CN115037060A - Multi-stage induction electric field type wireless electric energy transmission system and method and railway vehicle - Google Patents
Multi-stage induction electric field type wireless electric energy transmission system and method and railway vehicle Download PDFInfo
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- CN115037060A CN115037060A CN202210631020.3A CN202210631020A CN115037060A CN 115037060 A CN115037060 A CN 115037060A CN 202210631020 A CN202210631020 A CN 202210631020A CN 115037060 A CN115037060 A CN 115037060A
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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
- H02J50/05—Circuit arrangements or systems for wireless supply or distribution of electric power using capacitive 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
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
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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
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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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- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention provides a multi-stage induction electric field type wireless power transmission system, a method and a rail vehicle, wherein the multi-stage induction electric field type wireless power transmission system comprises the following steps: a power supply and at least one bilateral CL compensation topology circuit; the power supply transfers the electric energy to each load step by step through the bilateral CL compensation topological circuit, and the constant voltage output among the loads is not influenced mutually. The wireless power supply can be realized by a single power supply and multiple loads at the same time, the cable connection is not needed, and the problems of cable abrasion, plug falling and the like caused by the traditional wired power supply mode are effectively avoided.
Description
Technical Field
The invention belongs to the technical field of wireless power supply, and particularly relates to a multi-stage induction electric field type wireless power transmission system and method and a railway vehicle.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
Wireless Power Transfer (WPT) technology transfers electric energy from a Power supply side to a load side by means of energy carriers (such as an electric field, a magnetic field, microwaves, electromagnetic waves, and the like) in a space, and is mainly classified into magnetic field Induction (IPT) and electric field induction (CPT) Wireless Power supply technologies. The electric field induction type wireless power transmission technology is widely concerned by domestic and foreign research teams by the advantages of simple and light coupling mechanisms, strong metal interference resistance, small electromagnetic interference and the like, and various defects of traditional wired power transmission equipment, such as mechanical abrasion, contact sparks and the like, can be overcome by using the CPT technology, so that the way of applying electric energy by human beings is more flexible.
The electric control air brake (ECP) technology can effectively solve the problems of collision and extrusion of vehicles and breakage of a coupler in the braking process of a heavy-duty train. Electronically controlled air brake (ECP) technology requires a cable running through the entire length of the train as the train electrical bus to power the brake controllers of each freight car. However, the distance of the transmission line is long due to the large number of freight cars of the heavy-duty train, and the cable is easily worn and the plug is easily dropped due to the up-and-down bumping of the train, and even the train is stopped in severe cases.
Disclosure of Invention
The invention provides a multi-stage induction electric field type wireless electric energy transmission system, a multi-stage induction electric field type wireless electric energy transmission method and a rail vehicle, which aim to solve the problems.
According to some embodiments, the invention adopts the following technical scheme:
in a first aspect, a multi-stage inductive electric field wireless power transfer system is disclosed, comprising:
a power supply and at least one bilateral CL compensation topology circuit;
the power supply transfers the electric energy to each load step by step through the bilateral CL compensation topological circuit, and the constant voltage output among the loads is not influenced mutually.
As a further technical scheme, each bilateral CL compensation topology circuit includes a primary LC resonance circuit and a secondary LC resonance circuit, which are respectively located in adjacent cars.
As a further technical scheme, the power supply is connected to a primary LC resonance circuit, high-voltage alternating current is generated through an inverter and a primary CL resonance circuit, and is transmitted to a pickup mechanism at the front end of a next-stage freight car through a unipolar coupling pole plate arranged at the tail of a power car.
As a further technical scheme, the power supply, the inverter connected with the power supply and the primary side CL resonant circuit are positioned at the head end power carriage of the train.
As a further technical scheme, the output voltage of the bilateral CL compensation topology circuit is only related to the compensation element parameters, is not affected by the load resistance value and the coupling capacitance change, and can be equivalent to the input voltage of the next carriage, and after the voltage is boosted by the secondary CL compensation circuit, the electric energy is transmitted to the next carriage through a transmitting mechanism at the tail of the freight carriage, so as to supply the electric energy of the whole train.
As a further technical scheme, the bilateral CL compensation topological circuit car body hook and the rail realize backflow.
As a further technical scheme, the unipolar coupling pole plate and the pickup mechanism between the adjacent carriages form a coupling mechanism.
In a second aspect, a multi-stage inductive electric field wireless power transmission method is disclosed, which includes:
the electric energy is transferred to each load step by step through the bilateral CL compensation topological circuit, and the loads are output at constant voltage and are not influenced mutually;
the output voltage of the bilateral CL compensation topology circuit is only related to the parameters of the compensation element, is not influenced by the change of the load resistance value and the coupling capacitance, and can be equivalent to the input voltage of the next carriage, and after the voltage is boosted by the secondary CL compensation circuit, the electric energy is transmitted to the next carriage through a transmitting mechanism at the tail of the freight carriage to supply the electric energy of the whole train.
In a third aspect, a rail vehicle is disclosed, and the rail vehicle uses the above multi-stage induction electric field type wireless power transmission system or method to supply power to the whole train.
As a further technical scheme, each load voltage in the railway vehicle is constant, the load voltage of a previous-stage circuit is used as the input voltage of a next-stage circuit, the output power of each-stage load is only related to equivalent load impedance, the circuits of each stage are not affected by each other, and the output characteristic is unrelated to the mutual capacitance between adjacent carriage coupling polar plates.
Compared with the prior art, the invention has the following beneficial effects:
the invention can realize wireless power supply with single power supply and multiple loads at the same time without cable connection, thereby effectively avoiding the problems of cable abrasion, plug falling and the like caused by the traditional wired power supply mode.
The vertical jolt of the heavy haul train is easy to cause the mutual capacitance change, the output characteristic of the traditional CPT compensation topology is changed due to the change of the mutual capacitance, and the bilateral CL compensation topology structure provided by the invention can realize that the output characteristic is not influenced by the mutual capacitance change.
The bilateral CL compensation topological structure provided by the invention can realize that the output voltages of all levels of loads are not influenced mutually.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a circuit installation diagram of an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of an embodiment of the present invention;
fig. 3 is an equivalent schematic diagram of a coupling mechanism according to an embodiment of the invention.
FIG. 4 is an equivalent circuit diagram of an embodiment of the present invention.
The specific implementation mode is as follows:
the invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The first embodiment is as follows:
in the present embodiment, a train is used for illustration, but it does not mean that the power transmission system provided by the present invention is only applicable to rail vehicles. The power supply system can be applied to other vehicles according to different power supply objects.
As can be seen from the background, how to safely and effectively provide electrical energy to an ECP brake system is a problem to be solved. The inductive electric field (CPT) wireless power transmission technology can effectively solve the above problems by transmitting energy through an electric field without cable direct connection.
In this embodiment, specifically disclose a multistage induction electric field formula wireless power transmission system, include:
a power supply and at least one bilateral CL compensation topology circuit;
the power supply transfers the electric energy to each load step by step through the bilateral CL compensation topological circuit, and the constant voltage output among the loads is not influenced mutually.
Each two-side CL compensation topology circuit comprises a primary side LC resonance circuit and a secondary side LC resonance circuit, and the primary side LC resonance circuit and the secondary side LC resonance circuit are respectively positioned in adjacent compartments.
The power supply is connected to the primary LC resonance circuit, high-voltage alternating current is generated through the inverter and the primary CL resonance circuit, and is transmitted to the pickup mechanism at the front end of the next-stage freight car through the single-pole coupling pole plate arranged at the tail of the power car. The unipolar coupling plates are metal plates, and as shown in fig. 3, the coupling plates at the tail end and the front end of the carriage form a plate capacitor for transmitting high-frequency current.
The power supply, the inverter connected with the power supply and the primary CL resonant circuit are positioned at the head end of the train.
The output voltage of the bilateral CL compensation topology circuit is only related to the parameters of the compensation element, is not influenced by the change of the load resistance value and the coupling capacitance, and can be equivalent to the input voltage of the next carriage, and after the voltage is boosted by the secondary CL compensation circuit, the electric energy is transmitted to the next carriage through a transmitting mechanism at the tail part of the freight carriage, so that the electric energy supply of the whole train is carried out.
And the bilateral CL compensation topology circuit car body hook and the rail realize backflow.
The unipolar coupling polar plate and the pickup mechanism between the adjacent carriages form a coupling mechanism.
Example two:
the embodiment discloses a multi-stage induction electric field type wireless power transmission method, which comprises the following steps:
the electric energy is transferred to each load step by step through the bilateral CL compensation topological circuit, and the loads are output at constant voltage and are not influenced mutually;
the output voltage of the bilateral CL compensation topological circuit is only related to the parameters of the compensation element, is not influenced by the change of the resistance value of a load and the coupling capacitance, and can be equivalent to the input voltage of the next carriage, and after the voltage is boosted by the secondary CL compensation circuit, the electric energy is transmitted to the next carriage through a transmitting mechanism at the tail part of the freight carriage to supply the electric energy of the whole train.
Specifically, in the actual working process, as shown in fig. 1, a system input voltage source is provided by a power carriage at the head end of a heavy-duty train, high-voltage alternating current is generated through a primary side inverter and a CL resonant circuit, is transmitted to a pickup mechanism at the front end of a next-stage freight carriage through a unipolar coupling pole plate installed at the tail part of the power carriage, and is converted into direct current through a secondary side LC resonant circuit and a rectifier bridge to supply power to a brake controller of the carriage. According to the analysis of the bilateral CL compensation topological circuit, the output voltage is only related to the parameters of the compensation element and is not influenced by the change of the load resistance value and the coupling capacitance, so that the output voltage can be equivalent to the input voltage of the next carriage, and after the voltage is boosted by the secondary CL compensation circuit, the electric energy is transmitted to the next carriage through a transmitting mechanism at the tail of the freight carriage, so that the electric energy supply of the whole train is realized. And finally realizing backflow through the rail.
The whole power supply circuit has a return wire, the return wire is connected to the shaft end of the wheel pair, and the shaft end is connected with the steel rail through the wheel pair, so that grounding is realized.
As shown in fig. 2, the N transmission channel long-distance CPT power supply system is a bilateral CL circuit topology. Taking transmission channel 1 as an example, C M1 Is a coupling capacitor, L P1 、C P1 As primary compensation element, L S1 And C S1 As secondary side compensating elements, U DC For a DC input voltage, U IN For the inverter to output voltage, the dc power source and the inverter are equivalent to an ac voltage source. Assuming that the pulse width of the output voltage of the inverter is always 180 degrees, the effective value of the fundamental wave is as follows:
with R LeqN Representing the equivalent resistance of the input end of the rectifier and satisfying the relation:
FIG. 3 is a schematic diagram of a coupling mechanism, P1 and P2 are energy transmission polar plates, and P3 and P4 simulate a train box body. Fig. 4 (a) is a schematic diagram showing an equivalent circuit, and (b) is a specific equivalent circuit diagram.
Resonance relation:
L P1 、C P1 resonance, L s1 、C s1 Resonance, L P1 、C M1 、L s1 And (4) resonating.
Voltage parameters:
1 st Thevenin transformation:
U IN 、C P1 is converted into and capacitance C P1 Parallel current source U IN /[1/(jwC P1 )]；
At this time L P1 、C P1 A parallel resonance open circuit occurs, and a current source U IN /[1/(jwC P1 )]Directly applied to C M1 Between the current source and the ground, the internal resistance of the current source is infinite, and C can be ignored M1 。
2 nd Thevenin transformation:
at this time, the current source U IN /[1/(jwC P1 )]And L s1 Parallel convertible voltage source U IN /[1/(jwC P1 )]*(jwL s1 ) And L s1 In series connection with C s1 In series, wherein L s1 And C s1 Short-circuiting of series resonance, i.e.
Namely, it is
The same principle is that:
therefore, each load voltage is constant, the load voltage of the previous stage circuit is used as the input voltage of the next stage circuit, the output power of each stage of load is only related to the equivalent load impedance, the circuits of each stage are not affected by each other, and the output characteristic is related to C MN Irrelevantly, when the train is on-line and bumpy, the result C MN When the load is changed, the output characteristics of the loads at all levels are not influenced mutually.
The derivation of the above formula yields: the load voltage is constant, the load voltage of the previous stage circuit is used as the input voltage of the next stage circuit, the output power of each stage of load is only related to the equivalent load impedance, the circuits of each stage are not affected by each other, and the output characteristic is equal to C MN Irrelevantly, when the train is on-line and bumpy, the result C MN When the load is changed, the output characteristics of the loads of all stages are not influenced mutually. C MN The coupling capacitance between the coupling pole plate at the tail part of the (N-1) th carriage and the coupling pole plate at the front end of the next-stage carriage is represented, and the capacitance is related to the pole plate gap size and is easily influenced by the bumping of the train.
Therefore, in order to realize the wireless power supply of the ECP braking system of the heavy haul train, the invention provides the multi-stage induction electric field type wireless power transmission system based on the bilateral CL compensation topology, which can transmit the electric energy from the first power carriage of the heavy haul train to the ECP braking system of each freight carriage one by one through a wireless power supply technology to supply power, realize that a single power supply supplies power to a plurality of loads simultaneously, and avoid the problems of cable abrasion, plug falling and the like caused by the up-and-down bump of the train in the traditional wired power supply mode.
Example three:
the embodiment discloses a railway vehicle, and the railway vehicle is provided with the multi-stage induction electric field type wireless power transmission system or method for supplying power to the whole train.
The load voltage in the rail vehicle is constant, the load voltage of the previous-stage circuit is used as the input voltage of the next-stage circuit, the output power of each-stage load is only related to equivalent load impedance, circuits of each stage are not affected with each other, and the output characteristic is unrelated to the coupling capacitance of the coupling pole plate at the end part of the rail vehicle.
Finally, the invention realizes the step-by-step electric energy transfer by utilizing the bilateral CL compensation topology, the output characteristic of each stage of load is not changed by the mutual capacitance change, and the constant voltage output among all the loads is realized without mutual influence.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive changes in the technical solutions of the present invention.
Claims (10)
1. A multi-stage inductive electric field type wireless electric energy transmission system is characterized by comprising:
a power supply and at least one bilateral CL compensation topology circuit;
the power supply transfers the electric energy to each load step by step through the bilateral CL compensation topological circuit, and the constant voltage output among the loads is not influenced mutually.
2. The multi-stage inductive electric field type wireless power transmission system of claim 1, wherein each double-side CL compensation topology circuit comprises a primary side LC resonance circuit and a secondary side LC resonance circuit, and the primary side LC resonance circuit and the secondary side LC resonance circuit are respectively located in adjacent cars.
3. The multi-stage induction electric field type wireless power transmission system as claimed in claim 2, wherein the power supply is connected to the primary side LC resonant circuit, and the high voltage ac power is generated through the inverter and the primary side CL resonant circuit and transmitted to the pickup mechanism at the front end of the next stage freight car through the single-pole type coupling plate installed at the tail of the power car.
4. The multi-stage inductive electric field type wireless power transmission system as claimed in claim 2, wherein said power source and the inverter and primary side CL resonant circuit connected to the power source are located at the head-end power car of the train.
5. The multi-stage inductive electric field type wireless electric energy transmission system of claim 1, wherein the output voltage of the bilateral CL compensation topology circuit is only related to the parameters of the compensation element, is not affected by the change of the load resistance value and the coupling capacitance, and is equivalent to the input voltage of the next carriage, and after the voltage is boosted by the secondary CL compensation circuit, the electric energy is transmitted to the next carriage through a transmitting mechanism at the tail of the freight carriage, so that the electric energy supply of the whole train is carried out.
6. The multi-stage inductive electric field type wireless power transmission system of claim 1, wherein the bilateral CL compensation topology circuit car body hook and the rail implement a backflow.
7. The multi-stage inductive electric field wireless power transmission system as claimed in any one of claims 1 to 6, wherein the unipolar coupling electrode plates and the pick-up mechanism between adjacent cars constitute the coupling mechanism.
8. A multi-stage induction electric field type wireless electric energy transmission method is characterized by comprising the following steps:
the electric energy is transferred to each load step by step through the bilateral CL compensation topological circuit, and the loads are output at constant voltage and are not influenced mutually;
the output voltage of the bilateral CL compensation topological circuit is only related to the parameters of the compensation element, is not influenced by the change of the resistance value of a load and the coupling capacitance, and can be equivalent to the input voltage of the next carriage, and after the voltage is boosted by the secondary CL compensation circuit, the electric energy is transmitted to the next carriage through a transmitting mechanism at the tail part of the freight carriage to supply the electric energy of the whole train.
9. A rail vehicle is characterized in that the rail vehicle is provided with the multi-stage induction electric field type wireless power transmission system or method to supply power to the whole train.
10. The railway vehicle as claimed in claim 9, wherein the load voltages of the railway vehicle are constant, the load voltage of the previous circuit is used as the input voltage of the next circuit, the output power of each stage of load is only related to the equivalent load impedance, the circuits of each stage are not affected by each other, and the output characteristic is not related to the mutual capacitance between the coupling plates of the adjacent cars.
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| CN202210631020.3A CN115037060A (en) | 2022-06-06 | 2022-06-06 | Multi-stage induction electric field type wireless electric energy transmission system and method and railway vehicle |
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| CN202210631020.3A CN115037060A (en) | 2022-06-06 | 2022-06-06 | Multi-stage induction electric field type wireless electric energy transmission system and method and railway vehicle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115632493A (en) * | 2022-12-21 | 2023-01-20 | 成都西交轨道交通技术服务有限公司 | Multi-load power supply CPT system based on relay polar plate |
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2022
- 2022-06-06 CN CN202210631020.3A patent/CN115037060A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115632493A (en) * | 2022-12-21 | 2023-01-20 | 成都西交轨道交通技术服务有限公司 | Multi-load power supply CPT system based on relay polar plate |
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