CN113014078A - Energy absorption method for a rail vehicle - Google Patents

Energy absorption method for a rail vehicle Download PDF

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Publication number
CN113014078A
CN113014078A CN202110431120.7A CN202110431120A CN113014078A CN 113014078 A CN113014078 A CN 113014078A CN 202110431120 A CN202110431120 A CN 202110431120A CN 113014078 A CN113014078 A CN 113014078A
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China
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voltage
phase
power supply
energy absorption
transformer
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CN202110431120.7A
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CN113014078B (en
Inventor
陈卫兵
张洋
姚鸿洲
胡涵
李娅
水新虎
廖泳竣
唐邓
金笃保
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Chongqing CRRC Long Passenger Railway Vehicles Co Ltd
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Chongqing CRRC Long Passenger Railway Vehicles Co Ltd
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Publication of CN113014078A publication Critical patent/CN113014078A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/10—Arrangements incorporating converting means for enabling loads to be operated at will from different kinds of power supplies, e.g. from ac or dc
    • 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
    • B60L7/00—Electrodynamic brake systems for vehicles in general
    • B60L7/10—Dynamic electric regenerative braking
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • 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
    • Y02T10/72—Electric energy management in electromobility

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The invention relates to the technical field of rail transit control, in particular to an energy absorption method for a rail vehicle, which comprises the steps of acquiring power supply information of a train when the train is braked, wherein the power supply information comprises direct current power supply and alternating current power supply; according to the power supply information, the energy absorption device is connected to a direct current bus of direct current power supply or two output ends of a three-phase to single-phase transformer of alternating current power supply; when the power supply information is AC power supply, a step-down rectification component is connected between one output end of the three-phase to single-phase transformer and the energy absorption device; the energy absorption device comprises a positive end and a negative end which are electrically connected with two ends of a direct current bus or two output ends of the three-phase to single-phase transformer, and a switch cabinet, a filter cabinet, a chopper cabinet and an energy absorption resistor which are arranged between the positive end and the negative end and are electrically connected in sequence. The invention can fully absorb the energy of train braking, maintain the voltage stability of the power grid and avoid the temperature rise in the station and the tunnel.

Description

Energy absorption method for a rail vehicle
Technical Field
The invention relates to the technical field of rail transit control, in particular to an energy absorption method for a rail vehicle.
Background
With the rapid development of urban rail transit construction in China, subways become the main mode of urban rail transit, but bring about a lot of problems at the same time. Because the distance between subway stations is short, the trains need to be frequently started and braked in the running process, a large amount of mechanical energy stored in the subway trains in the braking process can be converted into electric energy, heat energy and the like, and the adverse effect on the running of power station equipment and the trains is easily caused if the mechanical energy is not processed or recycled by means. For example, a large amount of mechanical energy of a subway train is consumed by equipment such as a brake resistor in the braking process, only a small part of mechanical energy is absorbed and reused, the utilization rate of energy is low, and a large amount of heat is discharged to the surrounding environment, so that the temperature in a station and a tunnel is increased. And the train can feed back energy to the power grid when braking, and when the part of energy can not be completely absorbed by other vehicles or electric equipment, the voltage of the power grid can be increased, which is very unfavorable for the operation of power station equipment and vehicles, so that a device is needed to consume the residual energy to maintain the voltage of the power grid stable and avoid the temperature increase in the station and in the tunnel.
Disclosure of Invention
The invention aims to provide an energy absorption method for a railway vehicle, which can fully absorb the energy of train braking, maintain the voltage of a power grid stable and avoid the temperature rise in a station and a tunnel.
In order to achieve the above object, there is provided an energy absorption method for a rail vehicle, comprising the steps of:
when a train is braked, acquiring power supply information of the train, wherein the power supply information comprises direct current power supply and alternating current power supply;
according to the power supply information, the energy absorption device is connected to a direct current bus of direct current power supply or two output ends of a three-phase to single-phase transformer of alternating current power supply;
when the power supply information is AC power supply, a step-down rectification component is connected between one output end of the three-phase to single-phase transformer and the energy absorption device;
the energy absorption device comprises a positive end and a negative end which are electrically connected with two ends of a direct current bus or two output ends of the three-phase to single-phase transformer, and a switch cabinet, a filter cabinet, a chopper cabinet and an energy absorption resistor which are arranged between the positive end and the negative end and are electrically connected in sequence.
The principle and the advantages are as follows:
1. switching of an access line of the energy absorption device is performed according to the power supply information, for example, when the train selects direct current power supply, a line or a device corresponding to direct current is conducted, and when the train selects direct current power supply, a line or a device corresponding to alternating current is conducted, so that energy absorption in two power supply modes can be completed by using the same energy absorption device conveniently. Therefore, the problem that a plurality of energy absorption devices need to be arranged, and the equipment cost is increased is avoided.
2. The setting of energy absorption device, the setting of cubical switchboard be convenient for the holistic open and close control of energy absorption device, avoid external electric power direct input to energy absorption device wholly in, and lead to the easy condition of damaging of energy absorption device. The chopper rails can control the absorption of energy, the tolerance energy of current and voltage is strong, a complex peripheral protection circuit is not needed, the circuit structure is simple, the required manufacturing cost is low, and the stability and the reliability are high. The energy absorption resistor can convert energy into heat energy, only the energy absorption device is arranged outside, the heat which is emitted can be prevented from being concentrated in a station or a hole, the temperature in the station and the hole is increased, and after the energy is consumed, the stability of the voltage of a power grid can be maintained, so that the power supply of the train is more stable, and the train can run more safely.
3. The energy absorption device adopts the design of functional modularization, and is very convenient to install, replace, disassemble, maintain and the like. And the circuit which is easy to generate heat is separated, so that the phenomenon that the device is damaged due to overheating because the heat is concentrated at one position can be avoided. The energy absorption device is arranged outside the station in a combined mode, so that sufficient heat dissipation can be realized, and the temperature rise in the station and the tunnel caused by the concentration of the dissipated heat in the station or the tunnel is avoided.
Further, the method also comprises the following steps:
the energy absorption device comprises an energy absorption device, a direct current bus or a three-phase change single-phase transformer, a cable and a first control switch, wherein the energy absorption device is electrically connected with the positive end of the energy absorption device and the output end of the direct current bus or the three-phase change single-phase transformer;
and a cable is arranged and electrically connected with the negative end of the energy absorption device and the output end of the direct current bus or the three-phase change single-phase transformer, and a second control switch is arranged at the position of the cable close to the output end of the direct current bus or the three-phase change single-phase transformer.
The effect is as follows: can set up energy absorbing device outside the station through setting up the cable, can avoid the heat that energy absorbing device produced to give off in the subway station, lead to the temperature rise in the station to need set up extra equipment and cool down, increase construction cost. The arrangement of the first control switch and the second control switch can prevent direct current after the direct current bus or the three-phase single-phase transformer is subjected to voltage reduction and rectification from being directly input into the whole energy absorption device and forming multi-stage control with the switch cabinet through the arrangement of the cable and the control switch because the energy absorption device cannot be arranged close to a power supply grid.
Further, the first control switch is a direct current breaker or an alternating current breaker, and the second control switch is an electric isolating switch.
The direct current breaker or the alternating current breaker is connected into a direct current power grid or an alternating current power grid, the filter cabinet, the chopper cabinet and the energy absorption resistor are isolated from the power supply grid by the isolating switch so as to carry out debugging, detection and fault treatment, and the filter cabinet is used for inhibiting when short circuit occurs, so that the breaker is ensured to trip reliably.
Further, the method also comprises the following steps:
the set voltage transmitter detects an actual voltage of the dc bus.
The effect is as follows: the voltage of the direct current bus is convenient to detect in real time, and therefore the influence of train braking on a power grid is convenient to detect when a train brakes.
Further, the method also comprises the following steps:
calculating voltage parameters input to the direct current bus by the rectifier transformer and the rectifier according to the setting parameters of the rectifier transformer and the rectifier on the direct current bus;
and comparing and analyzing the calculated voltage parameter with the actual voltage detected by the voltage transmitter, and judging that the train is in direct current power supply and braking when the actual voltage is greater than the voltage parameter.
The effect is as follows: the rectifier transformer and the rectifier convert rated high-voltage alternating current into rated low-voltage direct current, and the low-voltage direct current is kept stable and can be conveniently calculated and provided for a direct current bus as input voltage. When the train is braked, the voltage transmitter can detect the output voltage of the direct current bus to the train, when the actual voltage is greater than the voltage parameter, the train can be judged to be in direct current power supply and braked, and the energy absorption device needs to be started to stabilize the voltage of the direct current bus when the condition that the energy is fed back to a power grid exists. The circuit structure is simple, and detection control is easy to realize.
Further, the step-down rectification component comprises a step-down transformer and a rectifier which are sequentially connected, and the single-phase high-voltage alternating current is converted into low-voltage direct current suitable for the energy absorption device.
The effect is as follows: the voltage reduction rectification component can convert single-phase high-voltage alternating current into low-voltage direct current suitable for the energy absorption device to use, so that the energy absorption device suitable for the direct current can also be suitable for a train to use under the condition of selecting alternating current power supply, and other energy absorption devices are saved and additionally arranged, and the equipment cost is increased.
Further, the method also comprises the following steps:
a voltage transmitter is arranged and is connected in series with the first control switch, the energy absorption device and the second control switch.
The effect is as follows: the direct current voltage converted by the voltage reduction rectification component can be detected in real time conveniently, so that the train can select alternating current power supply conveniently, and the influence of train braking on a power grid can be detected when the train is braked.
Further, the method also comprises the following steps:
calculating voltage parameters of direct current output according to the setting parameters of the three-phase to single-phase transformer and the voltage reduction rectification component;
and comparing and analyzing the calculated voltage parameter with the actual voltage detected by the voltage transmitter, and judging that the train is in alternating current power supply and braking when the actual voltage is greater than the voltage parameter.
The effect is as follows: rated three-phase alternating current is converted into rated single-phase alternating current by the three-phase-to-single-phase transformer, the single-phase alternating current is kept stable and can be conveniently obtained through parameter calculation of the three-phase-to-single-phase transformer, and the single-phase alternating current is converted into stable direct current by the voltage reduction rectification component. Single-phase alternating current is supplied as an input voltage to the train. When the train is braked, the voltage transmitter can detect the voltage of the direct current output by the voltage reduction rectification assembly, and when the actual voltage is greater than the voltage parameter, the train can be judged to be in alternating current power supply and braked, and the energy absorption device needs to be started to stabilize the voltage of the contact network under the condition of energy feedback to the power grid. The adopted circuit structure is simple and easy to realize detection control.
Further, the method also comprises the following steps:
a shunt is connected in series with the first control switch, and the on-off state of the first control switch is detected and analyzed;
and a shunt is connected in series with the second control switch, and the on-off state of the second control switch is detected and analyzed.
The effect is as follows: when the train is braked and the condition of feeding back energy to the power grid is analyzed, the energy absorption device can be started, the first control switch and the second control switch are required to be opened at the moment, and the shunt can detect the magnitude of current on the loop, so that the opening and closing states of the first control switch and the second control switch are detected and analyzed, and whether the energy absorption device is connected to the power grid or not is analyzed. Thereby monitoring the normal operation of the energy absorption device.
Drawings
FIG. 1 is a logic block diagram of an energy absorption system for a rail vehicle according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of an energy absorption system for a rail vehicle.
Detailed Description
The following is further detailed by way of specific embodiments:
reference numerals in the drawings of the specification include: the device comprises a step-down rectification assembly 1, an energy absorption device 2, a voltage transmitter 3, a shunt 4, a direct current breaker 216 and an electric isolating switch 316.
Examples
An energy absorption method for a rail vehicle, applied to an energy absorption system for a rail vehicle, said system being substantially as described with reference to figures 1 and 2 of the accompanying drawings: the method comprises the following steps:
train information acquisition device: the system comprises a power supply module, a power supply module and a control module, wherein the power supply module is used for acquiring power supply information of a train when the train is braked, and the power supply information comprises direct current power supply and alternating current power supply;
AC-DC absorbs the selector: the energy absorption device 2 is connected to the direct current bus when the direct current power supply is identified; and is also used for connecting the energy absorption device 2 to two output ends of the three-phase to single-phase transformer when the alternating current power supply is identified. The energy absorption device 2 is connected to a dc bus or to two output terminals of a three-phase to single-phase transformer, which can be realized by a double-pole double-throw electric control switch S in this embodiment, or by other control switches in other embodiments, and is mainly used to switch the energy absorption device 2 into the dc bus or the two output terminals of the three-phase to single-phase transformer.
A step-down rectification component 1 is arranged between an output end of the three-phase to single-phase transformer and the energy absorption device 2, and the step-down rectification component 1 comprises a step-down transformer and a rectifier which are sequentially connected. The step-down rectification component 1 is used for step-down rectifying the single-phase alternating current of 27.5KV into direct current of 1500V. When the power supply information is direct current power supply, the electric control switch S is closed rightwards, so that the direct current bus is communicated with the energy absorption device 2; when the power supply information is alternating current power supply, the electric control switch S is closed rightwards, so that the step-down rectification component 1 is connected between one output end of the three-phase to single-phase transformer and the energy absorption device 2.
Energy-absorbing device 2: the energy absorption device is used for absorbing energy fed back to the direct current bus or the three-phase change single-phase transformer during braking. The energy absorption device 2 comprises a positive end and a negative end which are electrically connected with two ends of a direct current bus or two output ends of a three-phase to single-phase transformer, and a switch cabinet, a filter cabinet, a chopper cabinet and an energy absorption resistor which are arranged between the positive end and the negative end and are sequentially connected in series. Wherein, adopt current filter circuit among the filtering cabinet for filter out the ripple in the output voltage. The chopper cabinet adopts the existing chopper circuit for controlling the current on the energy absorption resistor, and the energy absorption resistor is used for consuming energy and converting electric energy into heat energy to be consumed.
The positive end of the energy absorption device 2 is electrically connected with the output end of the direct current bus or the three-phase change single-phase transformer through a cable and is provided with a first control switch, and the negative end of the energy absorption device 2 is electrically connected with the output end of the direct current bus or the three-phase change single-phase transformer through a cable and is provided with a second control switch. The first control switch and the second control switch are closer to the output end of the direct current bus or the three-phase to single-phase transformer than the energy absorption device 2 so as to form multi-stage switch control with the switch cabinet, thereby protecting the circuit.
The first control switch is a dc breaker 216 or an ac breaker, in this embodiment, the first control switch between the positive terminal of the energy absorption device 2 and the dc bus is the dc breaker 216, and the first control switch between the positive terminal of the energy absorption device 2 and the output terminal of the three-phase to single-phase transformer is also the dc breaker 216 due to the addition of the step-down rectification component. The second control switch is an electric isolating switch 316. The first control switch and the second control switch are respectively connected in series with a shunt 4. The shunt 4 can detect and analyze whether the cable on which the first control switch and the second control switch are located is energized.
In this embodiment, the on/off of the circuit breaker can also be instructed by the control center, so that the energy absorption device 2 of this embodiment is cut off from the power supply network.
And a voltage transmitter 3 for detecting the actual voltage of the direct current bus is arranged on the direct current bus. And a first voltage transformer 7 is arranged at the current electric input ends of the rectifier and the rectifier on the direct current bus and is used for detecting the input voltage of alternating current input to the rectifier and the rectifier.
And a second voltage transformer 5 for detecting the input voltage of the alternating current is arranged at the three-phase alternating current input end of the three-phase to single-phase transformer, and a third voltage transformer 6 for detecting the actual output voltage of the actually output alternating current is arranged at one output end of the three-phase to single-phase transformer.
The train information processing device: the system is used for analyzing the power supply information of the train and the braking condition according to the power parameters of the power supply loop equipment and the detection parameters of the voltage transmitter 3, the first voltage transformer 7, the second voltage transformer 5 and the third voltage transformer 6. The power supply loop equipment comprises a rectifier transformer, a rectifier and a voltage reduction and finishing assembly. The detection parameters comprise the step-down parameter proportion of the rectifier transformer and the rectifier and the step-down parameter proportion of the three-phase to single-phase transformer. The method specifically comprises the following steps:
in the case of direct current supply:
the voltage calculation and measurement module: the voltage parameter calculating device is used for calculating the voltage parameters normally output to the direct current bus by the rectifier transformer and the rectifier according to the voltage reduction parameter proportion of the rectifier transformer and the rectifier on the direct current bus; for example, if the ratio of the step-down parameters of the rectifier transformer and the rectifier is 0.15, then in the case that the three-phase ac of 10KV provided by the urban power supply network is kept stable, the rectifier transformer and the rectifier will convert the three-phase ac (the three-phase ac of 10KV is multiplied by 0.15) into the dc of 1500V, and the dc of 1500V is used as the voltage parameter that the rectifier transformer and the rectifier normally output to the dc bus.
A comparison analysis module: and the voltage parameter is used for comparing and analyzing the voltage parameter obtained by the voltage calculation and measurement module with the actual voltage detected by the voltage transmitter, and when the actual voltage is greater than the voltage parameter, the train is judged to be in direct current power supply and braking. The voltage parameter normally output by the rectifier transformer and the rectifier to the direct current bus is 1500V, and if the actual voltage detected by the voltage transmitter 3 exceeds 1500V, the train feeds energy back to the power grid, and the train is judged to be in direct current power supply and braking.
When the actual voltage detected by the voltage transmitter 3 is larger than 1500V of the voltage parameter normally output to the DC bus by the rectifier transformer and the rectifier, the energy absorption device adjusts the current at two ends of the energy absorption resistor according to the voltage difference between the actual voltage and the voltage parameter, and the larger the voltage difference is, the larger the current at two ends of the energy absorption resistor is, so that the energy absorption resistor can quickly consume the energy fed back to the DC bus when the train brakes.
In the case of ac supply:
the voltage calculation and measurement module: the device is also used for calculating the AC normal output voltage which is normally output by one output end of the three-phase to single-phase transformer according to the step-down parameter proportion of the three-phase to single-phase transformer and the AC input voltage input by the input end of the three-phase to single-phase transformer; for example, the step-down parameter ratio of a three-phase to single-phase transformer is 2.75. Under the condition that 10KV three-phase alternating current provided by an urban power supply network is kept stable, the three-phase to single-phase transformer converts the 10KV three-phase alternating current into 27.5KV single-phase alternating current, and the voltage reduction rectifying assembly 1 converts the 27.5KV single-phase alternating current into 1500V direct current.
A comparison analysis module: and the system is also used for comparing and analyzing the calculated normal output voltage of the alternating current with the actual output voltage of the alternating current detected by the voltage transformer, and when the actual output voltage of the alternating current is greater than the normal output voltage of the alternating current, the train is judged to be powered by the alternating current and braked. For example, if the calculated normal output voltage of the alternating current is 27.5KV, and the voltage detected by the third voltage transformer 6 is greater than 27.5KV but not equal to 27.5KV, it indicates that the train is powered by the alternating current and is braking, wherein the electric energy fed back to the power grid causes the height of the power grid voltage, and therefore the energy absorption device 2 needs to be started.
When the actual output voltage of the alternating current detected by the second voltage transformer 5 is greater than 27.5KV of the rectifier transformer and the normal output voltage of the alternating current, the energy absorption device adjusts the current at the two ends of the energy absorption resistor according to the voltage difference between the actual output voltage of the alternating current and the normal output voltage of the alternating current, and the larger the voltage difference is, the larger the current at the two ends of the energy absorption resistor is, so that the energy absorption resistor can quickly consume the energy fed back to the three-phase to single-phase transformer when the train brakes.
Energy absorption method for a rail vehicle, comprising in particular the steps of:
s1, a first voltage transformer is arranged to detect the input voltage of the input alternating current before the step-down rectification of a rectifier transformer and a rectifier on the direct current bus; the set voltage transmitter detects an actual voltage of the dc bus.
The method comprises the steps of setting a second voltage transformer to detect the input voltage of alternating current input by the input end of the three-phase to single-phase transformer, and setting a third voltage transformer to detect the actual output voltage of the alternating current at the output end of the three-phase to single-phase transformer.
And S2, analyzing the power supply information of the train and the braking condition according to the power parameters of the power supply circuit equipment and the detection parameters of the voltage transmitter 3, the first voltage transformer 7, the second voltage transformer 5 and the third voltage transformer 6. The power supply loop equipment comprises a rectifier transformer, a rectifier and a voltage reduction and finishing assembly. The detection parameters comprise the step-down parameter proportion of the rectifier transformer and the rectifier and the step-down parameter proportion of the three-phase to single-phase transformer. The method specifically comprises the following two steps:
s201, calculating voltage parameters normally output to the direct current bus by a rectifier transformer and a rectifier according to the voltage reduction parameter proportion of the rectifier transformer and the rectifier on the direct current bus;
and comparing and analyzing the calculated voltage parameter with the actual voltage detected by the voltage transmitter, and judging that the train is in direct current power supply and braking when the actual voltage is greater than the voltage parameter.
S202, calculating the normal output voltage of the alternating current which is normally output by one output end of the three-phase to single-phase transformer according to the step-down parameter proportion of the three-phase to single-phase transformer and the input voltage of the alternating current which is input by the input end of the three-phase to single-phase transformer;
and comparing and analyzing the calculated normal output voltage of the alternating current with the actual output voltage of the alternating current detected by the voltage transformer, and judging that the train supplies power for the alternating current and brakes when the actual output voltage of the alternating current is greater than the normal output voltage of the alternating current.
S3, when the train is braked, acquiring power supply information of the train, wherein the power supply information comprises direct current power supply and alternating current power supply;
and S4, connecting the energy absorption device 2 to a direct current bus of direct current power supply or two output ends of a three-phase to single-phase transformer of alternating current power supply according to the power supply information. The method specifically comprises the following two steps:
s401, when the power supply information is direct current power supply, controlling the electric control switch S to be closed rightwards, and connecting the direct current bus with the energy absorption device 2;
and S402, when the power supply information is AC power supply, controlling the electric control switch S to be closed leftwards, so that the step-down rectification component 1 is connected between one output end of the three-phase to single-phase transformer and the energy absorption device 2.
S5, arranging a cable, electrically connecting the positive terminal of the energy absorption device 2 with the output terminal of the direct current bus or the three-phase change single-phase transformer, and arranging a first control switch at the position of the cable close to the output terminal of the direct current bus or the three-phase change single-phase transformer; the method specifically comprises the following two steps:
s501, electrically connecting the positive end of the energy absorption device 2 with a positive bus of a direct current bus through a cable, and arranging a first control switch at a position of the cable close to the positive bus, wherein the first control switch is connected with a shunt 4 in series;
and S502, electrically connecting the positive end of the energy absorption device 2 and the step-down rectification assembly 1 through a cable, and arranging a first control switch at a position of the cable close to the step-down rectification assembly 1, wherein the first control switch is connected with the shunt 4 in series.
And S6, arranging a cable, electrically connecting the negative end of the energy absorption device 2 with the output end of the direct current bus or the three-phase change single-phase transformer, and arranging a second control switch at the position of the cable close to the output end of the direct current bus or the three-phase change single-phase transformer. The method specifically comprises the following two steps:
s601, electrically connecting the negative end of the energy absorption device 2 with a negative bus of the direct current bus through a cable, and arranging a second control switch at a position of the cable close to the negative bus, wherein the second control switch is connected with the shunt 4 in series;
and S602, electrically connecting the negative end of the energy absorption device 2 with the output end of the three-phase to single-phase transformer through a cable, and arranging a second control switch at the position of the cable close to the step-down rectification component 1, wherein the second control switch is connected with the shunt 4 in series.
S7, when the actual voltage detected by the voltage transmitter 3 is larger than the voltage parameter 1500V normally output by the rectifier transformer and the rectifier to the DC bus, the energy absorption device adjusts the current at the two ends of the energy absorption resistor according to the voltage difference between the actual voltage and the voltage parameter, the larger the voltage difference is, the larger the current at the two ends of the energy absorption resistor is, and the energy fed back to the DC bus when the train brakes can be quickly consumed by the energy absorption resistor.
S8, when the actual output voltage of the alternating current detected by the second voltage transformer 5 is greater than the rectifier transformer and the normal output voltage of the alternating current by 27.5KV, the energy absorption device adjusts the current at the two ends of the energy absorption resistor according to the voltage difference between the actual output voltage of the alternating current and the normal output voltage of the alternating current, and the larger the voltage difference is, the larger the current at the two ends of the energy absorption resistor is, so that the energy absorption resistor can quickly consume the energy fed back to the three-phase to single-phase transformer when the train is braked.
The foregoing is merely an example of the present invention, and common general knowledge in the field of known specific structures and characteristics is described herein in more detail, so that a person of ordinary skill in the art can understand all the prior art in the field and have the ability to apply routine experimentation before the present date, after knowing that all the common general knowledge in the field of the invention before the application date or the priority date of the invention, and the person of ordinary skill in the art can, in light of the teaching provided herein, combine his or her own abilities to complete and implement the present invention, and some typical known structures or known methods should not become an obstacle to the implementation of the present invention. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.

Claims (9)

1. Energy absorption method for a rail vehicle, characterized in that it comprises the following steps:
when a train is braked, acquiring power supply information of the train, wherein the power supply information comprises direct current power supply and alternating current power supply;
according to the power supply information, the energy absorption device is connected to a direct current bus of direct current power supply or two output ends of a three-phase to single-phase transformer of alternating current power supply;
when the power supply information is AC power supply, a step-down rectification component is connected between one output end of the three-phase to single-phase transformer and the energy absorption device;
the energy absorption device comprises a positive end and a negative end which are electrically connected with two ends of a direct current bus or two output ends of the three-phase to single-phase transformer, and a switch cabinet, a filter cabinet, a chopper cabinet and an energy absorption resistor which are arranged between the positive end and the negative end and are electrically connected in sequence.
2. The energy absorbing method for a rail vehicle according to claim 1, characterized in that: further comprising the steps of:
the energy absorption device comprises an energy absorption device, a direct current bus or a three-phase change single-phase transformer, a cable and a first control switch, wherein the energy absorption device is electrically connected with the positive end of the energy absorption device and the output end of the direct current bus or the three-phase change single-phase transformer;
and a cable is arranged and electrically connected with the negative end of the energy absorption device and the output end of the direct current bus or the three-phase change single-phase transformer, and a second control switch is arranged at the position of the cable close to the output end of the direct current bus or the three-phase change single-phase transformer.
3. The energy absorbing method for a rail vehicle according to claim 2, characterized in that: the first control switch is a direct current breaker or an alternating current breaker, and the second control switch is an electric isolating switch.
4. The energy absorbing method for a rail vehicle according to claim 1, characterized in that: further comprising the steps of:
the method comprises the steps that a first voltage transformer is arranged to detect the input voltage of alternating current input by a rectifier transformer and a rectifier on a direct current bus before voltage reduction and rectification;
the set voltage transmitter detects an actual voltage of the dc bus.
5. The energy absorbing method for a rail vehicle according to claim 4, characterized in that: further comprising the steps of:
calculating voltage parameters normally output to the direct current bus by the rectifier transformer and the rectifier according to the voltage reduction parameter proportion of the rectifier transformer and the rectifier on the direct current bus and the input voltage of the alternating current;
and comparing and analyzing the calculated voltage parameter with the actual voltage detected by the voltage transmitter, and judging that the train is in direct current power supply and braking when the actual voltage is greater than the voltage parameter.
6. The energy absorbing method for a rail vehicle according to claim 1, characterized in that: the step-down rectification component comprises a step-down transformer and a rectifier which are sequentially connected, and converts the single-phase high-voltage alternating current into low-voltage direct current suitable for the energy absorption device.
7. The energy absorbing method for a rail vehicle of claim 6, wherein: further comprising the steps of:
the method comprises the steps of setting a second voltage transformer to detect the input voltage of alternating current input by the input end of the three-phase to single-phase transformer, and setting a third voltage transformer to detect the actual output voltage of the alternating current at the output end of the three-phase to single-phase transformer.
8. The energy absorbing method for a rail vehicle according to claim 7, characterized in that: further comprising the steps of:
calculating the normal output voltage of the alternating current which is normally output by one output end of the three-phase to single-phase transformer according to the step-down parameter proportion of the three-phase to single-phase transformer and the input voltage of the alternating current which is input by the input end of the three-phase to single-phase transformer;
and comparing and analyzing the calculated normal output voltage of the alternating current with the actual output voltage of the alternating current detected by the voltage transformer, and judging that the train supplies power for the alternating current and brakes when the actual output voltage of the alternating current is greater than the normal output voltage of the alternating current.
9. The energy absorbing method for a rail vehicle according to claim 2, characterized in that: further comprising the steps of:
a shunt is connected in series with the first control switch, and the on-off state of the first control switch is detected and analyzed;
and a shunt is connected in series with the second control switch, and the on-off state of the second control switch is detected and analyzed.
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