CN114274801A - Output voltage fluctuation suppression method of three-phase dynamic wireless power supply system based on short-distance receiving coil - Google Patents

Output voltage fluctuation suppression method of three-phase dynamic wireless power supply system based on short-distance receiving coil Download PDF

Info

Publication number
CN114274801A
CN114274801A CN202011032848.4A CN202011032848A CN114274801A CN 114274801 A CN114274801 A CN 114274801A CN 202011032848 A CN202011032848 A CN 202011032848A CN 114274801 A CN114274801 A CN 114274801A
Authority
CN
China
Prior art keywords
coil
magnetic field
short
receiving coil
harmonic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202011032848.4A
Other languages
Chinese (zh)
Other versions
CN114274801B (en
Inventor
崔淑梅
宋贝贝
高鑫
杜博超
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Harbin Institute of Technology
Original Assignee
Harbin Institute of Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Harbin Institute of Technology filed Critical Harbin Institute of Technology
Priority to CN202011032848.4A priority Critical patent/CN114274801B/en
Publication of CN114274801A publication Critical patent/CN114274801A/en
Application granted granted Critical
Publication of CN114274801B publication Critical patent/CN114274801B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • 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
    • 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

Landscapes

  • Current-Collector Devices For Electrically Propelled Vehicles (AREA)

Abstract

The invention provides a method for suppressing output voltage fluctuation of a three-phase dynamic wireless power supply system based on a short-distance receiving coil. The method for suppressing the fluctuation of the output voltage based on the short-distance receiving coil is simultaneously suitable for wireless power supply transmitting terminal devices with different structures such as a three-phase zigzag transmitting coil, a three-phase I-shaped power supply guide rail and the like.

Description

Output voltage fluctuation suppression method of three-phase dynamic wireless power supply system based on short-distance receiving coil
Technical Field
The invention belongs to the technical field of wireless power transmission, and particularly relates to a method for suppressing output voltage fluctuation of a three-phase dynamic wireless power supply system based on a short-distance receiving coil.
Background
The dynamic wireless power supply technology can realize the non-contact power supply of electric automobiles, rail trains, factory carrying equipment and mobile portable equipment. Compared with the traditional wired power supply mode, the technology has the advantages of high safety, water resistance, dust resistance, flexibility in charging and the like. Under the same transmission distance, the three-phase dynamic wireless power supply system has higher output power compared with a single-phase system, and meanwhile, the travelling wave magnetic field can be utilized to reduce the output power fluctuation, so that the three-phase dynamic wireless power supply system is widely applied to high-power application occasions.
Various research institutions at home and abroad carry out a lot of research on a Three-Phase dynamic wireless Power supply system, and documents [ H.Matsumoto, Y.Shibako, Y.Shiihara, R.Nagata and Y.Neba, "Three-Phase Lines to Single-Phase soil plasma reactor contact Power Transformer," in IEEE Transactions on Industrial Electronics, vol.65, No.4, pp.2904-2914, April 2018, doi:10.1109/TIE.2017.2748049 ] propose a Three-Phase zigzag wireless Power supply system, wherein a transmitting end of the system adopts a Three-Phase zigzag transmitting Coil, and a receiving end of the system adopts a Single-Phase circular Coil. The document [ S.Cui, B.Song, X.Gao and S.Dong "," A Narrow-Width thread Phase Magnetic Coupling Mechanism with Constant Output Power for Electric Vehicles Dynamic steering "," 2018IEEE PELS Workshop on emitting Technologies: Wireless Power Transfer (Wow), Montr eal, QC,2018, pp.1-6, doi:10.1109/WoW.2018.8450657 ] proposes a Three-Phase type I Wireless Power supply system which uses type I Power supply rails and further increases the transmission distance. Patent application publication No. CN 109660032A proposes a three-phase receiving end structure, which solves the problem of inconsistent phase voltages caused by stacking three-phase receiving coils. However, the above systems have a common disadvantage: there is output power fluctuation. Harmonic components in a traveling wave magnetic field generated by the three-phase transmitting coil can generate harmonic induced voltage in the receiving coil, and the phase difference between the harmonic induced voltage and the fundamental induced voltage can change along with the position of the receiving end in the process of moving the receiving end. Therefore, harmonic components in the traveling wave magnetic field generate harmonic induced voltage in the receiving coil, so that the amplitude of the output voltage of the receiving end changes along with the position of the receiving end, and the output voltage fluctuates. In a dynamic wireless power supply system, in order to realize constant voltage/constant current charging of a vehicle-mounted battery, it is necessary to ensure that the output voltage of a receiving end is constant. The large output voltage fluctuation not only increases the design difficulty of the receiving end converter, but also reduces the average output power of the system. Therefore, suppressing output power fluctuation is an urgent problem to be solved in the three-phase dynamic wireless power supply technology.
Disclosure of Invention
The invention aims to solve the problem of large output voltage fluctuation in the conventional three-phase dynamic wireless power supply system, and provides a method for inhibiting the output voltage fluctuation of the three-phase dynamic wireless power supply system based on a short-distance receiving coil. The method of the invention utilizes the short-distance receiving coil to eliminate the induced voltage generated in the receiving coil by the harmonic traveling wave magnetic field generated by the three-phase transmitting coil, thereby effectively inhibiting the fluctuation of the output voltage in the three-phase dynamic wireless power supply system and realizing the constancy of the output voltage. The method for suppressing the fluctuation of the output voltage based on the short-distance receiving coil is simultaneously suitable for wireless power supply transmitting terminal devices with different structures such as a three-phase zigzag transmitting coil, a three-phase I-shaped power supply guide rail and the like.
The invention is realized by the following technical scheme, and provides a method for suppressing the fluctuation of the output voltage of a three-phase dynamic wireless power supply system based on a short-distance receiving coil, which specifically comprises the following steps:
step 1: the transmitting end device of the three-phase dynamic wireless power supply system adopts a three-phase transmitting coil, and three-phase symmetrical high-frequency alternating current is introduced into each phase of transmission; obtaining the magnetic field distribution generated by the single-phase transmitting coil on the receiving end plane in a magnetic field analytical calculation or finite element simulation mode;
step 2: the magnetic field generated by the single-phase transmitting coil is subjected to Fourier decomposition, fundamental wave components and higher harmonic components in the magnetic field are determined, and the magnetic poles generated by the transmitting coil are N poles and S poles are distributed in a staggered manner along the traveling direction, so that the harmonic magnetic field only contains odd-order components;
and step 3: the length of the short-distance receiving coil is designed based on harmonic components in a magnetic field generated by the single-phase transmitting coil, and the induction voltage generated by the harmonic magnetic field in the receiving coil can be eliminated by designing the length of the short-distance receiving coil, so that the purpose of inhibiting the fluctuation of the output voltage in the dynamic power supply process is achieved.
Further, the design principle of the short-distance receiving coil is specifically as follows:
(1) 3-order harmonic magnetic fields generated by the three-phase transmitting coil can be mutually offset in space, so that the 3-order harmonic magnetic fields have no influence on the fluctuation of output voltage; when the magnetic field generated by the single-phase transmitting coil only contains 5-order harmonic component, the length of the short-distance receiving coil is designed to be 4 tau/5, wherein tau is the polar distance of the transmitting end, the induced voltages generated by the 5-order harmonic magnetic field in the receiving coil are mutually counteracted, the voltage in the receiving coil is only generated by the fundamental wave magnetic field, and in the moving process of the receiving end, the amplitude of the induced voltage generated by the fundamental wave magnetic field is unchanged, and the output voltage of the system is constant;
(2) when the magnetic field generated by the single-phase transmitting coil only contains 7-th harmonic component, the length of the short-distance receiving coil is designed to be 6 tau/7; similarly, when the magnetic field generated by the single-phase transmitting coil only contains i-th harmonic component, where i is 5,7,9,11 … …, the length of the short-distance receiving coil is designed to be equal to
Figure BDA0002704315850000021
At the moment, the induced voltages generated by the i-th harmonic magnetic field in the receiving coil are mutually offset, the induced voltage in the receiving coil is only generated by the fundamental wave magnetic field, and the output voltage of the system is constant in the moving process of the receiving end;
(3) when the magnetic field generated by the single-phase transmitting coil only contains 5 th harmonic component and 7 th harmonic component, the length of the short-distance receiving coil is designed to be 5 tau/6, and the short-distance receiving coil can simultaneously inhibit harmonic induction voltage generated by the 5 th harmonic magnetic field and the 7 th harmonic magnetic field in the receiving coil, so that the purpose of inhibiting the fluctuation of the output voltage of the system is realized; similarly, when the magnetic field generated by the single-phase transmitting coil only contains i-th harmonic component and i +2 th harmonic component at the same time, the length of the short-distance receiving coil is designed to be
Figure BDA0002704315850000031
At the moment, the short-distance receiving coil can simultaneously inhibit the i-th harmonic magnetic field and the i +2 th harmonicThe induced voltage generated by the wave magnetic field in the receiving coil achieves the purpose of inhibiting the fluctuation of the output voltage of the system.
Furthermore, the short-distance receiving coil is a rectangular coil, and the length of the rectangular coil is lcoilWidth of rectangular coil is wcoilFor the purpose of suppressing output voltage fluctuation, the rectangular coil length lcoilAccording to the higher harmonic component in the magnetic field generated by the single-phase transmitting coil; width w of rectangular coilcoilOnly the amplitude of the induced voltage in the receiving coil is influenced, and the induced voltage generated by the harmonic magnetic field is not inhibited, so that the width w of the coil is changedcoilOnly the amplitude of the output voltage of the system is influenced, and the fluctuation of the output voltage of the system is not influenced; the width w of the rectangular coilcoilAccording to the transmission power required by the system.
Furthermore, the short-distance receiving coils are wound by litz wires or stranded enameled wires insulated from each other, and the number of turns of the short-distance receiving coils is NSIn which N isSIs a positive integer and is determined according to the transmission power required by the system.
Furthermore, the short-distance receiving coil is matched with a flat plate type receiving end magnetic core for use, and the flat plate type receiving end magnetic core is made of ferrite materials and is laid right above the short-distance receiving coil for restraining the direction of magnetic lines of force and shielding a leakage magnetic field; the size of the flat receiving end magnetic core is larger than or equal to that of the short-distance receiving coil.
Further, a plurality of said short range receiving coils are used in series; the sizes of the plurality of short-distance receiving coils connected in series are completely the same, and two adjacent short-distance receiving coils can be placed closely together or at a certain distance.
The method for inhibiting the fluctuation of the output voltage of the three-phase dynamic wireless power supply system based on the short-distance receiving coil has the following beneficial effects that: the method can eliminate the induced voltage generated by the harmonic traveling wave magnetic field generated by the three-phase transmitting coil in the receiving coil by reasonably designing the length of the short-distance receiving coil, thereby effectively inhibiting the fluctuation of the output voltage in the three-phase dynamic wireless power supply system and realizing the constancy of the output voltage. On one hand, the method can reduce the fluctuation range of the input voltage of the DC/DC converter at the receiving end, and effectively reduce the design difficulty of the DC/DC converter. On the other hand, the method does not need a complex control strategy, and can realize the constant voltage/constant current charging of the vehicle-mounted battery only by reasonably designing the length of the receiving coil in the receiving end device, thereby effectively improving the reliability of the system. Meanwhile, the method has universality and can be simultaneously suitable for dynamic wireless power supply systems with different transmitting end structures, such as a three-phase zigzag transmitting coil, a three-phase I-shaped power supply guide rail and the like.
Drawings
Fig. 1 is a flowchart of a method for suppressing output voltage fluctuation in a three-phase dynamic wireless power supply system according to the present invention;
FIG. 2 is a schematic diagram of a short-range receiving coil according to the present invention;
FIG. 3 is a schematic structural diagram of a three-phase meander type transmitting terminal when it is coupled with a short-distance receiving coil;
FIG. 4 is a front view of FIG. 3;
FIG. 5 is a schematic diagram of the magnetic field distribution generated by a single-phase transmitting coil at the receiving end plane;
FIG. 6 is a phasor diagram of induced voltages generated by a fundamental traveling wave magnetic field and a harmonic traveling wave magnetic field in a single receiving conductor;
FIG. 7 is a graph showing the variation of the induced voltage in the full-pitch receiver coil with the position of the receiver end;
FIG. 8 is a schematic diagram of the principle of using a short range receive coil to suppress the 5 th harmonic induced voltage;
FIG. 9 is a schematic diagram of the principle of using a short range receive coil to suppress the induced voltage of the 7 th harmonic;
FIG. 10 is a schematic diagram showing a variation curve of an effective value of an output voltage with a position of a receiving end after the output voltage fluctuation suppression method according to the present invention is used;
FIG. 11 is a schematic structural view of the short-range receiving coil and the receiving end magnetic core according to the present invention;
FIG. 12 is a schematic diagram of a plurality of short range receiver coils used in series;
the part names corresponding to the reference numbers in the figures are as follows:
1-short-range receiving coil;
2-three-phase transmitting coil;
3-receiving end plane;
4-a full-pitch receiving coil;
5-receiving end flat magnetic core;
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
With reference to fig. 1 to 12, the present invention provides a method for suppressing output voltage fluctuation of a three-phase dynamic wireless power supply system based on a short-distance receiving coil, where the method specifically includes the following steps:
step 1: the transmitting end device of the three-phase dynamic wireless power supply system adopts a three-phase transmitting coil, and three-phase symmetrical high-frequency alternating current is introduced into each phase of transmission; obtaining the magnetic field distribution generated by the single-phase transmitting coil on the receiving end plane in a magnetic field analytical calculation or finite element simulation mode;
step 2: the magnetic field generated by the single-phase transmitting coil is subjected to Fourier decomposition, fundamental wave components and higher harmonic components in the magnetic field are determined, and because magnetic poles generated by the transmitting coil are N poles and S poles are distributed in a staggered mode along the traveling direction, the harmonic magnetic field only contains odd-numbered components, namely 3-order harmonic components, 5-order harmonic components and 7-order harmonic components …;
and step 3: the length of the short-distance receiving coil is designed based on harmonic components in a magnetic field generated by the single-phase transmitting coil, and the induction voltage generated by the harmonic magnetic field in the receiving coil can be eliminated by designing the length of the short-distance receiving coil, so that the purpose of inhibiting the fluctuation of the output voltage in the dynamic power supply process is achieved.
The design principle of the short-distance receiving coil is as follows:
(1) 3-order harmonic magnetic fields generated by the three-phase transmitting coil can be mutually offset in space, so that the 3-order harmonic magnetic fields have no influence on the fluctuation of output voltage; when the magnetic field generated by the single-phase transmitting coil only contains 5-order harmonic component, the length of the short-distance receiving coil is designed to be 4 tau/5, wherein tau is the polar distance of the transmitting end, the induced voltages generated by the 5-order harmonic magnetic field in the receiving coil are mutually counteracted, the voltage in the receiving coil is only generated by the fundamental wave magnetic field, and in the moving process of the receiving end, the amplitude of the induced voltage generated by the fundamental wave magnetic field is unchanged, and the output voltage of the system is constant;
(2) when the magnetic field generated by the single-phase transmitting coil only contains 7-th harmonic component, the length of the short-distance receiving coil is designed to be 6 tau/7; similarly, when the magnetic field generated by the single-phase transmitting coil only contains i-th harmonic component, where i is 5,7,9,11 … …, the length of the short-distance receiving coil is designed to be equal to
Figure BDA0002704315850000051
At the moment, the induced voltages generated by the i-th harmonic magnetic field in the receiving coil are mutually offset, the induced voltage in the receiving coil is only generated by the fundamental wave magnetic field, and the output voltage of the system is constant in the moving process of the receiving end;
(3) when the magnetic field generated by the single-phase transmitting coil only contains 5 th harmonic component and 7 th harmonic component, the length of the short-distance receiving coil is designed to be 5 tau/6, and the short-distance receiving coil can simultaneously inhibit harmonic induction voltage generated by the 5 th harmonic magnetic field and the 7 th harmonic magnetic field in the receiving coil, so that the purpose of inhibiting the fluctuation of the output voltage of the system is realized; similarly, when the magnetic field generated by the single-phase transmitting coil only contains i-th harmonic component and i +2 th harmonic component at the same time, the length of the short-distance receiving coil is designed to be
Figure BDA0002704315850000052
At the moment, the short-distance receiving coil can simultaneously inhibit the induced voltage generated by the i-th harmonic magnetic field and the i + 2-th harmonic magnetic field in the receiving coil, so that the output voltage wave of the system is inhibitedThe purpose of moving.
The short-distance receiving coil is a rectangular coil with the length of lcoilWidth of rectangular coil is wcoilFor the purpose of suppressing output voltage fluctuation, the rectangular coil length lcoilAccording to the higher harmonic component in the magnetic field generated by the single-phase transmitting coil; width w of rectangular coilcoilOnly the amplitude of the induced voltage in the receiving coil is influenced, and the induced voltage generated by the harmonic magnetic field is not inhibited, so that the width w of the coil is changedcoilOnly the amplitude of the output voltage of the system is influenced, and the fluctuation of the output voltage of the system is not influenced; the width w of the rectangular coilcoilAccording to the transmission power required by the system.
The short-distance receiving coils are wound by litz wires or stranded enameled wires insulated from each other, and the number of turns of the short-distance receiving coils is NSIn which N isSIs a positive integer and is determined according to the transmission power required by the system.
The short-distance receiving coil is matched with a flat plate type receiving end magnetic core for use, and the flat plate type receiving end magnetic core is made of ferrite materials and is laid right above the short-distance receiving coil and used for restricting the direction of a magnetic line and shielding a leakage magnetic field; the size of the flat receiving end magnetic core is larger than or equal to that of the short-distance receiving coil.
The short-distance receiving coils can be used together by connecting a plurality of short-distance receiving coils in series; when the output voltage of a single short-distance receiving coil cannot meet the requirement of the system, a plurality of short-distance receiving coils can be used in series; the sizes of the plurality of short-distance receiving coils connected in series are completely the same, and two adjacent short-distance receiving coils can be placed closely together or at a certain distance. Because the harmonic induced voltage generated by the harmonic magnetic field component in the coil is eliminated by the single short-distance receiving coil, after the plurality of short-distance receiving coils are used in series, the total output voltage of the receiving end does not contain the harmonic induced voltage component, and the total output voltage of the system can be kept constant in the moving process of the receiving end.
The working principle is as follows:
the method for suppressing the fluctuation of the output voltage based on the short-distance receiving coil is described below by taking a dynamic wireless power supply system of a three-phase zigzag transmitting terminal as an example.
The structure of the three-phase zigzag transmitting terminal is schematically shown in fig. 3 and fig. 4, and the structure is composed of three-phase transmitting cables. The transmitting cable is buried under the road surface and laid in parallel to the y-axis direction. In a single-phase transmission cable, the distance between two adjacent conductors is called the pole pitch τ. In order to generate a travelling magnetic field, the phase transmitting coils are placed 2 τ/3 apart in the x-axis direction.
After the structural parameters of a transmitting end of a three-phase dynamic wireless power supply system are input, the magnetic field distribution generated by a single-phase transmitting coil on a receiving end plane is obtained in a finite element simulation mode, and when constant current is introduced into an A-phase transmitting cable, a magnetic field B generated by the A-phase transmitting cable on the receiving end plane is obtainedz-AThe distribution of (a) is shown in fig. 5. As can be seen from the figure, Bz-AIn addition to the fundamental magnetic field, there are 3 rd, 5 th and 7 th harmonic magnetic fields. For the i-th harmonic magnetic field, its pole pitch τiIs 1/i of the fundamental pole pitch tau. Thus, Bz-AThe expression on the receiving end plane satisfies:
Bz-AΣ(x,y)＝Bz-A1(x,y)+Bz-A3(x,y)+Bz-A5(x,y)+Bz-A7(x,y) (1)
wherein the fundamental magnetic field component Bz-A1The expression of (1) satisfies:
Figure BDA0002704315850000061
and the expression for the i-th harmonic component satisfies:
Figure BDA0002704315850000062
when symmetrical alternating current is introduced into the three-phase transmitting coil, the fundamental wave magnetic field component B generated by the three-phase transmitting coil on the receiving end planez-A1，Bz-B1And Bz-C1Satisfies the following formula:
Figure BDA0002704315850000071
where t is time, ω is angular velocity, and the resultant magnetic field B of the fundamental magnetic fieldz-∑1Satisfies the following conditions:
Figure BDA0002704315850000072
similarly, the synthetic magnetic field of the harmonic component can be obtained to satisfy:
Figure BDA0002704315850000073
from the above equation, the resultant magnetic field of the 3 rd harmonic component is 0. This indicates that the 3 rd harmonic magnetic fields generated by the transmitting coils of each phase cancel each other out at the receiving end plane and do not contribute to energy transfer.
For a single width w in the receive coilcoilThe fundamental wave synthetic magnetic field and the i-th harmonic synthetic magnetic field generate induced voltage e in the conductor1And eiSatisfies the following conditions:
Figure BDA0002704315850000074
where f is the frequency, so that the total induced voltage e in the conductorc-∑Comprises the following steps:
ec-∑＝e1+e5+e7 (8)
in terms of phase difference, e1And e5Phase difference phi between5Satisfies the following conditions:
Figure BDA0002704315850000075
e1and e7Phase difference phi between7Satisfies the following conditions:
Figure BDA0002704315850000076
as can be seen from the formulae (9) and (10) (. psi.)5And psi7Are all related to the location of the conductor. FIG. 6 shows the induced voltage e in the conductor1，e5，e7And ec-∑As a function of the conductor position x.
As can be seen in the figure, the effective value E of the total induced voltage in the conductor is every time the conductor is translated in the x-axis direction by a distance of tau/3∑Pulsing once. When x is k τ/3 (k is a natural number), E∑The maximum value is reached:
EΣ-max＝E1+E5+E7 (11)
and when x is k τ/3+ τ/6, E∑Reaching a minimum value:
EΣ-min＝E1-E5-E7 (12)
therefore, during the movement of the receiving end, the 5 th and 7 th harmonic magnetic fields will generate induced voltages in the receiving coil, so that the amplitude of the output voltage of the receiving end varies with the position of the receiving end, and the output voltage fluctuates. The induced voltage in a single conductor as a function of the position of the receiving end is shown in fig. 7.
For a full-length receiving coil of length tau, the induced voltage of the coil
Figure BDA0002704315850000081
Equal to the induced voltages in two effective edges
Figure BDA0002704315850000082
And
Figure BDA0002704315850000083
the sum of (a):
Figure BDA0002704315850000084
thus, the fluctuation factor of the induced voltage in a full-pitch receive coil of length τ is exactly the same as the voltage fluctuation in a single conductor. In summary, in order to suppress the output voltage fluctuation of the dynamic wireless power supply system, it is necessary to eliminate the harmonic induced voltage generated in the receiving coil by the harmonic magnetic field.
Since the 3 rd harmonic magnetic fields generated by the three-phase transmitting coils can be mutually cancelled in space, the 3 rd harmonic magnetic fields have no influence on the output voltage fluctuation. When the magnetic field generated by the single-phase transmitting coil only contains 5 th harmonic wave components, the length of the short-distance receiving coil is designed to be 4 tau/5, wherein tau is the polar distance of the transmitting end. At this time, the left and right effective sides of the coil are always under the same magnetic field position in the 5 th harmonic magnetic field, as shown in fig. 8. Therefore, the induced voltages generated by the 5 th harmonic magnetic field in the two effective sides are identical. For the receiving coil, 5-order harmonic induced voltages in two effective sides always cancel each other out, the induced voltage in the receiving coil is generated only by a fundamental wave magnetic field, and in the moving process of the receiving end, because the amplitude of the induced voltage generated by the fundamental wave magnetic field is unchanged, the output voltage of the system is constant, and therefore the purpose of inhibiting the fluctuation of the output voltage can be achieved. The curve of the effective value of the system output voltage along with the position of the receiving end after the short-distance receiving coil is used is shown in figure 10.
When the magnetic field generated by the single-phase transmitting coil only contains 7 th harmonic component, the length of the short-distance receiving coil is designed to be 6 tau/7, and the left and right effective sides in the coil are always under the same magnetic field position in the 7 th harmonic magnetic field, as shown in fig. 9. The induced voltages generated by the 7 th harmonic magnetic field in the two active sides are identical. For the receiving coil, 7-order harmonic induced voltages in two effective sides always cancel each other out, the voltage in the receiving coil is only generated by a fundamental wave magnetic field, and in the moving process of the receiving end, because the amplitude of the induced voltage generated by the fundamental wave magnetic field is unchanged, the output voltage of the system is constant, so that the purpose of inhibiting the fluctuation of the output voltage can be achieved.
Similarly, when the magnetic field generated by the single-phase transmitting coil only contains i-th harmonic component, wherein i is 5,7,9,11 …,the length of the short-distance receiving coil is designed to be
Figure BDA0002704315850000085
At the moment, the induced voltages generated by the i-th harmonic magnetic field in the receiving coil are mutually offset, the voltage in the receiving coil is generated only by the fundamental wave magnetic field, and the output voltage of the system is constant in the moving process of the receiving end.
When the magnetic field generated by the single-phase transmitting coil only contains 5 th harmonic component and 7 th harmonic component, the length of the short-distance receiving coil is designed to be 5 tau/6, and the short-distance receiving coil can simultaneously inhibit the induced voltage generated by the 5 th harmonic magnetic field and the 7 th harmonic magnetic field in the receiving coil, so that the purpose of inhibiting the fluctuation of the output voltage of the system is realized; similarly, when the magnetic field generated by the single-phase transmitting coil only contains i-th harmonic component and i +2 th harmonic component at the same time, the length of the short-distance receiving coil is designed to be
Figure BDA0002704315850000091
At the moment, the short-distance receiving coil can simultaneously restrain the induced voltage generated by the i-th harmonic magnetic field and the i + 2-th harmonic magnetic field in the receiving coil, and the purpose of restraining the fluctuation of the output voltage of the system is achieved.
The short-range receiving coil of the present invention can be used in conjunction with a receiving end plate core, as shown in fig. 11. The flat-plate receiving end magnetic core is made of ferrite materials, is laid right above the short-distance receiving coil and is used for restricting the direction of magnetic lines and shielding a leakage magnetic field; the size of the flat-plate type receiving end magnetic core is larger than or equal to that of the short-distance receiving coil.
The short-range receiving coil of the present invention can be used in a plurality of series-connected receiving coils, as shown in fig. 12. When the output voltage of a single short-distance receiving coil cannot meet the requirements of a system, a plurality of short-distance receiving coils can be connected in series and then used together, wherein the sizes of the plurality of short-distance receiving coils are completely the same, and two adjacent short-distance receiving coils can be placed together in a close fit manner or at a certain distance; because the single short-distance receiving coil eliminates the induced voltage generated by the harmonic magnetic field component in the coil, after the plurality of short-distance receiving coils are used in series, the total output voltage of the receiving end does not contain the harmonic induced voltage component, and the total output voltage of the system can be kept constant in the moving process of the receiving end.
The method for suppressing the fluctuation of the output voltage of the three-phase dynamic wireless power supply system based on the short-distance receiving coil is introduced in detail, a specific example is applied in the method for suppressing the fluctuation of the output voltage of the three-phase dynamic wireless power supply system based on the short-distance receiving coil to explain the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims (6)

1. A three-phase dynamic wireless power supply system output voltage fluctuation suppression method based on a short-distance receiving coil is characterized by specifically comprising the following steps:
step 1: the transmitting end device of the three-phase dynamic wireless power supply system adopts a three-phase transmitting coil, and three-phase symmetrical high-frequency alternating current is introduced into each phase of transmission; obtaining the magnetic field distribution generated by the single-phase transmitting coil on the receiving end plane in a magnetic field analytical calculation or finite element simulation mode;
step 2: the magnetic field generated by the single-phase transmitting coil is subjected to Fourier decomposition, fundamental wave components and higher harmonic components in the magnetic field are determined, and the magnetic poles generated by the transmitting coil are N poles and S poles are distributed in a staggered manner along the traveling direction, so that the harmonic magnetic field only contains odd-order components;
and step 3: the length of the short-distance receiving coil is designed based on harmonic components in a magnetic field generated by the single-phase transmitting coil, and the induction voltage generated by the harmonic magnetic field in the receiving coil can be eliminated by designing the length of the short-distance receiving coil, so that the purpose of inhibiting the fluctuation of the output voltage in the dynamic power supply process is achieved.
2. The method of claim 1, wherein: the design principle of the short-distance receiving coil is as follows:
(1) 3-order harmonic magnetic fields generated by the three-phase transmitting coil can be mutually offset in space, so that the 3-order harmonic magnetic fields have no influence on the fluctuation of output voltage; when the magnetic field generated by the single-phase transmitting coil only contains 5-order harmonic component, the length of the short-distance receiving coil is designed to be 4 tau/5, wherein tau is the polar distance of the transmitting end, the induced voltages generated by the 5-order harmonic magnetic field in the receiving coil are mutually counteracted, the voltage in the receiving coil is only generated by the fundamental wave magnetic field, and in the moving process of the receiving end, the amplitude of the induced voltage generated by the fundamental wave magnetic field is unchanged, and the output voltage of the system is constant;
(2) when the magnetic field generated by the single-phase transmitting coil only contains 7-th harmonic component, the length of the short-distance receiving coil is designed to be 6 tau/7; similarly, when the magnetic field generated by the single-phase transmitting coil only contains i-th harmonic component, where i is 5,7,9,11 … …, the length of the short-distance receiving coil is designed to be equal to
Figure FDA0002704315840000011
At the moment, the induced voltages generated by the i-th harmonic magnetic field in the receiving coil are mutually offset, the induced voltage in the receiving coil is only generated by the fundamental wave magnetic field, and the output voltage of the system is constant in the moving process of the receiving end;
(3) when the magnetic field generated by the single-phase transmitting coil only contains 5 th harmonic component and 7 th harmonic component, the length of the short-distance receiving coil is designed to be 5 tau/6, and the short-distance receiving coil can simultaneously inhibit harmonic induction voltage generated by the 5 th harmonic magnetic field and the 7 th harmonic magnetic field in the receiving coil, so that the purpose of inhibiting the fluctuation of the output voltage of the system is realized; similarly, when the magnetic field generated by the single-phase transmitting coil only contains i-th harmonic component and i +2 th harmonic component at the same time, the length of the short-distance receiving coil is designed to be
Figure FDA0002704315840000012
At the moment, the short-distance receiving coil can simultaneously restrain the induced voltage generated by the i-th harmonic magnetic field and the i + 2-th harmonic magnetic field in the receiving coil, and the purpose of restraining the fluctuation of the output voltage of the system is achieved.
3. The method of claim 2, wherein: the short-distance receiving coil is a rectangular coil with the length of lcoilWidth of rectangular coil is wcoilFor the purpose of suppressing output voltage fluctuation, the rectangular coil length lcoilAccording to the higher harmonic component in the magnetic field generated by the single-phase transmitting coil; width w of rectangular coilcoilOnly the amplitude of the induced voltage in the receiving coil is influenced, and the induced voltage generated by the harmonic magnetic field is not inhibited, so that the width w of the coil is changedcoilOnly the amplitude of the output voltage of the system is influenced, and the fluctuation of the output voltage of the system is not influenced; the width w of the rectangular coilcoilAccording to the transmission power required by the system.
4. The method of claim 3, wherein: the short-distance receiving coils are wound by litz wires or stranded enameled wires insulated from each other, and the number of turns of the short-distance receiving coils is NSIn which N isSIs a positive integer and is determined according to the transmission power required by the system.
5. The method of claim 4, wherein: the short-distance receiving coil is matched with a flat plate type receiving end magnetic core for use, and the flat plate type receiving end magnetic core is made of ferrite materials and is laid right above the short-distance receiving coil and used for restricting the direction of a magnetic line and shielding a leakage magnetic field; the size of the flat receiving end magnetic core is larger than or equal to that of the short-distance receiving coil.
6. The method of claim 5, wherein: a plurality of short-distance receiving coils are used in series; the sizes of the plurality of short-distance receiving coils connected in series are completely the same, and two adjacent short-distance receiving coils can be placed closely together or at a certain distance.
CN202011032848.4A 2020-09-27 2020-09-27 Output voltage fluctuation suppression method for three-phase dynamic wireless power supply system Active CN114274801B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011032848.4A CN114274801B (en) 2020-09-27 2020-09-27 Output voltage fluctuation suppression method for three-phase dynamic wireless power supply system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011032848.4A CN114274801B (en) 2020-09-27 2020-09-27 Output voltage fluctuation suppression method for three-phase dynamic wireless power supply system

Publications (2)

Publication Number Publication Date
CN114274801A true CN114274801A (en) 2022-04-05
CN114274801B CN114274801B (en) 2023-10-13

Family

ID=80867693

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011032848.4A Active CN114274801B (en) 2020-09-27 2020-09-27 Output voltage fluctuation suppression method for three-phase dynamic wireless power supply system

Country Status (1)

Country Link
CN (1) CN114274801B (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150084406A1 (en) * 2012-04-23 2015-03-26 Bombardier Transportation Gmbh Arrangement and Method for Providing a Vehicle with Electric Energy by Magnetic Induction
CN106208420A (en) * 2016-09-14 2016-12-07 东南大学 A kind of reception power low fluctuation electric automobile segmentation dynamic radio electric power system
CN106427640A (en) * 2016-10-28 2017-02-22 武汉大学 Distributed energy source and electric vehicle wireless power supply integrated system based on magnetic resonance coupling technology
US20180115196A1 (en) * 2016-10-21 2018-04-26 Panasonic Intellectual Property Management Co., Ltd. Mobile vehicle and wireless power transfer system
CN110843561A (en) * 2019-12-18 2020-02-28 吉林大学 Magnetic resonance type wireless charging integrated device for electric automobile and control method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150084406A1 (en) * 2012-04-23 2015-03-26 Bombardier Transportation Gmbh Arrangement and Method for Providing a Vehicle with Electric Energy by Magnetic Induction
CN106208420A (en) * 2016-09-14 2016-12-07 东南大学 A kind of reception power low fluctuation electric automobile segmentation dynamic radio electric power system
US20180115196A1 (en) * 2016-10-21 2018-04-26 Panasonic Intellectual Property Management Co., Ltd. Mobile vehicle and wireless power transfer system
CN106427640A (en) * 2016-10-28 2017-02-22 武汉大学 Distributed energy source and electric vehicle wireless power supply integrated system based on magnetic resonance coupling technology
CN110843561A (en) * 2019-12-18 2020-02-28 吉林大学 Magnetic resonance type wireless charging integrated device for electric automobile and control method thereof

Also Published As

Publication number Publication date
CN114274801B (en) 2023-10-13

Similar Documents

Publication Publication Date Title
Villa et al. High-misalignment tolerant compensation topology for ICPT systems
Cai et al. Design and optimization of load-independent magnetic resonant wireless charging system for electric vehicles
Huang et al. Modular on-road AGV wireless charging systems via interoperable power adjustment
Takanashi et al. A large air gap 3 kW wireless power transfer system for electric vehicles
CN103370851B (en) Contactless power supply device
US10530178B2 (en) Bi-plane wireless power transmission pad
Matsumoto et al. Trifoliate three-phase contactless power transformer in case of winding-alignment
CN105229890A (en) Two-way contactless power supply device
Kaneko et al. Technology trends of wireless power transfer systems for electric vehicle and plug-in hybrid electric vehicle
Kishan et al. Wireless power transfer technologies for electric vehicle battery charging—A state of the art
Shimizu et al. A new he core transmitter of a contactless power transfer system that is compatible with circular core receivers and H-shaped core receivers
Cui et al. A narrow-width three phase magnetic coupling mechanism with constant output power for electric vehicles dynamic wireless charging
Rakhymbay et al. A simulation study on four different compensation topologies in EV wireless charging
Cai et al. Improved coplanar couplers based WPT systems for adaptive energy harvesting on power towers
Ahmad et al. Comparative analysis of power pad for wireless charging of electric vehicles
Jeong et al. DQ-quadrature power supply coil sets with large tolerances for wireless stationary EV chargers
Shehata Design of high efficiency low frequency wireless power transfer system for electric vehicle charging
Masuda et al. Improvement of transmission efficiency on inductive Wireless Power Transfer at a middle distance
Liang et al. Emerging wireless charging systems for electric vehicles-achieving high power transfer efficiency: a review
Yamada et al. Design method of coreless coil considering power, efficiency and magnetic field leakage in wireless power transfer
Joseph et al. Design and simulation of wireless power transfer for electric vehicle
Yamanaka et al. 10 kW contactless power transfer system for rapid charger of electric vehicle
CN113904460A (en) Wireless energy receiving device and multistage guide rail type wireless energy transmission system
CN114274801B (en) Output voltage fluctuation suppression method for three-phase dynamic wireless power supply system
Gao et al. Uniform-gain frequency tracking of wireless EV charging for improving alignment flexibility

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant