CN112810453B - Non-contact power supply system and hanging train - Google Patents
Non-contact power supply system and hanging train Download PDFInfo
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- CN112810453B CN112810453B CN202110025531.6A CN202110025531A CN112810453B CN 112810453 B CN112810453 B CN 112810453B CN 202110025531 A CN202110025531 A CN 202110025531A CN 112810453 B CN112810453 B CN 112810453B
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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
- B60L9/00—Electric propulsion with power supply external to the vehicle
- B60L9/16—Electric propulsion with power supply external to the vehicle using ac induction motors
- B60L9/18—Electric propulsion with power supply external to the vehicle using ac induction motors fed from dc supply lines
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
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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
- H02M1/32—Means for protecting converters other than automatic disconnection
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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- 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
Abstract
The invention provides a non-contact power supply system and a hanging train, wherein the system comprises: the power transmitting subsystem and the vehicle-mounted power receiving subsystem are connected with each other through a power transmission network; the electric energy transmitting subsystem comprises an inverter and a transmitting cable; wherein the transmitting cable is of a multi-turn parallel winding structure; the plurality of inverters are provided, each inverter is provided with a plurality of output interfaces, and the plurality of output interfaces of each inverter are respectively connected with a plurality of access terminals in the transmitting cable; the vehicle-mounted electric energy receiving subsystem comprises a pickup device, a rectifier and an energy storage device; the inverter converts externally-accessed direct current into alternating current and then transmits the alternating current to the transmitting cable, and the transmitting cable generates an alternating magnetic field based on the alternating current; the pick-up device converts the alternating magnetic field into alternating current by magnetic field coupling, and then the alternating current is converted into direct current by the rectifier, which is stored in the energy storage device.
Description
Technical Field
The invention relates to the technical field of rail transit, in particular to a non-contact power supply system and a hanging train.
Background
The hanging train is a train with a carriage suspended below a track at a certain distance from the ground, and has the advantages of small occupied area and the like.
The hanging train generally uses electric energy as power for running. In the prior art, a hanging train commonly adopts a vehicle-mounted current collector to realize power supply by sliding contact with a power supply rail on a track beam. The ground DC750/1500V power supply is connected to the train high-voltage box to supply power for the train traction, auxiliary and storage battery charging system.
Specifically, a direct current power supply with external voltage of 750/1500V is connected to a vehicle-mounted main fuse box of a hanging train through a three-rail current receiving system to supply power for a train traction, auxiliary and storage battery charging system. The three-rail current receiving system comprises a left current receiving arm, a left carbon sliding plate, a right current receiving arm and a right carbon sliding plate. When the three-rail current-collecting system works normally, the left (right) current-collecting arm presses the left (right) carbon slide plate on the conductive rail to collect current.
In order to realize normal current receiving, the current receiving system needs a whole set of pressure maintaining and limiting mechanism, so that the carbon slide plate and the conductive rail maintain proper pressure to ensure normal contact. Because the carbon sliding plate needs to keep a certain thickness under the normal abrasion condition, the whole current-collecting system needs a great amount of daily maintenance work, and the running and maintenance cost is increased.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a non-contact power supply system and a hanging train.
The invention provides a non-contact power supply system, comprising: the power transmitting subsystem and the vehicle-mounted power receiving subsystem are connected with each other through a power transmission network;
the electric energy transmitting subsystem comprises an inverter and a transmitting cable; wherein the transmitting cable is of a multi-turn parallel winding structure; the plurality of inverters are provided, each inverter is provided with a plurality of output interfaces, and the plurality of output interfaces of each inverter are respectively connected with a plurality of access terminals in the transmitting cable; the vehicle-mounted electric energy receiving subsystem comprises a pickup device, a rectifier and an energy storage device;
the inverter converts externally-accessed direct current into alternating current and then transmits the alternating current to the transmitting cable, and the transmitting cable generates an alternating magnetic field based on the alternating current;
the pick-up device converts the alternating magnetic field into alternating current by magnetic field coupling, and then the alternating current is converted into direct current by the rectifier, which is stored in the energy storage device.
According to the non-contact power supply system provided by the invention, the pick-up device comprises a foam board, a magnetic core, a coil and a compensation capacitor; wherein, the liquid crystal display device comprises a liquid crystal display device,
the magnetic core is placed on the foam board, the coil is arranged on the magnetic core, and the compensation capacitor is connected with the coil in a series connection mode.
According to the non-contact power supply system provided by the invention, the magnetic core is provided with a plurality of single sheets, the single sheets are spliced into a double-U-shaped structure in an equidistant mode, and the double-U-shaped structure is arranged on the foam board.
According to the non-contact power supply system provided by the invention, the working frequency of the inverter is not lower than 20kHz.
According to the non-contact power supply system provided by the invention, the energy storage device is a DC/DC energy storage device, and the DC/DC energy storage device converts direct current output by the rectifier into direct current with preset voltage and stores the direct current.
According to the non-contact power supply system provided by the invention, the input end of the inverter is connected with the filter capacitor in parallel;
according to the non-contact power supply system provided by the invention, the input end of the transmitting cable is connected with the compensation capacitor in a mode of combining series connection and parallel connection.
According to the non-contact power supply system provided by the invention, the electric energy emission subsystem further comprises a transformer, and the transformer is matched with the inverter for use.
The invention also provides a hanging train, comprising:
the non-contact power supply system is characterized in that the non-contact power supply system comprises a power supply circuit.
According to the non-contact power supply system and the hanging train, the plurality of inverters are arranged, the plurality of output interfaces are arranged for each inverter, and the plurality of output interfaces are connected with the plurality of access ends of the transmitting cable, so that the power consumption requirement of the hanging train can be met, and the problem of unbalanced load among the plurality of inverters is solved.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a contactless power supply system according to the present invention;
FIG. 2 is a topology diagram of an inverter employed in one embodiment of the invention;
FIG. 3 is a schematic diagram illustrating a connection relationship between an inverter and a transmitting cable according to an embodiment of the present invention;
FIG. 4 is a schematic view of a pickup device according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of the structure of the compensation capacitor in the pick-up device according to one embodiment of the present invention;
FIG. 6 is a schematic diagram of the configuration of compensation capacitors in a transmit cable according to one embodiment of the present invention;
fig. 7 is a schematic diagram of an embodiment of a contactless power supply system of the present invention.
Reference numerals:
10 electric energy transmitting subsystem 11 vehicle-mounted electric energy receiving subsystem
12 power supply 101 inverter
102 transmit cable 103 compensation capacitance
111 pick-up 112 rectifier
113 energy storage device 1011 inverter output interface
1012 inverter input interface 1111 magnetic core
1112 coil 1113 supplements the capacitance
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The noncontact power supply system and the hanging train of the present invention are described below with reference to fig. 1 to 6.
Fig. 1 is a schematic structural diagram of a non-contact power supply system provided by the present invention, as shown in fig. 1, the non-contact power supply system provided by the present invention includes: a power transmitting subsystem 10 and a vehicle-mounted power receiving subsystem 11; wherein the power transmission subsystem 10 includes an inverter 101, and a transmission cable 102; the in-vehicle power receiving subsystem 11 includes a pickup 111, a rectifier 112, and an energy storage 113. Wherein the transmitting cable 102 is a multi-turn parallel winding structure; the number of the inverters 101 is plural, each inverter 101 has a plurality of output interfaces, and the plurality of output interfaces of each inverter 101 are respectively connected with a plurality of cable access ends in the transmitting cable 102.
The inverter 101 converts externally-connected direct current into alternating current and then transmits the alternating current to the transmitting cable 102, and the transmitting cable 102 generates an alternating magnetic field based on the alternating current.
The pick-up device 111 converts the alternating magnetic field generated by the transmitting cable 102 into alternating current by means of magnetic field coupling, and then said alternating current is converted into direct current by said rectifier 112, which is finally stored in the energy storage device 113.
The following describes the parts of the contactless power supply system further.
The inverter 101 is configured to convert direct current into alternating current. The operating frequency of the inverter 101 is not lower than 20kHz based on the power demand of the on-train. In this embodiment, siC power devices may be used. The SiC power device has a wider forbidden band, can work at a higher frequency, and has smaller power loss.
The non-contact power supply system is applied to a hanging train, and the power requirement of the hanging train is generally more than 600kW and is larger than the rated power of a single high-power high-frequency inverter in the prior art. In this embodiment, therefore, the power transmission subsystem 10 is provided with a plurality of inverters 101 that combine to supply power to the on-train. This both meets the power demand of the on-hook train and allows the load of the single inverter to not exceed its rated power.
Fig. 2 is a topological structure diagram of an inverter used in the present embodiment, and as shown in fig. 2, the inverter has a full bridge structure.
Assuming Uin as the external supply input voltage of the single inverter and Uout as the output voltage of the single inverter, the relationship between the output voltage and the input voltage can be expressed as:
the transmission cable 102 is used to convert an input high-frequency alternating current into a high-frequency alternating magnetic field. Wherein, the high frequency refers to the frequency not lower than 20kHz.
In order to reduce the loss, in the present embodiment, the transmission cable 102 employs a high-frequency litz cable.
To reduce the cost and make the structure compact, in this embodiment, the transmitting cable 102 is a cable having a non-magnetic core structure.
To achieve a relatively uniform launch/pick-up spatial magnetic field distribution, and to improve train vibration suppression, the launch cable 102 may be a multi-cable shunt structure.
When the transmitting cable 102 is of a multi-cable parallel winding structure, in order to suppress the problem of load imbalance among a plurality of inverters, each inverter needs to supply power to a plurality of cables in the transmitting cable 102 at the same time, that is, each inverter is provided with a plurality of output interfaces, which are connected with a plurality of access terminals in the transmitting cable, so that one inverter can supply power to a plurality of cables in the transmitting cable at the same time, and one cable in the transmitting cable is supplied with power from a plurality of inverters at the same time.
Fig. 3 is a schematic diagram illustrating a connection relationship between an inverter and a transmitting cable according to an embodiment of the present invention. As shown in fig. 3, in this embodiment, there are a plurality of inverters 101, and an input interface 1012 of each inverter 101 is connected to an external power source 12; each inverter 101 is divided into a plurality of output interfaces 1011, and each output interface 1011 is connected to a transmission cable 102 via a compensation capacitor 103.
The pick-up device 111 is used for coupling the alternating magnetic field generated by the transmitting cable 102 and receiving the electric energy.
Fig. 4 is a schematic structural diagram of a pickup device according to an embodiment of the present invention, and as shown in fig. 4, the pickup device 111 includes a foam board (not shown), a magnetic core 1111, a coil 1112, and a compensation capacitor 1113. The magnetic core is placed on the foam board, the coil is arranged on the magnetic core, and the compensation capacitor is connected with the coil in series.
In this embodiment, the foam board is used at the bottom of the pickup 111 to help reduce the impact of vibrations generated during train operation on the pickup.
As a preferred implementation, the magnetic core has a plurality of single pieces, and each single piece is spliced into a double-U-shaped structure in an equidistant manner, and the double-U-shaped structure is placed on the foam board.
For example, a plurality of mounting holes are bored in the foam board in an equally spaced manner, and the respective cores are individually placed in these mounting holes. All magnetic core singlechips form a double U-shaped structure after being installed. On one hand, the method is effective in inhibiting the influence of high-frequency magnetic field leakage on nearby in-vehicle equipment, improving the reliability of a magnetic circuit system, guaranteeing the transmission efficiency, and on the other hand, guaranteeing the requirement of a narrow space on size constraint and reducing the weight.
Fig. 5 is a schematic structural diagram of a compensation capacitor in a pickup device according to an embodiment of the present invention. As shown in fig. 5, the compensation capacitor includes a voltage suppressor. The voltage suppressor is located at the output end of the pick-up device 111, and the voltage suppressor can be used for reactive power generated by the pick-up device to ensure the safety of the back-end electrical equipment.
In this embodiment, there may be a plurality of pickup devices 111, which are mutually inductance with the transmission cable 102, respectively. Assuming that there are n pickup devices in the in-vehicle power receiving subsystem 11, the expression of the induced voltage of the i-th pickup device is:
U 2i ＝2×π×f×M 2i ×I 1 。
wherein U is 2i An induced voltage for the i-th pickup device; f is the operating frequency (where operating frequency refers to the rated operating frequency of the inverter, compensation capacitor, transmitting cable, pickup device, vehicle rectifier, etc., all operating near the same frequency); m is M 2i Is the mutual inductance between the ith pick-up device and the transmitting cable; i 1 To transmit the total current of the cable.
The rectifier 112 is used to convert the alternating current received by the pickup 111 into direct current.
In this embodiment, the rectifier 112 may employ SiC power devices. The voltage conversion formula of the rectifier 112 is:
where Uri represents the output voltage of the ith rectifier, U 2i Is the induced voltage of the i-th pickup device.
The number of rectifiers 112 may be one or more, and when there are a plurality of pickup devices 111, there are a plurality of rectifiers 112 so that one pickup device 111 can be used with one rectifier 112.
The energy storage device 113 is used for realizing conversion of the direct current voltage value and storage of the direct current.
In this embodiment, the energy storage device 113 is a DC/DC energy storage device, and the DC/DC energy storage device converts the direct current output by the rectifier 112 into a direct current with a preset voltage and stores the direct current. Assuming Uo is the voltage of the converted direct current, i.e. the output voltage of the contactless power supply system, the corresponding conversion formula is:
Uo＝Uri/(1-D)；
where Uri denotes the output voltage of the i-th rectifier and D is the duty cycle.
The energy storage device 113 may be one or more. When there are a plurality of energy storage devices 113, one energy storage device may receive and store the output current of the corresponding rectifier; when the number of energy storage devices 113 is less than the number of rectifiers 112 (e.g., only one energy storage device is provided), one energy storage device may receive and store the output currents of a plurality of rectifiers.
According to the non-contact power supply system provided by the invention, the plurality of inverters are arranged, the plurality of output interfaces are arranged for each inverter, and the plurality of output interfaces are connected with the plurality of access ends of the transmitting cable, so that the power consumption requirement of a hanging train can be met, and the problem of unbalanced load among the plurality of inverters is solved.
Based on any of the above embodiments, in this embodiment, the input terminal of the inverter 101 is connected in parallel with a filter capacitor.
Based on any of the above embodiments, in this embodiment, the input end of the transmitting cable 102 is also connected with a compensation capacitor.
Fig. 6 is a schematic diagram of the structure of the compensation capacitor in the transmitting cable according to an embodiment of the present invention. As shown in fig. 6, a compensation capacitor is connected to the input end of the transmitting cable 102, and the compensation capacitor can compensate reactive power generated by the transmitting cable 102 to suppress overvoltage.
The non-contact power supply system provided by the invention is provided with the compensation capacitor for the transmitting cable, so that reactive power generated by the transmitting cable can be compensated, overvoltage is restrained, and the safety of electrical equipment is ensured.
Based on any of the above embodiments, in this embodiment, the power transmission subsystem 10 further includes a transformer, and the transformer is used in combination with the inverter.
In this embodiment, the transformer is used to achieve impedance matching. Specifically, the transformer can be connected with the inverter, and the output voltage of the inverter is regulated by the transformer and is loaded on the transmitting cable.
The implementation of the transformer is common knowledge to a person skilled in the art and is not further described in this embodiment.
The non-contact power supply system provided by the invention can realize the matching of voltage and current parameters among an external input power supply, the inverter and a transmitting cable by arranging the transformer for the inverter, thereby enhancing the system efficiency and reducing the complexity of the system.
The noncontact power supply system of the present invention will be fully described with reference to the following examples.
Fig. 7 is a schematic diagram of an embodiment of a contactless power supply system of the present invention. In this embodiment, the non-contact power supply system of the invention is applied to a hanging train, and the power requirement of the hanging train is generally more than 600kW and is larger than the rated power of a single high-power high-frequency inverter in the prior art. Thus, in the embodiment shown in fig. 7, the power transmission subsystem 10 includes a plurality of inverters 101.
Specifically, the power transmission subsystem 10 in fig. 7 includes n inverters, which may be represented by the reference signs UI 1-UIn in order. The n inverters are connected in parallel to an external power supply, and the voltage of the external power supply is represented by Ui. One inverter is used in combination with one transformer, as shown in fig. 7, the inverter UI1 is used in combination with the transformer Mt1, and similarly, the inverter UIx is used in combination with the transformer Mtx (x.ltoreq.n). n transformers are then connected in parallel to the transmit cable 102.
In the power transmission subsystem 10 shown in fig. 7, there is one output control switch on each inverter, and K01 to K0n denote the output control switches on the inverters UI1 to UIn, respectively. The input end of each inverter is also connected with a filter capacitor in parallel, and Ci 1-Cin are used for respectively representing the filter capacitors of the input ends of the inverters UI 1-UIn. A compensation capacitor is also connected to the output end of each transformer (i.e. the input end of the cable), and the compensation capacitors connected to the output ends of the transformers Mt1 to Mtn are respectively represented by C1/Cp1 to Cn/Cpn. The compensation capacitor is used to suppress the overvoltage of the transmission cable 102. The equivalent inductance of the transmit cable 102 is also denoted by L1 in fig. 7.
In the embodiment, the power output by the whole non-contact power supply system can meet the power requirement of the hanging train by arranging the plurality of inverters and the transformers matched with the inverters, and the power requirement is not limited by the rated power range of a single inverter.
In the embodiment shown in fig. 7, the vehicle-mounted power receiving subsystem 11 includes a plurality of pickup devices 111 and a plurality of rectifiers 112, corresponding to the power transmitting subsystem 10. A pickup device is used in conjunction with a rectifier.
Specifically, the in-vehicle power receiving subsystem 11 in fig. 7 includes n pickup devices P1 to Pn, each of which is mutually inductive with the transmission cable 102. The mutual inductance between the n pick-up devices and the transmitting cable may be represented sequentially by the marks M1 to Mn. L21 to L2n can be used to represent the equivalent inductances of the n pickup devices, respectively. A pick-up device is used in conjunction with a rectifier, as shown in fig. 7, pick-up device P1 is used in conjunction with rectifier Ur1, and similarly pick-up device Px is used in conjunction with rectifier Urx (x n). Each of the n rectifiers is connected to an energy storage device.
The n pick-up devices are respectively provided with compensation capacitors, and C21-C2 n can be used for representing the compensation capacitors on the pick-up devices P1-Pn respectively; the filter inductor and the filter capacitor are arranged on the connecting circuit of the rectifier and the energy storage device, lo 1-Lon can be used for respectively representing the filter inductor on the connecting circuit between the rectifier Ur1 and the energy storage device and the filter inductor on the connecting circuit between the rectifier Urn and the energy storage device, and Co 1-Con can be used for respectively representing the filter capacitor on the connecting circuit between the rectifier Ur1 and the energy storage device and the filter inductor on the connecting circuit between the rectifier Urn and the energy storage device. The output voltages of the n energy storage devices are denoted Uo1 to Uon. Uo represents the output voltage of the entire contactless power supply system, uo=uo1= … … = Uon; uo=ui in general.
In this embodiment, the relational expression between the output voltage and the input voltage of the contactless power supply system is:
wherein U is o Representing the output voltage of the contactless power supply system,U i representing an input voltage of the contactless power supply system; n is the transformer transformation ratio; d is the duty cycle of the DC/DC energy storage device; ω is the electrical angular frequency, ω=2pi f; m is the mutual inductance average value between each pick-up device and the transmitting cable; l1 is the self-inductance of the transmitting cable.
By appropriate design of the system-related parameters, the train supply demand Uo in the case of the input voltage Ui can be achieved.
Based on any one of the foregoing embodiments, in another embodiment, the present invention further provides a hanging train, including:
the contactless power supply system described in the previous embodiment.
In the embodiment, when the non-contact power supply system is installed in a hanging train, the pick-up device outputs alternating current, which is rectified by a rectifier and converted into direct current of 750 v/1500 v DC by a DC/DC energy storage device, and then connected to a high-voltage equipment box of the train
Compared with the power supply rail sliding contact power supply mode in the prior art, the hanging train provided by the invention has the advantages that the current receiving system is not needed, so that daily maintenance work can be reduced, and the running and maintenance cost is reduced.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. A contactless power supply system, characterized by comprising: the power transmitting subsystem and the vehicle-mounted power receiving subsystem are connected with each other through a power transmission network;
the electric energy transmitting subsystem comprises an inverter and a transmitting cable; wherein the transmitting cable is of a multi-turn parallel winding structure; the plurality of inverters are provided, each inverter is provided with a plurality of output interfaces, and the plurality of output interfaces of each inverter are respectively connected with a plurality of access terminals in the transmitting cable; the vehicle-mounted electric energy receiving subsystem comprises a pickup device, a rectifier and an energy storage device;
the inverter converts externally-accessed direct current into alternating current and then transmits the alternating current to the transmitting cable, and the transmitting cable generates an alternating magnetic field based on the alternating current;
the pick-up device converts the alternating magnetic field into alternating current through magnetic field coupling, and then the alternating current is converted into direct current by the rectifier, and the direct current is stored in the energy storage device;
the pick-up device comprises a foam board, a magnetic core, a coil and a compensation capacitor; wherein, the liquid crystal display device comprises a liquid crystal display device,
the magnetic core is arranged on the foam board, the coil is arranged on the magnetic core, and the compensation capacitor is connected with the coil in a serial manner;
the magnetic core has a plurality of singlechips, and each singlechip splices into double U type structure with equidistant mode, double U type structure place in on the foam board, it has a plurality of mounting holes to excavate with equidistant mode on the foam board, and each singlechip is placed in the mounting hole.
2. The contactless power supply system according to claim 1, wherein an operating frequency of the inverter is not lower than 20kHz.
3. The contactless power supply system according to claim 1, wherein the energy storage device is a DC/DC energy storage device that converts the direct current output from the rectifier into a direct current of a predetermined voltage and stores the direct current.
4. The contactless power supply system of claim 1 wherein the input of the inverter is connected in parallel with a filter capacitor.
5. The contactless power supply system according to claim 1, wherein the input end of the transmitting cable is connected with a compensation capacitor in a combination of series and parallel.
6. The contactless power supply system of any one of claims 1-5 wherein the power-emitting subsystem further comprises a transformer, the transformer being used in conjunction with the inverter.
7. A hanging train, comprising:
the contactless power supply system of any one of claims 1 to 6.
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| CN101093964A (en) * | 2007-07-13 | 2007-12-26 | 上海闵行电力实业有限公司 | Large power inverter circuit with multiple electrical levels of magnetic suspended train |
| CN102035417A (en) * | 2009-10-01 | 2011-04-27 | 邓加慧 | Signal output circuit working in magnetic core saturation region |
| CN102358197B (en) * | 2011-08-06 | 2014-03-26 | 深圳市英威腾交通技术有限公司 | Power supply system for electric locomotive |
| FR3031849B1 (en) * | 2015-01-16 | 2017-02-17 | Alstom Transp Tech | POWER SUPPLY CONVERTER AND / OR SUBSTATION FOR RECOVERING BRAKING ENERGY |
| CN108599401A (en) * | 2018-07-10 | 2018-09-28 | 中惠创智无线供电技术有限公司 | A kind of track wireless power supply |
| CN110789544B (en) * | 2018-08-03 | 2020-12-11 | 中车株洲电力机车研究所有限公司 | Energy storage type vehicle non-contact power supply system and method |
| CN109193960B (en) * | 2018-10-08 | 2021-02-09 | 中车青岛四方机车车辆股份有限公司 | Non-contact power supply system transmitting terminal unit and non-contact power supply system transmitting terminal |
| JP2020088896A (en) * | 2018-11-15 | 2020-06-04 | 株式会社ダイヘン | Capacitor unit |
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| CN105119390A (en) * | 2015-09-23 | 2015-12-02 | 常州机电职业技术学院 | Non-contact type electricity obtaining system and operating method thereof, and truss robot |
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