CN114123535A - Wireless power transmission coupling mechanism for on-line monitoring equipment on extra-high voltage transmission line - Google Patents
Wireless power transmission coupling mechanism for on-line monitoring equipment on extra-high voltage transmission line Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/005—Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
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Abstract
On-line monitoring equipment is with wireless power transmission coupling mechanism on extra-high voltage transmission line, the mechanism main part includes: a transmitting end and a receiving end; the transmitting end comprises a first coil, a second coil and a transmitting end magnetic core which are connected in series, and the receiving end comprises a receiving coil and a receiving end magnetic core; the transmitting end magnetic core comprises a first magnetic core block, a second magnetic core block, a third magnetic core block, a fourth magnetic core block and a fifth magnetic core block; the second magnetic core block and the third magnetic core block have the same height, and the height of the second magnetic core block and the height of the third magnetic core block are lower than that of the first magnetic core block; the fourth and fifth magnetic core blocks have the same height, and the fourth and fifth magnetic core blocks have a height lower than that of the second and third magnetic core blocks. According to the invention, the internal structure of the transmitting end is optimized, and the uniformity of magnetic flux density distribution is improved, so that the utilization rate of the magnetic core of the wireless power transmission coupling mechanism is obviously improved, and the wireless power transmission coupling mechanism is more suitable for long-distance large-current wireless power transmission.
Description
Technical Field
The invention belongs to the technical field of wireless power transmission of space sensors, and particularly relates to a wireless power transmission coupling mechanism for an online monitoring device on an extra-high voltage transmission line.
Background
With the deep development of the national power industry, high-voltage, ultrahigh-voltage and even ultrahigh-voltage power transmission lines become the medium and strong power of power transmission. On-line monitoring equipment is usually installed on the high-voltage transmission line to feed back the state information of the transmission line in time. The on-line monitoring equipment for the high-voltage transmission line can perform all-directional and multifunctional real-time monitoring on the working state of the transmission line, and particularly under severe weather or external environment, because the monitoring information is fed back in real time by using the on-line monitoring equipment, the monitoring equipment is prevented from getting in the bud. However, with the popularization of the online monitoring technology, the power supply problem becomes one of the problems to be solved by the online monitoring equipment.
As a wireless power transmission technology in a novel power supply mode, a new energy acquisition mode is provided for the electronic equipment driven by electric power, so that the wireless power transmission technology has the advantages of high safety, high reliability, high degree of freedom and the like, and has great development potential in application scenes of electric vehicles, consumer electronics, smart homes and the like. The magnetic coupling resonance type wireless electric energy transmission technology converts electric energy into a high-frequency alternating electromagnetic field by using a transmitting end and transmits the electric energy to a receiving end in an air-spaced mode. The magnetic coupling resonant wireless power transmission is widely applied to the field of medium and long distance charging due to the long transmission distance and high power level. The magnetic coupler is a key link in the energy conversion of the magnetic coupling resonant wireless electric energy transmission, and the structure and parameter design of the magnetic coupler are directly related to the system performance. However, in the field of long-distance wireless power transmission, in order to adapt to a longer transmission distance and a larger transmission current, as represented by "method and apparatus for forming magnetic beam focusing by multiple transmitting coils in wireless power transmission" in prior art 1 (CN113644756A), centers of a plurality of transmitting coils are arranged according to an equilateral triangle to form a cancellation plane with a magnetic induction intensity of 0, and the distance between the transmitting coils is adjusted to compare the change of mutual inductance between the transmitting coils, so that when the mutual inductance between the transmitting coils is minimum, an optimal structure of a plurality of transmitting coil arrays is obtained. Through the optimal structure, magnetic field beams generated by the plurality of transmitting coils are converged to the receiving coil, so that the energy transmission efficiency can be improved to the maximum extent, and the aim of improving the wireless charging transmission distance is fulfilled. However, such a magnetic coupler has problems to be solved, such as a large size of the magnetic coupling mechanism and a low utilization rate of the core material.
In addition, for a long-distance wireless power transmission system, iron core saturation may occur when the primary current is large. As shown in fig. 1, a distribution diagram of the magnetic flux density inside a single transmitting coil magnetic core along the horizontal direction is shown, when a transmitting end has only one transmitting coil and the thickness of the magnetic core along a long side is uniform, the distribution of the magnetic flux density in the magnetic core along the long side is not uniform, and it can be known from finite element simulation results that the flux linkage at this time is concentrated below the coil, namely below the center of the magnetic core, the magnetic flux density is highest at the center of the magnetic core, the magnetic flux at the periphery of the magnetic core covered by the coil is rapidly reduced, and at this time, the magnetic core with the same thickness is still adopted at the edge of the magnetic core, so that the utilization rate of the magnetic core is low.
In summary, a wireless power transmission coupling mechanism for an online monitoring device suitable for remote transmission of a 500kV power transmission line needs to be researched.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide the wireless power transmission coupling mechanism for the on-line monitoring equipment on the extra-high voltage transmission line, and the internal structure of the transmitting end is optimized to improve the uniformity of magnetic flux density distribution, so that the magnetic core utilization rate of the wireless power transmission coupling mechanism is obviously improved, and the wireless power transmission coupling mechanism is more suitable for long-distance large-current wireless power transmission.
The invention adopts the following technical scheme.
The utility model provides an online monitoring equipment is with wireless power transmission coupling mechanism on extra-high voltage transmission line, the mechanism main part includes: a transmitting end and a receiving end; the transmitting end comprises a transmitting coil and a transmitting end magnetic core, and the receiving end comprises a receiving coil and a receiving end magnetic core.
In the wireless power transmission coupling mechanism provided by the invention, the transmitting coil comprises a first coil and a second coil which are connected in series;
the transmitting end magnetic core comprises a first magnetic core block, a second magnetic core block, a third magnetic core block, a fourth magnetic core block and a fifth magnetic core block;
the first coil is wound at one end of the first magnetic core block, and the second coil is wound at the other end of the first magnetic core block;
one end of the first magnetic core block is connected with one end of the second magnetic core block, and the other end of the second magnetic core block is connected with the fourth magnetic core block;
the other end of the first magnetic core block is connected with one end of a third magnetic core block, and the other end of the third magnetic core block is connected with a fifth magnetic core block;
the heights of the second magnetic core block and the third magnetic core block are the same, and are lower than that of the first magnetic core block; the fourth and fifth magnetic core blocks have the same height, and the fourth and fifth magnetic core blocks have a height lower than that of the second and third magnetic core blocks.
The first magnetic core block, the fourth magnetic core block and the fifth magnetic core block are provided with magnetic chips in a comb-shaped arrangement at equal intervals.
The magnetic chip is a ferrite sheet; the width of ferrite piece is 0.1 ~ 1cm, and the interval that comb tooth shape was arranged is the same with the width of ferrite piece.
The first coil and the second coil are the same in size and are both rectangular solenoid type coils.
The first coil and the second coil are formed by winding the same litz wire in the same direction.
The distance between the first coil and the second coil is 0.25-0.5L, wherein L is the total length of the transmitting end magnetic core.
The first magnetic core block is a cuboid ferrite strip, the length of the first magnetic core block is 0.25-0.5L, and L is the total length of the transmitting end magnetic core.
The second magnetic core block and the third magnetic core block are both cuboid ferrite strips; the second magnetic core block and the third magnetic core block are the same in length and are 0.25-0.1L; the second magnetic core block and the third magnetic core block have the same height and are 0.6-0.9H, wherein H is the height of the first magnetic core block.
The fourth magnetic core block and the fifth magnetic core block are both cuboid ferrite strips, and the lengths of the fourth magnetic core block and the fifth magnetic core block are the same and are both the lengths of the second magnetic core block and the third magnetic core block; the heights of the fourth magnetic core block and the fifth magnetic core block are the same and are 0.3-0.5H, wherein H is the height of the first magnetic core block.
The receiving end coil is of a flat solenoid type and is wound on the receiving end magnetic core.
Preferably, the receiving-end magnetic core includes a rectangular parallelepiped shape.
Compared with the prior art, the invention has the beneficial effects that the transmitting coil is divided into two parts which are connected in series, the comb-shaped ferrite sheet is added in the middle of the coil, the stepped magnetic core is arranged outside the coil, and the comb-shaped ferrite sheet is arranged on the second step, so that the magnetic flux density in the ferrite at the transmitting end is uniformly distributed, the magnetic core at the transmitting end is prevented from being saturated, the utilization rate of the magnetic core at the transmitting end is improved, and the invention is suitable for a wireless electric energy transmission system with long-distance large current.
Drawings
FIG. 1 is a diagram of the magnetic flux density inside a single transmitting coil core along the horizontal direction;
FIG. 2 is a schematic diagram of a wireless power transmission coupling mechanism for an on-line monitoring device on an ultra-high voltage transmission line according to the present invention;
FIG. 3 is a schematic diagram of a transmitting end in an embodiment of the invention;
FIG. 4 is a diagram of a receiving end according to an embodiment of the present invention;
the reference numerals in fig. 2 to 4 are explained as follows:
1-a transmitting coil; 1 a-a first coil; 1 b-a second coil;
2-a transmitting end magnetic core; 21-a first magnetic core block; 22-a second magnetic core block; 23-a third magnetic core block; 24-a fourth magnetic core block; 25-a fifth magnetic core block;
3-a receiving coil; 4-a receiving end magnetic core; 5-a magnetic chip;
l-the total length of the transmitting end magnetic core, which is also the total length of the receiving end magnetic core;
FIG. 5 is a schematic diagram showing a comparison of magnetic flux density distribution within a magnetic core of a single transmitting coil and two-segment series transmitting coils in accordance with a preferred embodiment of the present invention;
fig. 6 is a schematic diagram showing the comparison of the magnetic flux density distribution inside the magnetic core of a single transmitting coil, two-segment series transmitting coils and the transmitting coil according to the present invention in the preferred embodiment of the present invention.
Detailed Description
The present application is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present application is not limited thereby.
As shown in fig. 2, a wireless power transmission coupling mechanism for on-line monitoring equipment on 500kV power transmission line, the mechanism main body includes: a transmitting end and a receiving end; the transmitting end comprises a transmitting coil 1 and a transmitting end magnetic core 2, and the receiving end comprises a receiving coil 3 and a receiving end magnetic core 4.
In the preferred embodiment of the invention, the transmission distance of the wireless power transmission coupling mechanism is 4-5L, wherein L is the total length of the transmitting end magnetic core 2. In the preferred embodiment of the present invention, L is also the overall length of the receiving end core 4.
As shown in fig. 3, in the wireless power transmission coupling mechanism provided by the present invention, the transmitting coil 1 includes a first coil 1a and a second coil 1b connected in series;
the transmitting end magnetic core 2 comprises a first magnetic core block 21, a second magnetic core block 22, a third magnetic core block 23, a fourth magnetic core block 24 and a fifth magnetic core block 25;
the first coil 1a is wound at one end of the first magnetic core block 21, and the second coil 1b is wound at the other end of the first magnetic core block 21;
one end of the first magnetic core block 21 is connected with one end of the second magnetic core block 22, and the other end of the second magnetic core block 22 is connected with the fourth magnetic core block 24;
the other end of the first magnetic core block 21 is connected with one end of the third magnetic core block 23, and the other end of the third magnetic core block 23 is connected with the fifth magnetic core block 25;
wherein, the second magnetic core block 22 and the third magnetic core block 23 have the same height, and the second magnetic core block 22 and the third magnetic core block 23 have a height lower than that of the first magnetic core block 21; the fourth and fifth magnetic core blocks 24 and 25 have the same height, and the fourth and fifth magnetic core blocks 24 and 25 have a height lower than that of the second and third magnetic core blocks 22 and 23.
The magnetic core pieces 5 are arranged in a comb-like shape at equal intervals on the first, fourth, and fifth magnetic core pieces 21, 24, and 25.
The magnetic chip 5 is a ferrite sheet; the width of ferrite piece is 0.1 ~ 1cm, and the interval that the comb tooth was arranged is the same with the width of ferrite piece.
The first coil 1a and the second coil 1b are the same in size and are both rectangular solenoid type coils.
The first coil 1a and the second coil 1b are formed by winding the same litz wire in the same direction.
The distance between the first coil 1a and the second coil 1b is 0.25-0.5L, wherein L is the total length of the transmitting end magnetic core 2. In the preferred embodiment of the present invention, L is also the total length of the receiving end core 4.
The first magnetic core block 21 is a rectangular ferrite strip with a length of 0.25-0.5L, wherein L is the total length of the transmitting end magnetic core 2. In the preferred embodiment of the present invention, L is also the total length of the receiving end core 4.
It is to be noted that, in the preferred embodiment of the present invention, the length of the first magnetic core block is a non-limiting preferred choice, and those skilled in the art can design the length of the first magnetic core block according to practical situations.
The second magnetic core block 22 and the third magnetic core block 23 are both cuboid ferrite strips; the second magnetic core block 22 and the third magnetic core block 23 are the same in length and are 0.25-0.1L; the second magnetic core block 22 and the third magnetic core block 23 have the same height, which is 0.6-0.9H, wherein H is the height of the first magnetic core block 21. In the preferred embodiment of the present invention, H is also the height of the receiving end core 4.
It should be noted that, in the preferred embodiment of the present invention, the lengths of the second and third magnetic core blocks and the heights of the second and third magnetic core blocks are non-limiting preferred choices, and those skilled in the art can design the lengths and heights of the second and third magnetic core blocks according to practical situations.
The fourth magnetic core block 24 and the fifth magnetic core block 25 are both rectangular ferrite strips, and the lengths of the fourth magnetic core block 24 and the fifth magnetic core block 25 are the same and are both the lengths of the second magnetic core block 22 and the third magnetic core block 23; the heights of the fourth magnetic core block 24 and the fifth magnetic core block 25 are the same and are 0.3-0.5H, wherein H is the height of the first magnetic core block 21. In the preferred embodiment of the invention, H is also the height of the receiving end core 4.
It should be noted that, in the preferred embodiment of the present invention, the lengths of the fourth and fifth magnetic core blocks and the heights of the fourth and fifth magnetic core blocks are non-limiting preferred choices, and those skilled in the art can design the lengths and heights of the fourth and fifth magnetic core blocks according to actual situations.
As shown in fig. 4, the receiving-end coil 3 is of a flat solenoid type and is wound around the receiving-end core 4.
Preferably, the receiving-end magnetic core 3 includes a rectangular parallelepiped shape. In fact, there is no limitation on the shape of the receiving-end magnetic core 3.
Based on the above analysis, in order to prevent the iron core from being saturated, the magnetic flux spikes generated below the single transmitting coil need to be reduced, the invention adopts a mode that two transmitting coils are connected in series in the same direction as the transmitting source, as shown in fig. 5, the magnetic flux density inside the magnetic core of the single transmitting coil and the two transmitting coils connected in series is distributed along the horizontal direction, and as can be seen from the figure, the two transmitting coils connected in series are adopted to enable the magnetic field to form two lower magnetic flux spikes in the magnetic core, which are respectively arranged below the coils, so that the magnetic flux spikes in the magnetic core are effectively reduced, and the effect of preventing the magnetic core from being saturated is achieved.
As can be seen from fig. 6, when two series-connected transmitting coils are used, the magnetic flux in the core between the two coils drops, which is more obvious when the length of the core is much longer than that of the coil, and the magnetic flux density at the edge of the core is small, so that the core needs to be optimally designed. As shown in fig. 3, which is a comparison graph of the distribution effect of the magnetic flux density in the magnetic core at the transmitting end of the two designs, it can be seen from the above analysis that the thickness of the magnetic core can be adjusted according to the magnetic flux density, the height of the magnetic core between the coils is reduced, and in order to increase the magnetic flux density between the coils to be consistent with the magnetic flux peak generated in the magnetic core by the two series-connected transmitting coils, the magnetic sheet in the shape of a comb tooth is added on the magnetic core between the coils. At the magnetic core edge, make magnetic core edge magnetic linkage gathering through reducing the magnetic core height simultaneously add broach form magnetic sheet, improve magnetic core edge magnetic flux density, make the interior whole magnetic flux distribution of magnetic core even, reduced the quantity of magnetic core, reduce cost adopts the broach form magnetic sheet to compare in the magnetic block more to do benefit to the heat dissipation simultaneously, reduces the magnetic core loss, improves system's efficiency.
Compared with the prior art, the invention has the beneficial effects that the transmitting coil is divided into two parts which are connected in series, the comb-shaped ferrite sheet is added in the middle of the coil, the stepped magnetic core is arranged outside the coil, and the comb-shaped ferrite sheet is arranged on the second step, so that the magnetic flux density in the ferrite at the transmitting end is uniformly distributed, the magnetic core at the transmitting end is prevented from being saturated, the utilization rate of the magnetic core at the transmitting end is improved, and the invention is suitable for a wireless electric energy transmission system with long-distance large current.
The present applicant has described and illustrated embodiments of the present invention in detail with reference to the accompanying drawings, but it should be understood by those skilled in the art that the above embodiments are merely preferred embodiments of the present invention, and the detailed description is only for the purpose of helping the reader to better understand the spirit of the present invention, and not for limiting the scope of the present invention, and on the contrary, any improvement or modification made based on the spirit of the present invention should fall within the scope of the present invention.
Claims (11)
1. On-line monitoring equipment is with wireless power transmission coupling mechanism on extra-high voltage transmission line, the mechanism main part includes: a transmitting end and a receiving end; the transmitting end comprises a transmitting coil and a transmitting end magnetic core, the receiving end comprises a receiving coil and a receiving end magnetic core, the device is characterized in that,
the transmitting coil comprises a first coil and a second coil which are connected in series;
the transmitting end magnetic core comprises a first magnetic core block, a second magnetic core block, a third magnetic core block, a fourth magnetic core block and a fifth magnetic core block;
the first coil is wound at one end of the first magnetic core block, and the second coil is wound at the other end of the first magnetic core block;
one end of the first magnetic core block is connected with one end of the second magnetic core block, and the other end of the second magnetic core block is connected with the fourth magnetic core block;
the other end of the first magnetic core block is connected with one end of a third magnetic core block, and the other end of the third magnetic core block is connected with a fifth magnetic core block;
the second magnetic core block and the third magnetic core block have the same height, and the height of the second magnetic core block and the height of the third magnetic core block are lower than that of the first magnetic core block; the fourth and fifth magnetic core blocks have the same height, and the fourth and fifth magnetic core blocks have a height lower than that of the second and third magnetic core blocks.
2. The wireless power transmission coupling mechanism for the ultra-high voltage transmission line on-line monitoring equipment according to claim 1,
the first magnetic core block, the fourth magnetic core block and the fifth magnetic core block are provided with magnetic chips in a comb-shaped arrangement at equal intervals.
3. The wireless power transmission coupling mechanism for the ultra-high voltage transmission line on-line monitoring device according to claim 2,
the magnetic chip is a ferrite sheet; the width of ferrite piece is 0.1 ~ 1cm, and the interval that comb tooth shape was arranged is the same with the width of ferrite piece.
4. The wireless power transmission coupling mechanism for the ultra-high voltage transmission line on-line monitoring equipment according to claim 1,
the first coil and the second coil are the same in size and are both rectangular solenoid type coils.
5. The wireless power transmission coupling mechanism for the ultra-high voltage transmission line on-line monitoring equipment according to claim 1 or 4,
the first coil and the second coil are formed by winding the same litz wire in the same direction.
6. The wireless power transmission coupling mechanism for the ultra-high voltage transmission line on-line monitoring equipment according to claim 4,
the distance between the first coil and the second coil is 0.25-0.5L, wherein L is the total length of the transmitting end magnetic core.
7. The wireless power transmission coupling mechanism for the on-line monitoring device on the extra-high voltage transmission line according to any one of claims 1 to 3,
the first magnetic core block is a cuboid ferrite strip, the length of the first magnetic core block is 0.25-0.5L, and L is the total length of the transmitting end magnetic core.
8. The wireless power transmission coupling mechanism for the on-line monitoring device on the extra-high voltage transmission line according to any one of claims 1 to 3,
the second magnetic core block and the third magnetic core block are both cuboid ferrite strips; the second magnetic core block and the third magnetic core block are the same in length and are 0.25-0.1L; the second magnetic core block and the third magnetic core block have the same height and are 0.6-0.9H, wherein H is the height of the first magnetic core block.
9. The wireless power transmission coupling mechanism for the on-line monitoring device on the extra-high voltage transmission line according to any one of claims 1 to 3,
the fourth magnetic core block and the fifth magnetic core block are both cuboid ferrite strips, and the lengths of the fourth magnetic core block and the fifth magnetic core block are the same and are both the lengths of the second magnetic core block and the third magnetic core block; the heights of the fourth magnetic core block and the fifth magnetic core block are the same and are 0.3-0.5H, wherein H is the height of the first magnetic core block.
10. The wireless power transmission coupling mechanism for the ultra-high voltage transmission line on-line monitoring equipment according to claim 1,
the receiving end coil is of a flat solenoid type and is wound on the receiving end magnetic core.
11. The wireless power transmission coupling mechanism for an extra-high voltage power transmission line on-line monitoring device of claim 10,
the receiving end magnetic core comprises a cuboid.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116566076A (en) * | 2023-04-26 | 2023-08-08 | 武汉大学 | Method and device for enhancing magnetic field energy taking of wine glass tower of ultrahigh-voltage alternating-current transmission line |
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