Positioning-based control method and system for traction of storage battery to pass through non-electric area

Abstract

The invention relates to the technical field of urban rail transit power supply and control, and discloses a positioning-based control method and system for traction of a storage battery to pass through a non-power area, and the method comprises the steps: collecting the real-time position and operation speed of a train, and calculating the prediction time of reaching the non-power area; outputting a non-power area approaching judgment signal and activating a traction mode of the storage battery; executing current limiting control based on a safe discharge threshold value in the non-electric area; and when the train is close to the exit position of the non-power area, the storage battery traction mode is quitted, and three-rail power supply is recovered. Compared with the prior art that train power and auxiliary power supply continuity cannot be guaranteed due to the fact that the train passes through a non-electric area by means of inertia sliding, especially under the condition that the distance of the non-electric area is long or ramp resistance exists, high-performance storage battery traction and intelligent power supply switching based on positioning are introduced; continuous traction and auxiliary power supply of the train in a non-power area are realized, so that the problems of train stagnation and power supply interruption are avoided, and the operation reliability is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of urban rail transit power supply and control technology, and particularly relates to a battery traction over non-electric area control method and system based on positioning. BACKGROUND

[0002] At present, the third rail power supply mode is widely used in urban rail transit systems, and its basic principle is to set a live rail beside the running track, and supply power to the vehicle through the contact between the current collector and the third rail. This mode has become the mainstream power supply mode of subway, light rail and other urban rail systems due to its compact structure, suitability for underground lines, high power supply efficiency and other advantages. However, due to the consideration of line structure and operation safety, insulation section or non-electric area must be set in some track sections, for example, to avoid electrical short circuit between different tracks in the turnout area, to carry out power grid partition maintenance and isolation in the interval, or to short-time disconnect the power supply in special safety areas such as the vehicle depot and the maintenance warehouse.

[0003] In the prior art, the main way for the train to pass through the non-electric area is for the driver to cut off the power supply circuit in advance and rely on inertia to slide through, but this method has obvious shortcomings. When the non-electric area is long or there is a slope on the line, the inertia of the vehicle is difficult to support the whole sliding process, and it is easy to stop in the middle of the non-electric area, the rescue and restart process is complex, and it seriously affects the operation order of the line. During the sliding period in the non-electric area, the air conditioning, lighting, broadcasting, communication and other auxiliary equipment of the vehicle cannot operate normally due to the complete interruption of the third rail power supply, which not only affects the passenger comfort, but also weakens the information and safety guarantee in emergency situations. In addition, this method relies on the driver to operate manually according to the marker points, and there is a risk of untimely operation, judgment error and insufficient response, and the reliability is low, especially in high-frequency operation and complex working conditions. At the same time, the existing technology only relies on inertia to complete the passing process, without introducing energy compensation and intelligent scheduling mechanism, lacking battery energy storage or energy optimization means, and it is difficult to adapt to the needs of line extension, slope increase or energy saving and consumption reduction.

[0004] Therefore, there is an urgent need for a new control scheme that can realize continuous power supply of traction and auxiliary power when the train passes through the non-electric area, and realizes automatic switching through positioning and intelligent control, in order to improve the safety, reliability and passenger comfort of urban rail vehicles when running in the non-electric area. SUMMARY

[0005] In view of the above technical deficiencies, the purpose of the present application is to provide a battery traction over non-electric area control method based on positioning, which aims to solve the technical problem that the existing technology relies on inertia to slide through the non-electric area, especially when the non-electric area is long or there is a slope resistance, which cannot guarantee the continuity of the power supply of the train.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: The present invention provides a positioning-based battery traction control method for crossing areas without electricity. The location-based battery traction control method for crossing unpowered areas includes: Step S10: Collect the train's current position coordinates at time t using pre-set electronic tags on the ground and a pre-set on-board positioning unit. Obtain train speed Starting point of the area with no electricity And based on the current position coordinates Train speed and the starting point of the powerless zone Determine the predicted time to reach the power-free zone ; Step S20: Predicting the time to reach the powerless zone Less than or equal to the time threshold for reaching the powerless zone When the system enters a power-free zone, it determines that it has entered the power-free zone and sends a power-free zone proximity determination signal. Simultaneously receive the power disconnection status flag signal. When the power is disconnected, the status flag signal is displayed. When the value is 1, the battery traction mode is activated, and the battery traction power supply status parameter set S is collected in real time; Step S30: In the power-free zone, perform current limiting control based on the battery traction power supply state parameter set S; Step S40: Obtain the current position coordinates With respect to the pre-set exit location of the power-free zone The difference When the difference Less than the preset export difference threshold When this happens, the battery traction mode will be exited and the three-rail power supply mode will be re-entered. Step S50: After entering the three-rail power supply mode, the preset battery pack is switched back to the auxiliary power supply mode.

[0007] Preferably, in step S10, the electronic tags pre-set on the ground include RFID passive tags for providing segment identification information; NFC near-field communication tags for providing high-precision position correction; and optical QR code tags for providing redundant positioning information in special environments.

[0008] Preferably, in step S20, the battery traction power supply status parameter set S includes the preset real-time output voltage parameters of the battery pack b. Real-time output current parameters and real-time target power parameters S={ , , }

[0009] Preferably, in step S20, the predicted time for reaching the powerless zone is... Greater than the time threshold for reaching the powerless zone At that time, the signal indicating the proximity of the powerless zone was detected. =0; Predicted time to reach the powerless zone Less than or equal to the time threshold for reaching the powerless zone At that time, a signal indicating the proximity of a power-off zone is sent. =1.

[0010] Preferably, step S30, the step of performing current limiting control based on the battery traction power supply state parameter set S in the power-free zone, specifically includes: calculating the total battery discharge current based on the battery traction power supply state parameter set S in the power-free zone. When the total discharge current of the battery Less than or equal to the preset battery safe discharge threshold When the battery discharges, maintain the battery traction mode; when the total battery discharge current... Greater than the battery's safe discharge threshold In this case, current limiting control is performed by sending a command to reduce the torque of the traction motor.

[0011] Preferably, in step S30, the battery safe discharge threshold is... Used to constrain the discharge rate and thermal safety range of battery packs.

[0012] Preferably, in step S50, after entering the three-rail power supply mode, the method further includes charging the preset battery pack.

[0013] The present invention also provides a positioning-based battery traction control system for crossing areas without electricity, comprising: The position prediction module is used to collect the train's current position coordinates at time t through pre-set electronic tags on the ground and a preset on-board positioning unit. Obtain train speed Starting point of the area with no electricity And based on the current position coordinates Train speed and the starting point of the powerless zone Determine the predicted time to reach the power-free zone ; The power supply switching module is used to predict the time when reaching a power-off zone. Less than or equal to the time threshold for reaching the powerless zone When the system enters a power-free zone, it determines that it has entered the power-free zone and sends a power-free zone proximity determination signal. Simultaneously receive the power disconnection status flag signal. When the power is disconnected, the status flag signal is displayed. When the parameter is 1, the battery traction mode is activated, and a battery traction power supply state parameter set S is collected in real time; A current limiting control module is configured to perform current limiting control based on the battery traction power supply state parameter set S in the no-electricity area; An exit determination module is configured to obtain a current position coordinate and a preset exit position of the no-electricity area , and calculate a difference value between the current position coordinate and the preset exit position of the no-electricity area When the difference value is less than a preset exit difference threshold value , the battery traction mode is exited, and the three-rail power supply mode is re-entered. A battery rollback module is configured to roll back a preset battery pack to an auxiliary power supply mode after the three-rail power supply mode is entered.

[0014] The application also provides a battery traction through no-electricity area control device based on positioning, which comprises a memory, a processor, and a battery traction through no-electricity area control program based on positioning stored in the memory and executable on the processor, and the battery traction through no-electricity area control program based on positioning realizes the battery traction through no-electricity area control method based on positioning when executed by the processor.

[0015] The application also provides a computer program product comprising a battery traction through no-electricity area control program based on positioning, which realizes the battery traction through no-electricity area control method based on positioning when executed by a processor.

[0016] The application has the advantages that the accurate prediction and automatic switching of the train entering and exiting the no-electricity area are realized by combining the ground electronic tag with the vehicle-mounted positioning unit, the reliability problem existing in the traditional driver operation or pure inertial sliding mode is avoided, and the safety and stability of the power supply switching process are ensured.

[0017] The application introduces the high-performance battery traction mode and implements the discharge current threshold control in the no-electricity area, which ensures the continuous power supply of the traction power and auxiliary system, avoids the train stalling in the long-distance or slope no-electricity area, effectively reduces the battery over-discharge risk, and improves the stability and passenger comfort of the system operation. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0019] Figure 1 This is a flowchart illustrating the first embodiment of a positioning-based battery traction control method for passing through an unpowered area according to the present invention.

[0020] Figure 2 This is a schematic diagram of an improved train passing through a powerless zone, representing a first embodiment of a positioning-based battery traction control method for passing through a powerless zone according to the present invention.

[0021] Figure 3 This is a schematic diagram of a device for a positioning-based battery traction control method for passing through an unpowered area according to the present invention. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Example 1: As Figure 1 The diagram shown is a flowchart of the first embodiment of the battery traction control method for passing through a powerless zone based on positioning according to the present invention. The first embodiment of the battery traction control method for passing through a powerless zone based on positioning according to the present invention is presented.

[0024] In the first embodiment, the location-based battery traction control method for crossing a powerless zone includes: Step S10: Collect the train's current position coordinates at time t using pre-set electronic tags on the ground and a pre-set on-board positioning unit. Obtain train speed Starting point of the area with no electricity And based on the current position coordinates Train speed and the starting point of the powerless zone Determine the predicted time to reach the power-free zone ; Step S20: Predicting the time to reach the powerless zone Less than or equal to the time threshold for reaching the powerless zone When the system enters a power-free zone, it determines that it has entered the power-free zone and sends a power-free zone proximity determination signal. Simultaneously receive the power disconnection status flag signal. When the power is disconnected, the status flag signal is displayed. When the value is 1, the battery traction mode is activated, and the battery traction power supply status parameter set S is collected in real time; Step S30: In the power-free zone, perform current limiting control based on the battery traction power supply state parameter set S; Step S40: Obtain the current position coordinates With respect to the pre-set exit location of the power-free zone The difference When the difference Less than the preset export difference threshold When this happens, the battery traction mode will be exited and the three-rail power supply mode will be re-entered. Step S50: After entering the three-rail power supply mode, the preset battery pack is switched back to the auxiliary power supply mode.

[0025] It should be noted that the electronic tag in step S10 refers to a positioning and identification device pre-deployed on the track surface, including RFID passive tags, NFC near-field communication tags, or optical QR code tags, used to provide position correction information for the vehicle positioning unit; the battery traction power supply status parameter set S refers to the real-time operating parameters of the battery collected in steps S20 and S30, including real-time voltage, current, output power, and the corresponding battery temperature and state of charge (SOC), used for subsequent current limiting and exit logic control judgment.

[0026] Understandably, this invention ensures that the train can remain under control when passing through areas without power, preventing it from stopping and requiring emergency repairs, and eliminating the need to turn off the air conditioning. For passengers, the train can pass through areas without them noticing, thus improving the train's availability and passenger comfort.

[0027] It should be understood that, compared to the traditional method of relying on inertia for coasting, this invention maintains stable train speed and continuous power supply to auxiliary systems by keeping the battery drive and inverter working continuously in areas without electricity. This avoids the problems of vehicles easily stalling in long-distance areas without electricity and auxiliary equipment stopping, which leads to a decrease in comfort and safety. Especially in complex conditions such as slopes and long sections, this solution can ensure that the train passes smoothly.

[0028] For example, such as Figure 3 As shown, on a line with a power-off zone, when a train enters the power-off zone at a speed of 60 km / h, the train speed decreases significantly at the exit of the section using the traditional method, and the auxiliary system shuts down. However, by using the method of this invention, the train is powered by battery traction throughout the power-off zone, and the speed is basically maintained at close to 60 km / h, with a speed decrease of less than 2% at the exit. At the same time, the onboard air conditioning and lighting systems are continuously powered, verifying the significant superiority of this invention in terms of power maintenance and comfort.

[0029] Embodiment two: In addition, the application provides a positioning-based storage battery traction over-dead-zone control system, which adopts the positioning-based storage battery traction over-dead-zone control method in the above embodiment, and can solve the technical problem of the positioning-based storage battery traction over-dead-zone control. Compared with the prior art, the positioning-based storage battery traction over-dead-zone control system provided by the application has the same beneficial effects as the positioning-based storage battery traction over-dead-zone control method provided by the above embodiment, and other technical features of the positioning-based storage battery traction over-dead-zone control system are the same as the features disclosed in the above embodiment method, which will not be repeated here.

[0030] Embodiment three: The application provides a positioning-based storage battery traction over-dead-zone control device, please refer to Figure 3A location-based battery traction over a dead zone control device includes at least one processor and a memory connected to the at least one processor in communication, wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the location-based battery traction over a dead zone control method of embodiment 1. The location-based battery traction over a dead zone control device of the embodiments can include, but is not limited to, a mobile terminal such as a mobile phone, a notebook, a digital broadcasting receiver, a PDA (Personal Digital Assistant), a PAD (Portable Application Description), a PMP (Portable Media Player), a vehicle terminal (e.g., a car navigation terminal), and the like, and a stationary terminal such as a digital TV, a desktop computer, and the like. The location-based battery traction over a dead zone control device is only an example and should not impose any limitation on the function and use range of the embodiments. The location-based battery traction over a dead zone control device can include a processing device 1001 (e.g., a central processing unit, a graphic processing unit, or the like) that can perform various appropriate actions and processes according to programs stored in a read-only memory 1002 or loaded into a random access memory 1004 from a storage device 1003. The random access memory 1004 also stores various programs and data required for the operation of the location-based battery traction over a dead zone control device. The processing device 1001, the read-only memory 1002, and the random access memory 1004 are connected to each other through a bus 1005. An I / O interface 1006 is also connected to the bus. In general, the following systems can be connected to the I / O interface 1006: an input device 1007 including, for example, a touch screen, a touch pad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, or the like; an output device 1008 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, or the like; the storage device 1003 including, for example, a magnetic tape, a hard disk, or the like; and a communication device 1009. The communication device 1009 can allow the location-based battery traction over a dead zone control device to communicate wirelessly or wiredly with other devices to exchange data. Although the location-based battery traction over a dead zone control device having various systems is illustrated in the drawing, it should be understood that all of the illustrated systems are not required to be implemented or provided. More or less systems can be alternatively implemented or provided.

[0031] Embodiment four: the application also provides a computer program product, comprising a computer program, which, when executed by a processor, implements the steps of the above-mentioned positioning-based control method for battery traction through a dead zone. The computer program product provided by the application can solve the technical problem of a positioning-based control method for battery traction through a dead zone. Compared with the prior art, the computer program product provided by the application has the same beneficial effects as the positioning-based control method for battery traction through a dead zone provided by the above-mentioned embodiments, and will not be described here.

[0032] In particular, the processes described above with reference to the flowcharts can be implemented as a computer software program according to embodiments of the application. For example, embodiments of the application include a computer program product comprising a computer program carried on a computer readable medium, the computer program comprising program code for performing the methods illustrated by the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device, or installed from a storage device 1003, or installed from a read-only memory 1002. When the computer program is executed by a processing device 1001, the above-mentioned functions defined in the methods of the embodiments of the application are performed.

[0033] It should be understood that various parts of the application disclosed can be realized in hardware, software, firmware or a combination thereof. In the description of the above-mentioned embodiments, specific features, structures, materials or characteristics can be combined in any appropriate manner in one or more embodiments or examples.

[0034] Obviously, those skilled in the art can make various modifications and variations to the application without departing from the spirit and scope of the application. Thus, if these modifications and variations of the application fall within the scope of the claims of the application and their equivalent technologies, the application also intends to include these modifications and variations.

Claims

1. A method for controlling a battery traction through a dead zone based on positioning, characterized in that, The method comprises: Step S10: Collect the current position coordinate of the train at time t through the electronic tag preset on the ground and the preset vehicle-mounted positioning unit , obtain the train running speed and the starting position of the no-power zone section , and determine the predicted time of arrival at the no-power zone based on the current position coordinate , the train running speed and the starting position of the no-power zone section ;​ Step S20: When reaching the no-electricity zone prediction time less than or equal to the no-electricity zone time threshold , it is determined that the no-electricity zone is entered and a no-electricity zone approaching determination signal is sent , a power receiving disconnection state flag signal is received at the same time ; when the power receiving disconnection state flag signal is 1, the battery traction mode is activated, and a battery traction power supply state parameter set S is collected in real time; Step S30: performing current-limiting control based on the battery traction power supply state parameter set S in the power-off area; Step S40: obtaining the current position coordinate the difference between the preset outlet position of the non-electric zone When the difference is less than the preset outlet difference threshold value , the battery traction mode is exited and the three-rail power supply mode is re-entered.​ Step S50: after entering the three-rail power supply mode, the preset battery pack is rolled back to the auxiliary power supply mode.

2. A method for controlling a battery traction over an unpowered zone based on positioning as claimed in claim 1, characterized in that, In step S10, the electronic tag preset on the ground includes an RFID passive tag for providing section identification information, an NFC near field communication tag for providing high-precision position correction, and an optical two-dimensional code tag for providing redundant positioning information in special environments.

3. The battery traction control method for crossing a powerless zone based on positioning as described in claim 1, characterized in that, In step S20, the battery traction power supply state parameter set S includes the preset real-time output voltage parameter of the battery pack b , the real-time output current parameter , and the real-time target power parameter , S={ , , }.

4. The method for controlling battery traction through a powerless zone based on positioning as described in claim 1, characterized in that, In step S20, when the approach time to the no-current zone is greater than the approach time threshold to the no-current zone , the no-current zone approach determination signal = 0; when the approach time to the no-current zone is less than or equal to the approach time threshold to the no-current zone , the no-current zone approach determination signal = 1 is transmitted.

5. The battery traction control method for crossing a powerless zone based on positioning as described in claim 1, characterized in that, In step S30, the step of performing current limiting control in the no-electricity zone based on the battery traction power supply state parameter set S specifically includes: calculating the total battery discharge current in the no-electricity zone based on the battery traction power supply state parameter set S When the total battery discharge current is less than or equal to a preset battery safe discharge threshold , the battery traction mode is maintained; when the total battery discharge current is greater than the battery safe discharge threshold , the current limiting control is performed by sending a reduced traction motor torque instruction.

6. A method for controlling a battery traction over an unpowered zone based on positioning as claimed in claim 5, characterized in that, In step S30, the battery safe discharge threshold to constrain the discharge rate of the battery pack to the thermal safe range.

7. A method for controlling a battery traction over an unpowered zone based on positioning as claimed in claim 1, characterized in that, In step S50, after entering the three-rail power supply mode, the preset battery pack is also charged.

8. A positioning-based control system for battery traction through a dead zone, applied to the positioning-based control method for battery traction through a dead zone according to any one of claims 1 to 7, characterized in that, The positioning-based battery traction power-off area control system comprises: A position prediction module is configured to collect the current position coordinate of the train at time t by means of an electronic tag preset on the ground and a preset vehicle-mounted positioning unit , obtain the train running speed , and the starting position of the non-electric zone section , and determine the predicted time of arrival at the non-electric zone based on the current position coordinate , the train running speed , and the starting position of the non-electric zone section ;​ Power supply switching module for determining the approach to the no-electricity area and sending the no-electricity area approach determination signal when the time threshold of the approach to the no-electricity area is reached is less than or equal to the time threshold of the approach to the no-electricity area , the no-electricity area is determined to be approached and the no-electricity area approach determination signal is sent , the power receiving off state flag signal is received at the same time ; when the power receiving off state flag signal is 1, the battery traction mode is activated and the battery traction power supply state parameter set S is collected in real time A current-limiting control module for performing current-limiting control based on the battery traction power supply state parameter set S in the power-off area; an exit determination module configured to obtain a current position coordinate and a preset no-electricity zone exit position , and calculate a difference value between the current position coordinate and the preset no-electricity zone exit position , and when the difference value is less than a preset exit difference threshold value , exit the battery traction mode and re-enter the three-rail power supply mode A battery rollback module for rolling back the preset battery pack to the auxiliary power supply mode after entering the three-rail power supply mode.

9. A positioning-based battery traction control device for crossing an unpowered area, characterized in that, The positioning-based battery traction power-off area control device comprises a memory, a processor, and a positioning-based battery traction power-off area control program stored in the memory and executable on the processor, and the positioning-based battery traction power-off area control program implements the positioning-based battery traction power-off area control method in any one of claims 1 to 7 when executed by the processor.

10. A computer program product, characterised in that, The computer program product comprises a positioning-based battery traction power-off area control program, and the positioning-based battery traction power-off area control program implements the positioning-based battery traction power-off area control method in any one of claims 1 to 7 when executed by the processor.

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