CN113103928A - Automatic passing neutral section system, wireless electric energy transmitting and receiving device - Google Patents
Automatic passing neutral section system, wireless electric energy transmitting and receiving device Download PDFInfo
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- CN113103928A CN113103928A CN202110578457.0A CN202110578457A CN113103928A CN 113103928 A CN113103928 A CN 113103928A CN 202110578457 A CN202110578457 A CN 202110578457A CN 113103928 A CN113103928 A CN 113103928A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M3/00—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power
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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
- B60L53/10—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 characterised by the energy transfer between the charging station and the vehicle
- B60L53/12—Inductive energy transfer
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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
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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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
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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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
- 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
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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
- 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
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
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- Electric Propulsion And Braking For Vehicles (AREA)
- Current-Collector Devices For Electrically Propelled Vehicles (AREA)
Abstract
The invention discloses an automatic neutral section passing system based on wireless power transmission, which comprises a wireless power transmitting device arranged on the ground where a train runs in an electric neutral section and a wireless power receiving device arranged on the train. The wireless electric energy transmitting device is used for transmitting wireless electric energy; the wireless electric energy receiving device is used for converting wireless electric energy into direct current to be supplied to a middle direct current loop of the vehicle-mounted converter after receiving the wireless electric energy, so that electric energy required by the train to run in the electric phase splitting section is provided for the train. Therefore, when the train passes through the electric phase separation section, the wireless electric energy transmitting and receiving device is used for providing a new energy transmission channel for the train, and uninterrupted power supply of the train in the electric phase separation section is achieved, so that the traction force of the train is kept stable, and the stability of the train and the comfort level of passengers are improved. The invention also discloses a wireless electric energy transmitting device and a wireless electric energy receiving device, which have the same beneficial effects as the passing neutral section system.
Description
Technical Field
The invention relates to the field of wireless power transmission, in particular to an automatic passing neutral section system and a wireless power transmitting and receiving device.
Background
At present, most of electrified railways adopt an alternating current power supply system. Referring to fig. 1, fig. 1 is a schematic diagram of an ac power supply system provided in the prior art. In fig. 1, the power system provides a 110kV/220kV/330kV high voltage power supply, which generally has a large capacity and can withstand large short-circuit current and harmonic current. The traction transformer finishes the conversion from three-phase high-voltage alternating current to secondary-side two-phase low-voltage alternating current, the secondary side of the traction transformer utilizes a feeder line to connect 25kV voltage to a contact network, the 25kV voltage is connected into a train through a contact network lead and a pantograph to supply power for the train, and a complete loop is formed by a steel rail and a return line which run through the train.
In an ac power supply system, the voltage amplitudes and phases of two adjacent power supply arms under the same traction transformer are different, as shown in fig. 1, a power supply arm α 1 and a power supply arm β 1, and a power supply arm α 2 and a power supply arm β 2. In addition, due to factors such as dispersion of parameters of the traction transformer, inconsistency of lengths of overhead lines, inconsistency of current taking of trains and the like, the voltage amplitudes and phases of two adjacent power supply arms under adjacent traction transformers are different, such as a power supply arm β 1 and a power supply arm α 2 in fig. 1. In this case, an electrical phase separator (i.e., an insulator is used to separate each phase of the catenary) must be disposed between two adjacent power supply arms under the same traction transformer and between two adjacent power supply arms under the adjacent traction transformers, otherwise, an inter-phase short circuit may be caused. However, the electric phase separation section does not have electricity, and the problem of unstable train traction force exists when the train passes through the electric phase separation section, so that the stability of the train and the comfort of passengers are reduced.
Therefore, how to provide a solution to the above technical problem is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide an automatic neutral section passing system and a wireless electric energy transmitting and receiving device, when a train passes through an electric neutral section, a new energy transmission channel is provided for the train by using the wireless electric energy transmitting and receiving device, and the uninterrupted power supply of the train in the electric neutral section is realized, so that the traction of the train is kept stable, and the stability of the train and the comfort of passengers are improved.
In order to solve the above technical problem, the present invention provides an automatic passing neutral section system based on wireless power transmission, comprising:
the wireless electric energy transmitting device is arranged on the ground where the train runs in the electric phase separation section and is used for transmitting wireless electric energy;
and the wireless electric energy receiving device is arranged on the train and used for converting the wireless electric energy into direct current to be supplied to a middle direct current path of the vehicle-mounted converter after receiving the wireless electric energy so as to provide the train with electric energy required by the train running in an electric phase splitting section.
Preferably, the wireless power transmitting apparatus includes:
a ground coil;
the first power conversion circuit is connected with the alternating current power supply system and the ground coil respectively and used for converting alternating current output by the alternating current power supply system into first direct current and transmitting the first direct current into a high-frequency magnetic field by the ground coil.
Preferably, the wireless power receiving apparatus includes:
the vehicle-mounted coil is used for converting the received high-frequency magnetic field into second direct current;
and the second power supply conversion circuit is respectively connected with the vehicle-mounted coil and the intermediate direct current loop of the vehicle-mounted converter and is used for converting the second direct current into direct current for the intermediate direct current loop.
Preferably, the first power conversion circuit includes:
the AC/DC circuit is connected with the alternating current power supply system and is used for converting alternating current output by the alternating current power supply system into direct current to be output;
and the DC/DC circuit is respectively connected with the AC/DC circuit and the ground coil and is used for converting the direct current output by the AC/DC circuit into a first direct current and converting the first direct current into a high-frequency magnetic field through the ground coil to be emitted.
Preferably, the alternating current power supply system is a three-phase alternating current power supply system or a single-phase alternating current power supply system.
Preferably, the second power conversion circuit is a DC/DC circuit.
Preferably, the ground coils are laid on the ground where the train runs in the electric phase separation section at equal intervals; the vehicle-mounted coils are laid at the bottom of the train at equal intervals.
Preferably, the ground coil and the vehicle-mounted coil are wound in a D-type, V-type, E-type or S-type coil winding mode.
Preferably, the second power conversion circuit is further configured to convert braking electric energy returned to the intermediate dc loop by the train during braking in the electrically isolated phase section into a third dc power, and convert the third dc power into a high-frequency magnetic field through the on-board coil to be emitted;
the ground coil is also used for converting the received high-frequency magnetic field into fourth direct current;
the first power conversion circuit is further configured to convert the fourth direct current into an alternating current and send the alternating current back to the alternating current power system.
Preferably, the electric phase separation section through which the train passes adopts a single air partition area with a partition distance smaller than a preset distance to realize electric phase separation.
In order to solve the above technical problem, the present invention further provides a wireless power transmitting apparatus, which is applied to any one of the above automatic passing neutral section systems based on wireless power transmission, and includes:
a ground coil;
the first power conversion circuit is connected with the alternating current power supply system and the ground coil respectively and used for converting alternating current output by the alternating current power supply system into first direct current and transmitting the first direct current into a high-frequency magnetic field by the ground coil.
Preferably, the first power conversion circuit includes:
the AC/DC circuit is connected with the alternating current power supply system and is used for converting alternating current output by the alternating current power supply system into direct current to be output;
and the DC/DC circuit is respectively connected with the AC/DC circuit and the ground coil and is used for converting the direct current output by the AC/DC circuit into a first direct current and converting the first direct current into a high-frequency magnetic field through the ground coil to be emitted.
Preferably, the AC/DC circuit and the DC/DC circuit are both bidirectional power conversion circuits.
In order to solve the above technical problem, the present invention further provides a wireless power receiving apparatus, which is applied to any one of the above automatic neutral section passing systems based on wireless power transmission, and includes:
the vehicle-mounted coil is used for receiving the high-frequency magnetic field transmitted by the wireless power transmitting device and converting the high-frequency magnetic field into second direct current;
and the second power supply conversion circuit is respectively connected with the vehicle-mounted coil and the intermediate direct current loop of the vehicle-mounted converter and is used for converting the second direct current into direct current for the intermediate direct current loop.
Preferably, the second power conversion circuit is a bidirectional DC/DC circuit.
The invention provides an automatic neutral section passing system based on wireless power transmission, which comprises a wireless power transmitting device arranged on the ground where a train runs in an electric neutral section and a wireless power receiving device arranged on the train. The wireless electric energy transmitting device is used for transmitting wireless electric energy; the wireless electric energy receiving device is used for converting wireless electric energy into direct current to be supplied to a middle direct current loop of the vehicle-mounted converter after receiving the wireless electric energy, so that electric energy required by the train to run in the electric phase splitting section is provided for the train. Therefore, when the train passes through the electric phase separation section, the wireless electric energy transmitting and receiving device is used for providing a new energy transmission channel for the train, and uninterrupted power supply of the train in the electric phase separation section is achieved, so that the traction force of the train is kept stable, and the stability of the train and the comfort level of passengers are improved.
The invention also provides a wireless electric energy transmitting device and a wireless electric energy receiving device, which have the same beneficial effects as the passing neutral section system.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic diagram of an ac power supply system provided in the prior art;
fig. 2 is a schematic structural diagram of an automatic neutral section passing system based on wireless power transmission according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a wireless power transmitting apparatus according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a wireless power receiving apparatus according to an embodiment of the present invention;
fig. 5 is a schematic diagram of electrical connections of a conventional electrical phase splitter according to an embodiment of the present invention.
Detailed Description
The core of the invention is to provide an automatic neutral section passing system and a wireless electric energy transmitting and receiving device, when a train passes through an electric neutral section, the wireless electric energy transmitting and receiving device is used for providing a new energy transmission channel for the train, thereby realizing the uninterrupted power supply of the train in the electric neutral section, keeping the traction of the train stable, and improving the stability of the train and the comfort of passengers.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 2, fig. 2 is a schematic structural diagram of an automatic passing neutral section system based on wireless power transmission according to an embodiment of the present invention.
The automatic passing neutral section system based on wireless power transmission comprises:
the wireless power transmitting device 1 is arranged on the ground where the train runs in the electric phase separation section and is used for transmitting wireless power;
and the wireless power receiving device 2 is arranged on the train and used for converting the wireless power into direct current to be supplied to a middle direct current loop of the vehicle-mounted converter after receiving the wireless power so as to provide the train with the power required by the train to run in the electric phase splitting section.
Specifically, the wireless power transmission-based automatic neutral section passing system of the present application includes a wireless power transmitting device 1 and a wireless power receiving device 2, and the working principle thereof is as follows:
when the train power supply system is an alternating current power supply system, the alternating current power supply system comprises a pantograph, a step-down transformer, a grid-side converter, a machine-side converter and the like which are sequentially connected (the grid-side converter and the machine-side converter are collectively called as a vehicle-mounted converter, and a power supply loop connected between the grid-side converter and the machine-side converter is a middle direct current loop of the vehicle-mounted converter). The pantograph is used for guiding alternating current electric energy on a contact net to a train; the step-down transformer is used for carrying out step-down and electrical isolation treatment on the alternating current electric energy guided by the pantograph; the grid-side converter is used for rectifying the alternating current electric energy output by the step-down transformer into direct current electric energy and supplying the direct current electric energy to the intermediate direct current power supply loop; the intermediate direct current power supply loop is used for finishing functions of filtering, energy buffering and the like; and the machine side converter is used for inverting the direct current electric energy transmitted on the middle direct current power supply loop into alternating current electric energy so as to supply the alternating current electric energy to a train motor for use, thereby completing the functions of starting and stopping, speed control and the like of the train driving motor.
The wireless electric energy transmitting device 1 is arranged on the ground where the train runs in the electric phase splitting section, and the wireless electric energy transmitting device 1 can transmit wireless electric energy. The wireless power receiving device 2 is arranged on the train, and it can be understood that when the train runs in the electric phase separation section, the wireless power receiving device 2 can receive the wireless power transmitted by the wireless power transmitting device 1, and after receiving the wireless power transmitted by the wireless power transmitting device 1, the wireless power receiving device 2 converts the received wireless power into direct current to be supplied to the intermediate direct current circuit of the vehicle-mounted converter, so as to provide the train with the power required by the train running in the electric phase separation section.
The invention provides an automatic neutral section passing system based on wireless power transmission, which comprises a wireless power transmitting device arranged on the ground where a train runs in an electric neutral section and a wireless power receiving device arranged on the train. The wireless electric energy transmitting device is used for transmitting wireless electric energy; the wireless electric energy receiving device is used for converting wireless electric energy into direct current to be supplied to a middle direct current loop of the vehicle-mounted converter after receiving the wireless electric energy, so that electric energy required by the train to run in the electric phase splitting section is provided for the train. Therefore, when the train passes through the electric phase separation section, the wireless electric energy transmitting and receiving device is used for providing a new energy transmission channel for the train, and uninterrupted power supply of the train in the electric phase separation section is achieved, so that the traction force of the train is kept stable, and the stability of the train and the comfort level of passengers are improved.
On the basis of the above-described embodiment:
referring to fig. 3 and 4, fig. 3 is a schematic structural diagram of a wireless power transmitting apparatus according to an embodiment of the present invention; fig. 4 is a schematic structural diagram of a wireless power receiving apparatus according to an embodiment of the present invention.
As an alternative embodiment, the wireless power transmission apparatus 1 includes:
ground coil L1;
and the first power supply conversion circuit is respectively connected with the alternating current power supply system and the ground coil L1 and is used for converting alternating current output by the alternating current power supply system into first direct current and converting the first direct current into a high-frequency magnetic field through the ground coil L1 to be emitted.
Specifically, the wireless power transmitting apparatus 1 of the present application includes a ground coil L1 and a first power conversion circuit, and its operating principle is:
the first power transmission end of the first power conversion circuit is connected with the alternating current power supply system and used for receiving alternating current (usually alternating current with 50Hz power frequency) output by the alternating current power supply system and converting the alternating current output by the alternating current power supply system into first direct current. The second power transmission end of the first power conversion circuit is connected to the ground coil L1, and is configured to output the converted first direct current to the ground coil L1, so as to convert the first direct current into a high-frequency magnetic field (the high-frequency magnetic field refers to an electromagnetic wave with a frequency of 100kHz to 300MHz, and the wavelength range of the electromagnetic wave is emitted from 1 to 3000 m) through the ground coil L1, and the high-frequency magnetic field is emitted, so that the wireless power receiving device 2 can receive and utilize magnetic field energy.
As an alternative embodiment, the radio energy receiving apparatus 2 includes:
a vehicle-mounted coil L2 for converting the received high-frequency magnetic field into a second direct current;
and the second power conversion circuit is respectively connected with the vehicle-mounted coil L2 and the intermediate direct current loop of the vehicle-mounted converter and is used for converting the second direct current into direct current for the intermediate direct current loop.
Specifically, the radio energy receiving apparatus 2 of the present application includes an in-vehicle coil L2 and a second power conversion circuit, and its operating principle is:
when the train travels in the electric phase separation section, it is understood that the on-board coil L2 may receive the high-frequency magnetic field transmitted from the ground coil L1 and convert the received high-frequency magnetic field into the second direct current. The vehicle-mounted coil L2 is connected to the first power transmission end of the second power conversion circuit, and is configured to output the converted second direct current to the second power conversion circuit. And a second electric transmission end of the second power supply conversion circuit is connected with the intermediate direct current loop of the vehicle-mounted converter and is used for converting the received second direct current into direct current for the intermediate direct current loop and outputting the converted direct current to the intermediate direct current loop so as to provide electric energy required by the train to run in the electric phase splitting section.
It should be noted that the train does not need to perform position detection of the electric phase separation section, and the on-vehicle coil L2 can automatically detect the high-frequency magnetic field transmitted by the ground coil L1 when the train reaches the coil position corresponding to the electric phase separation section.
As an alternative embodiment, the first power conversion circuit includes:
the AC/DC circuit is connected with the AC power supply system and is used for converting the AC output by the AC power supply system into DC output;
and the DC/DC circuit is respectively connected with the AC/DC circuit and the ground coil L1 and is used for converting the direct current output by the AC/DC circuit into a first direct current and converting the first direct current into a high-frequency magnetic field through the ground coil L1 to be emitted.
Specifically, the first power conversion circuit of the present application includes an AC/DC (alternating current/direct current) circuit and a DC/DC (direct current/direct current) circuit, and its operation principle is:
the alternating current transmission end of the AC/DC circuit is used as a first electric transmission end of the first power conversion circuit and connected with the alternating current power supply system, and is used for receiving alternating current output by the alternating current power supply system and converting the alternating current output by the alternating current power supply system into direct current for output. The first direct current transmission end of the DC/DC circuit is connected with the direct current transmission end of the AC/DC circuit and used for converting the direct current output by the AC/DC circuit into a first direct current. The second direct current transmission end of the DC/DC circuit is connected to the ground coil L1 as the second electric transmission end of the first power conversion circuit, and is used for outputting the first direct current converted by itself to the ground coil L1, so as to convert the first direct current into a high-frequency magnetic field through the ground coil L1 and emit the high-frequency magnetic field.
As an alternative embodiment, the ac power supply system is a three-phase ac power supply system or a single-phase ac power supply system.
Specifically, the ac power supply system of the present application may be a three-phase ac power supply system, or may be a single-phase ac power supply system, and the present application is not limited thereto.
As an alternative embodiment, the second power conversion circuit is a DC/DC circuit.
Specifically, the second power conversion circuit of the present application selects a DC/DC circuit, and its operating principle is:
when the train travels in the electric phase separation section, the on-board coil L2 can convert the high-frequency magnetic field emitted from the ground coil L1 into a second direct current. The first direct current transmission end of the DC/DC circuit is used as the first electric transmission end of the second power conversion circuit to be connected with the vehicle-mounted coil L2, and the second direct current transmission end of the DC/DC circuit is used as the second electric transmission end of the second power conversion circuit to be connected with the intermediate direct current loop of the vehicle-mounted converter, and is used for receiving the second direct current converted by the vehicle-mounted coil L2 and converting the received second direct current into direct current for the intermediate direct current loop to use.
As an alternative embodiment, the ground coils L1 are laid on the ground where the train runs in the electric phase separation section at equal intervals; the vehicle coils L2 are laid at equal intervals on the bottom of the train.
Specifically, the wireless power transmitting apparatus 1: the DC transmission terminals of the AC/DC circuits are respectively connected to the first DC transmission terminals of the plurality of DC/DC circuits, and the second DC transmission terminals of the plurality of DC/DC circuits are connected to the plurality of ground coils L1 one by one, as shown in fig. 3. The ground coils L1 are laid on the ground where the train travels in the electric phase separation section at equal intervals.
Wireless power reception device 2: the plurality of vehicle-mounted coils L2 are connected to the first direct-current transmission terminals of the plurality of DC/DC circuits one by one, and the second direct-current transmission terminals of the plurality of DC/DC circuits are each connected to the intermediate direct-current circuit, as shown in fig. 4. The plurality of on-vehicle coils L2 are laid at equal intervals on the bottom of the train.
The ground coil L1 and the vehicle-mounted coil L2 may be laid at equal intervals, and other laying methods may be used.
As an alternative embodiment, the ground coil L1 and the vehicle coil L2 are wound in a D-type, V-type, E-type, or S-type coil winding manner.
Specifically, the ground coil L1 and the vehicle coil L2 of the present application may be wound by a D-type coil winding method, a V-type coil winding method, an E-type coil winding method, or an S-type coil winding method, which is not particularly limited herein.
As an alternative embodiment, the second power conversion circuit is further configured to convert braking electric energy returned to the intermediate dc loop by the train during braking of the electrically split phase section into a third dc power, and convert the third dc power into a high-frequency magnetic field via the onboard coil L2 for emission;
the ground coil L1 is also used for converting the received high-frequency magnetic field into fourth direct current;
the first power conversion circuit is also used for converting the fourth direct current into alternating current and sending the alternating current back to the alternating current power system.
Specifically, when the train is in a braking condition, the machine side converter is used for rectifying alternating current electric energy generated by braking of a train motor into direct current electric energy and returning the direct current electric energy to the intermediate direct current loop. Based on this, the second power conversion circuit and the first power conversion circuit are both bidirectional power conversion circuits, so that when the train brakes in the electric phase splitting section, the second power conversion circuit converts the braking electric energy returned to the middle direct current loop when the train brakes in the electric phase splitting section into third direct current, and the third direct current is converted into a high-frequency magnetic field through the vehicle-mounted coil L2 and is emitted; the ground coil L1 can receive the high-frequency magnetic field emitted by the vehicle-mounted coil L2, convert the received high-frequency magnetic field into fourth direct current and output the fourth direct current to the first power conversion circuit; the first power supply conversion circuit converts the received fourth direct current into alternating current and sends the alternating current back to the alternating current power supply system, and therefore the train can smoothly pass through the electric split-phase section under the braking working condition.
Based on fig. 3 and 4, the AC/DC circuit in the wireless power transmitting apparatus 1 is a bidirectional AC/DC circuit, and each of the plurality of DC/DC circuits is a bidirectional DC/DC circuit. A plurality of DC/DC circuits in the wireless power receiving device 2 are all bidirectional DC/DC circuits, so that the energy smoothness of the train in both traction working conditions and braking working conditions is maintained. It should be noted that the converter (AC/DC circuit, DC/DC circuit) in the present application is not limited to any topology, as long as it satisfies bidirectional energy flow.
As an alternative embodiment, the electric phase separation section passed by the train adopts a single air separation area with the separation distance smaller than the preset distance to realize electric phase separation.
Specifically, referring to fig. 5, fig. 5 is a schematic diagram of an electrical connection of a conventional electrical phase splitter according to an embodiment of the present invention. As shown in fig. 5, the conventional electrical phase splitting employs two air partitions to achieve voltage isolation of two power supply arms (transition region 1 and transition region 2); while the middle neutral section is a dead zone, typically hundreds of meters in length.
Based on this, this application reforms the electric connection of electric phase separation: the 2 transition areas and the long-distance non-electric area shown in fig. 5 are replaced by a short-distance non-electric area, as shown in fig. 3, the voltage of the left power supply arm and the voltage of the right power supply arm are isolated by the non-electric area through air, and the distance of the non-electric area can be greatly shortened compared with the original non-electric area, so that the probability of fault occurrence is reduced, and the reliability of the whole system is improved.
The application also provides a wireless power transmitting device, which is applied to any one of the above automatic passing neutral section systems based on wireless power transmission, and comprises:
a ground coil;
the first power supply conversion circuit is respectively connected with the alternating current power supply system and the ground coil and used for converting alternating current output by the alternating current power supply system into first direct current and converting the first direct current into high-frequency magnetic field through the ground coil to be emitted.
As an alternative embodiment, the first power conversion circuit includes:
the AC/DC circuit is connected with the AC power supply system and is used for converting the AC output by the AC power supply system into DC output;
and the DC/DC circuit is respectively connected with the AC/DC circuit and the ground coil and is used for converting the direct current output by the AC/DC circuit into a first direct current and converting the first direct current into a high-frequency magnetic field through the ground coil to be emitted.
As an alternative embodiment, the AC/DC circuit and the DC/DC circuit are both bidirectional power conversion circuits.
For the introduction of the wireless power transmitting apparatus provided in the present application, please refer to the above embodiments of the auto-passing phase-splitting system, which is not described herein again.
The application also provides a wireless power receiving device, which is applied to any one of the above automatic neutral section passing systems based on wireless power transmission, and comprises:
the vehicle-mounted coil is used for receiving the high-frequency magnetic field transmitted by the wireless electric energy transmitting device and converting the high-frequency magnetic field into second direct current;
and the second power supply conversion circuit is respectively connected with the vehicle-mounted coil and the intermediate direct current loop of the vehicle-mounted converter and is used for converting the second direct current into direct current for the intermediate direct current loop.
As an alternative embodiment, the second power conversion circuit is a bidirectional DC/DC circuit.
For introduction of the wireless power receiving apparatus provided in the present application, please refer to the above-mentioned embodiment of the auto-passing phase-splitting system, which is not described herein again.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (15)
1. An automatic passing neutral section system based on wireless power transmission, comprising:
the wireless electric energy transmitting device is arranged on the ground where the train runs in the electric phase separation section and is used for transmitting wireless electric energy;
and the wireless electric energy receiving device is arranged on the train and used for converting the wireless electric energy into direct current to be supplied to a middle direct current path of the vehicle-mounted converter after receiving the wireless electric energy so as to provide the train with electric energy required by the train running in an electric phase splitting section.
2. The wireless power transmission based automatic passing neutral section system of claim 1, wherein the wireless power transmitting means comprises:
a ground coil;
the first power conversion circuit is connected with the alternating current power supply system and the ground coil respectively and used for converting alternating current output by the alternating current power supply system into first direct current and transmitting the first direct current into a high-frequency magnetic field by the ground coil.
3. The wireless power transmission-based automatic passing neutral section system of claim 2, wherein the wireless power receiving means comprises:
the vehicle-mounted coil is used for converting the received high-frequency magnetic field into second direct current;
and the second power supply conversion circuit is respectively connected with the vehicle-mounted coil and the intermediate direct current loop of the vehicle-mounted converter and is used for converting the second direct current into direct current for the intermediate direct current loop.
4. The wireless power transfer based automatic passing neutral system of claim 2, wherein the first power conversion circuit comprises:
the AC/DC circuit is connected with the alternating current power supply system and is used for converting alternating current output by the alternating current power supply system into direct current to be output;
and the DC/DC circuit is respectively connected with the AC/DC circuit and the ground coil and is used for converting the direct current output by the AC/DC circuit into a first direct current and converting the first direct current into a high-frequency magnetic field through the ground coil to be emitted.
5. The wireless power transmission-based automatic neutral-passing system according to claim 2, wherein the ac power system is a three-phase ac power system or a single-phase ac power system.
6. The wireless power transfer based automatic passing neutral system of claim 3, wherein the second power conversion circuit is a DC/DC circuit.
7. The wireless power transmission based automatic neutral-passing system according to claim 3, wherein the ground coils are laid on the ground where the train runs in the electric neutral section at equal intervals; the vehicle-mounted coils are laid at the bottom of the train at equal intervals.
8. The wireless power transmission-based automatic passing neutral section system of claim 3, wherein the ground coil and the vehicle coil are wound by a D-shaped, V-shaped, E-shaped or S-shaped coil winding manner.
9. The wireless power transmission based automatic neutral-passing system according to claim 3, wherein the second power conversion circuit is further configured to convert the braking power of the train returned to the intermediate dc loop during braking of the electrically split section into a third dc power, and convert the third dc power into a high-frequency magnetic field through the on-board coil for emission;
the ground coil is also used for converting the received high-frequency magnetic field into fourth direct current;
the first power conversion circuit is further configured to convert the fourth direct current into an alternating current and send the alternating current back to the alternating current power system.
10. The wireless power transmission-based automatic neutral-section passing system according to any one of claims 1 to 9, wherein the electric phase separation section passed by the train is electrically separated by a single air separation zone with a separation distance smaller than a preset distance.
11. A wireless power transmitting apparatus applied to the wireless power transmission-based automatic passing neutral section system according to any one of claims 1 to 10, comprising:
a ground coil;
the first power conversion circuit is connected with the alternating current power supply system and the ground coil respectively and used for converting alternating current output by the alternating current power supply system into first direct current and transmitting the first direct current into a high-frequency magnetic field by the ground coil.
12. The wireless power transmitting apparatus of claim 11, wherein the first power conversion circuit comprises:
the AC/DC circuit is connected with the alternating current power supply system and is used for converting alternating current output by the alternating current power supply system into direct current to be output;
and the DC/DC circuit is respectively connected with the AC/DC circuit and the ground coil and is used for converting the direct current output by the AC/DC circuit into a first direct current and converting the first direct current into a high-frequency magnetic field through the ground coil to be emitted.
13. The wireless power transmitting apparatus of claim 12, wherein the AC/DC circuit and the DC/DC circuit are each a bidirectional power conversion circuit.
14. A wireless power receiving device, applied to the wireless power transmission-based automatic passing neutral section system according to any one of claims 1 to 10, comprising:
the vehicle-mounted coil is used for receiving the high-frequency magnetic field transmitted by the wireless power transmitting device and converting the high-frequency magnetic field into second direct current;
and the second power supply conversion circuit is respectively connected with the vehicle-mounted coil and the intermediate direct current loop of the vehicle-mounted converter and is used for converting the second direct current into direct current for the intermediate direct current loop.
15. The radio energy receiving device of claim 14, wherein the second power conversion circuit is a bi-directional DC/DC circuit.
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| CN202110578457.0A CN113103928B (en) | 2021-05-26 | 2021-05-26 | Automatic passing neutral section system, wireless electric energy transmitting and receiving device |
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| CN202110578457.0A CN113103928B (en) | 2021-05-26 | 2021-05-26 | Automatic passing neutral section system, wireless electric energy transmitting and receiving device |
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| CN113103928B (en) | 2022-12-09 |
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