CN112060940B - Method for prolonging discharge of motor train unit storage battery - Google Patents

Method for prolonging discharge of motor train unit storage battery Download PDF

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Publication number
CN112060940B
CN112060940B CN202010936904.0A CN202010936904A CN112060940B CN 112060940 B CN112060940 B CN 112060940B CN 202010936904 A CN202010936904 A CN 202010936904A CN 112060940 B CN112060940 B CN 112060940B
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bidirectional charger
power supply
storage battery
mode
threshold range
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CN112060940A (en
Inventor
李海洋
张波
迟久鸣
杨东军
朱友远
孙庆文
黎梅云
何欣宇
张国芹
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CRRC Qingdao Sifang Rolling Stock Research Institute Co Ltd
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CRRC Qingdao Sifang Rolling Stock Research Institute Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2200/00—Type of vehicles
    • B60L2200/26—Rail vehicles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles

Abstract

The embodiment of the invention relates to a method for prolonging discharge of a storage battery of a motor train unit, which comprises the following steps: the bidirectional charger identifies the working mode; continuously acquiring voltage data of the storage battery in a pantograph lowering charging mode; when the voltage data is within a preset first threshold range, the bidirectional charger performs first energy-saving power supply processing; when the voltage data is reduced from the first threshold range to the second threshold range, the bidirectional charger performs second energy-saving power supply processing; and when the voltage data is reduced from the second threshold range to the third threshold range, the bidirectional charger performs second energy-saving power supply processing. The embodiment of the invention achieves the purposes of energy-saving control and multi-mode intelligent conversion by automatically identifying the working mode and selecting the corresponding power supply processing flow, and prolongs the standing discharge time of the storage battery.

Description

Method for prolonging discharge of motor train unit storage battery
Technical Field
The invention relates to the technical field of rail transit, in particular to a method for prolonging discharge of a storage battery of a motor train unit.
Background
In order to meet the technical requirements of emergency running, the latest generation of motor train units are designed with power batteries to provide emergency running power for trains, and due to the existence of the power batteries, the bidirectional charger is still in a working state after the trains are powered off, so that a large amount of loss is inevitably generated. Based on the load condition and the battery capacity after the current train bow-lowering power failure, the storage battery can be insufficient when the train is stood to discharge for less than a week, and the use requirements of the train under many working conditions can not be met.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a method for prolonging the discharge of a storage battery of a motor train unit, which can automatically identify a working mode and select a corresponding power supply processing flow according to the working mode, thereby achieving the purposes of energy-saving control and multi-mode intelligent conversion and prolonging the standing discharge time of the storage battery.
In view of this, the embodiment of the invention provides a method for prolonging discharge of a storage battery of a motor train unit, the method is applied to the motor train unit, the motor train unit comprises a bidirectional charger and the storage battery, and the method comprises the following steps:
s1, the bidirectional charger performs work mode identification processing to generate mode data;
s2, when the mode data is in a pantograph lowering charging mode, the bidirectional charger acquires the battery voltage of the storage battery to generate first voltage data; when the first voltage data is within a preset first threshold range, the bidirectional charger performs first energy-saving power supply processing;
s3, in the first energy-saving power supply processing process, or when the first voltage data is not in a preset first threshold range, the bidirectional charger acquires the battery voltage of the storage battery to generate second voltage data; when the second voltage data is within a preset second threshold range, the bidirectional charger performs second energy-saving power supply processing;
s4, in the second energy-saving power supply processing process, or when the second voltage data is not in a preset second threshold range, the bidirectional charger acquires the battery voltage of the storage battery to generate third voltage data; and when the third voltage data is within a preset third threshold range, the bidirectional charger performs third energy-saving power supply processing.
Preferably, the first and second liquid crystal materials are,
the motor train unit also comprises a control network, a bidirectional charger, a storage battery, a power battery, an uninterrupted power supply bus, an alternating current bus and a direct current load;
the bidirectional charger comprises an emergency starting power panel and a power supply switch;
the mode data comprises a normal mode and the pantograph charging mode;
the first threshold range is higher than the second threshold range, which is higher than the third threshold range.
Preferably, the bidirectional charger performs a work mode identification process to generate mode data, and the method specifically includes:
the bidirectional charger is communicated with the control network according to a preset first frequency to generate a first state;
when the first state is communication normal, the bidirectional charger modifies the mode data into the normal mode;
and when the first state is communication failure, the bidirectional charger modifies the mode data into the reduced bow charging mode.
Preferably, the method further comprises: the working mode of the storage battery is consistent with that of the bidirectional charger, and when the working mode of the bidirectional charger is the normal mode, the working mode of the storage battery is also the normal mode; and when the working mode of the bidirectional charger is the pantograph-descending charging mode, the working mode of the storage battery is also the pantograph-descending charging mode.
Preferably, the method further comprises:
when the mode data is the normal mode, the bidirectional charger restarts the whole machine and disconnects the power supply switch; the bidirectional charger obtains first alternating current from the alternating current bus, performs alternating current-direct current conversion on the first alternating current to obtain first direct current, and charges the power battery by using the first direct current; and the bidirectional charger converts the output voltage of the first direct current to obtain a second direct current, charges the storage battery by using the second direct current, and supplies power to the direct current load by using the second direct current through the uninterrupted power supply bus.
Preferably, when the first voltage data is within a preset first threshold range, the bidirectional charger performs a first energy-saving power supply process, and specifically includes:
when the first voltage data is within the first threshold range, the bidirectional charger performs charging function shutdown processing and closes the power supply switch; and the storage battery supplies power to the direct current load through the uninterrupted power supply bus.
Preferably, when the second voltage data is within a preset second threshold range, the bidirectional charger performs a second energy-saving power supply process, and the method specifically includes:
and when the second voltage data is within the second threshold range, the emergency starting power panel supplies power to the direct-current load through the uninterrupted power supply bus.
Preferably, when the third voltage data is within a preset third threshold range, the bidirectional charger performs third energy-saving power supply processing, and specifically includes:
when the third voltage data is within the third threshold range, the bidirectional charger restarts a charging function and turns off the power supply switch; the bidirectional charger obtains a first output voltage from the power battery, converts the first output voltage into a second output voltage, and then supplies power to the direct-current load through the uninterrupted power supply bus by using the second output voltage; and meanwhile, the bidirectional charger charges the storage battery.
When the bidirectional charger charges the storage battery, the bidirectional charger acquires the battery voltage of the storage battery to generate fourth voltage data; when the fourth voltage data exceeds a preset recovery voltage threshold, the bidirectional charger performs charging function shutdown processing and closes the power supply switch; and the storage battery supplies power to the direct current load through the uninterrupted power supply bus.
Further, the method further comprises:
when the bidirectional charger obtains the first output voltage from the power battery, the bidirectional charger receives fault information sent by the power battery and generates first fault information; and when the first fault information is an undervoltage three-level fault, the bidirectional charger is disconnected from the power battery.
The method for prolonging the discharge of the storage battery of the motor train unit, provided by the embodiment of the invention, at least has the following technical effects or advantages: 1. the embodiment of the invention provides an automatic switching processing method which is suitable for a new generation of motor train units with an emergency traveling function; 2. the embodiment of the invention can select the power supply mode of the load of the uninterruptible power supply bus according to the load condition of the uninterruptible power supply bus; 3. the embodiment of the invention prolongs the standing discharge time of the storage battery.
Drawings
FIG. 1 is a schematic diagram of a method for prolonging discharge of a storage battery of a motor train unit according to an embodiment of the invention;
FIG. 2 is a schematic diagram of connection relationships of internal components of a motor train unit according to an embodiment of the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Fig. 1 is a schematic view of a method for prolonging discharge of a storage battery of a motor train unit according to an embodiment of the present invention, where the motor train unit includes a bidirectional charger, the storage battery, a control network, the bidirectional charger, the storage battery, a power battery, an uninterruptible power supply bus, an ac bus, and a dc load; as shown in FIG. 1, the method for prolonging the discharge of the storage battery of the motor train unit comprises the following steps:
s1, the bidirectional charger performs work mode identification processing to generate mode data;
the bidirectional charger comprises an emergency starting power panel and a power supply switch; the mode data comprises a normal mode and a pantograph lowering charging mode;
here, as shown in fig. 2, which is a schematic diagram of connection relationships among components in the motor train unit provided in the embodiment of the present invention, the control network may communicate with all the components, and the bidirectional charger may communicate with the power battery and the storage battery; the bidirectional charger can take electricity from the alternating current bus, supply power to the power battery and the storage battery after AC/DC conversion or supply power to a direct current load through the uninterrupted power supply bus; the bidirectional charger can also take electricity from a power battery, supply power to a storage battery after DC/DC conversion, or supply power to a direct current load through an uninterrupted power supply bus; the emergency starting power panel is one of the internal components of the bidirectional charger, and can supply power to a direct current load through an uninterrupted power supply bus after a power supply switch is switched on; the power supply switch between the emergency starting power panel and the storage battery consists of two diodes, after the switch is closed, the side with higher output voltage is selected as a power supply side between the emergency starting power panel and the storage battery, and then the uninterrupted power supply bus is used for supplying power to the direct current load; here, when the power supply switch is closed, the unselected one is actually in an open circuit, thereby solving the loss of the storage battery in a low voltage state and prolonging the discharge time of the storage battery;
the mode data is the working mode data of the motor train unit and at least comprises a normal mode and a pantograph lowering charging mode; the normal mode indicates that the motor train unit normally gets electricity from the pantograph net and normally operates; the pantograph-descending charging mode indicates that the motor train unit cannot get electricity from a pantograph net, an alternating current bus is dead, and the whole motor train unit is in a power-off state;
the method specifically comprises the following steps: s11, the bidirectional charger performs communication processing with a control network according to a preset first frequency to generate a first state;
here, the bidirectional charger has a handshake communication agreement with the control network, the bidirectional charger needs to send alive information or similar data to the control network every short time, if normal information returned from the control network is obtained, the control network works normally, and the train is not in a power-off state; otherwise, if abnormal information such as communication overtime occurs, the control network is offline, and the train is in a power-off state;
here, when the train is in the non-power-off state, the first state is normal communication; otherwise, when the train is in the non-power-off state, the first state is communication failure;
s12, when the first state is communication normal, the bidirectional charger modifies the mode data into a normal mode;
the normal mode indicates that the motor train unit normally gets electricity from the pantograph net and normally operates;
and S13, when the first state is communication failure, the bidirectional charger modifies the mode data into a pantograph lowering charging mode.
Here, the pantograph-descending charging mode indicates that the motor train unit cannot take electricity from the pantograph net, the alternating-current bus is dead, and the whole motor train unit is in a power-off state.
The above-mentioned contents are that the bidirectional charger described can not only automatically switch from the normal mode to the pantograph lowering charging mode, but also automatically switch from the pantograph lowering charging mode back to the normal mode according to the network communication state.
In addition, a load contactor is arranged between other non-uninterrupted power supply buses of the motor train unit and a load, and the state of the load contactor and the existence of the power failure of the motor train unit have the following corresponding relation: when the motor train unit normally takes electricity, the load contactor is in a closed state; when the motor train unit is powered off, the load contactor is in an off state. The load contactor status is accessible by the charger. Thus, the bidirectional charger can also perform mode switching by recognizing the state (closed or opened) of the load contactor: when the load contactor is in a closed state, the bidirectional charger modifies the mode data into a normal mode; when the load contactor state is an off state, the bidirectional charger modifies the mode data into a reduced bow charging mode.
The working mode of the storage battery is consistent with that of the bidirectional charger, and when the working mode of the bidirectional charger is a normal mode, the working mode of the storage battery is also the normal mode; when the working mode of the bidirectional charger is the pantograph-lowering charging mode, the working mode of the storage battery is also the pantograph-lowering charging mode;
here, there are many ways to achieve this synchronization, and it is common that the bidirectional charger is responsible for synchronizing the mode data with the storage battery or the power battery, and the bidirectional charger can only complete the synchronization in the reduced bow charging mode, although the control network can also force the synchronization in the normal mode.
S2, when the mode data is in the bow-reducing charging mode, the bidirectional charger acquires the battery voltage of the storage battery to generate first voltage data; when the first voltage data is within a preset first threshold range, the bidirectional charger performs first energy-saving power supply processing;
when the first voltage data is within a preset first threshold range, the bidirectional charger performs a first energy-saving power supply process, and the method specifically includes: when the first voltage data is within a first threshold range, the bidirectional charger performs charging function shutdown processing and closes the power supply switch; the storage battery supplies power to the direct current load through the uninterrupted power supply bus.
Here, when the battery is in operation, its output voltage will decrease with time; the first threshold range, the second threshold range and the third threshold range mentioned here and below are three threshold ranges in the process of reducing the output voltage of the storage battery, wherein the first threshold range is higher than the second threshold range, and the second threshold range is higher than the third threshold range (for example, the first threshold range is larger than the direct current 115 volts, the second threshold range is between 100 volts and 110 volts, and the third threshold range is smaller than 100 volts);
when the output voltage of the storage battery is in the first threshold range, the output voltage of the storage battery is higher than the output voltage of the emergency starting power supply board, the emergency starting power supply board is in an open circuit, and only the storage battery supplies power to all direct current loads; in addition, at this stage, the bidirectional charger also can close the internal AC/DC conversion function, the DC/DC function and the charging and discharging function; therefore, the no-load power consumption of the bidirectional charger is reduced, and the discharge time of the storage battery is prolonged.
S3, in the first energy-saving power supply processing process, or when the first voltage data is not in the preset first threshold range, the bidirectional charger acquires the battery voltage of the storage battery to generate second voltage data; when the second voltage data is within a preset second threshold range, the bidirectional charger performs second energy-saving power supply processing;
when the second voltage data is within the preset second threshold range, the bidirectional charger performs a second energy-saving power supply process, and the method specifically includes: and when the second voltage data is within the second threshold range, the emergency starting power panel supplies power to the direct current load through the uninterrupted power supply bus.
Here, during the first energy-saving power supply process, the bidirectional charger may continuously monitor the output voltage (first voltage data) of the storage battery, and after finding that the first voltage data is not within the preset first threshold range, the bidirectional charger may start the second threshold range judgment of S3;
when the output voltage of the storage battery is reduced from the first threshold range to the second threshold range, the output voltage of the storage battery may be lower than the output voltage of the emergency starting power supply board, and the storage battery is in an open circuit, and all direct current loads are supplied with power by the emergency starting power supply board instead; in addition, at this stage, the bidirectional charger still turns off the internal AC/DC function, DC/DC function and charging and discharging function; therefore, the low power consumption state of the bidirectional charger is maintained, the standby power consumption of the storage battery is reduced to the minimum, and the discharge time of the storage battery is further prolonged.
S4, in the second energy-saving power supply processing process, or when the second voltage data is not in the preset second threshold range, the bidirectional charger acquires the battery voltage of the storage battery to generate third voltage data; when the third voltage data is within a preset third threshold range, the bidirectional charger performs third energy-saving power supply processing;
when the third voltage data is within the preset third threshold range, the bidirectional charger performs third energy-saving power supply processing, and the method specifically includes: when the third voltage data is within a third threshold range, the bidirectional charger restarts the charging function and switches off the power supply switch; the bidirectional charger obtains a first output voltage from the power battery, converts the first output voltage into a second output voltage, and then supplies power to the direct-current load through the uninterrupted power supply bus by using the second output voltage; meanwhile, the bidirectional charger carries out charging processing on the storage battery.
Here, during the second energy-saving power supply process, the bidirectional charger may continuously monitor the output voltage (second voltage data) of the storage battery, and after finding that the second voltage data is not within the preset second threshold range, the bidirectional charger may start the third threshold range judgment of S4;
here, when the output voltage of the storage battery is in the third threshold range, the output voltage of the storage battery has dropped below the rated voltage, and at this time, the bidirectional charger needs to switch on the power battery and take power therefrom (the first output voltage, for example, 660V DC) to perform DC/DC conversion to obtain a second output voltage (for example, 124V DC); after the second output voltage is obtained, the bidirectional charger needs to perform two operations at the same time: supplying power to a dc load, and charging a battery.
In addition, when the bidirectional charger performs charging processing on the storage battery, the bidirectional charger acquires the battery voltage of the storage battery to generate fourth voltage data; when the fourth voltage data exceeds a preset recovery voltage threshold, the bidirectional charger shuts down the charging function and closes the power supply switch; the storage battery supplies power to the direct current load through the uninterrupted power supply bus.
When the bidirectional charger charges the storage battery, the output voltage of the storage battery needs to be continuously monitored, and when the fourth voltage data exceeds a preset recovery voltage threshold (for example, 115 volts direct current), it indicates that the storage battery has the power supply capability again, and the bidirectional charger can stop charging the storage battery, so that the bidirectional charger turns off the internal AC/DC function, the DC/DC function and the charge-discharge function again, and turns on the power supply switch; the storage battery supplies power to the direct current load again through the uninterrupted power supply bus. Therefore, the charging of the storage battery is finished, and the bidirectional charger is automatically switched from the working power consumption state to the standby low power consumption state, so that the effect of prolonging the discharging time of the storage battery can be achieved.
When the bidirectional charger obtains the first output voltage from the power battery, the bidirectional charger receives fault information sent by the power battery and generates first fault information; and when the first fault information is an undervoltage three-level fault, the bidirectional charger is disconnected from the power battery.
Here, as can be seen from the foregoing, the bidirectional charger may communicate with the power battery, and when the bidirectional charger obtains the first output voltage from the power battery, the bidirectional charger may also obtain the fault information sent from the power battery; when the internal electric quantity of the power battery is lower than an output threshold value, sending undervoltage three-level fault information to a bidirectional charger; after the bidirectional charger obtains the undervoltage three-level fault information, the connection with the power battery is disconnected, so that unnecessary no-load power consumption of the power battery is reduced, and the discharge time of the storage battery is prolonged.
And finally, after the motor train unit returns to power supply, the mode data can be switched from the pantograph-descending charging mode to the normal mode. When the mode data is in a normal mode, the bidirectional charging machine can perform complete machine restarting processing and disconnect a power supply switch; the bidirectional charger obtains first alternating current from the alternating current bus, performs AC/DC conversion on the first alternating current to obtain first direct current, and then charges the power battery by using the first direct current; the bidirectional charger is also used for carrying out DC/DC conversion processing on the first direct current to obtain a second direct current, then charging the storage battery by using the second direct current, and meanwhile, supplying power to the direct current load by using the second direct current through the uninterrupted power supply bus.
In summary, the technical solution provided in the embodiments of the present invention at least has the following technical effects or advantages: 1. the embodiment of the invention provides an automatic switching processing method which is suitable for a new generation of motor train units with emergency traveling functions; 2. the embodiment of the invention can select the power supply mode of the load of the uninterruptible power supply bus according to the load condition of the uninterruptible power supply bus; 3. the embodiment of the invention prolongs the standing discharge time of the storage battery.
Those of skill would further appreciate that the various illustrative components and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied in hardware, a software module executed by a processor, or a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (4)

1. A method for prolonging discharge of a storage battery of a motor train unit is applied to the motor train unit, the motor train unit comprises a bidirectional charger and the storage battery, and the method comprises the following steps:
s1, the bidirectional charger performs work mode identification processing to generate mode data;
s2, when the mode data is in a pantograph lowering charging mode, the bidirectional charger acquires the battery voltage of the storage battery to generate first voltage data; when the first voltage data is within a preset first threshold range, the bidirectional charger performs first energy-saving power supply processing;
s3, in the first energy-saving power supply processing process, or when the first voltage data is not in a preset first threshold range, the bidirectional charger acquires the battery voltage of the storage battery to generate second voltage data; when the second voltage data is within a preset second threshold range, the bidirectional charger performs second energy-saving power supply processing;
s4, in the second energy-saving power supply processing process, or when the second voltage data is not in a preset second threshold range, the bidirectional charger acquires the battery voltage of the storage battery to generate third voltage data; when the third voltage data is within a preset third threshold range, the bidirectional charger performs third energy-saving power supply processing;
the motor train unit comprises a control network, the bidirectional charger, the storage battery, a power battery, an uninterrupted power supply bus, an alternating current bus and a direct current load;
the bidirectional charger comprises an emergency starting power panel and a power supply switch;
the mode data comprises a normal mode and the pantograph charging mode;
the first threshold range is higher than the second threshold range, which is higher than the third threshold range;
the bidirectional charger performs work mode identification processing to generate mode data, and the method specifically comprises the following steps:
the bidirectional charger is communicated with the control network according to a preset first frequency to generate a first state;
when the first state is communication normal, the bidirectional charger modifies the mode data into the normal mode;
when the first state is communication failure, the bidirectional charger modifies the mode data into the bow-reducing charging mode;
when the first voltage data is within a preset first threshold range, the bidirectional charger performs a first energy-saving power supply process, and the method specifically includes:
when the first voltage data is within the first threshold range, the bidirectional charger performs charging function shutdown processing and closes the power supply switch; the storage battery supplies power to the direct-current load through the uninterrupted power supply bus;
when the second voltage data is within a preset second threshold range, the bidirectional charger performs a second energy-saving power supply process, specifically including:
when the second voltage data is within the second threshold range, the emergency starting power panel supplies power to the direct-current load through the uninterruptible power supply bus;
when the third voltage data is within a preset third threshold range, the bidirectional charger performs third energy-saving power supply processing, and the method specifically includes:
when the third voltage data is within the third threshold range, the bidirectional charger restarts a charging function and turns off the power supply switch; the bidirectional charger obtains a first output voltage from the power battery, converts the first output voltage into a second output voltage, and then supplies power to the direct-current load through the uninterrupted power supply bus by using the second output voltage; meanwhile, the bidirectional charger charges the storage battery;
when the bidirectional charger charges the storage battery, the bidirectional charger acquires the battery voltage of the storage battery to generate fourth voltage data; when the fourth voltage data exceeds a preset recovery voltage threshold, the bidirectional charger performs charging function shutdown processing and closes the power supply switch; the storage battery supplies power to the direct-current load through the uninterrupted power supply bus;
a load contactor is arranged between other non-uninterrupted power supply buses of the motor train unit and a load, and when the motor train unit normally takes power, the load contactor is in a closed state; when the motor train unit is powered off, the load contactor is in a disconnected state; the state of the load contactor can be acquired by the bidirectional charger; the bidirectional charger switches modes by identifying the state of the load contactor: when the state of the load contactor is the closed state, the bidirectional charger modifies the mode data into the normal mode; and when the state of the load contactor is the disconnection state, the bidirectional charger modifies the mode data into the reduced bow charging mode.
2. The method for extended discharge of the storage battery of the motor train unit according to claim 1, further comprising:
the working mode of the storage battery is consistent with that of the bidirectional charger, and when the working mode of the bidirectional charger is the normal mode, the working mode of the storage battery is also the normal mode; and when the working mode of the bidirectional charger is the pantograph-descending charging mode, the working mode of the storage battery is also the pantograph-descending charging mode.
3. The method for extended discharge of the storage battery of the motor train unit according to claim 1, further comprising:
when the mode data is the normal mode, the bidirectional charger restarts the whole machine and disconnects the power supply switch; the bidirectional charger obtains first alternating current from the alternating current bus, performs alternating current-direct current conversion on the first alternating current to obtain first direct current, and charges the power battery by using the first direct current; and the bidirectional charger converts the output voltage of the first direct current to obtain a second direct current, charges the storage battery by using the second direct current, and supplies power to the direct current load by using the second direct current through the uninterrupted power supply bus.
4. The method for extended discharge of the storage battery of the motor train unit according to claim 1, further comprising:
when the bidirectional charger obtains the first output voltage from the power battery, the bidirectional charger receives fault information sent by the power battery and generates first fault information; and when the first fault information is an undervoltage three-level fault, the bidirectional charger is disconnected from the power battery.
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