CN117728593B - Power supply method facing to coupling power supply of underwater observation equipment and underwater observation method - Google Patents
Power supply method facing to coupling power supply of underwater observation equipment and underwater observation method Download PDFInfo
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Abstract
A power supply method facing to coupling power supply of a submarine observation device and a submarine observation method. The power supply method comprises the following steps: dividing the undersea observation system into an offshore loop, an undersea load loop and an undersea loop, and establishing a circuit model of the undersea observation system based on the division; determining a supply voltage between the first conductor and the second conductor per unit length based on the insulation medium parameter of the cable and the distance between the first conductor and the second conductor; determining a first inductance and a first capacitance based on the supply voltage; determining the undersea equivalent impedance based on the first inductance, the first capacitance, the undersea loop, the undersea load loop, and the cable length corresponding to the undersea loop; and determining the frequency under the condition that the imaginary part of the undersea equivalent impedance is zero as a power supply frequency based on the undersea equivalent impedance and the cable lengths corresponding to the undersea loop, the undersea load loop and the undersea loop, and coupling power supply to the undersea observation equipment based on the power supply frequency.
Description
Technical Field
At least one embodiment of the invention relates to the technical field of transmission power supply, in particular to a power supply method for coupling power supply of undersea observation equipment and an undersea observation method.
Background
The cable system underwater observation system is an important means for underwater detection and underwater navigation communication. The undersea observation system does not need to add an extra loop node on the cable, and after the undersea observation equipment is hung on the cable, an electric loop can be formed based on the conductivity of the seawater. But in the process of supplying power to the underwater observation equipment by the energy supply device in the underwater observation system, partial electric energy is lost due to the action of seawater, so that the power supply to the underwater observation equipment is unfavorable to be more accurate, and the defects of low electric energy transmission efficiency and the like exist.
Disclosure of Invention
Aiming at the prior art, the invention provides a power supply method for coupling power supply of a submarine observation device and a submarine observation method, and the power supply efficiency of the submarine observation system can be improved by determining the power supply frequency of the submarine observation system.
The embodiment of the invention provides a power supply method for coupling power supply of a submarine observation device, which is suitable for a submarine observation system, wherein the submarine observation system comprises an energy supply device arranged above a water surface and the submarine observation device arranged below the sea, the energy supply device is connected with a cable, the cable is sleeved with a coupling device, the coupling device transmits electric energy output by the energy supply device to the submarine observation device based on electromagnetic induction and the conductivity of seawater, and the power supply method comprises the following steps: dividing the undersea observation system into an offshore loop, an undersea load loop and an undersea loop, and establishing a circuit model of the undersea observation system based on the division; determining a power supply voltage between a first conductor and a second conductor per unit length based on an insulating medium parameter of the cable and a distance between the first conductor and the second conductor, wherein the first conductor is a conductive part of the cable, and the second conductor is sea water; determining a first inductance and a first capacitance based on the supply voltage, wherein the first inductance is characterized by a total inductance produced by the first conductor and the second conductor per unit length, and the first capacitance is characterized by a total capacitance produced by the first conductor and the second conductor per unit length; determining an undersea equivalent impedance based on the first inductance, the first capacitance, and the cable lengths corresponding to the undersea loop, the undersea load loop, and the undersea loop, the undersea equivalent impedance being characterized as an impedance of a portion below the surface of the undersea observation system; and determining the frequency under the condition that the imaginary part of the undersea equivalent impedance is zero as a power supply frequency based on the undersea equivalent impedance and the cable lengths corresponding to the undersea loop, the undersea load loop and the undersea loop, and coupling power supply to the undersea observation equipment based on the power supply frequency.
Optionally, the circuit model includes: an energy supply module; the first module comprises a first parasitic resistor and a first parasitic inductor which are connected in series with the energy supply module, and a first distributed capacitor and a second distributed capacitor which are connected in parallel with the energy supply module; a second module, comprising: the device comprises a second parasitic resistor and a second parasitic inductor which are connected in series with the energy supply module, and a third distributed capacitor, a fourth distributed capacitor and a medium resistor which are connected in parallel with the energy supply module, wherein the medium resistor is characterized by the resistance of seawater; a third module, comprising: a first coupling resistor and a first coupling inductor connected in series with the energy supply module, a second coupling inductor coupled with the first coupling inductor, and a second coupling resistor and a load resistor connected in series with the second coupling inductor.
Optionally, the first module, the second module, and the third module are respectively characterized by a circuit condition of an offshore loop, an undersea loop, and an undersea load loop, and the capacitance values of the first distributed capacitance, the second distributed capacitance, the third distributed capacitance, and the fourth distributed capacitance, and the inductance values of the first parasitic inductance and the second parasitic inductance are respectively determined based on the first inductance, the first capacitance, and a ratio of a cable length to a unit length of the offshore loop, the undersea loop, and the undersea load loop.
Optionally, determining the undersea equivalent impedance based on the first inductance, the first capacitance, and the cable length corresponding to the undersea loop, the undersea load loop, and the undersea loop includes: determining an equivalent impedance of the undersea observation device and the coupling device based on the first inductance, the first capacitance, and cable lengths corresponding to the undersea loop, the undersea load loop, and the undersea loop; the subsurface equivalent impedance is determined based on the subsurface observation device and the equivalent impedance of the coupling device.
Optionally, the equivalent impedance Z T of the below sea observation device and the coupling means is represented as follows:
；
Wherein R LT is the first coupling resistor, j is the imaginary part, ω is the power supply frequency, L T is the first coupling inductor, M is the mutual inductance between the first coupling inductor and the second coupling inductor, R Load is the load resistor, and R LR is the second coupling resistor.
Optionally, the determining the first inductance and the first capacitance based on the supply voltage includes: determining a first inductance based on the supply voltage; and determining the first capacitance according to the first inductance based on the insulating medium parameter and the mapping relation between the first inductance and the first capacitance.
Optionally, the first capacitance c is expressed as follows:
；
Wherein epsilon is the insulating medium parameter, r i is the radius of the conductive part in the cable, and r o is the radius of the insulating part in the cable.
Optionally, the power supply module includes a power supply voltage and a power supply resistor, where the power supply voltage is characterized by an output voltage of the power supply device, and the power supply resistor is characterized by a resistance of the power supply device.
Optionally, determining the supply voltage between the first conductor and the second conductor per unit length based on the insulation medium parameter of the cable and the distance between the first conductor and the second conductor comprises: determining an electric field generated by charges in the first conductor per unit length based on the insulating medium parameter of the cable and the distance between the first conductor and the second conductor; a supply voltage between the first conductor and the second conductor per unit length is determined based on the electric field and the distance between the first conductor and the second conductor.
The embodiment of the invention also provides a method for observing the sea, which comprises the following steps: coupling power supply to the underwater observation equipment by using the power supply method; and observing the undersea condition by using the undersea observation equipment.
According to the embodiment of the invention, the circuit model of the underwater observation system can be established by dividing the underwater observation system into an offshore loop, an underwater load loop and an underwater loop. The circuit model can be used for simulating the circuit condition of the underwater observation system in practical application. By determining the first inductance and the first capacitance and the cable lengths of the subsea circuit, the subsea load circuit and the subsea circuit, the subsea equivalent impedance can be determined. The power supply efficiency of the underwater observation system can be improved by changing the underwater equivalent impedance into a form of a real part and an imaginary part and determining the power supply frequency of the underwater observation system to be zero frequency, so that the capacitance and the inductance generated by the seawater can be mutually offset.
Drawings
FIG. 1 schematically illustrates a side view of an undersea observation system according to an embodiment of the invention;
fig. 2 schematically shows a side view of a coupling device according to an embodiment of the invention, wherein a cable is shown;
FIG. 3 schematically illustrates an operational schematic of a circuit model according to an embodiment of the invention;
FIG. 4 schematically shows a flow chart of a power supply method according to an embodiment of the invention;
FIG. 5 schematically illustrates an operational schematic of a circuit model according to an embodiment of the present invention, wherein a portion of the circuit model corresponding to the subsurface is divided into four parallel models;
Fig. 6 schematically shows an equivalent circuit diagram after dividing the undersea observation system into a plurality of cells according to an embodiment of the present invention.
Drawings
100. A marine observation system;
110. an energy supply device;
120. a marine observation device;
130. a cable;
140. A coupling device;
141. a magnetic ring;
142. A secondary coil;
150. a first electrode;
160. A second electrode;
300. a circuit model;
310. an energy supply module;
320. a first module;
r L1, a first parasitic resistance;
L L1, a first parasitic inductance;
c L1, a first distributed capacitor;
C L2, a second distributed capacitor;
330. a second module;
r L2, a second parasitic resistance;
L L2, a second parasitic inductance;
C L3, a third distributed capacitor;
c L4, fourth distributed capacitance;
r sea, dielectric resistance;
340. a third module;
R LT, a first coupling resistor;
L T, a first coupling inductor;
l R, a second coupling inductor;
r LR, a second coupling resistor;
r load, load resistance;
500. A four-stage parallel model;
510. a first stage model;
520. A second level model;
530. a third stage model;
540. a fourth stage model;
600. an equivalent circuit;
610. a first small circuit;
620. A second small circuit;
6n0, n-th small circuit.
Detailed Description
The present invention will be further described in detail below with reference to specific embodiments and with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent.
Descriptions of structural embodiments and methods of the present invention are disclosed herein. It is to be understood that there is no intention to limit the invention to the particular disclosed embodiments, but that the invention may be practiced using other features, elements, methods and embodiments. Like elements in different embodiments are generally referred to by like numerals.
In the description of the present invention, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present invention; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.
In the description of the present invention, it should be understood that the terms "first," "second," and the like are used for defining the components, and are merely for convenience in distinguishing the corresponding components, and the terms are not meant to have any special meaning unless otherwise indicated, so that the scope of the present invention is not to be construed as being limited.
FIG. 1 schematically illustrates a side view of an undersea observation system according to an embodiment of the invention. Fig. 2 schematically shows a side view of a coupling device according to an embodiment of the invention, in which a cable is shown.
As shown in fig. 1 to 2, the embodiment of the invention provides a power supply method for coupling power supply of a submarine observation device. The power supply method is applicable to the undersea observation system 100. As shown in fig. 1, the sub-sea observation system 100 includes an energizing device 110, a sub-sea observation apparatus 120, a cable 130, a coupling device 140, a first electrode 150, and a second electrode 160. The energy supply device 110 is arranged above the water surface. The underwater observation device 120 is disposed under the sea. The power supply device 110 is connected to a cable 130. The cable 130 is sleeved with a coupling device 140, and the coupling device 140 transmits the electric energy output by the energy supply device 110 to the underwater observation equipment 120 based on electromagnetic induction of the cable 130 and conductivity of seawater.
Specifically, as shown in fig. 1-2, a first end of the cable 130 (e.g., an upper end of the cable 130 shown in fig. 1) may be connected to the energy supply device 110. The first electrode 150 and the second electrode 160 may be, but are not limited to, square metal plates. The energizing means 110 may be electrically connected to the first electrode 150. A second end of the cable 130 (a lower end of the cable 130 as shown in fig. 1) may be electrically connected with the second electrode 160 such that the coupling device 140, the cable 130, the second electrode 160, the seawater and the first electrode 150 form a closed loop. The negative electrode of the power supply 110 may be connected to seawater through the first electrode 150. The positive electrode of the energizing means 110 may be electrically connected to the second electrode 160 by a cable 130. The coupling device 140 may include a plurality of magnetic rings 141. The cable 130 may sequentially pass through the magnetic loop 141 to form a primary coil with the magnetic loop 141. Each magnet ring 141 may have a secondary coil 142 wound thereon, and the secondary coils 142 on adjacent magnet rings 141 may be connected in series. The coupling device 140 may be electrically connected to the sub sea observation device 120 through a secondary coil 142. The secondary coil 142 may be electrically coupled to the primary coil to convert the low voltage ac signal transmitted by the cable 130 to a high voltage ac signal for transmission to the undersea observation device 120 to power the undersea observation device 120. For example, the input and output lines of the marine survey apparatus 120 may be connected to the secondary coil 142 at the head end (upper end as shown in fig. 2) and the secondary coil 142 at the tail end (lower end as shown in fig. 2), respectively, i.e. the power supply to one marine survey apparatus 120 using the coupling device 140 is implemented. The undersea observation device 120 may be an undersea sensor or other undersea detection device.
Further, the undersea observation system 100 may further include an inverter circuit, through which the power supply device 110 may supply power to the undersea observation apparatus 120. Specifically, the initial power output from the power supply device 110 may be a dc signal, and the inverter circuit may convert the dc signal into a low-voltage ac signal and transmit the low-voltage ac signal to the coupling device 140 through the cable 130. The coupling device 140 converts the low-voltage ac signal into a high-voltage ac signal and transmits the high-voltage ac signal to the conversion unit, which can convert the high-voltage ac signal into a dc power supply signal that can be applied to the undersea observation device 120.
However, during the process of extending the cable 130 into the sea to form an electrical circuit with the sea, the interaction of the sea with the resonant frequency in the sub sea observation system 100 may generate capacitance and inductance, which may reduce the transmission efficiency of the electric energy. The application can improve the power supply efficiency of the underwater observation system 100 by setting the power supply frequency of the underwater observation system 100 to offset the generated capacitance and inductance.
Fig. 3 schematically shows an operational schematic of a circuit model according to an embodiment of the invention. Fig. 4 schematically shows a flow chart of a determination method according to an embodiment of the invention.
As shown in FIG. 4, the determining method 400 includes the following steps S410-S450.
In step S410, the undersea observation system 100 is divided into an offshore loop, an undersea load loop, an undersea loop, and the circuit model 300 of the undersea observation system 100 is built based on the division. The offshore loop may be characterized as the portion of the sub-sea observation system 100 located offshore. The subsea circuit may be characterized as the portion between the surface of the water and the coupling device 140. The subsea load circuit may be characterized as part of the coupling device 140 and the subsea observation device 120. The undersea loop may be characterized as the portion of the undersea observation system 100 below the coupling device 140. The circuit model 300 is created by equating capacitances, resistances, and inductances generated by the various parts of the sub-sea observation system 100 under the influence of sea water into a circuit.
In step S420, a supply voltage between the first conductor and the second conductor per unit length is determined based on the insulating medium parameter of the cable 130 and the distance between the first conductor and the second conductor. The first conductor may be a conductive portion of cable 130 and the second conductor may be seawater.
In step S430, a first inductance and a first capacitance are determined based on the supply voltage. The first inductance may be characterized as the total inductance produced by the first conductor and the second conductor per unit length. The first capacitance may be characterized as the total capacitance produced by the first conductor and the second conductor per unit length.
In step S440, a subsea equivalent impedance is determined based on the first inductance, the first capacitance, and the length of the cable 130 corresponding to the subsea load loop and the subsea loop. The subsurface equivalent impedance may be characterized as the impedance of the subsurface portion of the marine observation system 100.
In step S450, a power supply frequency is determined based on the subsea equivalent impedance and the cable lengths corresponding to the subsea loop, the subsea load loop, and the subsea loop, and power is coupled to the subsea observation device 120 based on the power supply frequency.
According to an embodiment of the present invention, the capacitance and inductance of the mutual generation of the resonance frequency in the sea water and the under sea observation system 100 may be represented by the resonance frequency of the under sea observation system 100, the under sea loop, the under sea load loop, and the cable length and insulation medium parameters corresponding to the under sea loop. The mutual capacitances and inductances of the sea water and the resonance frequencies in the marine observation system 100 may cancel each other out by taking the marine equivalent impedance into the form of a real part and an imaginary part, where the imaginary part is zero. Therefore, the imaginary part can be set to zero, and the cable lengths corresponding to the offshore loop, the offshore load loop, and the offshore loop can be brought in, and the resonance frequency can be obtained, and the obtained resonance frequency is the power supply frequency to be obtained. I.e. at this frequency, the mutually generated capacitance and inductance of the resonance frequencies in the water and the sub sea observation system 100 will cancel each other.
According to an embodiment of the present invention, the circuit model 300 of the marine observation system 100 may be built by dividing the marine observation system 100 into an offshore loop, a marine load loop, a marine loop. The circuit model 300 can be used to simulate the circuit condition of the underwater observation system 100 in practical application. By determining the first inductance and the first capacitance and the length of the cable 130 corresponding to the subsea loop, the subsea load loop and the subsea loop, a subsea equivalent impedance may be determined. By converting the equivalent impedance under the sea into the form of the real part and the imaginary part and determining that the power supply frequency of the under-sea observation system 100 is zero, the capacitance and the inductance generated by the sea water can be mutually offset, and the power supply efficiency of the under-sea observation system 100 can be improved.
As shown in fig. 3, in some embodiments, the circuit model 300 may include an energy supply module 310, a first module 320, a second module 330, and a third module 340. The first module 320 may include a first parasitic resistance R L1, a first parasitic inductance L L1, a first distributed capacitance C L1, and a second distributed capacitance C L2. The second module 330 may include a second parasitic resistance R L2, a second parasitic inductance L L2, a third distributed capacitance C L3, a fourth distributed capacitance C L4, and a dielectric resistance Rsea. The third module 340 may include a first coupling resistor R LT, a first coupling inductance L T, a second coupling inductance L R, a second coupling resistor R LR, and a load resistor R load.
Specifically, the first parasitic resistance R L1, the first parasitic inductance L L1, the second parasitic resistance R L2, the second parasitic inductance L L2, the first coupling resistance R LT, and the first coupling inductance L T may be respectively connected in series with the power supply module 310. The first distributed capacitance C L1, the second distributed capacitance C L2, the third distributed capacitance C L3, the fourth distributed capacitance C L4, and the dielectric resistance Rsea may be respectively connected in parallel with the power supply module 310. The second coupling inductance L R may be coupled with the first coupling inductance L T. The second coupling resistance R LR and the load resistance R load may be connected in series with the second coupling inductance L R. The medium resistance Rsea can be characterized as the resistance of sea water. The first coupling inductance L T may be characterized as the inductance of the primary coil. The second coupled inductance L R may be characterized as the inductance of the secondary coil. The dielectric resistor Rsea, the load resistor R load, the first coupling inductance L T, the second coupling inductance L R, the first coupling resistor R LT and the second coupling resistor R LR can be measured by an electric energy meter. The first parasitic inductance L L1, the first distributed capacitance C L1, the second distributed capacitance C L2, the second parasitic inductance L L2, the third distributed capacitance C L3, and the fourth distributed capacitance C L4 may be calculated by the first capacitance and the first inductance. The first parasitic resistance R L1 and the second parasitic resistance R L2 can be obtained by a first conductor resistance calculation formula. For example, when the first conductor is copper, the first parasitic resistance R L1 and the second parasitic resistance R L2 can be obtained by a copper wire resistance calculation formula per unit length.
In some embodiments, the first module 320, the second module 330, and the third module 340 may be characterized as circuit conditions of an offshore loop, an undersea loop, and an undersea load loop, respectively. Based on the ratio of the cable length to the unit length characterized by the first inductance, the first capacitance, and the offshore loop, the undersea loop, and the undersea load loop, the capacitance values of the first distributed capacitance C L1, the second distributed capacitance C L2, the third distributed capacitance C L3, and the fourth distributed capacitance C L4, and the inductance values of the first parasitic inductance L L1 and the second parasitic inductance L L2, respectively, may be determined.
When the insulating portion of the below sea observation system is uniform, the capacitance, inductance, and resistance per unit length can be regarded as the same. The capacitance values of the first distributed capacitor C L1, the second distributed capacitor C L2, the third distributed capacitor C L3 and the fourth distributed capacitor C L4 and the inductance values of the first parasitic inductance L L1 and the second parasitic inductance L L2 can be obtained according to the ratio of the cable length to the unit length, which are represented by the offshore loop, the undersea loop and the undersea load loop.
Because the coupling device 140 is hung on the cable in a small length, the length of the cable 130 corresponding to the undersea load loop is negligible. However, because of the capacitance present in the actual application of the hitching, the first distributed capacitance C L1 and the second distributed capacitance C L2 may be collectively characterized as the capacitance created by the corresponding cable 130 length of the offshore loop. In other words, the ratio of the sum of the capacitance value of the first distributed capacitance C L1 and the capacitance value of the second distributed capacitance C L2 to the first capacitance is equal to the ratio of the offshore loop to the unit length. The capacitance values of the first distributed capacitance C L1 and the second distributed capacitance C L2 may be the same. Likewise, the sum of the capacitance values of the third distributed capacitance C L3 and the fourth distributed capacitance C L4 is the same as the ratio of the subsea loop to the unit length. The capacitance values of the third distributed capacitance C L3 and the fourth distributed capacitance C L4 may be the same.
Fig. 5 schematically shows an operational schematic of a circuit model according to an embodiment of the invention, wherein the part of the circuit model corresponding to the subsurface is divided into four parallel models.
In some embodiments, the step S440 may include: based on the first inductance, the first capacitance, and the length of the cable 130 corresponding to the subsea loop, the subsea load loop, and the subsea loop, an equivalent impedance of the subsea observation device 120 and the coupling device 140 may be determined. Based on the equivalent impedance of the sub sea observation device 120 and the coupling means 140, a sub sea equivalent impedance may be determined.
For ease of calculation, the portion of the circuit model corresponding to the subsurface may be divided into four parallel models 500, as shown in fig. 5. The four-stage parallel model includes a first stage model 510, a second stage model 520, a third stage model 530, and a fourth stage model 540.
In some embodiments, mesh analysis may be used to find the equivalent impedance of the undersea observation device 120 and the coupling apparatus 140. The equivalent impedance Z T of the sub sea observation device 120 and the coupling means 140 can be expressed as follows:
（1）。
Wherein R LT may be the first coupling resistance, i.e. the resistance of the primary coil. j may be the imaginary part. ω may be the angular frequency of the undersea observation system. L T may be the first coupling inductance. M may be a mutual inductance between the first coupled inductance and the second coupled inductance. R Load may be the load resistance, i.e. the resistance of the undersea observation device 120. R LR may be the second coupling resistance, i.e. the resistance of the secondary winding.
Specifically, using mesh analysis, an impedance matrix of the undersea observation device 120 and the coupling means 140 is obtained. The impedance matrix may be represented as follows:
（2）。
wherein I 1 may be the current through the primary winding, i.e. the current through the first coupling inductance. I 2 may be the current through the secondary winding, i.e. the current through the second coupling inductance. V 1 may be the induced voltage caused by I 1. V 2 may be the induced voltage caused by I 2. Z 11、Z12、Z21 and Z 22 can be the equivalent impedance of four points in the mesh analysis, respectively. L T may be the first coupling inductance. R LT can be the first coupling resistor .LR can be the second coupling inductance .
The equivalent impedance Z T of the undersea observation device 120 and the coupling means 140 can be obtained from equation (2). The equivalent impedance Z T of the sub sea observation device 120 and the coupling means 140 can be expressed as follows:
（3）。
Further, the equivalent impedance Z 1 of the first stage model 510 may be expressed as follows:
（4）。
Wherein, R sea can be the medium resistance, i.e. the resistance of seawater. C L4 may be a fourth distributed capacitance.
Further, the equivalent impedance Z 2 of the second stage model 520 can be expressed as follows:
（5）。
Wherein C L3 may be the third distributed capacitance. L L2 may be a second parasitic inductance. R L2 may be a second parasitic resistance.
Further, the equivalent impedance Z 3 of the third stage model 530 may be expressed as follows:
（6）。
Wherein C L2 may be the second distributed capacitance.
Further, the equivalent impedance of the fourth stage model 540, i.e., the undersea equivalent impedance Z in, can be expressed as follows:
（7）。
Wherein C L1 may be the first distributed capacitance. L L1 may be the first parasitic inductance. R L1 may be the first parasitic resistance.
By converting the subsurface equivalent impedance Z in into a form of real and imaginary parts, the mutual capacitances and inductances of the resonance frequencies in the seawater and the subsurface observation system cancel each other out in the case of zero imaginary part. Therefore, the imaginary part can be set to zero, and the cable lengths corresponding to the offshore loop, the offshore load loop and the offshore loop can be brought in, so that the angular frequency of the offshore observation system can be obtained, and further, the resonant frequency can be obtained. The obtained resonant frequency is the power supply frequency to be obtained. Namely, under the frequency, the mutual generated capacitance and inductance of the resonance frequency in the seawater and the underwater observation system can be mutually offset, so that the power supply efficiency of the underwater observation system can be improved.
In some embodiments, step S430 described above includes determining the first inductance based on the supply voltage. And determining the first capacitance according to the first inductance based on the insulating medium parameter and the mapping relation between the first inductance and the first capacitance. The mapping relationship between the first inductance and the first capacitance can be expressed as follows:
l=μεc-1（8）。
Specifically, the magnetic flux ψ of the electric field surface between the first conductor and the second conductor can be expressed as follows:
（9）。
Where μmay be the permeability of the medium between the first conductor and the second conductor. May be a magnetic field strength vector. s may be the electric field area between the first conductor and the second conductor. /(I)May be a unit normal component of s.
Fig. 6 schematically shows an equivalent circuit diagram after dividing the undersea observation system into a plurality of cells according to an embodiment of the present invention.
The sub-sea observation system can be divided into a plurality of cells with the length delta z, and then an equivalent circuit diagram can be established. Δz may approach 0. As shown in fig. 6, the equivalent circuit 600 may include a plurality of small circuits, which may be a first small circuit 610, a second small circuit 620, and an nth small circuit 6n0, respectively. Each small circuit may include a resistor, a capacitor, and an inductor. The resistance, capacitance and inductance are related to the dielectric parameters. C 1 Δz in the first small circuit 610 may be represented as a distributed capacitance in the first small circuit, I 1(z,t) may be represented as a starting point current of the first small circuit, V 1(z,t) may be represented as a starting point voltage of the first small circuit, g 1 Δz may be represented as a conductance in the first small circuit, r 1 Δz may be represented as a resistance in the first small circuit, l 1 Δz may be represented as an inductance in the first small circuit, I 1 (z+Δz, t) may be represented as an ending point current of the first small circuit, V 1 (z+Δz, t) may be represented as an ending point voltage of the first small circuit, and z 1 may be represented as a starting point position of the second small circuit. c 1 may be denoted as a first capacitance and l 1 may be denoted as a first inductance. C 2 Δz in the second small circuit 620 may be represented as a distributed capacitance in the second small circuit, I 2(z,t) may be represented as a starting point current of the second small circuit, I 2 (z+Δz, t) may be represented as an ending point current of the second small circuit, V 2(z,t) may be represented as a starting point voltage of the second small circuit, V 2 (z+Δz, t) may be represented as an ending point voltage of the second small circuit, g 2 Δz may be represented as a conductance in the second small circuit, r 2 Δz may be represented as a resistance in the second small circuit, l 2 Δz may be represented as an inductance in the second small circuit, and z 2 may be represented as a starting point position of the second small circuit. c n may be denoted as a first capacitance and l n may be denoted as a first inductance. C n Δz in the nth small circuit 6n0 may be represented as a distributed capacitance in the nth small circuit, I n(z,t) may be represented as a starting point current of the nth small circuit, I n (z+Δz, t) may be represented as an ending point current of the nth small circuit, V n(z,t) may be represented as a starting point voltage of the nth small circuit, V n (z+Δz, t) may be represented as an ending point voltage of the nth small circuit, g n Δz may be represented as a conductance in the nth small circuit, r n Δz may be represented as a resistance in the nth small circuit, l n Δz may be represented as an inductance in the nth small circuit, and z n may be represented as a starting point position of the nth small circuit. c n may be denoted as a first capacitance and l n may be denoted as a first inductance.
Further, the total inductance l Total (S) over the Δz length can be expressed as follows:
（10）。
where I (z, t) may be a current generating a magnetic flux ψ. l may be the first inductance.
Further, in the case where Δz is very small, the magnetic flux passing through the surface of the electric field does not change, and therefore, the formula (10) can be simplified as:
（11）。
Wherein c s may be the envelope of the closed surface between the first conductor and the second conductor. l s can be the corresponding length after dimension reduction of s.
Further, after bringing equation (11) into the closed path current definition, the first inductance l can be expressed as follows:
（12）。
wherein c' may be a closed path surrounding the first conductor. May be a unit length vector of the closed path direction surrounding the first conductor.
Further, the total capacitance c Total (S) over the Δz length can be expressed as follows:
（13）。
Where c may be a first capacitance. May be the electric field generated by the charge in the first conductor per unit length. s' may be a closed surface surrounding the first conductor. c 'may be a girth around the closing surface s'. /(I)May be a unit normal vector of the surface s'. V (z, t) may be a voltage between the first conductor and the second conductor. Epsilon may be an insulating medium parameter. l 'may be the differential path length of the girth line c'.
Further, the first capacitance c may be expressed as follows:
（14）。
further, by multiplying the formula (12) with the formula (14), it is possible to obtain:
（15）。
After the formula (15) is simplified, it can be obtained:
（16）。
After the formula (16) is finished, a mapping relationship between the first capacitor and the first inductor can be obtained, i.e. l=μεc -1.
In some embodiments, the first capacitance c may be represented as follows:
（17）。
Wherein epsilon is an insulating medium parameter. r i is the radius of the conductive portion of cable 130. r o is the radius of the insulated portion of cable 130.
Further, the capacitance per unit length can be expressed as follows:
(18) Units: (F/m).
The inductance per unit length can be directly derived from equation (12) based on the relationship (9) between inductance and capacitance. The inductance per unit length can be expressed as follows:
(19) Units: (H/m).
In some embodiments, the power module 310 may include a supply voltage and a supply resistor. The supply voltage may be characterized as the output voltage of the energizing means. The supply resistance is characterized as the resistance of the energizing means. The supply resistance can be measured by an electric energy meter.
In some embodiments, step S420 includes determining an electric field generated by charges in the first conductor per unit length based on the dielectric parameters of the cable 130 and the distance between the first conductor and the second conductor. The supply voltage between the first conductor and the second conductor per unit length is determined based on the electric field and the distance between the first conductor and the second conductor.
Specifically, the electric field generated by the charges in the first conductor per unit lengthThis can be expressed as follows:
（20）。
Where q may be the amount of charge in the first conductor per unit length, epsilon may be the permittivity, r i≤r≤ro, May be the direction of charge movement, r i may be the radius of the conductor in cable 130, and r i may be the radius of cable 130.
Further, the supply voltage V between the first conductor and the second conductor may be expressed as follows:
（21）。
The embodiment of the invention also provides a submarine observation method. The method comprises the following steps: coupling power supply to the underwater observation equipment by using the power supply method; the undersea condition is observed using the undersea observation device 120. Based on the power supply frequency, the power is supplied to the underwater observation device 120 in the underwater observation system, so that the capacitance and inductance generated by the seawater can be offset each other, the power supply efficiency of the underwater observation system can be improved, and the observation efficiency of the underwater observation system can be improved.
While the foregoing embodiments have been described in some detail for purposes of clarity of understanding, it will be appreciated that the invention is not limited to the specific embodiments described above, but is to be accorded the full scope of the invention as defined by the appended claims.
Claims (10)
1. The power supply method for coupling power supply to the underwater observation equipment is suitable for the underwater observation system, the underwater observation system comprises an energy supply device arranged above the water surface and the underwater observation equipment arranged under the water, the energy supply device is connected with a cable, the cable is sleeved with a coupling device, and the coupling device transmits electric energy output by the energy supply device to the underwater observation equipment based on electromagnetic induction and the conductivity of seawater, and the power supply method is characterized by comprising the following steps:
Dividing the undersea observation system into an offshore loop, an undersea load loop and an undersea loop, and establishing a circuit model of the undersea observation system based on the division;
Determining a power supply voltage between a first conductor and a second conductor in unit length based on an insulating medium parameter of the cable and a distance between the first conductor and the second conductor, wherein the first conductor is a conductive part of the cable, and the second conductor is sea water;
Determining a first inductance and a first capacitance based on the supply voltage, wherein the first inductance is characterized by a total inductance produced by the first conductor and the second conductor per unit length, and the first capacitance is characterized by a total capacitance produced by the first conductor and the second conductor per unit length;
determining an undersea equivalent impedance based on the first inductance, the first capacitance, and the cable lengths corresponding to the undersea loop, the undersea load loop, and the undersea loop, the undersea equivalent impedance characterized as an impedance of a portion below the surface of the undersea observation system;
and determining the frequency under the condition that the imaginary part of the undersea equivalent impedance is zero as a power supply frequency based on the undersea equivalent impedance and the cable lengths corresponding to the undersea loop, the undersea load loop and the undersea loop, and coupling power supply to the undersea observation equipment based on the power supply frequency.
2. The power supply method according to claim 1, wherein the circuit model includes:
an energy supply module;
The first module comprises a first parasitic resistor and a first parasitic inductor which are connected in series with the energy supply module, and a first distributed capacitor and a second distributed capacitor which are connected in parallel with the energy supply module;
the second module comprises a second parasitic resistor and a second parasitic inductor which are connected in series with the energy supply module, and a third distributed capacitor, a fourth distributed capacitor and a medium resistor which are connected in parallel with the energy supply module, wherein the medium resistor is characterized by the resistance of seawater;
The third module comprises a first coupling resistor and a first coupling inductor which are connected in series with the energy supply module, a second coupling inductor which is coupled with the first coupling inductor, and a second coupling resistor and a load resistor which are connected in series with the second coupling inductor.
3. The power supply method according to claim 2, wherein the first, second and third modules are characterized as circuit conditions of an offshore loop, an undersea loop and an undersea load loop, respectively, and capacitance values of the first, second, third and fourth distributed capacitances and inductance values of the first and second parasitic inductances are determined based on ratios of cable lengths to unit lengths characterized by the first, first and undersea loops, the undersea loop, the undersea load loop, respectively.
4. The power supply method of claim 2, wherein determining the undersea equivalent impedance based on the first inductance, the first capacitance, and the corresponding cable lengths for the undersea loop, the undersea load loop, and the undersea loop comprises:
Determining equivalent impedance of the undersea observation equipment and the coupling device based on the first inductance, the first capacitance, and cable lengths corresponding to the undersea loop, the undersea load loop, and the undersea loop;
determining the subsurface equivalent impedance based on the subsurface observation device and the equivalent impedance of the coupling device.
5. The method of supplying power according to claim 4, wherein the equivalent impedance Z T of the undersea observation device and the coupling means is represented as follows:
；
Wherein, R LT is the first coupling resistor, j is the imaginary part, ω is the power supply frequency, L T is the first coupling inductor, M is the mutual inductance between the first coupling inductor and the second coupling inductor, R Load is the load resistor, and R LR is the second coupling resistor.
6. The power supply method of claim 1, wherein the determining the first inductance and the first capacitance based on the supply voltage comprises:
determining a first inductance based on the supply voltage;
and determining the first capacitor according to the first inductor based on the insulating medium parameter and the mapping relation between the first inductor and the first capacitor.
7. The method of supplying power according to claim 6, wherein the first capacitance c is represented as follows:
；
Wherein epsilon is the insulating medium parameter, r i is the radius of the conductive part in the cable, and r o is the radius of the insulating part in the cable.
8. The power supply method according to claim 2, wherein the power supply module comprises a power supply voltage characterized by an output voltage of the power supply device and a power supply resistance characterized by a resistance of the power supply device.
9. The power supply method according to claim 1, wherein determining the power supply voltage between the first conductor and the second conductor per unit length based on the insulation medium parameter of the cable and the distance between the first conductor and the second conductor comprises:
Determining an electric field generated by charges in the first conductor per unit length based on an insulating medium parameter of the cable and a distance between the first conductor and the second conductor;
A supply voltage between the first conductor and the second conductor per unit length is determined based on the electric field and a distance between the first conductor and the second conductor.
10. A method of marine observation comprising:
Coupling power to a sub sea observation device using the power supply method of any one of claims 1 to 9;
And observing the condition under the sea by using the underwater observation equipment.
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