CN113162246A - Power transmission line energy taking device with equivalent impedance adjusting function and application method thereof - Google Patents
Power transmission line energy taking device with equivalent impedance adjusting function and application method thereof Download PDFInfo
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Abstract
The invention discloses a power transmission line energy taking device with the function of adjusting equivalent impedance and an application method thereofcAnd a shunt resistor RSThe air gap damping magnetic core is sleeved on the power transmission line, and a secondary winding is wound on the air gap damping magnetic core and matched with the capacitor C and the adjustable resistor RcA matching capacitor C coupled to the primary side of the open-air-gap damping magnetic core via the secondary winding, the open-air-gap damping magnetic core, the secondary winding, the matching capacitor C and an adjustable resistor RcForming a resonant circuit, a shunt resistor RSAnd is connected with the secondary side of the open-air gap damping magnetic core in parallel. The invention can realize maximum power output, is suitable for current without a bus, has simple structure and can quickly adjust equivalent impedance in real time.
Description
Technical Field
The invention relates to a power supply technology of an online energy taking power supply of a high-voltage power transmission line, belongs to the field of power supply of online monitoring equipment of power equipment, and particularly relates to an energy taking device of the power transmission line with a function of adjusting equivalent impedance and an application method thereof.
Background
The transmission line is an important component of the power grid and is a main artery for electric energy transmission. As human resources can be reduced to the utmost extent for the on-line monitoring equipment of the power equipment, and relevant parameters of the running condition of the power equipment can be reflected in real time, the on-line monitoring device of the power transmission line is more and more widely applied along with the development of the construction of intelligent power grids in China. However, the reliable operation of the online monitoring device for the power transmission line has a high requirement on the performance of the power supply, the problem that the energy taking mode of the current transformer is difficult to achieve both high energy taking efficiency and saturation avoidance cannot be solved well, and how to reliably supply power to the online monitoring device for the power equipment for a long time becomes a problem to be solved urgently.
The power supply mode of the existing power transmission line monitoring equipment comprises the following steps: solar energy power supply, capacitive voltage divider energy taking, low-voltage side laser energy supply, electromagnetic coupling energy supply and the like. However, these methods have some disadvantages or technical difficulties. Compared with the prior art, the current transformer has the characteristics of simple structure, low cost, relatively stable energy source, high energy taking power and the like. Therefore, the power supply for the power transmission line operation robot is realized by the online power taking mode of the power transmission line based on impedance matching through the air gap magnetic core, and the practical application value is good. However, there are three technical difficulties in simply obtaining energy through this method: 1. when the bus current of the high-voltage transmission line is small, the power taken out by the energy taking branch line can not meet the energy supply requirement of the online monitoring equipment; 2. the current of the power transmission line fluctuates frequently along with the change of the load, so that the stable power output is ensured to be provided for the monitoring equipment; 3. when the line current is large, the magnetic core faces the saturation problem, how to ensure the normal operation of the energy-taking power supply,
patent number CN110829619A discloses an energy-taking device for power transmission line with impedance adjustment function and its application method, the energy-taking device for power transmission line with impedance adjustment function cannot adapt to the actual operation condition of power transmission line with large-range fluctuation of bus current, the energy-taking device for power transmission line with impedance adjustment function realizes continuous adjustment of equivalent impedance of damping branch by injecting excess power output by energy-taking branch into reverse current through rectification inversion, there are problems of time delay in adjustment and poor real-time performance, and it is difficult to respond quickly when current of power transmission line changes suddenly. In addition, the method of injecting the excess power into the reverse current through rectification inversion has a complex circuit structure and is difficult to realize.
Therefore, it is necessary to invent a power transmission line energy taking device with the function of adjusting the equivalent impedance and the application method thereof, which adjust the equivalent impedance in real time and have small adjustment difficulty according to different bus current conditions.
Disclosure of Invention
The invention provides a power transmission line energy taking device with a function of adjusting equivalent impedance and an application method thereof, and aims to solve the problems that the existing power transmission line energy taking device cannot adjust equivalent impedance in real time and is difficult to adjust according to different bus current conditions.
In a first aspect, the invention provides a power transmission line energy taking device with a function of adjusting equivalent impedance, which comprises a damping branch and an energy taking branch, wherein the damping branch is connected with the energy taking branch through a drainage wire, and comprises an air gap-opened damping magnetic core, a matching capacitor C and an adjustable resistor RcAnd a shunt resistor RSWherein:
the open air gap damping magnetic core is sleeved on the power transmission line, a secondary winding is wound on the open air gap damping magnetic core, and the matching capacitor C and the adjustable resistor R are connected with each othercThe matching capacitor C is coupled to the primary side of the open-air-gap damping magnetic core through the secondary winding, and the open-air-gap damping magnetic core, the secondary winding, the matching capacitor C and the adjustable resistor R are connected in seriescForming a resonant circuit, the shunt resistor RSAnd the secondary side of the open-air gap damping magnetic core is connected in parallel.
Optionally, the energy-taking branch comprises an air-gap-free energy-taking magnetic core, an AC/DC circuit and a load RLThe non-open air gap energy-taking magnetic core is provided with a secondary winding, the AC/DC circuit is connected with the secondary winding in parallel, and the load RLIn parallel with the AC/DC circuit;
one end of the drainage wire is connected with the power transmission line, and the other end of the drainage wire is connected with the non-air-gap energy-taking magnetic core.
Optionally, the shunt resistor RSAnd the secondary side of the open air gap damping magnetic core is connected in parallel through a plurality of groups of switching switches.
In a second aspect, the invention provides an application method of a power transmission line energy taking device with an equivalent impedance adjusting function, aiming at the situation that when the current of a power transmission line is small, an adjustable resistor R is adjustedcTo adjust the impedance of the damping branchThe steps are as follows:
s101: sleeving the open-air-gap damping magnetic core on a power transmission line, wherein power frequency alternating current flowing on the power transmission line generates magnetic flux in the open-air-gap damping magnetic core, and the open-air-gap damping magnetic core induces an equivalent excitation resistor Rm；
S102: the open-air-gap damping magnetic core is sleeved on the power transmission line, the primary winding of the open-air-gap damping magnetic core is equivalent to 1 turn, the secondary winding of the open-air-gap damping magnetic core is N turns, and the adjustable resistor RcThe adjustable resistor R is connected in series with the secondary windingcThe equivalent resistance of (C) is Rc';
s103: obtaining effective value I of actual current of power transmission linenObtaining the load RLBus current effective value I under ideal working conditionSThrough an excitation resistor RmAdjustable resistance RcEquivalent resistance value R ofc', load RLBus current effective value I under ideal working conditionSEffective value I of actual current of power transmission linenAnd the secondary winding N turns to obtain the secondary side adjustable resistor R of the open-air-gap damping magnetic core through the parallel current shunting relationcThe value of (a).
Optionally, the shunt relation of the parallel currents is determined by an effective value I of an actual current of the transmission linenLoad RLBus current effective value I under ideal working conditionSAnd an excitation resistor RmAnd an equivalent resistance value Rc', calculated according to the formula:
optionally, the secondary side adjustable resistor R of the open air gap damping magnetic corecThe value of (a) is obtained by calculating according to the following formula through the shunting relation of the N turns of the secondary winding and the parallel current:
in a third aspect, the present inventionThe application method of the power transmission line energy taking device with the function of adjusting the equivalent impedance is also provided, and when the current of the power transmission line is large, the bypass resistor R is adjustedSThe steps for adjusting the impedance of the damping branch are as follows:
s201: sleeving the open-air-gap damping magnetic core on a power transmission line, wherein power frequency alternating current flowing on the power transmission line generates magnetic flux in the open-air-gap damping magnetic core, and the open-air-gap damping magnetic core induces an equivalent excitation inductor LmAnd an excitation resistor Rm；
S202: the open-air-gap damping magnetic core is sleeved on the power transmission line, the primary winding of the open-air-gap damping magnetic core is equivalent to 1 turn, the secondary winding of the open-air-gap damping magnetic core is N turns, and the matching capacitor C and the adjustable resistor R are connected in seriescThe matching capacitor C is connected in series with the secondary winding, the equivalent capacitance value of the matching capacitor C is C', and the adjustable resistor R is connected in series with the secondary windingcHas an equivalent resistance of Rc', the bypass resistor RSThe bypass resistor R is connected with the secondary side of the open-air gap damping magnetic core in parallelSHas an equivalent resistance of RS′；
S203: by exciting inductance LmAnd an excitation resistor RmEquivalent resistance Rc'and equivalent capacitance value C' are calculated to obtain the equivalent impedance Z of the resonance circuit when the power frequency resonance is generatedres；
S204: obtaining effective value I of actual current of power transmission linenObtaining the load RLBus current effective value I under ideal working conditionSThrough a shunt resistor RSHas an equivalent resistance of RS', load RLBus current effective value I under ideal working conditionSEffective value I of actual current of power transmission linenThe secondary winding has N turns and equivalent impedance ZresObtaining the open-air gap damping magnetic core bypass resistance R from the shunt relationSThe value of (a).
Alternatively, the equivalent impedance ZresCalculated according to the following formula:
alternatively, the shunt relationship is based on a shunt resistance RSHas an equivalent resistance of RS', load RLBus current effective value I under ideal working conditionSEffective value I of actual current of power transmission linenAnd an equivalent impedance ZresThe flow distribution relation is calculated according to the following formula:
optionally, the open-air-gap damped core shunt resistor RSThe value of (b) is calculated according to the following formula by the shunt relation and the secondary winding being N:
according to the technical scheme, compared with the prior art, the invention has the following beneficial effects:
(1) according to the invention, the open-air gap damping magnetic core is sleeved on the power transmission line, parallel resonance is realized between the excitation inductance of the open-air gap damping magnetic core and the matching capacitor C, when the current of the power transmission line is small, the parallel resonance generated by the damping branch is used for obtaining a large virtual impedance on the branch, so that a large virtual impedance is added on the power transmission line, the current of the power transmission line can be transferred to the energy-taking branch, the load impedance is matched with the equivalent impedance of the damping branch by selecting the proper open-air gap damping magnetic core and the matching capacitor C, the maximum power output is realized by an impedance matching mode, and the power output by the energy-taking branch is ensured to be enough to meet the electric energy requirement of the power equipment online monitoring device;
(2) the invention sets an adjustable resistor Rc. Under the condition that the current of the power transmission line is small, the adjustable resistor R is adjustedcThereby changing the quality factor of the parallel resonance, realizing the real-time adjustment of the equivalent impedance of the damping branch and maintaining the current flowing through the energy-taking branch asA constant value is obtained, so that the purpose of stabilizing the output power of the energy taking branch is achieved;
(3) the invention sets a bypass resistor RSWhen the current of the transmission line is large, the bypass resistor R is adjustedSThe resistance value of the damping branch circuit realizes the quick adjustment of the equivalent impedance of the damping branch circuit, and the appropriate bypass resistor R is adjusted and input according to the increase degree of the current amplitude of the busSThe current flowing through the resonant circuit is reduced, the load power is stabilized, and the problem of saturation of the open-air damping magnetic core is solved;
(4) the damping branch and the energy taking branch are simple in structure and high in reliability, can adapt to large-range fluctuation of bus current, and have the advantage of quick response.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any inventive exercise.
Fig. 1 is a schematic diagram of an energy obtaining device of a power transmission line with an equivalent impedance adjusting function according to the present invention;
fig. 2 is an equivalent circuit diagram of a damping branch of the power transmission line energy taking device with the function of adjusting equivalent impedance provided by the invention;
fig. 3 is an equivalent circuit diagram of a damping branch circuit of an impedance adjusting method of an energy taking device of a power transmission line with an equivalent impedance adjusting function provided by the invention;
fig. 4 is a flowchart of an impedance adjusting method for power transmission line with the function of adjusting equivalent impedance to obtain energy according to different power transmission line currents provided by the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described, and it will be appreciated by those skilled in the art that the present invention may be embodied without departing from the spirit and scope of the invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Referring to fig. 1, in a first aspect, the invention provides an energy-taking device for a power transmission line 4 with an equivalent impedance adjusting function, which is used for a high-voltage power transmission line 4, and the energy-taking device for the power transmission line 4 with the equivalent impedance adjusting function comprises a damping branch 1 and an energy-taking branch 2, wherein the damping branch 1 is connected with the energy-taking branch 2 through a drainage wire 6, and the damping branch 1 comprises an open-air-gap damping magnetic core 3, a matching capacitor C and an adjustable resistor RcAnd a shunt resistor RSWherein:
the open air gap damping magnetic core 3 is sleeved on the power transmission line 4, a secondary winding is wound on the open air gap damping magnetic core 3, and the matching capacitor C and the adjustable resistor R are connected with each othercThe matching capacitor C is coupled to the primary edge of the open-air-gap damping magnetic core 3 through the secondary winding, and the open-air-gap damping magnetic core 3, the secondary winding, the matching capacitor C and the adjustable resistor R are connected in series on the secondary windingcForming a resonant circuit, the shunt resistor RSAnd is connected with the secondary side of the open-air gap damping magnetic core 3 in parallel.
The open air gap damping magnetic core 3 comprises an excitation inductor, and the excitation inductor of the open air gap damping magnetic core 3 is matched with the matching capacitor C to achieve parallel resonance and improve the line impedance.
Optionally, the energy-taking branch 2 comprises an open-air-gap damping magnetic core 5, an AC/DC circuit and a load RLThe open air gap damping magnetic core 5 is provided with a secondary winding, the AC/DC circuit is connected with the secondary winding in parallel, and the load RLIn parallel with the AC/DC circuit;
one end of the drainage wire 6 is connected with the power transmission line 4, and the other end of the drainage wire 6 is connected with the air gap damping magnetic core 5.
Optionally, the shunt resistor RSAnd the secondary side of the open air gap damping magnetic core 3 is connected in parallel through a plurality of groups of switching switches.
The current of the transmission line 4 is determined by a power supply of a power grid and an electric load and is not subjected to a load RLSo that the transmission line 4 is equivalent to an ideal current source with respect to the energy-extracting device. An open air gap magnetic core is sleeved on the power transmission line 4, and the power frequency alternating current flowing through the power transmission line 4 generates magnetic flux in the open air gap magnetic core to induce an equivalent excitation inductance LmAnd an excitation resistor Rm。
A matching capacitor C and an adjustable resistor R are connected in series on a secondary winding of the open-air-gap magnetic corecAnd the impedance adjusting branch circuit is formed together with the open-air-gap magnetic core and the cable penetrating through the open-air-gap magnetic core. Because the open-air magnetic core is sleeved on the power transmission cable, the primary winding of the open-air magnetic core can be equivalent to 1 turn, and the secondary winding of the open-air magnetic core is N turns. The circuit can be equivalent to a transformation ratio of 1: the transformer model of N ignores the influence of the internal resistance and leakage inductance of the primary winding and the secondary winding, and the equivalent circuit of the damping branch 1 is as shown in fig. 2. Matching capacitor C and adjustable resistor RcAfter being reduced to the primary side, the equivalent capacitance value and the equivalent resistance value are respectively C' and Rc', when the power frequency resonance is generated, the equivalent impedance Z of the parallel resonance loop is obtainedres。
Referring to fig. 4, the steps of adjusting the impedance for different line current changes are as follows:
s1: obtaining 4 current I of power transmission linenAnd critical saturation current I of said open-air-gap damped magnetic core 3b；
S2: judging 4 current I of power transmission linenWhether or not less than critical saturation current I of open air gap damping magnetic core 3b；
S3: if the current I of the transmission line 4nLess than critical saturation current I of the open air gap damping magnetic core 3bThen the adjustable resistance Rc is adjusted;
when the energy taking device works, when the current fluctuation range of the power transmission line 4 is small, the resistance value of the adjustable resistor Rc is switched, the quality factor of parallel resonance is changed, and meanwhile, the continuous adjustment of the equivalent impedance of the damping branch 1 is also realized;
s4: if the current I of the transmission line 4nGreater than or equal to critical saturation current I of the open air gap damping magnetic core 3bThen the shunt resistance R is adjustedS。
When the current of the power transmission line 4 exceeds a certain limit, the problem of power excess cannot be solved, and the saturation phenomenon of the damping magnetic core under the condition of large current cannot be eliminated. For this purpose, a branch is added at the output end of the secondary side of the damping magnetic core, and as shown in fig. 3, the branch is connected with a bypass resistor R through a plurality of groups of fling-cut switchesSConnected in parallel with the resonant impedance, when detecting that the bus current exceeds the critical saturation current I of the open-air damping magnetic core 3bAccording to the current, the input bypass resistor R is controlledSNumber of the cells.
The invention not only solves the problem of permanent energy supply of the power equipment on-line monitoring device, but also overcomes the defects that the traditional mutual inductance mode adopted energy taking output power is unstable and cannot adapt to the wide-range fluctuation of the line current, and has the advantages of simple structure, capability of tracking the load power demand in a self-adaptive manner so as to realize permanent and reliable power supply of the power equipment on-line monitoring device, and the like.
In a second aspect, the invention provides an application method of a power transmission line 4 energy taking device with an equivalent impedance adjusting function, aiming at the situation that when the current of the power transmission line 4 is small, the adjustable resistor R is adjustedcThe steps for adjusting the impedance of the damping branch 1 are as follows:
s101: sleeving the open-air-gap damping magnetic core 3 on the power transmission line 4, generating magnetic flux in the open-air-gap damping magnetic core 3 by power frequency alternating current flowing on the power transmission line 4, and inducing an equivalent excitation resistor R by the open-air-gap damping magnetic core 3m；
S102: the open air gap damping magnetic core 3 is sleeved on the power transmission line 4, the primary winding of the open air gap damping magnetic core 3 is equivalent to 1 turn, the secondary winding is N turns, and the adjustable resistor RcThe adjustable resistor R is connected in series with the secondary windingcThe equivalent resistance of (C) is Rc';
s103: obtaining Transmission line 4 realityEffective value of current InObtaining the load RLBus current effective value I under ideal working conditionSThrough an excitation resistor RmAdjustable resistance RcEquivalent resistance value R ofc', load RLBus current effective value I under ideal working conditionSEffective value I of actual current of power transmission line 4nAnd the secondary winding N turns to obtain the secondary side adjustable resistor R of the open-air-gap damping magnetic core 3 through the parallel current shunt relationcThe value of (a).
Optionally, the parallel current splitting relation passes through an effective value I of the actual current of the transmission line 4nLoad RLBus current effective value I under ideal working conditionSAnd an excitation resistor RmAnd an equivalent resistance value Rc', calculated according to the formula:
optionally, the secondary side adjustable resistor R of the open air gap damping magnetic core 3cThe value of (a) is obtained by calculating according to the following formula through the shunting relation of the N turns of the secondary winding and the parallel current:
in a third aspect, the invention further provides an application method of the power transmission line 4 energy taking device with the function of adjusting the equivalent impedance, and when the current of the power transmission line 4 is large, the bypass resistor R is adjustedSThe steps for adjusting the impedance of the damping branch 1 are as follows:
s201: sleeving the open-air-gap damping magnetic core 3 on the power transmission line 4, generating magnetic flux in the open-air-gap damping magnetic core 3 by power frequency alternating current flowing on the power transmission line 4, and inducing the equivalent excitation inductance L by the open-air-gap damping magnetic core 3mAnd an excitation resistor Rm；
S202: the open air gap damping magnetic core 3 is sleeved on the power transmission line 4, and the open air gap damping magnetic core 3 is originalThe equivalent of the side winding is 1 turn, the secondary side winding is N turns, and the matching capacitor C and the adjustable resistor RcThe matching capacitor C is connected in series with the secondary winding, the equivalent capacitance value of the matching capacitor C is C', and the adjustable resistor R is connected in series with the secondary windingcHas an equivalent resistance of Rc', the bypass resistor RSThe bypass resistor R is connected with the secondary side of the open-air gap damping magnetic core 3 in parallelSHas an equivalent resistance of RS′；
S203: by exciting inductance LmAnd an excitation resistor RmEquivalent resistance Rc'and equivalent capacitance value C' are calculated to obtain the equivalent impedance Z of the resonance circuit when the power frequency resonance is generatedres；
S204: obtaining the effective value I of the actual current of the transmission line 4nObtaining the load RLBus current effective value I under ideal working conditionSThrough a shunt resistor RSHas an equivalent resistance of RS', load RLBus current effective value I under ideal working conditionSEffective value I of actual current of power transmission line 4nThe secondary winding has N turns and equivalent impedance ZresObtaining the open air gap damping magnetic core 3 bypass resistance R from the shunt relationSThe value of (a).
Alternatively, the equivalent impedance ZresCalculated according to the following formula:
alternatively, the shunt relationship is based on a shunt resistance RSHas an equivalent resistance of RS', load RLBus current effective value I under ideal working conditionSEffective value I of actual current of power transmission line 4nAnd an equivalent impedance ZresThe flow distribution relation is calculated according to the following formula:
optionally, the open air gapDamping magnetic core 3 by-pass resistance RSThe value of (b) is calculated according to the following formula by the shunt relation and the secondary winding being N:
according to the technical scheme, compared with the prior art, the invention has the following beneficial effects:
(1) according to the invention, the open-air gap damping magnetic core 3 is sleeved on the power transmission line 4, the parallel resonance is realized between the excitation inductance of the open-air gap damping magnetic core 3 and the matching capacitor C, when the current of the power transmission line 4 is small, the parallel resonance generated by the damping branch 1 is used for obtaining a larger virtual impedance on the branch, so that a larger virtual impedance is added on the power transmission line 4, the current of the power transmission line 4 can be transferred to the energy taking branch 2, the load impedance is matched with the equivalent impedance of the damping branch 1 by selecting the proper open-air gap damping magnetic core 3 and the matching capacitor C, the maximum power output is realized by an impedance matching mode, and the power output by the energy taking branch 2 is ensured to be enough to meet the electric energy requirement of the on-line monitoring device of the power equipment;
(2) the invention sets an adjustable resistor Rc. Under the condition that the current of the power transmission line 4 is small, the adjustable resistor R is adjustedcThe resistance value of the damping branch circuit 1 is changed, the equivalent impedance of the damping branch circuit 1 is adjusted in real time, the current flowing through the energy taking branch circuit 2 can be maintained to be a constant value, and the purpose of stabilizing the output power of the energy taking branch circuit 2 is achieved;
(3) the invention sets a bypass resistor RSWhen the current of the transmission line is large, the bypass resistor R is adjustedSThe resistance value of the damping branch circuit 1 can be quickly adjusted, and the appropriate bypass resistor R can be adjusted according to the increase degree of the current amplitude of the busSThe current flowing through the resonant circuit is reduced, the load power is stabilized, and the problem of saturation of the open-air gap damping magnetic core 3 is solved;
(4) the damping branch 1 and the energy taking branch 2 are simple in structure and high in reliability, can adapt to large-range fluctuation of bus current, and have the advantage of quick response.
The foregoing is merely a detailed description of the invention, and it should be noted that modifications and adaptations by those skilled in the art may be made without departing from the principles of the invention, and should be considered as within the scope of the invention.
Claims (10)
1. The utility model provides a transmission line device of getting energy with adjustment equivalent impedance function, transmission line device of getting energy with adjustment equivalent impedance function includes damping branch road and branch road of getting energy, the damping branch road with the branch road of getting energy passes through the drainage and connects, its characterized in that, the damping branch road is including opening air gap damping magnetic core, matching capacitor C, adjustable resistance RcAnd a shunt resistor RSWherein:
the open air gap damping magnetic core is sleeved on the power transmission line, a secondary winding is wound on the open air gap damping magnetic core, and the matching capacitor C and the adjustable resistor R are connected with each othercThe matching capacitor C is coupled to the primary side of the open-air-gap damping magnetic core through the secondary winding, and the open-air-gap damping magnetic core, the secondary winding, the matching capacitor C and the adjustable resistor R are connected in seriescForming a resonant circuit, the shunt resistor RSAnd the secondary side of the open-air gap damping magnetic core is connected in parallel.
2. The power transmission line energy-taking device with the function of adjusting equivalent impedance of claim 1, wherein the energy-taking branch comprises an air-gap-free energy-taking magnetic core, an AC/DC circuit and a load RLThe non-open air gap energy-taking magnetic core is provided with a secondary winding, the AC/DC circuit is connected with the secondary winding in parallel, and the load RLIn parallel with the AC/DC circuit;
one end of the drainage wire is connected with the power transmission line, and the other end of the drainage wire is connected with the non-air-gap energy-taking magnetic core.
3. As claimed in claim 1The power transmission line energy taking device with the function of adjusting equivalent impedance is characterized in that the bypass resistor RSAnd the secondary side of the open air gap damping magnetic core is connected in parallel through a plurality of groups of switching switches.
4. An application method of the power transmission line energy taking device with the function of adjusting the equivalent impedance according to any one of claims 1 to 3, characterized in that when the current of the power transmission line is small, the adjustable resistance R is adjustedcThe steps for adjusting the impedance of the damping branch are as follows:
s101: sleeving the open-air-gap damping magnetic core on a power transmission line, wherein power frequency alternating current flowing on the power transmission line generates magnetic flux in the open-air-gap damping magnetic core, and the open-air-gap damping magnetic core induces an equivalent excitation resistor Rm；
S102: the open-air-gap damping magnetic core is sleeved on the power transmission line, the primary winding of the open-air-gap damping magnetic core is equivalent to 1 turn, the secondary winding of the open-air-gap damping magnetic core is N turns, and the adjustable resistor RcThe adjustable resistor R is connected in series with the secondary windingcThe equivalent resistance of (C) is Rc';
s103: obtaining effective value I of actual current of power transmission linenObtaining the load RLBus current effective value I under ideal working conditionSThrough an excitation resistor RmAdjustable resistance RcEquivalent resistance value R ofc', load RLBus current effective value I under ideal working conditionSEffective value I of actual current of power transmission linenAnd the secondary winding N turns to obtain the secondary side adjustable resistor R of the open-air-gap damping magnetic core through the parallel current shunting relationcThe value of (a).
5. The method of claim 4, wherein the shunt relationship of the parallel current passes through the effective value I of the actual current of the transmission linenLoad RLBus current effective value I under ideal working conditionSAnd an excitation resistor RmAnd an equivalent resistance value Rc', according toCalculated as follows:
6. the application method of the power transmission line energy-taking device with the function of adjusting equivalent impedance of claim 5, wherein the secondary side adjustable resistor R of the open-air-gap damping magnetic core is an adjustable resistor RcThe value of (a) is obtained by calculating according to the following formula through the shunting relation of the N turns of the secondary winding and the parallel current:
7. an application method of the power transmission line energy taking device with the function of adjusting the equivalent impedance according to any one of claims 1 to 3, characterized in that aiming at the condition that the current of the power transmission line is large, the bypass resistor R is adjustedSThe steps for adjusting the impedance of the damping branch are as follows:
s201: sleeving the open-air-gap damping magnetic core on a power transmission line, wherein power frequency alternating current flowing on the power transmission line generates magnetic flux in the open-air-gap damping magnetic core, and the open-air-gap damping magnetic core induces an equivalent excitation inductor LmAnd an excitation resistor Rm；
S202: the open-air-gap damping magnetic core is sleeved on the power transmission line, the primary winding of the open-air-gap damping magnetic core is equivalent to 1 turn, the secondary winding of the open-air-gap damping magnetic core is N turns, and the matching capacitor C and the adjustable resistor R are connected in seriescThe matching capacitor C is connected in series with the secondary winding, the equivalent capacitance value of the matching capacitor C is C', and the adjustable resistor R is connected in series with the secondary windingcHas an equivalent resistance of Rc', the bypass resistor RSThe bypass resistor R is connected with the secondary side of the open-air gap damping magnetic core in parallelSHas an equivalent resistance of RS′；
S203: by exciting inductance LmAnd an excitation resistor RmEquivalent resistance Rc'and equivalent capacitance value C' are calculated to obtain the equivalent impedance Z of the resonance circuit when the power frequency resonance is generatedres；
S204: obtaining effective value I of actual current of power transmission linenObtaining the load RLBus current effective value I under ideal working conditionSThrough a shunt resistor RSHas an equivalent resistance of RS', load RLBus current effective value I under ideal working conditionSEffective value I of actual current of power transmission linenThe secondary winding has N turns and equivalent impedance ZresObtaining the open-air gap damping magnetic core bypass resistance R from the shunt relationSThe value of (a).
8. The method of claim 7, wherein the equivalent impedance Z is the equivalent impedanceresCalculated according to the following formula:
9. the method of claim 7, wherein the shunt relationship is based on a shunt resistance RSHas an equivalent resistance of RS', load RLBus current effective value I under ideal working conditionSEffective value I of actual current of power transmission linenAnd an equivalent impedance ZresThe flow distribution relation is calculated according to the following formula:
10. the method of claim 9, wherein the open air gap is used as an energy-taking device for the power transmission line with the function of adjusting the equivalent impedanceDamping magnetic core bypass resistor RSThe value of (b) is calculated according to the following formula by the shunt relation and the secondary winding being N:
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| CN202110516623.4A CN113162246B (en) | 2021-05-12 | 2021-05-12 | Power transmission line energy taking device with equivalent impedance adjusting function and application method thereof |
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