy scheduling mode, as follows:

[0115] 1. When the energy control mode is the braking energy recovery mode:

[0116] The operation of controlling one, two or three of the first bidirectional DC converter, the second bidirectional DC converter and the third bidirectional DC converter to perform a matching energy control mode based on the target power, the capacitor power and the total battery power includes the following steps:

[0117] S541, calculate the sum of the capacitor power and the total battery power to obtain the total charging power.

[0118] S542, in response to the target power being greater than the total charging power, controlling the working state of the first bidirectional DC converter so that the capacitor energy storage cabinet recovers energy transmitted via the DC bus according to the capacitor power, and controlling the working state of the second bidirectional DC converter so that the battery group recovers energy transmitted via the DC bus according to the total battery power.

[0119] S543, in response to the target power being less than or equal to the total charging power, controlling one, two or three of the first bidirectional DC converter, the second bidirectional DC converter and the third bidirectional DC converter to perform energy recovery operation based on the target power and the capacitor power.

[0120] In S541, the embodiment of the present application adds the capacitor power to the total battery power to obtain the total charging power.

[0121] In S542, if the target power is greater than the total charging power, it means that the target power can meet the charging requirements of the capacitor energy storage cabinet and the battery group at the same time. Therefore, the embodiment of the present application controls the working state of the first bidirectional DC converter so that the first bidirectional DC converter can convert part of the energy transmitted via the DC bus into energy corresponding to the capacitor power and provide it to the capacitor energy storage cabinet for storage. At the same time, the embodiment of the present application controls the working state of the second bidirectional DC converter so that the second bidirectional DC converter can convert part of the energy transmitted via the DC bus into energy corresponding to the total battery power and provide it to the battery group for storage.

[0122] In S543, if the target power is less than or equal to the total charging power, it means that the target power cannot meet the charging requirements of the capacitor energy storage cabinet and the battery group at the same time. The embodiment of the present application needs to perform finer-grained control operations based on the target power and the capacitor power.

[0123] In some embodiments, controlling one or two or three of the first bidirectional DC converter, the second bidirectional DC converter, and the third bidirectional DC converter to perform an energy recovery operation based on the target power and the capacitor power includes the following steps: in response to the target power being greater than the capacitor power, controlling the working state of the first bidirectional DC converter so that the capacitor energy storage cabinet recovers energy transmitted via the DC bus according to the capacitor power, and controlling the working state of the second bidirectional DC converter so that the battery group recovers energy transmitted via the DC bus according to the difference between the target power and the capacitor power; in response to the target power being less than or equal to the capacitor power, controlling the working state of the second bidirectional DC converter so that the capacitor energy storage cabinet recovers energy transmitted via the DC bus according to the target power.

[0124] The charging efficiency of the battery module is easily limited by the internal chemical reaction of the battery, but the battery module has a high energy density and can store more energy, stably providing power for the fixed loads of the subway system or for the capacitor energy storage cabinet. The capacitor energy storage cabinet has a fast charging and discharging speed, and the supercapacitor can complete the charging and discharging process in a short time with low performance loss. Based on the above characteristics, and taking into account the frequent entry and exit of subway trains, the embodiment of the present application adopts a strategy of preferentially providing power to the capacitor energy storage cabinet and then providing power to the battery group. Therefore, under the premise that the target power is less than or equal to the total charging power, the embodiment of the present application preferentially compares the target power with the capacitor power.

[0125] If the target power is greater than the capacitor power, it means that the target power can overflow with additional power to be applied to the battery group while satisfying the capacitor energy storage cabinet. Therefore, the embodiment of the present application controls the working state of the first bidirectional DC converter so that the capacitor energy storage cabinet recovers the energy transmitted through the DC bus according to the capacitor power, and controls the working state of the second bidirectional DC converter so that the battery group recovers the energy transmitted through the DC bus according to the difference between the target power and the capacitor power.

[0126] If the target power is less than or equal to the capacitor power, it means that the target power can only be satisfied by the capacitor energy storage cabinet. Therefore, the embodiment of the present application controls the working state of the second bidirectional DC converter so that the capacitor energy storage cabinet recovers the energy transmitted through the DC bus according to the target power.

[0127] In the braking energy recovery mode, the embodiments of the present application take into account the frequent entry and exit of subway trains, and comprehensively consider the advantages and disadvantages of battery modules and capacitor energy storage cabinets to provide implementation methods for the above-mentioned embodiments to ensure that the energy control system can reliably and quickly recover braking energy.

[0128] In some embodiments, after responding that the target power is less than the capacitor power, the method further includes: determining the remaining energy of the capacitor of the capacitor energy storage cabinet, responding that the remaining energy of the capacitor is less than a preset energy threshold, controlling the working state of the third bidirectional DC converter so that the battery group provides energy to the capacitor energy storage cabinet, and responding that the remaining energy of the capacitor is greater than or equal to the preset energy threshold, maintaining the current state of the capacitor energy storage cabinet and the battery group.

[0129] The preset energy threshold is customized by the designer based on engineering experience, for example, the preset energy threshold is 60% of the maximum capacity of the capacitor energy storage cabinet. When the remaining energy of the capacitor is less than the preset energy threshold, it means that the capacitor energy storage cabinet is not in a fully charged state. Therefore, the embodiment of the present application can control the working state of the third bidirectional DC converter so that the battery group provides energy to the capacitor energy storage cabinet until the capacitor energy storage cabinet enters a fully charged state.

[0130] In some embodiments, before the capacitor energy storage cabinet and the battery group recover energy transmitted via the DC bus, the method further includes: in response to the remaining energy of the capacitor being less than a preset pre-charge threshold, controlling the working state of the third bidirectional DC converter to enable the battery group to transmit energy to the capacitor energy storage cabinet until the remaining energy of the capacitor of the capacitor energy storage cabinet is greater than the preset pre-charge threshold, the preset pre-charge threshold is less than the preset energy threshold, and in response to the remaining energy of the capacitor being greater than or equal to the preset pre-charge threshold, maintaining the current state of the capacitor energy storage cabinet and the battery group.

[0131] The preset pre-charge threshold is customized by the designer based on engineering experience. For example, the preset energy threshold is 10% of the maximum capacity of the capacitor energy storage cabinet.

[0132] When the capacitor energy storage cabinet has no power, the surge current generated instantly during braking can easily cause the capacitor energy storage cabinet to short-circuit, which can easily cause a dangerous accident. Therefore, in the embodiment of the present application, when the remaining energy of the capacitor is less than the preset pre-charge threshold, the working state of the third bidirectional DC converter is controlled to enable the battery group to transmit energy to the capacitor energy storage cabinet, so that the capacitor energy storage cabinet completes the pre-charge operation, avoids short-circuit during subsequent charging, and improves the reliability of recovering braking energy.

[0133] 2. When the energy control mode is the traction energy release mode:

[0134] The operation of controlling one, two or three of the first bidirectional DC converter, the second bidirectional DC converter and the third bidirectional DC converter to perform a matching energy control mode based on the target power, the capacitor power and the total battery power includes the following steps:

[0135] S544, calculating the sum of the capacitor power and the total battery power to obtain the total discharge power.

[0136] S545, in response to the target power being greater than the total discharge power, controlling the working state of the first bidirectional DC converter so that the capacitor energy storage cabinet releases energy to the DC bus according to the capacitor power, and controlling the working state of the second bidirectional DC converter so that the battery group releases energy to the DC bus according to the total battery power.

[0137] S546, in response to the target power being less than or equal to the total discharge power, controlling one, two, or three of the first bidirectional DC converter, the second bidirectional DC converter, and the third bidirectional DC converter to perform an energy release operation based on the target power and the capacitor power.

[0138] In S544, the embodiment of the present application adds the capacitor power to the total battery power to obtain the total discharge power.

[0139] In S545, if the target power is greater than the total discharge power, it means that the capacitor energy storage cabinet and the battery group cannot meet the power demand of the subway train in the traction state. Therefore, the embodiment of the present application controls the capacitor energy storage cabinet to release energy to the DC bus according to the capacitor power, and controls the battery group to release energy to the DC bus according to the total battery power. If the target power is less than or equal to the total discharge power, it means that the capacitor energy storage cabinet and the battery group can meet the power demand of the subway train in the traction state. The embodiment of the present application needs to perform finer-grained control operations based on the target power and the capacitor power.

[0140] In some embodiments, controlling one or two or three of the first bidirectional DC converter, the second bidirectional DC converter, and the third bidirectional DC converter to perform an energy release operation based on the target power and the capacitor power includes the following steps: in response to the target power being greater than or equal to the capacitor power, controlling the working state of the first bidirectional DC converter so that the capacitor energy storage cabinet transmits energy to the DC bus according to the capacitor power, and controlling the working state of the second bidirectional DC converter so that the battery group releases energy to the DC bus according to the difference between the target power and the capacitor power, or, in response to the target power being less than the capacitor power, controlling the working state of the second bidirectional DC converter so that the capacitor energy storage cabinet releases energy to the DC bus according to the target power.

[0141] In the traction energy release mode, the embodiments of the present application take into account the frequent entry and exit of subway trains, and comprehensively consider the advantages and disadvantages of battery modules and capacitor energy storage cabinets to provide implementation methods for the above-mentioned embodiments to ensure that the energy control system can reliably and quickly release energy for traction of subway trains.

[0142] 3. When the energy control mode is the energy scheduling mode:

[0143] The operation of controlling one, two or three of the first bidirectional DC converter, the second bidirectional DC converter and the third bidirectional DC converter to perform a matching energy control mode based on the target power, the capacitor power and the total battery power includes the following steps:

[0144] S547, determining the capacitor dispatching power of the capacitor energy storage cabinet and the battery dispatching power of the battery group, where the capacitor dispatching power is the maximum power that the capacitor energy storage cabinet can output, and the battery dispatching power is the maximum power that the battery group can output.

[0145] S548, controlling the working state of the first bidirectional DC converter so that the capacitor energy storage cabinet releases energy to the DC bus according to the capacitor scheduling power.

[0146] S549, controlling the working state of the second bidirectional DC converter so that the battery group releases energy according to the battery scheduling power.

[0147] In S547, determining the capacitor scheduling power of the capacitor energy storage cabinet includes the following steps: obtaining a first energy difference between the remaining energy of the capacitor of the capacitor energy storage cabinet and a preset energy threshold, obtaining a scheduling time, obtaining a quotient of the first energy difference and the scheduling time, obtaining a first to-be-determined power, and selecting a maximum power between the first to-be-determined power and the capacitor power as the capacitor scheduling power.

[0148] Determining the battery scheduling power of the battery group includes the following steps: calculating the second energy difference between the total battery remaining energy of the battery group and the specified energy threshold, obtaining the scheduling time, calculating the quotient of the second energy difference and the scheduling time to obtain the second pending power, and selecting the maximum value between the second pending power and the total battery power as the battery scheduling power.

[0149] In S548, the embodiment of the present application controls the capacitor energy storage cabinet to dispatch energy according to the capacitor dispatching power so that other energy control systems receive the energy.

[0150] In S549, the embodiment of the present application controls the battery group to schedule energy according to the battery scheduling power so that other energy control systems receive the energy.

[0151] See also Figure 6 , the energy control systems of multiple subway stations are electrically connected to the same DC bus, such as Figure 6 As shown, the first energy control system 61, the second energy control system 62 and the third energy control system 63 are all electrically connected to the DC bus 64. When the first energy control system 61 is short of power and needs to dispatch energy to the second energy control system 62, the second energy control system 62 dispatches the corresponding energy to the first energy control system 61 according to the methods described in the above embodiments. In this way, the embodiment of the present application enables multiple energy control systems to form a large energy storage system to provide protection for the power system of the entire subway line.

[0152] It should be noted that, in each of the above-mentioned embodiments, there is not necessarily a certain order between the above-mentioned steps. A person skilled in the art can understand, based on the description of the embodiments of the present application, that in different embodiments, the above-mentioned steps may have different execution orders, that is, they may be executed in parallel, may be executed interchangeably, and so on.

[0153] As another aspect of the embodiment of the present application, the embodiment of the present application provides an energy control device for a rail vehicle. The energy control device for a rail vehicle can be a software module, which includes a number of instructions stored in a memory, and a processor can access the memory and call the instructions for execution to complete the energy control method for a rail vehicle described in each of the above embodiments.

[0154] In some embodiments, the energy control device of the rail vehicle can also be constructed by hardware devices. For example, the energy control device of the rail vehicle can be constructed by one or more chips, and each chip can work in coordination with each other to complete the energy control method of the rail vehicle described in each of the above embodiments. For another example, the energy control device of the rail vehicle can also be constructed by various logic devices, such as a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), a single-chip microcomputer, an ARM (Acorn RISC Machine) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination of these components.

[0155] See also Figure 7 The energy control device 700 includes a mode determination module 71, a battery group determination module 72, a power acquisition module 73 and a mode control module 74. The mode determination module 71 is used to respond to an energy control request and determine an energy control mode. The energy control request is used to request the energy control system to process the target power. The battery group determination module 72 is used to respond to the energy control mode and determine the battery group. The battery group includes multiple target battery modules. The target battery module is a battery module in the battery energy storage cabinet that matches the preset screening conditions. The power acquisition module 73 is used to obtain the capacitor power of the capacitor energy storage cabinet and the total battery power of the battery group. The mode control module 74 is used to control one or two or three of the first bidirectional DC converter, the second bidirectional DC converter, and the third bidirectional DC converter to perform operations matching the energy control mode based on the target power, the capacitor power, and the total battery power.

[0156] In some embodiments, the energy control mode includes a braking energy recovery mode, and the battery group determination module 72 is specifically used to: respond to the braking energy recovery mode, determine the remaining battery energy of each of the battery modules, arrange the remaining battery energies of all the battery modules in order from small to large, and traverse the first battery module whose remaining battery energy is greater than or equal to a preset warning value in order from small to large as the head-end battery module, and accumulate the remaining battery energies of the head-end battery modules and the batteries arranged in the head-end battery modules in sequence in order from small to large to obtain the energy accumulation value of each accumulation operation, and in response to the energy accumulation value being greater than or equal to the preset power supply value, determine that the battery module of this accumulation operation is the terminal battery module, the head-end battery module, the terminal battery module and the battery module located between the head-end battery module and the terminal battery module form a power supply group, the battery modules of the power supply group are used to provide power to the load, and the battery modules of the power supply group are eliminated from all the battery modules to obtain the remaining multiple battery modules, and the battery group is determined based on the remaining multiple battery modules.

[0157] In some embodiments, the mode control module 74 is specifically used to: calculate the sum of the capacitor power and the total battery power to obtain the total charging power, and in response to the target power being greater than the total charging power, control the working state of the first bidirectional DC converter so that the capacitor energy storage cabinet recovers the energy transmitted via the DC bus according to the capacitor power, and control the working state of the second bidirectional DC converter so that the battery group recovers the energy transmitted via the DC bus according to the total battery power; or, in response to the target power being less than or equal to the total charging power, control one or two or three of the first bidirectional DC converter, the second bidirectional DC converter, and the third bidirectional DC converter to perform energy recovery operations based on the target power and the capacitor power.

[0158] In some embodiments, the mode control module 74 is specifically used to: in response to the target power being greater than the capacitor power, control the working state of the first bidirectional DC converter so that the capacitor energy storage cabinet recovers the energy transmitted via the DC bus according to the capacitor power, and control the working state of the second bidirectional DC converter so that the battery group recovers the energy transmitted via the DC bus according to the difference between the target power and the capacitor power; or, in response to the target power being less than or equal to the capacitor power, control the working state of the second bidirectional DC converter so that the capacitor energy storage cabinet recovers the energy transmitted via the DC bus according to the target power.

[0159] In some embodiments, the mode control module 74 is specifically used to: determine the remaining energy of the capacitor of the capacitor energy storage cabinet; in response to the remaining energy of the capacitor being less than a preset energy threshold, control the working state of the third bidirectional DC converter so that the battery group provides energy to the capacitor energy storage cabinet.

[0160] In some embodiments, the mode control module 74 is specifically used to: in response to the remaining energy of the capacitor being less than a preset pre-charge threshold, control the working state of the third bidirectional DC converter to enable the battery group to transfer energy to the capacitor energy storage cabinet until the remaining energy of the capacitor of the capacitor energy storage cabinet is greater than the preset pre-charge threshold, and the preset pre-charge threshold is less than the preset energy threshold.

[0161] In some embodiments, the energy control mode includes a traction energy release mode, and the battery group determination module 72 is specifically used to: respond to the traction energy release mode to determine the remaining battery energy of each of the battery modules; and screen out the battery modules whose remaining battery energy is greater than a preset allowable discharge value to form a battery group from among the remaining battery energies of all the battery modules.

[0162] In some embodiments, the mode control module 74 is specifically used to: calculate the sum of the capacitor power and the total battery power to obtain the total discharge power; in response to the target power being greater than the total discharge power, control the working state of the first bidirectional DC converter so that the capacitor energy storage cabinet releases energy to the DC bus according to the capacitor power, and control the working state of the second bidirectional DC converter so that the battery group releases energy to the DC bus according to the total battery power; or, in response to the target power being less than or equal to the total discharge power, control one or two or three of the first bidirectional DC converter, the second bidirectional DC converter, and the third bidirectional DC converter to perform energy release operations based on the target power and the capacitor power.

[0163] In some embodiments, the energy control mode includes an energy scheduling mode, and the mode control module 74 is specifically used to: determine the capacitor scheduling power of the capacitor energy storage cabinet and the battery scheduling power of the battery group, the capacitor scheduling power is the maximum power that the capacitor energy storage cabinet can output, and the battery scheduling power is the maximum power that the battery group can output; control the working state of the first bidirectional DC converter so that the capacitor energy storage cabinet releases energy to the DC bus according to the capacitor scheduling power; control the working state of the second bidirectional DC converter so that the battery group releases energy according to the battery scheduling power.

[0164] It should be noted that the energy control device of the rail vehicle can execute the energy control method of the rail vehicle provided in the embodiment of the present application, and has the functional modules and beneficial effects corresponding to the execution method. For technical details not fully described in the embodiment of the energy control device of the rail vehicle, please refer to the energy control method of the rail vehicle provided in the embodiment of the present application.

[0165] See also Figure 8 , Figure 8 A schematic diagram of the structure of a controller provided in an embodiment of the present application. The controller 800 includes one or more processors 81 and a memory 82. The memory 82 is connected to the one or more processors 81, for example, connected to the processor 81 via a bus.

[0166] The processor 81 is configured to support the controller to perform the corresponding functions in the method in the above method embodiment. The processor can be a central processing unit (CPU), a network processor (NP), a hardware chip or any combination thereof. The above hardware chip can be an application specific integrated circuit (ASIC), a programmable logic device (PLD) or a combination thereof. The above PLD can be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a generic array logic (GAL) or any combination thereof.

[0167] The memory 82 is used to store program codes, etc. The memory may include a volatile memory (VM), such as a random access memory (RAM); the memory may also include a non-volatile memory (NVM), such as a read-only memory (ROM), a flash memory, a hard disk drive (HDD) or a solid-state drive (SSD); the memory may also include a combination of the above types of memory.

[0168] The memory 82 may be used to store non-volatile software programs, non-volatile computer executable programs and modules, such as program instructions / modules corresponding to the energy control method for a rail vehicle in the embodiment of the present application. The processor executes the energy control method for a rail vehicle and various functional applications and data processing of the energy control device for a rail vehicle by running the non-volatile software programs, instructions and modules stored in the memory, that is, to realize the functions of the energy control method for a rail vehicle and the various modules or units of the energy control device for a rail vehicle provided in the above method embodiment.

[0169] The memory may include a program storage area and a data storage area, wherein the program storage area may store an operating system and an application required for at least one function. The data storage area may store data created according to the use of the energy control device of the rail vehicle, etc. In some embodiments, the memory may optionally include a memory remotely arranged relative to the processor, and these remote memories may be connected to the energy control device of the rail vehicle via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0170] The one or more modules are stored in the memory, and when executed by the one or more processors, the energy control method for the rail vehicle in any of the above-mentioned method embodiments is executed, for example, the method steps described in the above-mentioned method embodiments are executed to realize the functions of the modules described in the above-mentioned device embodiments.

[0171] An embodiment of the present application further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, wherein the computer program includes program instructions, and when the program instructions are executed by a controller, the controller executes the method described in the above embodiment.

[0172] A person skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium, and when the program is executed, it can include the processes of the embodiments of the above-mentioned methods. The storage medium can be a disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM), etc.

[0173] The above disclosure is only the preferred embodiment of the present application, which certainly cannot be used to limit the scope of rights of the present application. Therefore, equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. An energy control method for a rail vehicle, applied to an energy control system, characterized in that: The energy control system includes a first bidirectional DC converter, a capacitor energy storage cabinet, a second bidirectional DC converter, a battery energy storage cabinet, a third bidirectional DC converter and a controller. The first bidirectional DC converter and the second bidirectional DC converter are both configured to be electrically connected to a DC bus. The capacitor energy storage cabinet is electrically connected to the first bidirectional DC converter, the battery energy storage cabinet is electrically connected to the second bidirectional DC converter, and the third bidirectional DC converter is electrically connected between the capacitor energy storage cabinet and the battery energy storage cabinet. The controller is electrically connected to the first bidirectional DC converter, the capacitor energy storage cabinet, the second bidirectional DC converter, the battery energy storage cabinet and the third bidirectional DC converter respectively. The battery energy storage cabinet includes a plurality of battery modules. The energy control method includes: In response to an energy control request, determining an energy control mode, wherein the energy control request is used to request the energy control system to process a target power; In response to the energy control mode, a battery group is determined, wherein the battery group includes a plurality of target battery modules, and the target battery modules are battery modules in the battery energy storage cabinet that match preset screening conditions; Obtaining the capacitor power of the capacitor energy storage cabinet and the total battery power of the battery group; Based on the target power, the capacitor power and the total battery power, one, two or three of the first bidirectional DC converter, the second bidirectional DC converter and the third bidirectional DC converter are controlled to perform operations matching the energy control mode.

2. The energy control method according to claim 1, characterized in that: The energy control mode includes a braking energy recovery mode, and the determining of the battery group in response to the energy control mode includes: In response to the braking energy recovery mode, determining the remaining battery energy of each of the battery modules; Arrange the remaining energy of the batteries of all the battery modules in order from small to large; In order from small to large, the first battery module whose remaining battery energy is greater than or equal to the preset warning value is traversed as the first-end battery module; Accumulating the remaining energy of the head-end battery module and the batteries arranged in the head-end battery module in order from small to large, to obtain the energy accumulation value of each accumulation operation; In response to the energy accumulation value being greater than or equal to the preset power supply value, determining that the battery module for this accumulation operation is a terminal battery module, the head-end battery module, the terminal battery module and the battery module located between the head-end battery module and the terminal battery module form a power supply group, and the battery modules of the power supply group are used to provide power to the load; Eliminating the battery modules of the power supply group from all the battery modules to obtain the remaining plurality of battery modules; A battery group is determined based on the remaining plurality of battery modules.

3. The energy control method according to claim 2, characterized in that: The operation of controlling one, two or three of the first bidirectional DC converter, the second bidirectional DC converter and the third bidirectional DC converter to match the energy control mode based on the target power, the capacitor power and the total battery power includes: Calculating the sum of the capacitor power and the total battery power to obtain a total charging power; In response to the target power being greater than the total charging power, controlling the working state of the first bidirectional DC converter so that the capacitor energy storage cabinet recovers energy transmitted via the DC bus according to the capacitor power, and controlling the working state of the second bidirectional DC converter so that the battery group recovers energy transmitted via the DC bus according to the total battery power; or, In response to the target power being less than or equal to the total charging power, one, two, or three of the first bidirectional DC converter, the second bidirectional DC converter, and the third bidirectional DC converter are controlled to perform energy recovery operations based on the target power and the capacitor power.

4. The energy control method according to claim 3, characterized in that: The controlling one, two or three of the first bidirectional DC converter, the second bidirectional DC converter and the third bidirectional DC converter to perform an energy recovery operation based on the target power and the capacitor power includes: In response to the target power being greater than the capacitor power, controlling the working state of the first bidirectional DC converter so that the capacitor energy storage cabinet recovers energy transmitted via the DC bus according to the capacitor power, and controlling the working state of the second bidirectional DC converter so that the battery group recovers energy transmitted via the DC bus according to the difference between the target power and the capacitor power; or, In response to the target power being less than or equal to the capacitor power, the working state of the second bidirectional DC converter is controlled so that the capacitor energy storage cabinet recovers energy transmitted via the DC bus according to the target power.

5. The energy control method according to claim 4, characterized in that: After responding that the target power is less than the capacitor power, the method further includes: Determining the remaining energy of the capacitor of the capacitor energy storage cabinet; In response to the remaining energy of the capacitor being less than a preset energy threshold, the working state of the third bidirectional DC converter is controlled to enable the battery group to provide energy to the capacitor energy storage cabinet.

6. The energy control method according to claim 5, characterized in that: Before the capacitor energy storage cabinet and the battery group recover the energy transmitted via the DC bus, the method further includes: In response to the remaining energy of the capacitor being less than a preset pre-charge threshold, the working state of the third bidirectional DC converter is controlled to enable the battery group to transfer energy to the capacitor energy storage cabinet until the remaining energy of the capacitor of the capacitor energy storage cabinet is greater than the preset pre-charge threshold, and the preset pre-charge threshold is less than the preset energy threshold.

7. The energy control method according to claim 1, characterized in that: The energy control mode includes a traction energy release mode, and in response to the energy control mode, determining the battery group includes: In response to the traction energy release mode, determining the remaining battery energy of each of the battery modules; Among the remaining battery energies of all the battery modules, the battery modules whose remaining battery energies are greater than a preset allowable discharge value are screened out to form a battery group.

8. The energy control method according to claim 7, characterized in that: The operation of controlling one, two or three of the first bidirectional DC converter, the second bidirectional DC converter and the third bidirectional DC converter to match the energy control mode based on the target power, the capacitor power and the total battery power includes: Calculating the sum of the capacitor power and the total battery power to obtain a total discharge power; In response to the target power being greater than the total discharge power, controlling the working state of the first bidirectional DC converter so that the capacitor energy storage cabinet releases energy to the DC bus according to the capacitor power, and controlling the working state of the second bidirectional DC converter so that the battery group releases energy to the DC bus according to the total battery power; or, In response to the target power being less than or equal to the total discharge power, one, two, or three of the first bidirectional DC converter, the second bidirectional DC converter, and the third bidirectional DC converter are controlled to perform energy release operations based on the target power and the capacitor power.

9. The energy control method according to claim 7, characterized in that: The energy control mode includes an energy scheduling mode, and the operations of controlling one, two, or three of the first bidirectional DC converter, the second bidirectional DC converter, and the third bidirectional DC converter to perform matching operations of the energy control mode based on the target power, the capacitor power, and the total battery power include: Determine the capacitor scheduling power of the capacitor energy storage cabinet and the battery scheduling power of the battery group, the capacitor scheduling power is the maximum power that the capacitor energy storage cabinet can output, and the battery scheduling power is the maximum power that the battery group can output; Controlling the working state of the first bidirectional DC converter so that the capacitor energy storage cabinet releases energy to the DC bus according to the capacitor scheduling power; The working state of the second bidirectional DC converter is controlled so that the battery group releases energy according to the battery scheduling power.

10. An energy control system, characterized in that: The invention comprises a first bidirectional DC converter, a capacitor energy storage cabinet, a second bidirectional DC converter, a battery energy storage cabinet, a third bidirectional DC converter and a controller, wherein the first bidirectional DC converter and the second bidirectional DC converter are both configured to be electrically connected to a DC bus, the capacitor energy storage cabinet is electrically connected to the first bidirectional DC converter, the battery energy storage cabinet is electrically connected to the second bidirectional DC converter, the third bidirectional DC converter is electrically connected between the capacitor energy storage cabinet and the battery energy storage cabinet, the controller is electrically connected to the first bidirectional DC converter, the capacitor energy storage cabinet, the second bidirectional DC converter, the battery energy storage cabinet and the third bidirectional DC converter respectively, the battery energy storage cabinet comprises a plurality of battery modules, and the controller is configured to execute the energy control method for a rail vehicle according to any one of claims 1 to 9.

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