CN113470943B - Electromagnetic induction type electricity taking device based on direct current ripple - Google Patents
Electromagnetic induction type electricity taking device based on direct current ripple Download PDFInfo
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- CN113470943B CN113470943B CN202110766903.0A CN202110766903A CN113470943B CN 113470943 B CN113470943 B CN 113470943B CN 202110766903 A CN202110766903 A CN 202110766903A CN 113470943 B CN113470943 B CN 113470943B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F30/00—Fixed transformers not covered by group H01F19/00
- H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
- H01F30/16—Toroidal transformers
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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
- H02J11/00—Circuit arrangements for providing service supply to auxiliaries of stations in which electric power is generated, distributed or converted
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
The invention discloses an electromagnetic induction type electricity taking device based on direct current ripples, which comprises an electricity taking circuit, wherein the electricity taking circuit comprises a rectifying circuit, a filter circuit, a voltage stabilizing circuit and a protection circuit; the power taking coil of the power taking iron core is connected with the rectifying circuit; the rectifying circuit is connected with the filter circuit; the filter circuit is connected with the voltage stabilizing circuit; the voltage stabilizing circuit is connected with the protection circuit; the protection circuit outputs a direct current power supply; the problem that a stable magnetic field is formed near a direct-current transmission line is solved, and the monitoring device in the prior art is infeasible to adopt an electromagnetic induction electricity taking method for power supply; the methods of photovoltaic power taking, energy storage battery and the like have the problems of unstable output, short sustainable time, need of replacement and the like.
Description
Technical Field
The invention belongs to the technical field of electromagnetic induction power taking of direct-current transmission lines, and particularly relates to an electromagnetic induction type power taking device based on direct-current ripples.
Background
The online monitoring of the power transmission line can carry out multi-aspect intelligent monitoring on important lines in remote areas in a non-artificial mode, improves the early warning performance of the power grid, and is important to building strong intelligent power grids. However, the online monitoring device needs to supply power, cannot directly get power from a line, and needs to get power through other power supplies, so that online monitoring is realized.
The current common power transmission line energy taking method mainly comprises the following steps: electromagnetic induction power taking, photovoltaic power taking and energy storage batteries, wherein the electromagnetic induction power taking is more stable and more widely applied because of the power taking. For a direct current transmission line, a stable magnetic field is formed near the line, and an electromagnetic induction electricity taking method is not feasible. The methods of photovoltaic power taking, energy storage battery and the like have the problems of unstable output, short sustainable time, need of replacement and the like.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the electromagnetic induction type electricity taking device based on the direct current ripple is provided, so that the problem that a stable magnetic field is formed near a direct current transmission line is solved, and the monitoring device in the prior art cannot adopt an electromagnetic induction electricity taking method for power supply; the methods of photovoltaic power taking, energy storage battery and the like have the problems of unstable output, short sustainable time, need of replacement and the like.
The technical scheme of the invention is as follows:
an electromagnetic induction type electricity taking device based on direct current ripples comprises an electricity taking circuit, wherein the electricity taking circuit comprises a rectifying circuit, a filter circuit, a voltage stabilizing circuit and a protection circuit; the power taking coil of the power taking iron core is connected with the rectifying circuit; the rectifying circuit is connected with the filter circuit; the filter circuit is connected with the voltage stabilizing circuit; the voltage stabilizing circuit is connected with the protection circuit; the protection circuit outputs a direct current power supply.
The energy taking iron core comprises an iron core, an energy taking coil and a reverse coil; the electricity taking coil and the reverse coil are respectively wound on the iron core; the reverse coil is in short circuit connection; the output end of the power taking coil is connected with the input end of the rectifying circuit.
The energy-taking iron core is composed of non-oriented silicon steel strips with low magnetic conductance and high magnetic flux density, the maximum thickness of the strips is not more than 0.2mm, the maximum direct current relative magnetic permeability is not higher than 15000, and the saturation magnetic flux density is not lower than 2.03T.
The energy taking iron core is a non-closed iron core; the air gap interval is 1-2mm; the iron core is in the shape of a C ring, a circular ring or an elliptical ring.
The method for determining the parameters of the energy-taking iron core comprises the following steps: firstly, the minimum effective section of the energy-taking iron core is determinedSFurther determining the minimum effective magnetic path length of the iron corelGo forward toDetermining the inner diameter of the energy-taking iron core according to the size of the wire of the power transmission linerOuter diameter of the steel pipeRAnd thicknesshSo that the core itself does not enter the saturation state under the maximum operating current condition.
Number of turns of power-taking coilN 2 From minimum output powerP 2 Effective cross sectionSMaximum operating current ripple componentI 1 ’ Effective magnetic path lengthlDetermined by the number of turnsN 2 And maximum operating current ripple componentI 1 ’ Jointly determining; the wire diameter of the reverse coil is the same as that of the electricity-taking coil, and the number of turns of the reverse coil is the same as that of the electricity-taking coilN 3 Is 1/2 N 2 Thereby reducing the magnetomotive force of the main magnetic circuit and preventing the saturation of the iron core.
The electromagnetic induction type electricity taking device is mechanically and electrically protected through cured epoxy resin, and finally the electromagnetic induction type electricity taking device is fixed on a direct current transmission line conductor.
The method for fixing the electromagnetic induction type electricity taking device on the direct current transmission line wire comprises the following steps: the energy taking iron core is a non-closed iron core, two parts of the energy taking iron core are respectively fixed in the insulating shell, the output end of the power taking coil is connected with a power taking circuit, and two outgoing lines are designed on the insulating shell and connected with a power supply target; the installation position of the electricity taking device is determined according to requirements during installation, the two parts of insulating shells are aligned and then fixed on a power transmission line through the hoops, and the outgoing lines are connected to a power supply target to achieve online electricity taking on the direct current line.
The voltage stabilizing circuit comprises a DC-DC voltage reducing chip.
The invention has the beneficial effects that:
because of the twelve-pulse rectification mode, about 5% of odd harmonics (mainly 3, 5 and 12K +/-1 times, 11, 13, 23, 25, 35, 37, 47 and 49 times of harmonics) exist on a common direct current transmission line, the invention adopts electric energy with required power taken out of the harmonics to provide a stable power supply for an online monitoring device, and the output power range is as follows: 5W to 50W, output voltage grades include the common: 5V, 12V and 24V, and the specific parameters are determined by the requirements of an on-line monitoring device.
The invention directly takes electricity from the direct current transmission line; the power supply of the on-line monitoring device of the direct current transmission line is realized, so that the on-line monitoring device can work stably, the monitoring capability of the direct current transmission line is greatly improved, the workload of manual inspection is reduced, the stability of the direct current line is improved, the situation that potential safety hazards of the direct current line cannot be eliminated due to insufficient monitoring equipment is reduced, and economic loss and social influence caused by the potential safety hazards of the direct current line are avoided.
The problem that a stable magnetic field is formed near a direct-current transmission line is solved, and the monitoring device in the prior art cannot be used for supplying power by adopting an electromagnetic induction power-taking method; the methods of photovoltaic power taking, energy storage battery and the like have the problems of unstable output, short sustainable time, need of replacement and the like.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of an energy-extracting core according to the present invention;
FIG. 3 is a schematic diagram of the package of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings, in which:
the invention includes:
the energy taking iron core and the coil are convenient to install, and the power taking circuit is used for rectification, filtering and voltage stabilization protection;
the available iron core in the prior art is mainly made of oriented silicon steel materials with high magnetic permeability and high magnetic flux, while the available iron core in the invention is mainly made of non-oriented silicon steel strips with low magnetic permeability and high magnetic flux density, the thickness of the strips is not more than 0.2mm at most, the maximum direct current relative magnetic permeability is not higher than 15000, and the saturation magnetic flux density is not lower than 2.03T, so that the design requirement of the invention is met;
the energy-taking iron core adopts the non-closed iron core, so that the energy-taking iron core is convenient to install on a power transmission line, a magnetic circuit air gap can be increased, the air gap interval is about 1-2mm, the magnetic circuit reluctance is effectively increased, the saturation condition of the iron core is reduced, and the appearance of the iron core can be divided into the following parts according to the actual condition: c ring, circular ring or elliptical ring to ensure the continuity of magnetic circuit;
the parameters (effective cross section and effective magnetic path length) of the energy-taking iron core of the invention are determined by the maximum running current of the applied direct current transmission lineI 1 And minimum output powerP 2 Determining the minimum effective cross section of the iron coreSFurther determining the minimum effective magnetic path length of the iron corelFurther determining the inner diameter of the energy-taking iron core according to the size of the wire of the power transmission linerOuter diameter ofRAnd thicknesshSo that the iron core can not enter a saturation state under the condition of the maximum running current, and the design of the energy-taking iron core is finished;
the coil on the energy-taking iron core is divided into two parts, as shown in fig. 3, one part is the energy-taking coil connected with the energy-taking circuit and used for transmitting harmonic current in a direct current transmission line to the energy-taking circuit in an isolation mode to provide an energy source for the energy-taking circuit, and the other part is the reverse coil connected with a short circuit and used for reducing a magnetic field induced by a direct current lead in the energy-taking iron core;
the invention obtains the number of turns of the electric coilN 2 From minimum output powerP 2 Effective cross sectionSMaximum operating current ripple componentI 1 ’ Effective magnetic path lengthlThe wire diameter is determined by the number of turnsN 2 And maximum operating current ripple componentI 1 ’ And (4) jointly determining. The wire diameter of the reverse coil is the same as that of the electricity-taking coil, and the number of turns of the reverse coil is the same as that of the electricity-taking coilN 3 Is 1/2 N 2 Thereby reducing the magnetomotive force of the main magnetic circuit and preventing the iron core from being saturated;
according to the invention, the electricity taking device is subjected to mechanical and electrical protection treatment through cured epoxy resin, and finally the whole body is fixed on a direct current transmission line conductor through a mechanical piece and a rubber pad, wherein the specific size of the electricity taking device is determined by the direct current transmission line conductor and the electricity taking device together, as shown in figure 3;
the method for fixing the electromagnetic induction type electricity taking device on the direct current transmission line wire comprises the following steps: the energy taking iron core is a non-closed iron core, two parts of the energy taking iron core are respectively fixed in the insulating shell, the output end of the energy taking coil is connected with an energy taking circuit, and two outgoing lines of an energy taking device are arranged on the shell and connected with a power supply target; during installation, the position of the power taking device is determined according to requirements, the two parts of shells are aligned and then fixed on a power transmission line through the hoops, and then the outgoing lines are connected to a power supply target, so that online power taking on a direct current line can be achieved.
Because of the twelve-pulse rectification mode, about 5% odd harmonics (mainly 3, 5 and 12K ± 1 times, 11, 13, 23, 25, 35, 37, 47 and 49 times harmonics) exist on a common direct-current transmission line, the electricity taking device can take out electric energy with required power from the harmonics, a stable power supply is provided for the online monitoring device, and the output power range is as follows: 5W to 50W, output voltage grades include the common: +/-5V, +/-12V and +/-24V, wherein specific parameters are determined by the requirements of an online monitoring device;
s9, the direct current ripple power-taking circuit is different from an alternating current power-taking circuit, and because the ripple frequency is high, the voltage of the secondary output of the direct current ripple power-taking circuit is higher after rectification and filtering, a DC-DC voltage reduction chip is also needed in a voltage stabilizing circuit, so that the target direct current voltage is output;
and S9, the power taking device can automatically and stably run after being installed, and does not influence a direct current circuit.
Generally, it is an industrial opinion that electromagnetic induction type power taking cannot be performed through a direct current transmission line, so that the energy supply mode of an online monitoring device of the direct current transmission line is single and unstable. However, in the dc transmission line, there is 5% dc ripple, i.e. there is a small high-order alternating magnetic field under a large dc steady magnetic field. The direct current ripple electricity taking device is installed on an overhead transmission line, the electricity taking device can reduce or even counteract the magnetic saturation effect of a direct current stable magnetic field through a reverse coil of an iron core under the combined action of the stable magnetic field generated by line direct current and an alternating magnetic field generated by ripples, voltage can be induced on the forward coil of the iron core, and the stable voltage with required power grade is finally output through power circuits such as rectification, filtering, voltage stabilization and the like to supply power for on-line monitoring equipment of the direct current transmission line.
Claims (5)
1. An electromagnetic induction type electricity taking device based on direct current ripples comprises an electricity taking circuit, wherein the electricity taking circuit comprises a rectifying circuit, a filter circuit, a voltage stabilizing circuit and a protection circuit; the method is characterized in that: the power taking coil of the power taking iron core is connected with the rectifying circuit; the rectifying circuit is connected with the filter circuit; the filter circuit is connected with the voltage stabilizing circuit; the voltage stabilizing circuit is connected with the protection circuit; the protection circuit outputs a direct current power supply; the energy taking iron core comprises an iron core, an energy taking coil and a reverse coil; the electricity taking coil and the reverse coil are respectively wound on the iron core; the reverse coil is in short circuit connection; the output end of the power taking coil is connected with the input end of the rectifying circuit; the energy taking iron core is a non-closed iron core; the air gap interval is 1-2mm; the iron core is in the shape of a C ring, a circular ring or an elliptical ring; the voltage stabilizing circuit comprises a DC-DC voltage reduction chip; the energy-taking iron core is composed of non-oriented silicon steel strips with low magnetic conductance and high magnetic flux density, the maximum thickness of the strips is not more than 0.2mm, the maximum direct current relative magnetic permeability is not higher than 15000, and the saturation magnetic flux density is not lower than 2.03T.
2. The electromagnetic induction type power taking device based on the direct current ripple as claimed in claim 1, wherein: the method for determining the parameters of the energy-taking iron core comprises the following steps: firstly, the minimum effective section of the energy-taking iron core is determinedSFurther determining the minimum effective magnetic path length of the iron corelFurther determining the inner diameter of the energy-taking iron core according to the size of the wire of the power transmission linerOuter diameter ofRAnd thicknesshSo that the core itself does not enter the saturation state under the maximum operating current condition.
3. The electromagnetic induction type power taking device based on the direct current ripple as claimed in claim 1, wherein: number of turns of power-taking coilN 2 From minimum output powerP 2 Effective cross sectionSMaximum operating current ripple componentI 1 ’ Effective magnetic path lengthlThe wire diameter is determined by the number of turnsN 2 And a maximum operating current ripple componentI 1 ’ Jointly determining; the wire diameter of the reverse coil is the same as that of the power-taking coil,number of turnsN 3 Is 1/2 N 2 Thereby reducing the magnetomotive force of the main magnetic circuit and preventing the iron core from being saturated.
4. The electromagnetic induction type power taking device based on the direct current ripple as claimed in claim 1, wherein: the electromagnetic induction type electricity taking device is mechanically and electrically protected through cured epoxy resin, and finally the electromagnetic induction type electricity taking device is fixed on a direct current transmission line conductor.
5. The electromagnetic induction type power taking device based on the direct current ripple as claimed in claim 1, wherein: the method for fixing the electromagnetic induction type electricity taking device on the direct current transmission line wire comprises the following steps: the energy taking iron core is a non-closed iron core, two parts of the energy taking iron core are respectively fixed in the insulating shell, the output end of the power taking coil is connected with a power taking circuit, and two outgoing lines are designed on the insulating shell and connected with a power supply target; the installation position of the electricity taking device is determined according to requirements during installation, the two parts of insulating shells are aligned and then fixed on a power transmission line through the hoops, and the outgoing lines are connected to a power supply target to achieve online electricity taking on the direct current line.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110766903.0A CN113470943B (en) | 2021-07-07 | 2021-07-07 | Electromagnetic induction type electricity taking device based on direct current ripple |
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| CN202110766903.0A CN113470943B (en) | 2021-07-07 | 2021-07-07 | Electromagnetic induction type electricity taking device based on direct current ripple |
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| CN113470943B true CN113470943B (en) | 2023-04-11 |
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| CN116545129A (en) * | 2023-07-04 | 2023-08-04 | 南方电网数字电网研究院有限公司 | Direct current line energy taking system and intelligent sensor |
| CN116599238B (en) * | 2023-07-18 | 2023-10-31 | 青岛鼎信通讯股份有限公司 | Modular fault indicator energy taking module and using method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102570855A (en) * | 2011-10-27 | 2012-07-11 | 江苏省电力公司连云港供电公司 | Power supply device for taking electricity from high-voltage side in induction manner |
| CN203850928U (en) * | 2014-05-26 | 2014-09-24 | 陈如燕 | Rechargeable type high-voltage induction power acquisition apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN204068435U (en) * | 2013-11-20 | 2014-12-31 | 国网河南省电力公司驻马店供电公司 | The direct electricity getting device of a kind of transmission line |
| CN204615516U (en) * | 2015-03-30 | 2015-09-02 | 国家电网公司 | The electric current induction electricity getting device that a kind of magnetic flux feedback regulates |
| CN105762907B (en) * | 2016-03-04 | 2018-03-27 | 国网山东省电力公司平原县供电公司 | Induction energy fetching device |
| CN112886718B (en) * | 2021-01-16 | 2022-10-14 | 国网福建省电力有限公司三明供电公司 | Resonance compensation type current transformer induction power taking system |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102570855A (en) * | 2011-10-27 | 2012-07-11 | 江苏省电力公司连云港供电公司 | Power supply device for taking electricity from high-voltage side in induction manner |
| CN203850928U (en) * | 2014-05-26 | 2014-09-24 | 陈如燕 | Rechargeable type high-voltage induction power acquisition apparatus |
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