A power control method and device

Abstract

Embodiments of the present application disclose a power control method and device, which obtain the real-time speed and running resistance of a train at a first moment, determine the required output power for the train to maintain the real-time speed according to the real-time speed and running resistance, and determine the number of power units that can be shut down of the train's power unit based on the required output power and the maximum output power of the train at the first moment. The power unit can be an axle, a bogie or a motor car. In this way, the operation of the train can be controlled according to the number of power units that can be shut down. Since the number of power units that can be shut down is determined according to the real-time working condition of the train, the number is targeted at the real-time working condition. After shutting down the corresponding power units according to the number of power units that can be shut down, the remaining power units can operate with higher efficiency. In this way, by intelligently distributing the power of the traction drive system, the efficiency of the train's power system is maximized, thereby achieving the effect of reducing energy consumption.

Description

Technical Field

[0001] The present invention relates to the field of rail trains, and particularly to a power control method and device. Background Art

[0002] To effectively reduce the energy consumption of multiple unit trains, it is necessary to first achieve refined energy management of multiple unit trains, and then study the energy chain management technology of multiple unit trains. Taking the CR450 multiple unit train as an example, the key technologies for reducing energy consumption costs are reflected in: the energy consumption of multiple unit trains mainly includes the energy consumption of the traction system, the energy consumption of the auxiliary system, and the energy consumption of the comfort system. Among them, the traction energy consumption accounts for a huge proportion. The traditional energy-saving practices only start from the perspective of line operation and energy-saving operation of the train, without examining the train traction drive system itself, regarding the efficiency of the train traction drive system as a constant, losing its characteristics that change with working conditions, and not optimizing its utilization. Therefore, the efficiency of the train traction drive system cannot be effectively improved. Summary of the Invention

[0003] To solve the above technical problems, the embodiments of the present application provide a power control method and device, which can effectively improve the efficiency of the train traction drive system.

[0004] The embodiments of the present application provide a power control method, including:

[0005] Obtaining the real-time speed and running resistance of the train at a first moment;

[0006] Determining the required output power for the train to maintain the real-time speed according to the real-time speed and the running resistance;

[0007] Based on the required output power and the maximum output power of the train at the first moment, determining the number of power units of the train that can be shut down; the power unit is an axle unit, a bogie unit or a multiple unit unit;

[0008] Controlling the operation of the train according to the number of power units of the train that can be shut down.

[0009] Optionally, the determining the number of power units of the train that can be shut down based on the required output power and the maximum output power of the train at the first moment includes:

[0010] Determining the power that can be removed based on the required output power and the maximum output power of the train at the first moment;

[0011] Determining the rated power of the power unit according to the number of traction motors included in the power unit and the rated power of the traction motor;

[0012] Determining the number of power units of the train that can be shut down according to the power that can be removed and the rated power of the power unit.

[0013] Optionally, the number of closable power units of the train is calculated by the following formula:

[0014]

[0015] wherein, the N unit_cut is the number of closable power units, the P total is the maximum output power of the train at the first moment, the P need is the required output power, the N unit is the number of traction motors included in the power unit, the P IM is the rated power of the traction motor, and [] is the floor function symbol.

[0016] Optionally, when the power unit is an axle unit, each power unit includes one traction motor; when the power unit is a bogie unit, each power unit includes two traction motors; when the power unit is a motor car unit, each power unit includes four traction motors.

[0017] Optionally, controlling the operation of the train according to the number of closable power units includes:

[0018] Sending the number of closable power units of the train to the central control unit of the train, so as to control the operation of the train by using the central control unit.

[0019] The embodiment of the present application further provides a power control device, including:

[0020] An operating condition acquisition unit, configured to acquire the real-time speed and running resistance of the train at the first moment;

[0021] A required power determination unit, configured to determine the required output power for the train to maintain the real-time speed according to the real-time speed and the running resistance;

[0022] A closable quantity determination unit, configured to determine the number of closable power units of the train based on the required output power and the maximum output power of the train at the first moment; the power unit is an axle unit, a bogie unit or a motor car unit;

[0023] An operation control unit, configured to control the operation of the train according to the number of closable power units.

[0024] Optionally, the closable quantity determination unit includes:

[0025] A power removal determination unit for determining the removable power based on the required output power and the maximum output power of the train at the first moment;

[0026] A rated power calculation unit for determining the rated power of the power unit according to the number of traction motors included in the power unit and the rated power of the traction motors;

[0027] A closable quantity determination subunit for determining the closable quantity of the power unit according to the removable power and the rated power of the power unit.

[0028] Optionally, the closable quantity of the power unit of the train is calculated by the following formula:

[0029]

[0030] wherein, the N unit_cut is the closable quantity of the power unit, the P total is the maximum output power of the train at the first moment, the P need is the required output power, the N unit is the number of traction motors included in the power unit, the P IM is the rated power of the traction motor, and [] is the floor function symbol.

[0031] Optionally, when the power unit is an axle drive unit, each power unit includes one traction motor; when the power unit is a bogie unit, each power unit includes two traction motors; when the power unit is a motor car unit, each power unit includes four traction motors.

[0032] Optionally, the operation control unit is specifically configured to:

[0033] Send the closable quantity of the power unit to the central control unit of the train to control the operation of the train by using the central control unit.

[0034] The embodiments of the present application provide a power control method and device, which obtain the real-time speed and running resistance of a train at a first moment, determine the required output power for the train to maintain the real-time speed according to the real-time speed and running resistance, and determine the number of power units that can be shut down of the train's power unit based on the required output power and the maximum output power of the train at the first moment. The power unit can be a driving axle, a bogie or a motor car. In this way, the operation of the train can be controlled according to the number of power units that can be shut down. Since the number of power units that can be shut down is determined according to the real-time working condition of the train, this number is for the real-time working condition. After shutting down the corresponding power units according to the number of power units that can be shut down, the remaining power units can operate with higher efficiency. In this way, by intelligently distributing the power of the traction drive system, the efficiency of the train power system is maximized, thereby achieving the effect of reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0036] Figure 1 It is a flowchart of a power control method provided by an embodiment of the present application;

[0037] Figure 2 It is a schematic structural diagram of a power control system provided by an embodiment of the present application;

[0038] Figure 3 It is a structural block diagram of a power control device provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] In order to enable those skilled in the art to better understand the solutions of the present application, the following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0040] As described in the background art, in the energy consumption of motor cars, traction energy consumption accounts for a huge proportion. In traditional energy-saving practices, the efficiency of the train's traction drive system is regarded as a constant, losing its characteristics that change with the working condition and not optimizing its utilization. Therefore, the efficiency of the train's traction drive system cannot be effectively improved.

[0041] The inventor found through research that the average efficiency of the train traction power system is about 85%. In addition to being affected by its own electrical properties and mechanical structure, it is also affected by working conditions, such as being affected by instantaneous load and instantaneous speed. It is not a constant value, but a series of curve clusters, presenting a three-dimensional distribution in the "load - speed" space. If the power control is carried out according to the real-time working conditions to improve the efficiency of the train traction power system, it is an important issue.

[0042] Based on this, the embodiments of the present application provide a power control method and device. The real-time speed and running resistance of the train at the first moment are obtained. According to the real-time speed and running resistance, the required output power for the train to maintain this real-time speed is determined. Based on the required output power and the maximum output power of the train at the first moment, the number of closable power units of the train is determined. The power unit can be a driving axle, a bogie or a motor car. In this way, the operation of the train can be controlled according to the number of closable power units. Since the number of closable power units is determined according to the real-time working conditions of the train, this number is targeted at the real-time working conditions. After closing the corresponding power units according to the number of closable power units, the remaining power units can exert higher efficiency. In this way, by intelligently distributing the power of the traction drive system, the efficiency of the train power system is maximized, thereby achieving the effect of reducing energy consumption.

[0043] The following will, in conjunction with the accompanying drawings, through embodiments, elaborate in detail on the specific implementation manners of a power method and device provided by the embodiments of the present application.

[0044] Reference Figure 1 As shown, it is a flowchart of a power control method provided by the embodiments of the present application. This method can be applied to a vehicle controller and may include the following steps.

[0045] S101, obtain the real-time speed and running resistance of the train at the first moment.

[0046] In the embodiments of the present application, the real-time working conditions of the train can be obtained, and the power distribution of the train can be controlled according to the real-time working conditions to maximize the efficiency of the train power system, thereby achieving the effect of reducing energy consumption. The real-time working conditions can include the real-time speed and running resistance. The running resistance is related to the road conditions. For example, the running resistance is large when going uphill and small when going downhill. Of course, the real-time working conditions can also include the real-time load. Specifically, the real-time speed and running resistance of the train at the first moment can be obtained. In addition, the real-time load of the train at the first moment can also be obtained.

[0047] S102, according to the real-time speed and the running resistance, determine the required output power for the train to maintain the real-time speed.

[0048] In the embodiments of the present application, according to the real-time speed and running resistance, the required output power for the train to maintain the real-time speed can be determined. The required output power is the minimum value of the output power of the train power system. The output power of the train power system must be greater than the required output power to enable the normal operation of the train. The required output power of the train is positively correlated with both the real-time speed and the running resistance, that is, the greater the real-time speed and the running resistance, the greater the required output power. There may be a corresponding relationship between the required output power of the train and the working conditions of the train, and then the required output power of the train can be determined according to this corresponding relationship and the working conditions of the train at the first moment.

[0049] S103. Based on the required output power and the maximum available output power of the train at the first moment, determine the number of power units of the train that can be shut down.

[0050] In the embodiments of the present application, the maximum available output power of the train at the first moment can be determined. The maximum available output power of the train at the first moment is usually greater than or equal to the required output power of the train, so that the power unit does not operate at full load and has more variability. Specifically, the maximum available output power of the train at the first moment is the rated power of the whole train, which can be determined according to the working conditions of the train at the first moment. There may be a corresponding relationship between the maximum available output power of the train and the working conditions, and then the maximum available output power of the train at the first moment can be determined according to this corresponding relationship and the working conditions at the first moment.

[0051] Among them, the power unit can be subdivided into an axle unit, a bogie unit, and a motor car unit, so the power unit is an axle unit, a bogie unit, or a motor car unit. The power control modes are divided into three modes, namely the axle control mode, the bogie control mode, and the car control mode. In the axle control mode, the minimum power unit that can be controlled each time is an axle unit, including one traction motor. In the bogie control mode, the minimum power unit that can be controlled each time is a bogie unit, including two axle units, that is, two traction motors. In the car control mode, the minimum power unit that can be controlled each time is a motor car unit, including two bogies, that is, four axle units, that is, four traction motors.

[0052] In the train power system, since the traction transformer, rectifier, and inverter have relatively high efficiency and the model construction is relatively complex, focusing on the efficiency of the traction motor under different conditions, it can be known that when the train running speed is low or the traction power of the train is low, the efficiency of the traction motor is low, while when the train running speed is high and the traction power of the train is large, the efficiency of the traction motor is high. This indicates that the working efficiency of the traction motor with a larger load is greater than that of the traction motor with a smaller load. Therefore, by reasonably distributing the train running power, some motors can be in a large-load working state, and at the same time, some motors that do not need to work can be removed, so that the overall efficiency of the traction motors of the whole train becomes higher, thus achieving the purpose of energy conservation.

[0053] Therefore, based on the required output power and the maximum output power of the train at the first moment, the number of power units that can be turned off of the train can be determined. Since the number of power units that can be turned off is determined according to the real-time working conditions of the train, this number of power units that can be turned off is for the real-time working conditions. After turning off the corresponding power units according to the number of power units that can be turned off, the remaining power units can exert higher efficiency. In this way, by intelligently distributing the power of the traction drive system, the efficiency of the train power system can be maximized, thus achieving the effect of reducing energy consumption.

[0054] Specifically, based on the required output power and the maximum output power of the train at the first moment, the power that can be removed can be determined; according to the number of traction motors included in the power unit and the rated power of the traction motor, the rated power of the power unit can be determined; according to the power that can be removed and the rated power of the power unit, the number of power units that can be turned off can be determined.

[0055] In specific implementation, the number of power units that can be turned off can be obtained by rounding down the quotient of the power that can be removed and the rated power of the power unit. Then, the number of power units that can be turned off of the train can be calculated by the following formula:

[0056]

[0057] Among them, the N unit_cut is the number of power units that can be turned off, the P total is the maximum output power of the train at the first moment, the P need is the required output power, P total - P need is the power that can be removed, the N unit is the number of traction motors included in the power unit, the P IM is the rated power of the traction motor, N unit ·P IMis the rated power of the power unit, and [] is the floor function symbol. When the power unit is a powered axle unit, each power unit includes one traction motor, and N unit is 1; when the power unit is a bogie unit, each power unit includes two traction motors, and N unit is 2; when the power unit is a motor car unit, each power unit includes four traction motors, and N unit is 4.

[0058] S104, control the operation of the train according to the closable quantity of the power unit.

[0059] In the embodiment of the present application, the operation of the train can be controlled according to the closable quantity of the power unit. Specifically, the closable quantity of the motor car unit can be sent to the central control unit (CCU) of the train, so as to use the central control unit to control the operation of the train. The central control unit can perform switching of the power unit according to the closable quantity of the motor car unit, so as to turn off the redundant power unit.

[0060] During specific implementation, a train control command can be sent to the central control unit of the train. The train control command can include the closable quantity of the motor car unit. The train control command can also include the required traction force, so that the central control unit controls the power unit according to the required traction force. During the working process of the central control unit, it can also send the actual traction force to the vehicle controller.

[0061] Refer to Figure 2 As shown, it is a schematic structural diagram of a power control system provided by an embodiment of the present application. The power distribution module is used to execute the foregoing power control method, and can be a functional module in the vehicle controller. The CCU sends the actual traction force F k and the real-time speed v to the power distribution module. The power distribution module can send the closable quantity N unit_cut to the CCU. The CCU can determine the actual operation quantity N motor_num or the closable quantity N unit_cut according to the closable quantity, and use the actual operation quantity N motor_num or the closable quantity N unit_cut to control the motor car unit in combination with the required traction force. The motor car unit can include four powered axle units, and each powered axle unit includes one traction motor.

[0062] An embodiment of the present application provides a power control method, which obtains the real-time speed and running resistance of a train at a first moment, determines the required output power for the train to maintain the real-time speed according to the real-time speed and running resistance, determines the number of power units that can be turned off for the power unit of the train based on the required output power and the maximum output power of the train at the first moment. The power unit can be an axle, a bogie or a motor car. In this way, the operation of the train can be controlled according to the number of power units that can be turned off. Since the number of power units that can be turned off is determined according to the real-time working condition of the train, this number is for the real-time working condition. After turning off the corresponding power units according to the number of power units that can be turned off, the remaining power units can operate with higher efficiency. In this way, by intelligently allocating the power of the traction drive system, the efficiency of the train power system is maximized, thereby achieving the effect of reducing energy consumption.

[0063] Based on the above power control method, an embodiment of the present application further provides a power control device, refer to Figure 3 As shown, it is a structural block diagram of a power control device provided by an embodiment of the present application. The device includes:

[0064] A working condition acquisition unit 110, configured to obtain the real-time speed and running resistance of the train at a first moment;

[0065] A required power determination unit 120, configured to determine the required output power for the train to maintain the real-time speed according to the real-time speed and the running resistance;

[0066] A closable quantity determination unit 130, configured to determine the number of power units that can be turned off for the power unit of the train based on the required output power and the maximum output power of the train at the first moment; the power unit is an axle unit, a bogie unit or a motor car unit;

[0067] An operation control unit 140, configured to control the operation of the train according to the number of power units that can be turned off.

[0068] Optionally, the closable quantity determination unit includes:

[0069] A power removal determination unit, configured to determine the power that can be removed based on the required output power and the maximum output power of the train at the first moment;

[0070] A rated power calculation unit, configured to determine the rated power of the power unit according to the number of traction motors included in the power unit and the rated power of the traction motor;

[0071] A closable quantity determination subunit, configured to determine the number of power units that can be turned off according to the power that can be removed and the rated power of the power unit.

[0072] Optionally, the number of closable power units of the train is calculated by the following formula:

[0073]

[0074] wherein, the N unit_cut is the number of closable power units, the P total is the maximum output power of the train at the first moment, the P need is the required output power, the N unit is the number of traction motors included in the power unit, the P IM is the rated power of the traction motor, and [] is the floor function symbol.

[0075] Optionally, when the power unit is an axle unit, each power unit includes one traction motor; when the power unit is a bogie unit, each power unit includes two traction motors; when the power unit is a motor car unit, each power unit includes four traction motors.

[0076] Optionally, the operation control unit is specifically configured to:

[0077] Send the number of closable power units of the train to the central control unit of the train, so as to control the operation of the train by using the central control unit.

[0078] An embodiment of the present application provides a power control device, which obtains the real-time speed and running resistance of a train at a first moment, determines the required output power for the train to maintain the real-time speed according to the real-time speed and running resistance, determines the number of closable power units of the train based on the required output power and the maximum output power of the train at the first moment. The power unit can be an axle, a bogie or a motor car. In this way, the operation of the train can be controlled according to the number of closable power units. Since the number of closable power units is determined according to the real-time working condition of the train, the number is targeted at the real-time working condition. After closing the corresponding power units according to the number of closable power units, the remaining power units can exert higher efficiency. In this way, by intelligently allocating the power of the traction drive system, the efficiency of the train power system is maximized, thereby achieving the effect of reducing energy consumption.

[0079] As can be seen from the description of the above embodiments, those skilled in the art can clearly understand that all or part of the steps in the above-described embodiment methods can be implemented by means of software plus a general hardware platform. Based on such an understanding, the technical solution of the present application can be embodied in the form of a software product, which can be stored in a storage medium, such as read-only memory (ROM) / RAM, magnetic disk, optical disk, etc., and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network communication device such as a router) to execute the methods described in various embodiments or some parts of the embodiments of the present application.

[0080] The various embodiments in this specification are described in a progressive manner. For the same or similar parts among the various embodiments, reference can be made to each other. Each embodiment focuses on the differences from other embodiments. In particular, for the device embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiments. The device and system embodiments described above are only illustrative. The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical modules, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative efforts.

[0081] The above is only the preferred embodiment of the present application and is not used to limit the protection scope of the present application. It should be noted that for those of ordinary skill in the art in the technical field of the present application, without departing from the premise of the present application, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. A power control method, characterized in that, it includes: Obtain the real-time speed and running resistance of the train at the first moment; According to the real-time speed and the running resistance, determine the required output power for the train to maintain the real-time speed; Based on the required output power and the maximum available output power of the train at the first moment, determine the number of power units of the train that can be shut down; the power unit is an axle unit, a bogie unit or a motor car unit; Wherein, the determining the number of power units of the train that can be shut down based on the required output power and the maximum available output power of the train at the first moment includes: Based on the required output power and the maximum available output power of the train at the first moment, determine the power that can be removed; according to the number of traction motors included in the power unit and the rated power of the traction motor, determine the rated power of the power unit; according to the power that can be removed and the rated power of the power unit, determine the number of power units that can be shut down; Wherein, the number of power units of the train that can be shut down is calculated by the following formula: Among them, the N unit_cut is the closable quantity of the power unit, the P total is the maximum output power of the train at the first moment, the P need is the required output power, the N unit is the number of traction motors included in the power unit, the P IM is the rated power of the traction motor, P total -P need is the removable power, N unit ·P IM is the rated power of the power unit, [] is the floor symbol; when the power unit is an axle drive unit, each power unit includes one traction motor, and the N unit is 1; when the power unit is a bogie unit, each power unit includes two traction motors, and the N unit is 2; when the power unit is a motor car unit, each power unit includes four traction motors, and the N unit is 4; According to the number of power units that can be shut down, control the operation of the train.

2. The method according to claim 1, characterized in that, the controlling the operation of the train according to the number of power units that can be shut down includes: Send the number of power units that can be shut down to the central control unit of the train to control the operation of the train by using the central control unit.

3. A power control device, characterized in that, it includes: A working condition acquisition unit for obtaining the real-time speed and running resistance of the train at the first moment; A required power determination unit for determining the required output power for the train to maintain the real-time speed according to the real-time speed and the running resistance; A shutdown number determination unit for determining the number of power units of the train that can be shut down based on the required output power and the maximum available output power of the train at the first moment; the power unit is an axle unit, a bogie unit or a motor car unit; Wherein, the shutdown number determination unit includes: A removable power determination unit for determining the removable power based on the required output power and the maximum available output power of the train at the first moment; A rated power calculation unit for determining the rated power of the power unit according to the number of traction motors included in the power unit and the rated power of the traction motor; A shutdown number determination subunit for determining the number of power units that can be shut down according to the removable power and the rated power of the power unit; Wherein, the number of power units of the train that can be shut down is calculated by the following formula: wherein, the N unit_cut is the closable quantity of the power unit, the P total is the maximum output power of the train at the first moment, the P need is the required output power, the N unit is the quantity of traction motors included in the power unit, the P IM is the rated power of the traction motor, P total -P need is the removable power, N unit ·P IM is the rated power of the power unit, [] is the floor function symbol; when the power unit is an axle drive unit, each power unit includes one traction motor, and the N unit is 1; when the power unit is a bogie unit, each power unit includes two traction motors, and the N unit is 2; when the power unit is a motor car unit, each power unit includes four traction motors, and the N unit is 4; An operation control unit for controlling the operation of the train according to the number of power units that can be shut down.

4. The device according to claim 3, characterized in that, the operation control unit is specifically used for: Send the number of power units that can be shut down to the central control unit of the train to control the operation of the train by using the central control unit.

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