CN115580040A - Multi-relay wireless power supply system control method and device and computer equipment - Google Patents
Multi-relay wireless power supply system control method and device and computer equipment Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/50—Circuit arrangements or systems for wireless supply or distribution of electric power using additional energy repeaters between transmitting devices and receiving devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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Abstract
The application relates to a multi-relay wireless power supply system control method, a multi-relay wireless power supply system control device, computer equipment and a storage medium. The method controls the multi-relay wireless power supply system to work according to the characteristic frequency, so that the impedance of the multi-relay wireless power supply system can meet the constant output condition, and the constant output of the multi-relay wireless power supply system is realized. In addition, the method does not increase the volume of the system, so that the system is simpler, and the problems of safety, reliability and stability when the online monitoring equipment of the high-voltage transmission line is powered are effectively solved.
Description
Technical Field
The present application relates to the field of wireless charging technologies, and in particular, to a method and an apparatus for controlling a multi-relay wireless power supply system, and a computer device.
Background
With the development of smart power grids, the application of the on-line monitoring equipment for the high-voltage transmission line is more and more extensive. The high-voltage transmission line on-line monitoring equipment mainly adopts a wireless power supply technology to provide a safe, stable and reliable power supply for the high-voltage transmission line on-line monitoring equipment.
The Wireless Power supply mode is mainly characterized in that energy in a magnetic field of a Power transmission line is obtained through a current transformer mounted on the Power transmission line, and then the energy is transmitted to a storage battery in online monitoring equipment through a Multi-Relay Wireless Power Transfer (MR-WPT) formed by a plurality of Relay coils which are coaxially arranged at equal intervals by utilizing a Wireless Power transmission technology, so that the monitoring equipment is charged. Further, in order to ensure that the monitoring device continuously works, the output of the multi-relay wireless power supply system needs to be kept constant as much as possible.
Currently, the constant output of the multi-relay wireless power supply system is generally realized by adding front and rear stage dc-dc converters, or by a hybrid topology plus the on and off of an additional switch. These approaches typically increase the size of the multi-relay wireless power system, making the system more complex.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a multi-relay wireless power supply system control method, apparatus, and computer device.
In a first aspect, the present application provides a method for controlling a multi-relay wireless power supply system. The method comprises the following steps:
obtaining an output parameter of the multi-relay wireless power supply system based on an equivalent circuit model of the multi-relay wireless power supply system;
calculating a target impedance of the multi-relay wireless power supply system when the output parameters meet preset output conditions;
obtaining characteristic frequency according to the target impedance;
and controlling the multi-relay wireless power supply system to work according to the characteristic frequency.
In one embodiment, the output parameter comprises an output voltage, and the preset output condition comprises a constant voltage output condition; when the calculated output parameters meet the preset output conditions, the target impedance of the multi-relay wireless power supply system comprises the following steps:
and when the calculated output voltage meets the constant voltage output condition, calculating a first target impedance of the multi-relay wireless power supply system.
In one embodiment, the characteristic frequency comprises a first characteristic frequency; obtaining a characteristic frequency according to the target impedance, comprising:
a first characteristic frequency is obtained according to the first target impedance.
In one embodiment, the output parameter comprises an output current, and the preset output condition comprises a constant current output condition; when the calculated output parameters meet the preset output conditions, the target impedance of the multi-relay wireless power supply system comprises the following steps:
and when the calculated output current meets the constant current output condition, the second target impedance of the multi-relay wireless power supply system is calculated.
In one embodiment, the characteristic frequency includes a second characteristic frequency, and obtaining the characteristic frequency according to the target impedance includes:
and obtaining a second characteristic frequency according to the second target impedance.
In one embodiment, obtaining an output parameter of the multi-relay wireless power supply system based on an equivalent circuit model of the multi-relay wireless power supply system includes:
establishing an equivalent circuit model corresponding to the structure of the multi-relay wireless power supply system;
obtaining a corresponding relation of circuit parameters corresponding to the equivalent circuit model based on a kirchhoff voltage law;
and obtaining the output parameters of the multi-relay wireless power supply system according to the corresponding relationship of the circuit parameters.
In one embodiment, after obtaining the circuit parameter corresponding relation corresponding to the equivalent circuit model based on kirchhoff's voltage law, before obtaining the output parameter of the multi-relay wireless power supply system according to the circuit parameter corresponding relation, the method further includes:
and simplifying the corresponding relation of the circuit parameters according to the coupling coefficient between the coils in the equivalent circuit model.
In a second aspect, the application further provides a control device for the multi-relay wireless power supply system. The device comprises:
the first calculation module is used for obtaining the output parameters of the multi-relay wireless power supply system based on the equivalent circuit model of the multi-relay wireless power supply system;
the second calculation module is used for calculating the target impedance of the multi-relay wireless power supply system when the output parameters meet the preset output conditions;
the third calculation module is used for obtaining characteristic frequency according to the target impedance;
and the control module is used for controlling the multi-relay wireless power supply system to work according to the characteristic frequency.
In a third aspect, the present application also provides a computer device. The computer device comprises a memory storing a computer program and a processor implementing the following steps when executing the computer program:
obtaining an output parameter of the multi-relay wireless power supply system based on an equivalent circuit model of the multi-relay wireless power supply system;
calculating a target impedance of the multi-relay wireless power supply system when the output parameters meet preset output conditions;
obtaining characteristic frequency according to the target impedance;
and controlling the multi-relay wireless power supply system to work according to the characteristic frequency.
In a fourth aspect, the present application further provides a computer-readable storage medium. The computer-readable storage medium, on which a computer program is stored which, when executed by a processor, carries out the steps of:
obtaining an output parameter of the multi-relay wireless power supply system based on an equivalent circuit model of the multi-relay wireless power supply system;
calculating the target impedance of the multi-relay wireless power supply system when the output parameters meet the preset output conditions;
obtaining characteristic frequency according to the target impedance;
and controlling the multi-relay wireless power supply system to work according to the characteristic frequency.
According to the multi-relay wireless power supply system control method, the multi-relay wireless power supply system control device, the computer equipment and the storage medium, the output parameters of the multi-relay wireless power supply system are obtained through the equivalent circuit model based on the multi-relay wireless power supply system, when the output parameters meet the preset output conditions, the target impedance of the multi-relay wireless power supply system is calculated, the characteristic frequency is obtained according to the target impedance, and then the multi-relay wireless power supply system is controlled to work according to the characteristic frequency. The method controls the multi-relay wireless power supply system to work according to the characteristic frequency, so that the impedance of the multi-relay wireless power supply system can meet the constant output condition, and the constant output of the multi-relay wireless power supply system is realized. In addition, the method does not increase the volume of the system, so that the system is simpler, and the problems of safety, reliability and stability when the online monitoring equipment of the high-voltage transmission line is powered are effectively solved.
Drawings
Fig. 1 is a schematic flowchart of a control method of a multi-relay wireless power supply system in an embodiment;
FIG. 2 is a block diagram of a multi-relay wireless power supply system in one embodiment;
FIG. 3 is a diagram of an equivalent circuit model architecture of a multi-relay wireless power supply system in one embodiment;
fig. 4 is a schematic flowchart of a control method of a multi-relay wireless power supply system in another embodiment;
fig. 5 is a flowchart illustrating a control method for a multi-relay wireless power supply system in another embodiment;
fig. 6 is a flowchart illustrating a control method of a multi-relay wireless power supply system according to still another embodiment;
fig. 7 is a diagram of an equivalent circuit model of a multi-relay wireless power supply system in another embodiment;
fig. 8 is a block diagram of a multi-relay wireless power supply system in another embodiment;
fig. 9 is a diagram showing an equivalent circuit model structure of a multi-relay wireless power supply system in still another embodiment;
fig. 10 is a block diagram showing the configuration of a control device of a multi-relay wireless power supply system according to an embodiment;
FIG. 11 is a diagram illustrating an internal structure of a computer device in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad application.
The method for controlling the multi-relay wireless power supply system provided by the embodiment is used for controlling the multi-relay wireless power supply system. The system utilizes the principle of magnetic field coupling between coils to transmit electric energy from one end to the other. Therefore, the multi-relay wireless power supply system is generally used to supply power to the device. Particularly, the power supply device can provide safe, reliable and stable power supply for the high-voltage transmission line on-line monitoring equipment. The multi-relay wireless power supply system control method can be applied to a control device of a multi-relay wireless power supply system, and can also be applied to a terminal connected with the control device. The terminal can be, but is not limited to, various personal computers, notebook computers, smart phones, tablet computers, internet of things devices and portable wearable devices. The portable wearable device can be a smart watch, a smart bracelet, a head-mounted device, and the like.
In one embodiment, as shown in fig. 1, there is provided a multi-relay wireless power supply system control method, including the steps of:
and 102, obtaining an output parameter of the multi-relay wireless power supply system based on an equivalent circuit model of the multi-relay wireless power supply system.
As shown in fig. 2, the multi-relay wireless power supply system includes a transmitting unit, a relay unit, and a receiving unit. The transmitting unit comprises a direct current input power supply and a full-bridge inverter. The direct current input power supply is obtained by taking energy from a high-voltage bus by a current transformer and performing rectification and voltage conversion, and the direct current input voltage of the direct current input power supply is U dc . The direct current input power supply is electrically connected with a full-bridge inverter, and the full-bridge inverter comprises four switching devices S 1 、S 2 、S 3 And S 4 . The full-bridge inverter is electrically connected with a transmitting coil L 1 Transmitting coil L 1 Series resonance capacitor C 1 Forming a transmit loop.
The relay unit includes a plurality of relay loops. For example, the relay coil L 2 Series resonance capacitor C 2 Forming a first relay loop, a relay coil L 2 And a transmitting coil L 1 Magnetic coupling with mutual inductance of M 12 . Relay coil L 3 Series resonance capacitor C 3 Forming a second relay loop, the relay coil L 3 And a relay coil L 2 Magnetic coupling with mutual inductance of M 23 . And so on until the (n-1) th relay coil L n-1 Series resonance capacitor C n-1 Forming an n-2 th relay loop, a relay coil L n-1 And a receiving coil L of a receiving end n Magnetic coupling with mutual inductance of M (n-1)n 。
The receiving unit comprises a rectifier and a filter capacitor C d And a load resistance R L . The rectifier is electrically connected with the receiving coil L n A receiving coil L n Series resonance capacitor C n Forming a receiving loop. Parasitic resistance of each coil in the multi-relay wireless power supply system is R 1 、R 2 、······、R n-1 And R n And the parasitic resistance of each coil is respectively connected with the corresponding coil in series.
Specifically, according to the structure of the multi-relay wireless power supply system, as shown in fig. 3, an equivalent circuit model of the multi-relay wireless power supply system may be established. Wherein a rectifier and a load resistor R in the receiving unit can be connected L Equivalent to an AC equivalent load R eq . And analyzing the equivalent circuit model to obtain the output parameters of the multi-relay wireless power supply system. The output parameters may include an output voltage, an output current, and the like of the multi-relay wireless power supply system. For example, the value of the output voltage of the multi-relay wireless power supply system is obtained by analyzing the voltage of each loop in the equivalent circuit model. The value of the output current of the multi-relay wireless power supply system can also be obtained by analyzing the current of each loop in the equivalent circuit model.
And 104, calculating the target impedance of the multi-relay wireless power supply system when the output parameters meet the preset output conditions.
The preset output condition is that the output of the multi-relay power supply system needs to be kept constant. Optionally, the multi-relay power supply system may maintain a constant voltage output, or the multi-relay power supply system may maintain a constant current output. In addition, the impedance generally includes the reactance of the coil and the capacitance, and the resistance value of the resistance. The target impedance obtained from the output parameter may be a specific value or a relationship between a plurality of target impedances.
Specifically, when the output voltage or the output current of the multi-relay wireless power supply system meets the condition of constant voltage output or constant current output, the target impedance value of the multi-relay wireless power supply system at that time or the relational expression between the target impedances is calculated respectively. That is, when the impedance of the multi-relay wireless power supply system is the target impedance, the output voltage of the multi-relay wireless power supply system may be kept constant, or the output current may be kept constant, so as to satisfy a preset constant voltage output condition or a preset constant current output condition.
And 106, obtaining the characteristic frequency according to the target impedance.
The characteristic frequency may be plural. Different characteristic frequencies correspond to different working frequencies of the multi-relay wireless power supply system, so that the multi-relay wireless power supply system works under different working conditions.
Specifically, there is a certain correspondence between impedance and characteristic frequency. The relationship between impedance and characteristic frequency may be represented by a matrix. When the impedance is the target impedance, a matrix equation may be established. The eigenfrequency can be calculated by solving a matrix equation. And different matrix equations can be established according to different target impedances, so that different characteristic frequencies can be obtained to meet different preset output conditions.
And step 108, controlling the multi-relay wireless power supply system to work according to the characteristic frequency.
The controlling of the operation of the multi-relay wireless power supply system according to the characteristic frequency may be controlling a switching frequency of a full-bridge inverter in the multi-relay wireless power supply system according to the characteristic frequency, so that the multi-relay wireless power supply system operates at the characteristic frequency.
In this embodiment, an output parameter of the multi-relay wireless power supply system is obtained through an equivalent circuit model based on the multi-relay wireless power supply system, when the output parameter is calculated to meet a preset output condition, a target impedance of the multi-relay wireless power supply system is obtained, a characteristic frequency is obtained according to the target impedance, and then the multi-relay wireless power supply system is controlled to operate according to the characteristic frequency. The method controls the multi-relay wireless power supply system to work according to the characteristic frequency, so that the impedance of the multi-relay wireless power supply system can meet the constant output condition, and the constant output of the multi-relay wireless power supply system is realized. In addition, the method does not increase the volume of the system, so that the system is simpler, and the problems of safety, reliability and stability when the online monitoring equipment of the high-voltage transmission line is powered are effectively solved.
In one embodiment, the output parameter comprises an output voltage and the preset output condition comprises a constant voltage output condition. As shown in fig. 4, step 104 includes step 404.
Wherein, as shown in FIG. 2, the output voltage is a load resistor R L Voltage U across o . It is understood that when the equivalent circuit model of the multi-relay wireless power supply system is analyzed, the output voltage can also be the ac equivalent load R in fig. 3 eq Voltage across
The constant voltage output can be understood as the output voltage of the multi-relay wireless power supply system does not follow the load resistor R in the receiving unit L The variation, or variation in the output voltage, is within an acceptable range. The input voltage can be understood as a DC input power supply U dc AC voltage formed after full bridge inverter
Through the analysis of an equivalent circuit model of the multi-relay wireless power supply system, the input voltage reaches the receiving unit after being transmitted through a loop comprising a plurality of impedances and reaches the receiving unit through the alternating current equivalent load R eq Form an output voltage at both ends
Therefore, the value of the output voltage can be determined by the input voltage, the impedance of each loop and the AC equivalent load R eq And (4) showing. Then based on the output voltage, the input voltage, the impedance of each loop and the AC equivalent load R eq The corresponding relation between the two can establish an equation under the condition of constant voltage output. Calculating according to the equation to obtain output voltage satisfyingA first target impedance at a constant voltage output condition.
In one embodiment, the characteristic frequency comprises a first characteristic frequency. As shown in fig. 4, step 106 includes step 406.
Because each loop in the multi-relay wireless power supply system comprises the coil and the resonance capacitor, the impedance of each loop can change along with the change of the working frequency of the multi-relay wireless power supply system based on the working characteristics of the coil and the resonance capacitor. Therefore, the resonance frequency of the multi-relay wireless power feeding system at this time can be calculated from the impedance of each loop in the multi-relay wireless power feeding system, and the resonance frequency can be set as the characteristic frequency. Optionally, when the output voltage meets the constant voltage output condition, the first target impedance is calculated. And then establishing a matrix equation according to the first target impedance, and calculating to obtain a first characteristic frequency.
Correspondingly, after obtaining the first characteristic frequency, step 108 includes step 408.
And step 408, controlling the multi-relay wireless power supply system to work according to the first characteristic frequency.
In the above embodiment, when the output voltage meets the constant voltage output condition, the first target impedance of the multi-relay wireless power supply system is calculated, the first characteristic frequency is obtained according to the first target impedance, and then the multi-relay wireless power supply system is controlled to operate according to the first characteristic frequency, so that the multi-relay wireless power supply system can maintain constant voltage output.
In one embodiment, the output parameter comprises an output current and the preset output condition comprises a constant current output condition. As shown in fig. 5, step 104 includes step 504.
And step 504, calculating a second target impedance of the multi-relay wireless power supply system when the output current meets the constant current output condition.
Wherein, the output current is a DC load R contained in the receiving loop L Current of branch I o . The constant current output can be understood as the output current of the multi-relay wireless power supply system and the direct current load R in the receiving unit L Independent, output current holdingIs constant. It is understood that, when the equivalent circuit model of the multi-relay wireless power supply system is analyzed, the output current can also include the ac equivalent load R in fig. 3 eq Current in the loop
And I o There is a certain numerical correspondence between them.
Specifically, refer to the output voltage, the input voltage, the impedance of each loop, and the ac equivalent load R eq The corresponding relation among the three can obtain the output current, the impedance of each loop and the equivalent AC load R eq The correspondence between them. Based on the correspondence, an equation under a constant current output condition can be established. And calculating according to the equation to obtain a second target impedance when the output current meets the constant current output condition. It is understood that the first target impedance and the second target impedance are derived from different output conditions, and are not the same.
In one embodiment, the characteristic frequency comprises a second characteristic frequency. Step 106 includes step 506.
Similarly, when the output current meets the constant current output condition, a second target impedance of the multi-relay wireless power supply system is calculated, and then a second characteristic frequency is calculated according to the second target impedance. It will be appreciated that the first and second eigenfrequencies are derived from different target impedances, which are not the same.
Correspondingly, after obtaining the second eigenfrequency, step 108 includes step 508.
And step 508, controlling the multi-relay wireless power supply system to work according to the second characteristic frequency.
In the above embodiment, when the output current satisfies the constant current output condition, the second target impedance of the multi-relay wireless power supply system is calculated, the second characteristic frequency is obtained according to the second target impedance, and then the multi-relay wireless power supply system is controlled to operate according to the second characteristic frequency, so that the multi-relay wireless power supply system can maintain constant current output.
In one embodiment, as shown in FIG. 6, step 102 includes step 602, step 604, and step 606.
Specifically, the multi-relay wireless power supply system comprises a transmitting unit, a relay unit and a receiving unit, and corresponding equivalent circuit models can be established according to the circuit structures of the units. For example, the transmitting unit comprises a dc input voltage and a full bridge inverter, which in turn comprises four switching devices. The switching frequency of the four switching devices is controlled to realize the on and off of the direct current input voltage, so that the alternating current input voltage is realized. Therefore, the direct current input voltage and the full bridge inverter can be equivalent to an alternating current voltage source. The alternating voltage source is connected with other devices in series to form a transmitting loop. Similarly, the receiving unit comprises a rectifier and a filter capacitor C d And a load resistance R L The rectifier and the filter capacitor C can be connected d And a load resistance R L Equivalent to an AC equivalent load R eq . AC equivalent load R eq And the other devices are connected in series to form a receiving loop. Wherein the content of the first and second substances,
and step 604, obtaining a corresponding relation of circuit parameters corresponding to the equivalent circuit model based on the kirchhoff voltage law.
Specifically, according to the equivalent circuit model and based on kirchhoff's voltage law, the relationship among the output voltage, the output current, and each impedance can be established, and the corresponding relationship is as follows:
wherein the content of the first and second substances,
the current of the ith loop is respectively the current of the ith loop,
the voltage of the ith loop is respectively. In particular, it is possible to use, for example,
which is representative of the input voltage, is,
representing the output current. X i (i =1,2, \8230;, n) are the reactances of the ith loop, respectively, and can be expressed as:
X i ＝jωL i +1/jωC i (i＝1,2,…，n) (2)
and 606, obtaining output parameters of the multi-relay wireless power supply system according to the corresponding relationship of the circuit parameters.
Specifically, by performing matrix calculation on the above-described circuit parameter correspondence expression (i.e., expression (1)), an expression of the output voltage and an expression of the output current of the multi-relay wireless power supply system can be obtained.
In the above embodiment, the equivalent circuit model corresponding to the structure of the multi-relay wireless power supply system is established, the circuit parameter corresponding relation corresponding to the equivalent circuit model is obtained based on kirchhoff voltage law, and the output parameter of the multi-relay wireless power supply system is obtained according to the circuit parameter corresponding relation. The step can accurately obtain the output parameters of the multi-relay wireless power supply system, so that the target impedance can be conveniently solved.
In one embodiment, as shown in fig. 6, after step 604 and before step 606, the multi-relay wireless power supply system control method further includes step 605.
And 605, simplifying the corresponding relation of the circuit parameters according to the coupling coefficient between the coils in the equivalent circuit model.
Wherein, the coupling coefficient k between the coils in the equivalent circuit model ij Can representComprises the following steps:
wherein M is ij Is the mutual inductance between the ith coil and the jth coil; l is i And L j The inductances of the ith coil and the jth coil, respectively.
Because the coils are identical in structure and are uniformly arranged, the mutual inductance between the coils has the following relationship:
therefore, based on the above analysis, the circuit parameter correspondence equation (i.e., equation (1)) can be simplified to:
wherein, ω is o Is the system resonance angular frequency. To compensate for self-inductance of the transmitter, relay and receiver coils, C 1 、C 2 、.......、C n-1 And C n The following should be satisfied:
wherein f is o Is the resonant frequency of the system.
Specifically, by solving the simplified circuit parameter correspondence equation (i.e., equation (5)), the following expression of the output voltage and the output current can be obtained:
wherein Z is p And Z Q Respectively as follows:
Z Q ＝jωL(k 1n +α T Λ -1 β) (9)
wherein α, β, and Λ are respectively:
α＝[k 12 k 13 …k 1(n-1) ] T (10)
β＝[k 1(n-1) k 1(n-2) …k 12 ] T (11)
when the expressions of the output voltage and the output current are analyzed, an equivalent circuit model of the multi-relay wireless power supply system can be further simplified, as shown in fig. 7, the simplified equivalent circuit model is a two-port equivalent circuit model. The two-port equivalent circuit model enables the impedance of all loops to be equivalent to Z P Equating the reactance of all coils to Z Q 。
Represents the current in the transmit loop, i.e., the input current;
represents the current in the receiving loop, i.e. the output current;
representing an ac input voltage. After analyzing the expressions of the output voltage and the output current, it can be found that when Z is P ＝Z Q While the output voltage is kept constant, an
When Z is P When =0, output current and load resistance R L Is irrelevant, remains constant, and
i.e. the first target impedance is Z P ＝Z Q The second target impedance is Z P And =0. Then, can be according to Z P ＝Z Q Obtaining a first characteristic frequency f 1 According to Z P =0, obtain second characteristic frequency f 2 。
In the embodiment, the corresponding relation of the circuit parameters is simplified according to the coupling coefficient between the coils in the equivalent circuit model, so that the analysis and calculation process is simpler and more convenient, and the efficiency of solving the target impedance is further improved.
According to the multi-relay wireless power supply system control method, the output parameters of the multi-relay wireless power supply system are obtained through the equivalent circuit model based on the multi-relay wireless power supply system, when the output parameters meet the preset output conditions, the target impedance of the multi-relay wireless power supply system is calculated, the characteristic frequency is obtained according to the target impedance, and then the multi-relay wireless power supply system is controlled to work according to the characteristic frequency. The method controls the operation of the multi-relay wireless power supply system according to the characteristic frequency, so that the impedance of the multi-relay wireless power supply system can meet the constant output condition, and the constant output of the multi-relay wireless power supply system is realized. In addition, the method does not increase the volume of the system, so that the system is simpler, and the problems of safety, reliability and stability when the online monitoring equipment of the high-voltage transmission line is powered are effectively solved.
To facilitate understanding, a more detailed embodiment is provided below.
In one embodiment, the multi-relay wireless power supply system is a three-relay wireless power supply system. As shown in fig. 8, the number of the relay units in the three-relay wireless power supply system is three, and the configurations of the transmitting unit and the receiving unit are the same as described above. The method for controlling the three-relay wireless power supply system comprises the following specific steps:
1. according to the structure of the three-relay wireless power supply system, an equivalent circuit model is established, as shown in fig. 9. To compensate for self-inductance of the transmitter coil, relay coil and receiver coil, C 1 、C 2 、C 3 、C 4 And C 5 The following should be satisfied:
wherein, ω is o Is the resonant angular frequency of the system, f o Is the resonant frequency of the system.
2. According to load resistance R L Calculating the AC equivalent load R of the receiving unit eq 。
3. Establishing a corresponding relation of circuit parameters corresponding to the equivalent circuit model according to a kirchhoff voltage law:
wherein R is 1 、R 2 、R 3 、R 4 、R 5 Respectively, resistance, X, of each coil loop i (i =1,2, \8230;, 5) are the reactances of the respective coil loops, and can be expressed as:
X i ＝jωL i +1/jωC i (i＝1,2,…，5) (16)
4. and simplifying the corresponding relation (15) of the circuit parameters according to the relation between the coupling coefficients of the ith coil and the jth coil. Coupling coefficient k between ith coil and jth coil ij Can be expressed as:
considering that the coils are identical in structure and are uniformly arranged, the mutual inductance between the coils has the following relationship:
in order to simplify the analysis, the internal resistance of the coil is ignored, and based on the analysis, the simplified circuit parameter corresponding relation can be:
5. by solving the circuit parameter correspondence (19), the expression of the output voltage and the output current is found as follows:
wherein Z is p And Z Q Respectively as follows:
Z Q ＝jωL(k 15 +α T Λ -1 β) (22)
wherein α, β, and Λ are:
α＝[k 12 k 13 k 14 ] T (23)
β＝[k 14 k 13 k 12 ] T (24)
6. by analyzing the expressions of the output voltage and the output current, it can be found that when Z is P ＝Z Q While the output voltage is kept constant, an
When Z is P When =0, output current andload independent, remains constant, and
7. obtaining a target impedance Z according to the constant voltage output condition P ＝Z Q Is further based on Z P ＝Z Q Determining the characteristic frequency f for realizing constant voltage output 1 (ii) a According to the constant current output condition, obtaining a target impedance Z P =0, based on Z P =0, determining the characteristic frequency f for realizing constant current output 2 。
8. Controlling the working frequency of the three-relay wireless power supply system to be f according to the actual working condition requirement 1 Realizing constant voltage output and controlling the working frequency of the three-relay wireless power supply system to be f 2 And constant current output is realized. And by controlling the operating frequency from f 1 Is changed to f 2 Constant voltage/constant current output mode switching can be performed.
In the control method of the multi-relay wireless power supply system according to the embodiment, a circuit parameter corresponding relation corresponding to an equivalent circuit model is established based on the equivalent circuit model of the multi-relay wireless power supply system, the circuit parameter corresponding relation is simplified according to a relation of coupling coefficients between coils, and then an expression of output voltage and output current is obtained according to the circuit parameter corresponding relation. Through analyzing the expression of the output voltage and the output current, each target impedance meeting the constant voltage output or the constant current output is solved, and each output characteristic frequency can be determined according to each target impedance. And finally, according to the actual working condition requirement, the constant voltage output or the constant current output is realized by controlling the multi-relay wireless power supply system to operate at different characteristic frequencies. The method ensures that the system keeps constant voltage or constant current output characteristics through frequency adjustment, does not increase the extra volume of the system, is simple to control, and effectively solves the problems of safety, reliability and stability when the online monitoring equipment of the high-voltage transmission line is powered.
It should be understood that, although the steps in the flowcharts related to the embodiments described above are shown in sequence as indicated by the arrows, the steps are not necessarily performed in sequence as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a part of the steps in the flowcharts related to the embodiments described above may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the execution order of the steps or stages is not necessarily sequential, but may be rotated or alternated with other steps or at least a part of the steps or stages in other steps.
Based on the same inventive concept, the embodiment of the present application further provides a multi-relay wireless power supply system control device for implementing the above-mentioned multi-relay wireless power supply system control method. The implementation scheme for solving the problem provided by the apparatus is similar to the implementation scheme described in the above method, so specific limitations in one or more embodiments of the multi-relay wireless power supply system control apparatus provided below may refer to the limitations in the above multi-relay wireless power supply system control method, and details are not described here again.
In one embodiment, as shown in fig. 10, there is provided a multi-relay wireless power supply system control apparatus including: a first calculation module 1001, a second calculation module 1002, and a third calculation module 1003, wherein:
the first calculation module 1001 is used for obtaining an output parameter of the multi-relay wireless power supply system based on an equivalent circuit model of the multi-relay wireless power supply system;
the second calculating module 1002 is configured to calculate a target impedance of the multi-relay wireless power supply system when the output parameter meets a preset output condition;
a third calculation module 1003, configured to obtain a characteristic frequency according to the target impedance;
and a control module 1004, configured to control the operation of the multi-relay wireless power supply system according to the characteristic frequency.
In one embodiment, the second calculation module 1002 comprises an impedance calculation unit, wherein:
and the impedance calculating unit is used for calculating a first target impedance of the multi-relay wireless power supply system when the output voltage meets the constant voltage output condition.
In one embodiment, the third calculation module 1003 comprises a frequency calculation unit, wherein:
and the frequency calculation unit is used for obtaining a first characteristic frequency according to the first target impedance.
In one embodiment, the impedance calculating unit may be further configured to calculate a second target impedance of the multi-relay wireless power supply system when the output current satisfies the constant current output condition.
In one embodiment, the frequency calculation unit may be further configured to obtain a second characteristic frequency according to a second target impedance.
In one embodiment, the first calculation module 1001 includes a modeling unit, a circuit parameter calculation unit, and an output parameter calculation unit, wherein:
the modeling unit is used for establishing an equivalent circuit model corresponding to the structure of the multi-relay wireless power supply system;
the circuit parameter calculating unit is used for obtaining a corresponding relation of circuit parameters corresponding to the equivalent circuit model based on the kirchhoff voltage law;
and the output parameter calculating unit is used for obtaining the output parameters of the multi-relay wireless power supply system according to the circuit parameter corresponding relation.
In one embodiment, the first calculation module 1001 further comprises a circuit parameter reduction unit, wherein:
and the circuit parameter simplifying unit is used for simplifying the corresponding relation of the circuit parameters according to the coupling coefficient between the coils in the equivalent circuit model.
All or part of each module in the multi-relay wireless power supply system control device can be realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent of a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as shown in fig. 11. The computer device includes a processor, a memory, a communication interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The communication interface of the computer device is used for communicating with an external terminal in a wired or wireless manner, and the wireless manner can be realized through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. The computer program is executed by a processor to implement a multi-relay wireless power supply system control method. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the computer equipment, an external keyboard, a touch pad or a mouse and the like.
Those skilled in the art will appreciate that the architecture shown in fig. 11 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In an embodiment, a computer-readable storage medium is provided, on which a computer program is stored which, when being executed by a processor, carries out the steps of the above-mentioned method embodiments.
In an embodiment, a computer program product is provided, comprising a computer program which, when being executed by a processor, carries out the steps of the above-mentioned method embodiments.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, database, or other medium used in the embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high-density embedded nonvolatile Memory, resistive Random Access Memory (ReRAM), magnetic Random Access Memory (MRAM), ferroelectric Random Access Memory (FRAM), phase Change Memory (PCM), graphene Memory, and the like. Volatile Memory can include Random Access Memory (RAM), external cache Memory, and the like. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases referred to in various embodiments provided herein may include at least one of relational and non-relational databases. The non-relational database may include, but is not limited to, a block chain based distributed database, and the like. The processors referred to in the embodiments provided herein may be general purpose processors, central processing units, graphics processors, digital signal processors, programmable logic devices, quantum computing based data processing logic devices, etc., without limitation.
All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, and these are all within the scope of protection of the present application. Therefore, the protection scope of the present patent application shall be subject to the appended claims.
Claims (10)
1. A method for controlling a multi-relay wireless power supply system, the method comprising:
obtaining an output parameter of a multi-relay wireless power supply system based on an equivalent circuit model of the multi-relay wireless power supply system;
calculating the target impedance of the multi-relay wireless power supply system when the output parameter meets a preset output condition;
obtaining characteristic frequency according to the target impedance;
and controlling the multi-relay wireless power supply system to work according to the characteristic frequency.
2. The method as claimed in claim 1, wherein the output parameter comprises an output voltage, the predetermined output condition comprises a constant voltage output condition, and the calculating the target impedance of the multi-relay wireless power supply system when the output parameter satisfies the predetermined output condition comprises:
and calculating a first target impedance of the multi-relay wireless power supply system when the output voltage meets the constant voltage output condition.
3. The multi-relay wireless power supply system control method according to claim 2, wherein the characteristic frequency includes a first characteristic frequency, and the obtaining the characteristic frequency according to the target impedance includes:
and obtaining a first characteristic frequency according to the first target impedance.
4. The method according to claim 1, wherein the output parameter comprises an output current, the preset output condition comprises a constant current output condition, and the calculating the target impedance of the multi-relay wireless power supply system when the output parameter meets the preset output condition comprises:
and calculating a second target impedance of the multi-relay wireless power supply system when the output current meets the constant current output condition.
5. The multi-relay wireless power supply system control method according to claim 4, wherein the characteristic frequency includes a second characteristic frequency, and the obtaining the characteristic frequency according to the target impedance includes:
and obtaining a second characteristic frequency according to the second target impedance.
6. The method according to claim 1, wherein obtaining the output parameter of the multi-relay wireless power supply system based on an equivalent circuit model of the multi-relay wireless power supply system comprises:
establishing an equivalent circuit model corresponding to the structure of the multi-relay wireless power supply system;
obtaining a corresponding relation of circuit parameters corresponding to the equivalent circuit model based on a kirchhoff voltage law;
and obtaining the output parameters of the multi-relay wireless power supply system according to the corresponding relationship of the circuit parameters.
7. The method for controlling the multi-relay wireless power supply system according to claim 6, wherein after obtaining the circuit parameter corresponding relation corresponding to the equivalent circuit model based on kirchhoff's voltage law and before obtaining the output parameter of the multi-relay wireless power supply system according to the circuit parameter corresponding relation, the method further comprises:
and simplifying the corresponding relation of the circuit parameters according to the coupling coefficient between the coils in the equivalent circuit model.
8. A multi-relay wireless power supply system control apparatus, characterized in that the apparatus comprises:
the first calculation module is used for obtaining an output parameter of the multi-relay wireless power supply system based on an equivalent circuit model of the multi-relay wireless power supply system;
the second calculation module is used for calculating the target impedance of the multi-relay wireless power supply system when the output parameter meets a preset output condition;
the third calculation module is used for obtaining characteristic frequency according to the target impedance;
and the control module is used for controlling the multi-relay wireless power supply system to work according to the characteristic frequency.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the method of any of claims 1 to 7.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 7.
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