A control method and control circuit for train power supply

Abstract

The present application relates to a control method and control circuit for train power supply, the method comprising: when a train's energy storage power supply is connected in parallel for power supply, obtaining a first voltage difference between the energy storage power supplies of two adjacent vehicles of the train, determining whether the first voltage difference is less than a preset voltage difference, and if so, controlling a first contactor disposed between the two adjacent vehicles of the train to be in a closed state; if not, issuing a first instruction, the first instruction being used to control the traction power distribution of the energy storage power supplies between the vehicles of the train, so that a second voltage difference between the energy storage power supplies of the two adjacent vehicles after control by the first instruction is less than a preset voltage difference, and before the bus voltage difference is connected to the grid, controlling the vehicle in the current section to first perform power distribution and supply power separately, thereby achieving voltage regulation between the two adjacent vehicles, which can reduce the impact of the energy storage power supply voltage difference connection on the vehicle's traction power limitation during the process of connecting the energy storage power supply voltage difference to the grid, thereby reducing the impact of the energy storage power supply voltage difference connection on the entire vehicle operation.

Description

Technical Field

[0001] The present application belongs to the field of transportation technology, and in particular relates to a control method and a control circuit for power supply to a train. Background Art

[0002] At present, in order to improve the reliability of distributed energy storage trains, the energy storage power supply in the train is generally powered by parallel power supply.

[0003] However, in the prior art, when parallel power supply is used, the voltage difference between the various energy storage power sources needs to be considered. The contactor between the high-voltage energy storage power source and the grid is closed first, and then the contactor between the low-voltage energy storage power source and the grid is closed. Since only some of the energy storage power sources can be put into operation during the process of grid connection due to the voltage difference of the energy storage power sources, the vehicle's traction power will be limited during the period of grid connection.

[0004] Therefore, how to reduce the impact of the voltage difference of energy storage power supply on the vehicle's traction power limitation during the grid connection process is a technical problem that needs to be solved urgently. Summary of the Invention

[0005] The purpose of this application is to provide a train power supply control method; the train power supply control method provided by this application realizes voltage regulation between two adjacent vehicles by controlling the power distribution and separate power supply of the vehicle before the bus voltage difference is connected to the grid, which can reduce the impact of the energy storage power supply voltage difference connection on the vehicle's traction power limitation during the process of grid connection, thereby reducing the impact of the energy storage power supply voltage difference connection on the operation of the entire vehicle.

[0006] The technical solutions provided in this application are as follows:

[0007] A train power supply control method is applied to a train power supply control circuit, wherein the train power supply control circuit includes a first contactor disposed between two adjacent vehicles of the train, and the method includes:

[0008] When the energy storage power supplies of the train are connected in parallel for power supply, obtaining a first voltage difference between the energy storage power supplies of two adjacent vehicles of the train;

[0009] Determine whether the first voltage difference is less than a preset voltage difference. If so, control the first contactor to be in a closed state; if not, issue a first instruction, wherein the first instruction is used to control the traction power distribution of the energy storage power supply between the vehicles of the train, so that the second voltage difference of the energy storage power supply between the two adjacent vehicles after control by the first instruction is less than the preset voltage difference.

[0010] Preferably, the method further comprises:

[0011] When the discharge power of the energy storage power supply of any vehicle section of the train is lower than the preset discharge power, the first contactor between the any vehicle section and the adjacent vehicle is controlled to be in a disconnected state.

[0012] Preferably, the preset discharge power is one third of the average power of the train.

[0013] Preferably, the control circuit further includes a second contactor provided between the energy storage power supply and the power grid, and before obtaining the first voltage difference of the energy storage power supply between two adjacent vehicles of the train, further includes:

[0014] The second contactor is controlled to be in a closed state.

[0015] Preferably, the control circuit further includes a third contactor provided between the charging port and the power grid, and the method further includes:

[0016] When the energy storage power supply of the train needs to be charged, controlling any one of the first contactors to be in an off state, so that the control circuit is separated into a first control circuit and a second control circuit that are not connected to each other;

[0017] Controlling the charging interface of the first control circuit and the charging interface of the second control circuit to be connected to an external power source respectively;

[0018] controlling the third contactor to be in a closed state;

[0019] When the voltage value of the energy storage power supply in the first control circuit and the second control circuit reaches a threshold voltage, the third contactor is controlled to be in an off state.

[0020] The present application also provides a train power supply control circuit, comprising a controller and a first contactor provided between two adjacent vehicles of the train;

[0021] The controller is configured to obtain a first voltage difference between the energy storage power supplies of two adjacent vehicles of the train when the energy storage power supplies of the train are connected in parallel for power supply;

[0022] The controller is further configured to determine whether the first voltage difference is less than a preset voltage difference, and if so, to control the first contactor to be in a closed state; if not, to issue a first instruction, wherein the first instruction is configured to control the traction power distribution of the energy storage power supply between the vehicles of the train, so that the second voltage difference of the energy storage power supply between two adjacent vehicles controlled by the first instruction is less than the preset voltage difference.

[0023] Preferably,

[0024] The controller is further configured to control the first contactor between any vehicle section of the train and an adjacent vehicle to be in a disconnected state when the discharge power of the energy storage power supply of any vehicle section of the train is lower than a preset discharge power.

[0025] Preferably,

[0026] The control circuit further includes a second contactor disposed between the energy storage power supply and the power grid;

[0027] Before the controller executes the step of obtaining the first voltage difference of the energy storage power supply between two adjacent vehicles of the train, the controller is further configured to control the second contactor to be in a closed state.

[0028] Preferably,

[0029] The control circuit further includes a third contactor disposed between the charging port and the power grid;

[0030] The controller is further configured to control any one of the first contactors to be in an off state when it is necessary to charge the energy storage power supply of the train, so as to separate the control circuit into a first control circuit and a second control circuit that are not connected to each other;

[0031] The controller is further configured to control the charging interface of the first control circuit and the charging interface of the second control circuit to be connected to an external power source respectively;

[0032] The controller is further configured to control the third contactor to be in a closed state;

[0033] The controller is further configured to control the third contactor to be in an off state when the voltage value of the energy storage power supply in the first control circuit and the second control circuit reaches a threshold voltage.

[0034] The present application also provides a train, comprising the train power supply control circuit described in any one of the above items.

[0035] Compared with the prior art, the present application provides a train power supply control method, which is applied to a train power supply control circuit. The train power supply control circuit includes a first contactor arranged between two adjacent vehicles of the train. The method includes: when the train's energy storage power supply is powered in parallel, obtaining a first voltage difference between the energy storage power supplies of the two adjacent vehicles of the train; determining whether the first voltage difference is less than a preset voltage difference, and if so, controlling the first contactor to be in a closed state; if not, issuing a first instruction, the first instruction being used to control the traction power distribution of the energy storage power supply between the vehicles of the train, so that the second voltage difference of the energy storage power supply between the two adjacent vehicles after control by the first instruction is less than the preset voltage difference. Before the bus voltage difference is connected to the grid, the power distribution is controlled to be separately supplied to the vehicle in the current vehicle, thereby achieving voltage regulation between the two adjacent vehicles. This can reduce the impact of the energy storage power supply voltage difference connection on the vehicle's traction power limitation during the energy storage power supply voltage difference connection, thereby reducing the impact of the energy storage power supply voltage difference connection on the entire vehicle operation.

[0036] Compared with the existing technology, the control method provided by the present application can disconnect the vehicle's control circuit by controlling the first contactor to disconnect when the vehicle's energy storage power supply needs to be charged, dividing the control circuit into two independent circuits. By respectively controlling the charging interfaces of the two independent circuits to connect to the external power supply and controlling the third contactor to close, the energy storage power supplies in the two independent circuits can be charged in parallel, thereby improving the charging speed of the entire vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

[0038] Figure 1 A circuit diagram of a control circuit for powering a train in the prior art;

[0039] Figure 2 This is a flow chart of a train power supply control method disclosed in an embodiment of the present application;

[0040] Figure 3 This is a flow chart of another train power supply control method disclosed in an embodiment of the present application;

[0041] Figure 4 A circuit diagram of a train power supply control circuit disclosed in an embodiment of the present application;

[0042] Figure 5 A circuit diagram of another train power supply control circuit disclosed in an embodiment of the present application. DETAILED DESCRIPTION

[0043] In order to help those skilled in the art better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of this application.

[0044] It should be noted that when an element is referred to as being “fixed on” or “set on” another element, it can be directly on the other element or indirectly set on the other element; when an element is referred to as being “connected to” another element, it can be directly connected to the other element or indirectly connected to the other element.

[0045] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout the description of this application, "plurality" or "several" means two or more, unless otherwise specifically defined.

[0047] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the efficacy and purpose that can be achieved by this application.

[0048] like Figure 1As shown, due to the voltage difference between the various energy storage power supplies in the control circuit of the train power supply in the prior art, and the control circuit does not set a contactor between two adjacent vehicles to perform voltage regulation, the voltage difference between the various energy storage power supplies needs to be considered when supplying power in parallel. The contactor between the high-voltage energy storage power supply and the power grid is closed first, and then the contactor between the low-voltage energy storage power supply and the power grid is closed. Since only some of the energy storage power supplies can be put into operation during the process of grid connection due to the voltage difference of the energy storage power supplies, the traction power of the vehicle will be limited during the period of grid connection.

[0049] like Figure 2 As shown, an embodiment of the present application provides a train power supply control method, which is applied to a train power supply control circuit. The train power supply control circuit includes a first contactor provided between two adjacent vehicles of the train. The method includes:

[0050] S101: When energy storage power supplies of a train are connected in parallel for power supply, obtaining a first voltage difference between the energy storage power supplies of two adjacent vehicles of the train;

[0051] In this embodiment, the train generally includes the head vehicle (Mcp1 vehicle), the tail vehicle (Mcp2 vehicle) and N vehicles (T vehicle or M vehicle) located between the head vehicle and the tail vehicle, among which, Mcp vehicle: the vehicle is powered, with a driver's cab and a pantograph; T vehicle: the vehicle is a trailer; M vehicle: the vehicle is powered; N is a positive integer greater than or equal to 1.

[0052] In this embodiment, a train with three vehicles is taken as an example (i.e., N is 1). When the energy storage power supplies of the train are connected in parallel for power supply, a first voltage difference ΔU of the energy storage power supplies between two adjacent vehicles of the train is obtained. ΔU includes ΔU1 and ΔU2. ΔU1 is the voltage difference between the voltage of energy storage power supply 1 of vehicle Mcp1 and the voltage of energy storage power supply 2 of vehicle T or vehicle M. ΔU2 is the voltage difference between the voltage of energy storage power supply 2 of vehicle T or vehicle M and the voltage of energy storage power supply 3 of vehicle Mcp2.

[0053] S102. Determine whether the first voltage difference is less than a preset voltage difference. If so, control the first contactor to be in a closed state; if not, issue a first instruction, which is used to control the traction power distribution of the energy storage power supply between the vehicles of the train, so that the second voltage difference of the energy storage power supply between the two adjacent vehicles controlled by the first instruction is less than the preset voltage difference.

[0054] In this embodiment, it is determined whether ΔU1 and ΔU2 in the first voltage difference ΔU are both less than a preset voltage difference Ux. If ΔU1 and ΔU2 are both less than Ux, the first contactor K11 provided between the Mcp1 vehicle and the T vehicle or the M vehicle and the contactor provided between the Mcp2 vehicle and the T vehicle or the M vehicle are controlled to be in a closed state. If not, that is, including the three situations of ΔU1 being greater than or equal to Ux and ΔU2 being greater than or equal to Ux, ΔU1 being greater than or equal to Ux and ΔU2 being less than Ux, and ΔU1 being less than Ux and ΔU2 being greater than or equal to Ux, a first instruction is issued, and the first instruction is used to control the energy storage power supply 1 of the Mcp1 vehicle, the energy storage power supply 2 of the T vehicle or the M vehicle, and the energy storage power supply 2 of the Mcp2 vehicle. The traction power is distributed among the energy storage power supplies of the three vehicles in total by power supply 3 so that the second voltage difference after control by the first instruction is less than the preset voltage difference Ux, wherein the second voltage difference includes the voltage difference between the energy storage power supply 1 of the Mcp1 vehicle and the energy storage power supply 2 between the T vehicle or the M vehicle, and the voltage difference between the energy storage power supply 2 between the T vehicle or the M vehicle and the energy storage power supply 3 of the Mcp2 vehicle, that is, after control by the first instruction, the voltage difference between the energy storage power supply 1 of the Mcp1 vehicle and the energy storage power supply 2 between the T vehicle or the M vehicle is less than Ux, and the voltage difference between the energy storage power supply 2 between the T vehicle or the M vehicle and the energy storage power supply 3 of the Mcp2 vehicle is also less than Ux, and then the first contactor K11 is controlled to be in a closed state.

[0055] For example, the voltage of the energy storage power supply 1 of the Mcp1 vehicle is U1, the voltage of the energy storage power supply 2 of the T vehicle or the M vehicle is U2, and the voltage of the energy storage power supply 3 of the Mcp2 vehicle is U3, and U1>U2>U3. The voltage difference ΔU1 between the voltage U1 of the energy storage power supply 1 of the Mcp1 vehicle and the voltage U2 of the energy storage power supply 2 of the T vehicle or the M vehicle is U1-U2, and the voltage difference ΔU2 between the voltage U2 of the energy storage power supply 2 of the T vehicle or the M vehicle and the voltage U3 of the energy storage power supply 3 of the Mcp2 vehicle is U2-U3. The power distribution that needs to be allocated to each vehicle, including the traction system and other loads, is P1, P2, and P3 according to the voltage of the energy storage power supply of each vehicle. The average power distributed to each vehicle by the train is Pj. The traction power of each vehicle is distributed using the following formula:

[0056] Pj=(P1+P2+P3) / 3

[0057]

[0058] P2=Pj

[0059]

[0060]

[0061] Where k is the coefficient, t is the running time, and i is the time constant.

[0062] After determining the power distribution required for each car, the output power of the Mcp1 car's energy storage power source to the traction system and other loads is increased, while the output power of the Mcp2 car's energy storage power source to the traction system and other loads is reduced. This results in higher power consumption from the higher-voltage energy storage power source 1 and lower power consumption from the lower-voltage energy storage power source 3. This achieves voltage regulation between adjacent cars, ensuring that the voltage difference between the Mcp1 car's energy storage power source 1 and the T or M car's energy storage power source 2 is less than Ux, and that the voltage difference between the T or M car's energy storage power source 2 and the Mcp2 car's energy storage power source 3 is also less than Ux. The control principle for achieving voltage regulation through power distribution is the same for trains with four or more cars, and will not be further elaborated here.

[0063] Compared with the prior art, the present application provides a train power supply control method, which is applied to a train power supply control circuit. The train power supply control circuit includes a first contactor arranged between two adjacent vehicles of the train. The method includes: when the train's energy storage power supply is powered in parallel, obtaining a first voltage difference between the energy storage power supplies of the two adjacent vehicles of the train; determining whether the first voltage difference is less than a preset voltage difference, and if so, controlling the first contactor to be in a closed state; if not, issuing a first instruction, the first instruction being used to control the traction power distribution of the energy storage power supply between the vehicles of the train, so that the second voltage difference of the energy storage power supply between the two adjacent vehicles after control by the first instruction is less than the preset voltage difference. Before the bus voltage difference is connected to the grid, the power distribution is controlled to be separately supplied to the vehicle in the current vehicle, thereby achieving voltage regulation between the two adjacent vehicles. This can reduce the impact of the energy storage power supply voltage difference connection on the vehicle's traction power limitation during the energy storage power supply voltage difference connection, thereby reducing the impact of the energy storage power supply voltage difference connection on the entire vehicle operation.

[0064] As an implementation manner, in the embodiment of the present application, the method further includes:

[0065] S201. When the discharge power of the energy storage power supply of any vehicle section of the train is lower than a preset discharge power, the first contactor between any vehicle section and an adjacent vehicle is controlled to be in a disconnected state.

[0066] In this embodiment, when the energy storage power supply of any train section experiences a limited discharge current, that is, when the discharge power is lower than the preset discharge power, the first contactor K11 between any train section and the adjacent train section is controlled to be in an off state, so that the line of the train section is disconnected from the busbar, and the energy storage power supply of the train section operates according to the limited power of the energy storage power supply. The energy storage power supplies of other train sections can continue to operate at normal power, thereby avoiding the impact of the energy storage discharge on the energy storage power supplies of other train sections, thereby minimizing the impact on the performance of the entire vehicle. The execution order of step S201 can be after step S102, before step S101, or between steps S101 and S102. Step S201 is executed when it is detected that the discharge power of the energy storage power supply of any train section is lower than the preset discharge power.

[0067] As an implementation method, in the embodiment of the present application, the preset discharge power is one third of the average power of the train.

[0068] In this embodiment, the condition for disconnecting the vehicle line from the busbar is that the discharge power of the energy storage power supply in this section has been reduced to less than 1 / 3 of the average power Pj of the entire vehicle.

[0069] As an implementation mode, in an embodiment of the present application, the control circuit further includes a second contactor arranged between the energy storage power supply and the power grid, and before obtaining the first voltage difference of the energy storage power supply between two adjacent vehicles of the train, it also includes: controlling the second contactor to be in a closed state.

[0070] In this embodiment, when the energy storage power supplies of the train are connected in parallel, the second contactor K21 between the energy storage power supplies of each car and the power grid is first controlled to be in a closed state, so that the energy storage power supplies and the power grid are connected, and then the fourth contactor K41 between the traction system and other loads and the power grid is controlled to be in a closed state, so that the energy storage power supplies can supply power to the control traction system and other loads through the power grid. Alternatively, the fourth contactor K41 between the traction system and other loads and the power grid can be controlled to be in a closed state first, and then the second contactor K21 between the energy storage power supplies of each car and the power grid can be controlled to be in a closed state, so that the energy storage power supplies can supply power to the control traction system and other loads through the power grid.

[0071] As an implementation manner, in the embodiment of the present application, the control circuit further includes a third contactor disposed between the charging port and the power grid, and the method further includes:

[0072] S301. When it is necessary to charge the energy storage power supply of the train, control any one of the first contactors to be in an off state, so that the control circuit is separated into a first control circuit and a second control circuit that are not connected to each other;

[0073] In this embodiment, taking a train with three vehicles as an example, when the energy storage power supply of the train needs to be charged, the contactor provided between the Mcp1 vehicle and the T vehicle or the M vehicle can be controlled to be in a disconnected state, or the contactor provided between the Mcp1 vehicle and the T vehicle or the M vehicle can be controlled to be in a disconnected state, so that the control circuit is separated into a first control circuit and a second control circuit that are not connected to each other.

[0074] S302: Control the charging interface of the first control circuit and the charging interface of the second control circuit to be connected to an external power source respectively;

[0075] S303, controlling the third contactor to be in a closed state;

[0076] In this embodiment, by separating the control circuit into a first control circuit and a second control circuit that are not connected to each other, and then controlling the charging interface of the first control circuit and the charging interface of the second control circuit to be connected to an external power supply respectively, and controlling the third contactor arranged between the charging interface and the power grid to be in a closed state, the charging interface 1 arranged at the head vehicle of the train and the charging interface 2 arranged at the tail vehicle of the train are respectively charged at the same time, so as to provide a charging rate for the train.

[0077] S304: When the voltage value of the energy storage power supply in the first control circuit and the second control circuit reaches a threshold voltage, control the third contactor to be in an open state.

[0078] In this embodiment, for example, the first contactor K11 between the Mcp1 vehicle and the T or M vehicle is disconnected, separating the control circuit into a first control circuit and a second control circuit that are not connected to each other. After the charging interface provided on the head vehicle and the charging interface provided on the rear vehicle of the train are connected to the external power supply, the third contactor is controlled to be in a closed state. Charging interface 1 charges the energy storage power supply 1 of the Mcp1 vehicle, and charging interface 2 charges the energy storage power supply 2 of the Mcp2 vehicle and the energy storage power supply 3 of the T or M vehicle. After the state of charge (SOC) of the energy storage power supply 1 of the Mcp1 vehicle reaches the maximum allowable state of charge (Smax) (i.e., the voltage reaches the threshold voltage), charging of the energy storage power supply 1 of the Mcp1 vehicle is restricted. At the same time, charging interface 1 limits the charging current (to less than 5A). When the state of charge (SOC) of the energy storage power supply 2 of the Mcp2 vehicle also reaches the maximum allowable state of charge (Smax) (i.e., the voltage reaches the threshold voltage), charging of the entire vehicle is stopped.

[0079] The execution order of steps S301 to S304 can be before step S101, after step S102, between steps S101 and S102, or after step S201 or after step S201. Steps S301 to S304 are executed when it is detected that the energy storage power supply of the train needs to be charged.

[0080] For the case where the execution order of steps S301 to S304 is after step S102, Figure 3 As shown, an embodiment of the present application provides another method for controlling train power supply, the method comprising:

[0081] S401: When the energy storage power supplies of the train are connected in parallel for power supply, controlling the second contactor to be in a closed state to obtain a first voltage difference between the energy storage power supplies of two adjacent vehicles of the train;

[0082] S402: Determine whether the first voltage difference is less than a preset voltage difference. If so, control the first contactor to be in a closed state. If not, issue a first instruction, the first instruction being used to control the traction power distribution of the energy storage power supply between the vehicles of the train so that the second voltage difference of the energy storage power supply between two adjacent vehicles controlled by the first instruction is less than the preset voltage difference.

[0083] S403: When the energy storage power supply of the train needs to be charged, control any one of the first contactors to be in an off state, so that the control circuit is separated into a first control circuit and a second control circuit that are not connected to each other;

[0084] S404: Control the charging interface of the first control circuit and the charging interface of the second control circuit to be connected to an external power source respectively;

[0085] S405, controlling the third contactor to be in a closed state;

[0086] S406: When the voltage value of the energy storage power supply in the first control circuit and the second control circuit reaches a threshold voltage, control the third contactor to be in an open state.

[0087] like Figure 4 and Figure 5As shown, an embodiment of the present application also provides a train power supply control circuit, including a controller and a first contactor K11 arranged between two adjacent vehicles of the train; the controller obtains a first voltage difference of the energy storage power supply between the two adjacent vehicles of the train when the energy storage power supply of the train is powered in parallel; the controller is further used to determine whether the first voltage difference is less than a preset voltage difference, and if so, control the first contactor K11 to be in a closed state; if not, issue a first instruction, the first instruction is used to control the traction power distribution of the energy storage power supply between the vehicles of the train, so that the second voltage difference of the energy storage power supply between the two adjacent vehicles after control by the first instruction is less than the preset voltage difference.

[0088] The controller is not shown in the drawings of this embodiment. Figure 4 Take a train with three vehicles as an example. The train includes the head vehicle (Mcp1), the tail vehicle (Mcp2), and a vehicle (T1 / M1) located between the head vehicle and the tail vehicle. Figure 5 Taking a train with four vehicles as an example, the train includes a head vehicle (Mcp1), a tail vehicle (Mcp2), and two vehicles located between the head vehicle and the tail vehicle (T1 / M1 and T2 / M2). K11 between T1 / M1 and T2 / M2 can be set at T1 / M1 or T2 / M2, where DC+ and DC- represent the power grid.

[0089] As an implementation mode, in an embodiment of the present application, the controller is also used to control the first contactor K11 between any vehicle section and the adjacent vehicle to be in a disconnected state when the discharge power of the energy storage power supply of any vehicle section of the train is lower than the preset discharge power.

[0090] like Figure 4 and Figure 5 As shown, as an implementation mode, in an embodiment of the present application, the control circuit further includes a second contactor K21 arranged between the energy storage power supply and the power grid; before the controller executes the acquisition of the first voltage difference of the energy storage power supply between two adjacent vehicles of the train, the controller is also used to control the second contactor K21 to be in a closed state.

[0091] like Figure 4 and Figure 5As shown, as an implementation manner, in the embodiment of the present application, the control circuit further includes a third contactor K31 arranged between the charging interface and the power grid; the controller is further used to control any one of the first contactors K11 to be in an off state when the energy storage power supply of the train needs to be charged, so that the control circuit is separated into a first control circuit and a second control circuit that are not connected to each other; the controller is further used to control the charging interface 1 of the first control circuit and the charging interface 2 of the second control circuit to be connected to an external power supply respectively; the controller is further used to control the third contactor K31 to be in a closed state; the controller is further used to control the third contactor K31 to be in an off state when the voltage value of the energy storage power supply in the first control circuit and the second control circuit reaches a threshold voltage.

[0092] like Figure 4 and Figure 5 As shown, the control circuit further includes a fourth contactor K41 provided between the traction system and other loads and the power grid. By controlling the closing or opening of the fourth contactor, the traction system and other loads and the power grid can be connected or disconnected.

[0093] An embodiment of the present application also provides a train, comprising any one of the above-mentioned train power supply control circuits.

[0094] It should be understood that the use of "system," "device," "unit," and / or "module" in this application is merely a method for distinguishing different components, elements, parts, portions, or assemblies at different levels. However, if other terms can achieve the same purpose, the terms may be replaced by other expressions.

[0095] The embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referenced to each other.

[0096] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present application. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A train power supply control method, characterized in that: A control circuit for powering a train, the control circuit comprising a first contactor disposed between two adjacent vehicles of the train, a second contactor disposed between an energy storage power source and a power grid, and a fourth contactor disposed between a traction system and other loads and the power grid, the method comprising: When the energy storage power supplies of the train are connected in parallel for power supply, controlling the second contactor and the fourth contactor to be in a closed state, and obtaining a first voltage difference between the energy storage power supplies of two adjacent vehicles of the train; Determine whether the first voltage difference is less than a preset voltage difference. If so, control the first contactor to be in a closed state; if not, issue a first instruction, wherein the first instruction is used to control the traction power distribution of the energy storage power supplies between the vehicles of the train, so that the energy storage power supply with a higher voltage outputs more power to the traction system and other loads, and the energy storage power supply with a lower voltage outputs less power to the traction system and other loads, so that the second voltage difference of the energy storage power supplies between the two adjacent vehicles after control by the first instruction is less than the preset voltage difference, and control the first contactor to be in a closed state.

2. The train power supply control method according to claim 1, characterized in that: The method further comprises: When the discharge power of the energy storage power supply of any vehicle section of the train is lower than the preset discharge power, the first contactor between the any vehicle section and the adjacent vehicle is controlled to be in a disconnected state.

3. The train power supply control method according to claim 2, characterized in that: The preset discharge power is one third of the average power of the train.

4. The train power supply control method according to claim 1, characterized in that: The control circuit further includes a third contactor disposed between the charging port and the power grid, and the method further includes: When the energy storage power supply of the train needs to be charged, controlling any one of the first contactors to be in an off state, so that the control circuit is separated into a first control circuit and a second control circuit that are not connected to each other; Controlling the charging interface of the first control circuit and the charging interface of the second control circuit to be connected to an external power source respectively; controlling the third contactor to be in a closed state; When the voltage value of the energy storage power supply in the first control circuit and the second control circuit reaches a threshold voltage, the third contactor is controlled to be in an off state.

5. A train power supply control circuit, characterized in that: It includes a controller and a first contactor provided between two adjacent vehicles of the train, a second contactor provided between an energy storage power source and a power grid, and a fourth contactor provided between a traction system and other loads and the power grid; The controller controls the second contactor and the fourth contactor to be in a closed state when the energy storage power supplies of the train are connected in parallel to supply power, and obtains a first voltage difference between the energy storage power supplies of two adjacent vehicles of the train; The controller is further configured to determine whether the first voltage difference is less than a preset voltage difference, and if so, to control the first contactor to be in a closed state; if not, to issue a first instruction, wherein the first instruction is configured to control the traction power distribution of the energy storage power supplies between the vehicles of the train, so that the energy storage power supplies with a higher voltage output more power to the traction system and other loads, and the energy storage power supplies with a lower voltage output less power to the traction system and other loads, so that the second voltage difference of the energy storage power supplies between two adjacent vehicles after control by the first instruction is less than the preset voltage difference, and the first contactor is controlled to be in a closed state.

6. The train power supply control circuit according to claim 5, characterized in that: The controller is further configured to control the first contactor between any vehicle section of the train and an adjacent vehicle to be in a disconnected state when the discharge power of the energy storage power supply of any vehicle section of the train is lower than a preset discharge power.

7. The train power supply control circuit according to claim 5, characterized in that: The control circuit further includes a third contactor disposed between the charging port and the power grid; The controller is further configured to control any one of the first contactors to be in an off state when it is necessary to charge the energy storage power supply of the train, so as to separate the control circuit into a first control circuit and a second control circuit that are not connected to each other; The controller is further configured to control the charging interface of the first control circuit and the charging interface of the second control circuit to be connected to an external power source respectively; The controller is further configured to control the third contactor to be in a closed state; The controller is further configured to control the third contactor to be in an off state when the voltage value of the energy storage power supply in the first control circuit and the second control circuit reaches a threshold voltage.

8. A train, characterized in that: A train power supply control circuit comprising the control circuit described in any one of claims 5-7.

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