CN117572123A - Multi-relay WPT system parameter testing method and device - Google Patents

Multi-relay WPT system parameter testing method and device Download PDF

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Publication number
CN117572123A
CN117572123A CN202311551692.4A CN202311551692A CN117572123A CN 117572123 A CN117572123 A CN 117572123A CN 202311551692 A CN202311551692 A CN 202311551692A CN 117572123 A CN117572123 A CN 117572123A
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China
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parameter
array
relay
wpt system
input
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刘野然
何正友
李勇
张鑫
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Southwest Jiaotong University
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Southwest Jiaotong University
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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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • 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
    • H02J50/70—Circuit arrangements or systems for wireless supply or distribution of electric power involving the reduction of electric, magnetic or electromagnetic leakage fields

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)

Abstract

The application provides a multi-relay WPT system parameter testing method and device, belongs to the technical field of wireless power transmission, and is used for solving the problems that in the prior art, a multi-relay WPT system parameter measuring process is complex, time consumption is long, and loops of coils at all levels are required to be disconnected. The method comprises the following steps: initializing parameters of a multi-relay WPT system, constructing a parameter array P to be estimated and a parameter deviation array A, and constructing a two-dimensional matrix Q by using the parameter array P and the parameter deviation array A; measuring at each operating frequency f with the operating frequency f as a variable k Input phase angle theta of multi-relay WPT system in_k The direct-current voltage Vout_k of the load component is used for obtaining an input phase angle array theta and an output voltage array V; iteratively updating elements in the two-dimensional matrix Q through the input phase angle array theta and the output voltage array V, and repeating the W through the updated elements in the two-dimensional matrix QParameters of the PT system are estimated. According to the method and the device, the loops of coils at all levels are not required to be disconnected in the parameter estimation process, the time consumption is short, and the parameter estimation precision is high.

Description

Multi-relay WPT system parameter testing method and device
Technical Field
The invention relates to the technical field of wireless power transmission, in particular to a method and a device for testing parameters of a multi-relay WPT system.
Background
The wireless power supply system uses a high-frequency electromagnetic field near-field coupling principle, uses a high-frequency magnetic field as a transmission medium, and realizes wireless transmission of electric energy through magnetic field coupling between a transmitting coil and a receiving coil. The common two-coil wireless power supply system mainly comprises two parts, wherein one part is a transmitting end connected to one side of a power supply, the other part is a receiving end positioned on the load side, and energy is transmitted from the transmitting end to the receiving end in an electromagnetic induction mode. The wireless power supply system has the characteristics of electrical and mechanical isolation, and can be used in severe working environments such as high voltage, dust free and the like.
In order to increase the transmission distance of the wireless power supply system while maintaining electrical isolation between coils, a plurality of relay coils may be interposed between the transmitting and receiving coils, thereby forming a multi-relay wireless power supply system. Energy is transferred from the first transmit coil, primarily through the relay coil, to the receive coil and the load. The multi-relay wireless power supply mode can be used for high-voltage scenes, such as power supply of monitoring equipment on a power transmission line tower.
However, since the multi-relay wireless power supply system has a plurality of cross-coupled coils and a long transmission distance, as the number of coils increases, the measurement of self inductance and mutual inductance of the multi-relay wireless power supply coils becomes more and more complex and takes a long time; in addition, the existing measuring method needs to disconnect loops of coils of each stage, and after the coils are packaged and fixed by a shell, actual coil parameters are more difficult to measure.
Disclosure of Invention
The invention aims to provide a method and a device for testing parameters of a multi-relay WPT system. The method is used for solving the problems that in the prior art, the coil parameter measurement process of the multi-relay WPT system is complex, the time consumption is long, and loops of coils at all levels are required to be disconnected.
A parameter test method of a multi-relay WPT system comprises the following specific steps:
s1: initializing parameters of a multi-relay WPT system, constructing a parameter array P to be estimated and a parameter deviation array A, and constructing a two-dimensional matrix Q by using the parameter array P to be estimated and the parameter deviation array A;
s2: measuring at each operating frequency f with the operating frequency f as a variable k Input phase angle theta of multi-relay WPT system in_k The direct-current voltage Vout_k of the load component is used for obtaining an input phase angle array theta and an output voltage array V;
s3: and (3) iteratively updating elements in the two-dimensional matrix Q through the input phase angle array theta and the output voltage array V, and estimating parameters of the multi-relay WPT system through the updated elements in the two-dimensional matrix Q.
Preferably, the step S1 of initializing parameters of the multi-relay WPT system and constructing the parameter array P to be estimated and the parameter deviation array a includes the specific steps of:
s1.1, setting the initial working frequency of the multi-relay WPT system as f 0 An initial estimated value of self inductance of an ith coil in q coils in a wireless energy transmission direction is L i0 The initial estimated value of the compensation capacitance of the ith coil is C i0 The initial estimated value of mutual inductance between coils is M ij0 The alternating load resistance is R Leq I, j=1, …, q, i+.j; constructing an initialization parameter array:
P 0 ＝[L 10 ,C 10 ,L 20 ,C 20 ,…L q0 ,C q0 ,M 120 ,M 130 ,…M 1q0 ,…M q-1q0 ]
the array P of parameters to be estimated is:
P＝[L 1 ,C 1 ,L 2 ,C 2 ,…L q ,C q ,M 12 ,M 13 ,…M 1q ,…M q-1q ]
s1.2, setting a parameter deviation array A:
A＝[a 1 ,a 2 ,a 3 ,…,a l ]
a i a deviation of the initial values of the parameters to be estimated is shown, coexisting in the case of a deviation.
Preferably, the two-dimensional matrix Q constructed in the step S1 has M rows and N columns, the column number N is equal to the number of elements of the array P, and the line number M is equal to the number of elements of the array A;
each element in the two-dimensional matrix Q represents the value of the nth parameter when the deviation of the corresponding parameter is m, and the higher the value is, the more likely the deviation exists in the parameter, and all elements of the two-dimensional matrix Q are set to 0 at the initial time.
Preferably, the specific method for measuring the input phase angle array θ and the output voltage array V in step S2 is as follows:
setting the frequency range [ f ] of the working operation of the multi-relay WPT system L ,f H ]The operating frequency of the power supply assembly is from f L Starting, gradually increasing to f with a step Δf H ；
At each operating frequency f k Under, the input phase angle theta of the multi-relay WPT system is measured in_k DC voltage V on load assembly out_k The method comprises the steps of carrying out a first treatment on the surface of the When the frequency change process is completed once, all the measurement results form an input phase angle array θ and an output voltage array V.
Preferably, the specific step of estimating the parameter in step S3 is as follows:
s3.1: setting the iteration times as W, setting the step number in each iteration as S, and setting the initial time W=1 and S=1;
s3.2: in the nth step of the kth iteration, the nth parameter of the multi-relay WPT system is iteratively updated by the nth element in the two-dimensional matrix Q, and the frequency f is calculated according to the updated parameter k System input phase angle estimation arrayAnd output voltage estimation array->
S3.3: by means of an input phase angle array θ and an output voltage array V and an input phase angle estimation arrayAnd output voltage estimation array->Calculating and updating the Q element value corresponding to the nth parameter;
s3.4: let n=n+1, repeat steps S3.2-S3.3, calculate and update the n+1th parameter and its corresponding Q element value;
s3.5: let k=k+1, if k+1>I max And selecting a deviation value corresponding to the maximum element from the nth column of the two-dimensional matrix Q to update the nth parameter, and taking the deviation value as a final parameter estimation value of the nth parameter, otherwise, returning to the step S3.2, wherein: i max Is the maximum number of iterations.
Preferably, the frequency f is calculated in step S3.2 k System input phase angle estimation arrayAnd output voltage estimation array->The specific steps of (a) are as follows:
s3.2.1: in the nth step of the kth iteration, the nth parameter is updated:
P(n)＝P 0 (n)·(1+a k,n )
wherein a is k,n For updating the deviation of the parameter P (n), ε is a randomly generated number, ε has a value of [0,1 ]]Between epsilon 0 Is a threshold value when epsilon is greater than or equal to epsilon 0 In this case, the deviation a corresponding to the row having the largest element value in A is selected from the nth column of the two-dimensional matrix Q i Updating the nth parameter in P, otherwise, when ε is less than ε 0 At the time, a deviation a is arbitrarily selected from A s Updating the nth parameter in P;
s3.2.2: after the nth parameter P (n) in P is updated, the frequency f is calculated according to the updated parameter k System input phase angle estimationArray of arraysAnd output voltage estimation array->
Preferably, in step S3.2, the specific steps of calculating and updating the Q element value corresponding to the nth parameter are as follows:
s3.3.1: let the number of frequency points used for measurement and calculation be N f Calculating square errors h between the system input phase angle estimated value and the measured input phase angle, and between the system output voltage estimated value and the measured output voltage:
s3.3.2: calculating the k iteration, and estimating the updated gain R by the n step parameter k,n The method comprises the following steps:
s3.3.3: the deviation a of the corresponding nth column in the two-dimensional matrix Q according to the following formula k,n Is updated by elements of (a):
where α is the learning rate, γ is the discount rate, k is the value before the kth iteration, and k+1 is the value after the kth iteration.
The system for testing the parameters of the multi-relay WPT system is used for realizing the method for testing the parameters of the multi-relay WPT system and comprises a power supply component, a load component, a measuring rack and an upper computer;
the multi-relay WPT system to be tested is arranged on the measuring rack, the output end of the power supply component is connected with the input end of the multi-relay WPT system, and the input end of the load component is connected with the output end of the multi-relay WPT system;
the power supply assembly comprises a first measurement recording device for measuring and recording data, the load assembly comprises a second measurement recording device for measuring and recording data, and the first measurement recording device and the second measurement recording device are in data communication with the upper computer.
Preferably, the power supply assembly further comprises a PFC direct current power supply, a DC-DC converter and a high frequency inverter;
the input of the PFC direct current power supply is V power frequency alternating current commercial power, and the output of the PFC direct current power supply is fixed direct current voltage serving as the input of the DC-DC converter; the output of the DC-DC converter is connected to the input of the high frequency inverter; the output of the high-frequency inverter is an output interface of the whole input power supply assembly and is used for connecting the input end of the multi-relay WPT system; the first measuring and recording device is connected with a direct current input end and an alternating current output end of the high-frequency inverter.
The load assembly further comprises a high frequency rectifier and an adjustable electronic load;
the input end of the high-frequency rectifier is an input interface of the whole output load assembly; the output end of the high-frequency rectifier is connected with the input end of the adjustable electronic load; the second measurement recording device is connected with the input end of the adjustable electronic load.
Preferably, the upper computer comprises a parameter estimation module, a man-machine interaction module and a circuit control module;
the input end of the parameter estimation module is connected with the output ends of a first measurement recording device and a second measurement recording device in the input power supply assembly and the load assembly;
the output end of the parameter estimation module is connected with the input end of the man-machine interaction module; the output end of the man-machine interaction module and the output end of the parameter estimation module are connected with the input end of the circuit control module;
the output end of the circuit control module is connected with the DC-DC converter, the high-frequency inverter, the first measurement recording device, the adjustable electronic load of the load assembly and the second measurement recording device of the input power assembly.
Due to the adoption of the technical scheme, the invention has the following advantages:
according to the multi-relay WPT system parameter testing method, the two-dimensional matrix Q is constructed through the parameter array P to be estimated and the parameter deviation array A, the two-dimensional matrix Q is updated in an iterative mode through the input phase angle and the output voltage, the parameters are estimated and calculated through the updated two-dimensional matrix Q, the loops of coils at all levels are not required to be disconnected in the whole parameter estimation process, the time consumption is short, and the parameter estimation accuracy is high.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof.
Drawings
The drawings of the present invention are described below.
Fig. 1 is a flowchart of a multi-relay WPT system parameter testing method of the present invention.
Fig. 2 is a schematic structural diagram of a multi-relay WPT system parameter testing apparatus according to the present invention.
In the figure: 1-a power supply assembly; 101-PFC direct current power supply; a 102-DC-DC converter; 103-a high frequency inverter; 104-a first measurement recording device; a 2-load assembly; 201-a high frequency rectifier; 202-an adjustable electronic load; 203-a second measurement logging device; 3-measuring a rack; 4-an upper computer; 401-a parameter estimation module; 402-a man-machine interaction module; 403-a circuit control module; 5-multiple relay WPT system.
Detailed Description
The invention is further described below with reference to the drawings and examples.
Example 1:
the parameter testing device of the multi-relay WPT system shown in fig. 2 comprises a power supply assembly 1, a load assembly 2, a measuring rack 3 and an upper computer 4;
the power supply assembly 1 comprises a PFC direct current power supply 101, a DC-DC converter 102, a high-frequency inverter 103 and a first measurement recording device 104, wherein the input of the PFC direct current power supply 101 is 220V power frequency alternating current commercial power, and the output of the PFC direct current power supply 101 is a fixed direct current voltage serving as the input of the DC-DC converter 102; the output of the DC-DC converter 102 is connected to the input of the high frequency inverter 103; the output of the high-frequency inverter 103 is an output interface of the whole input power supply assembly 1 and is used for connecting the input end of the multi-relay WPT system. The first measuring and recording device 104 is connected to the dc input and the ac output of the high-frequency inverter 103.
The load assembly 2 comprises a high frequency rectifier 201, an adjustable electronic load 202 and a second measurement logging device 203; the input end of the high-frequency rectifier 201 is an input interface of the whole output load assembly; the output end of the high-frequency rectifier 201 is connected with the input end of the adjustable electronic load 202; the second measurement logging device 203 is connected to the input of the adjustable electronic load 202.
The multi-relay WPT system 5 to be tested is arranged on the measurement bench 3.
The upper computer 4 comprises a parameter estimation module 401, a man-machine interaction module 402 and a circuit control module 403; the input end of the parameter estimation module 401 is connected with the output ends of the first measurement recording device 104 and the second measurement recording device 203 in the input power supply assembly 1 and the load assembly 2; the output end of the parameter estimation module 401 is connected with the input end of the man-machine interaction module 402; the output end of the man-machine interaction module 402 and the output end of the parameter estimation module 401 are connected with the input end of the circuit control module 403; the output of the circuit control module 403 is connected to the DC-DC converter 102, the high frequency inverter 103, the first measurement recording device 104, and the adjustable electronic load 202 and the second measurement recording device 203 of the load assembly 2 of the input power assembly 1.
Example 2:
the parameter testing method of the multi-relay WPT system shown in fig. 1 adopts the parameter testing device of the multi-relay WPT system in embodiment 1, taking a 5-coil multi-relay WPT system as an example (including a transmitting coil, 3 relay coils and a receiving coil which are sequentially arranged), the specific steps of the parameter testing method are as follows:
s1: initializing parameters of a multi-relay WPT system, constructing a parameter array P to be estimated and a parameter deviation array A, and constructing a two-dimensional matrix Q by using the parameter array P to be estimated and the parameter deviation array A, wherein the method comprises the following specific steps of:
s1.1, setting the initial working frequency of the multi-relay WPT system as f 0 An initial estimated value of self inductance of an ith coil in q coils in a wireless energy transmission direction is L i0 The initial estimated value of the compensation capacitance of the ith coil is C i0 The initial estimated value of mutual inductance between coils is M ij0 The alternating load resistance is R Leq I, j=1, …, q, i+.j; constructing an initialization parameter array:
P 0 ＝[L 10 ,C 10 ,L 20 ,C 20 ,…L q0 ,C q0 ,M 120 ,M 130 ,…M 1q0 ,…M q-1q0 ]
the array P of parameters to be estimated is:
P＝[L 1 ,C 1 ,L 2 ,C 2 ,…L q ,C q ,M 12 ,M 13 ,…M 1q ,…M q-1q ]
s1.2, setting a parameter deviation array A in a parameter estimation module:
A＝[a 1 ,a 2 ,a 3 ,…,a 100 ]＝[-0.2,-0.188,-0.186,…,0.186,0.188,0.2]
a i a deviation of the initial values of the parameters to be estimated is shown, for a total of 100 cases of deviation, namely from-0.2 to 0.2, with a step size of 0.02.
In the embodiment of the invention, the two-dimensional matrix Q is provided with M rows and N columns, the column number N is equal to the number of elements of the array P, and the line number M is equal to the number of elements of the array A;
each element in the two-dimensional matrix Q represents the value of the nth parameter when the deviation of the corresponding parameter is m, and the higher the value is, the more likely the deviation exists in the parameter, and all elements of the two-dimensional matrix Q are set to 0 at the initial time.
S2: measuring at each operating frequency f with the operating frequency f as a variable k Input phase angle theta of multi-relay WPT system in_k And the DC voltage Vo of the load assemblyut_k, and an input phase angle array theta and an output voltage array V are obtained, wherein the specific steps are as follows:
s2.1, inputting the operable frequency range [ f ] of the multi-relay WPT system into the upper computer L ,f H ]And the step length delta f of the frequency change in the frequency sweeping process; setting the direct current output voltage of the DC-DC converter and the load value of the adjustable electronic load in the upper computer according to the system power grade and the load range;
s2.2, the working frequency of the high-frequency inverter in the input power cabinet is from f L Starting, gradually increasing to f with a step Δf H . At each operating frequency f k The phase difference between the voltage and the current of the output end of the high-frequency inverter, namely the input phase angle theta of the multi-relay WPT system, is measured by a first measurement recording device in the power supply assembly in_k The method comprises the steps of carrying out a first treatment on the surface of the At the same time, the direct current voltage V on the adjustable electronic load is measured by a second measurement recording device in the load assembly out_k The method comprises the steps of carrying out a first treatment on the surface of the The measurement recording device transmits the measured data to the parameter estimation module; when the frequency change process is completed once, all the measurement results form an input phase angle array θ and an output voltage array V.
S3: the elements in the two-dimensional matrix Q are updated in an iterative manner through the input phase angle array theta and the output voltage array V, and parameters of the multi-relay WPT system are estimated through the updated elements in the two-dimensional matrix Q, and the method comprises the following specific steps of:
s3.1: setting the iteration times as W, setting the step number in each iteration as S, and setting the initial time W=1 and S=1;
s3.2: in the nth step of the kth iteration, the nth parameter of the multi-relay WPT system is iteratively updated by the nth element in the two-dimensional matrix Q, and the frequency f is calculated according to the updated parameter k System input phase angle estimation arrayAnd output voltage estimation array->
S3.3: by means of an input phase angle array θ and an output voltage array V and an input phase angle estimation arrayAnd output voltage estimation array->Calculating and updating the Q element value corresponding to the nth parameter;
s3.4: let n=n+1, repeat steps S3.2-S3.3, calculate and update the n+1th parameter and its corresponding Q element value;
s3.5: let k=k+1, if k+1>I max And selecting a deviation value corresponding to the maximum element from the nth column of the two-dimensional matrix Q to update the nth parameter, and taking the deviation value as a final parameter estimation value of the nth parameter, otherwise, returning to the step S3.2, wherein: i max Is the maximum number of iterations.
In the embodiment of the invention, the frequency f is calculated in step S3.2 k System input phase angle estimation arrayAnd output voltage estimation array->The specific steps of (a) are as follows:
s3.2.1: in the nth step of the kth iteration, the nth parameter is updated:
P(n)＝P 0 (n)·(1+a k,n )
wherein a is k,n For updating the deviation of the parameter P (n), ε is a randomly generated number, ε has a value of [0,1 ]]Between epsilon 0 Is a threshold value when epsilon is greater than or equal to epsilon 0 In this case, the deviation a corresponding to the row having the largest element value in A is selected from the nth column of the two-dimensional matrix Q i Updating the nth parameter in P, otherwise, when ε is less than ε 0 At the time, a deviation a is arbitrarily selected from A s Updating the nth parameter in P;
s3.2.2: after the nth parameter P (n) in P is updated, the frequency f is calculated according to the updated parameter k System input phase angle estimation arrayAnd output voltage estimation array->
In the embodiment of the present invention, the specific steps of calculating and updating the Q element value corresponding to the nth parameter in step S3.2 are:
s3.3.1: let the number of frequency points used for measurement and calculation be N f Calculating square errors h between the system input phase angle estimated value and the measured input phase angle, and between the system output voltage estimated value and the measured output voltage:
s3.3.2: calculating the k iteration, and estimating the updated gain R by the n step parameter k,n The method comprises the following steps:
s3.3.3: the deviation a of the corresponding nth column in the two-dimensional matrix Q according to the following formula k,n Is updated by elements of (a):
where α is the learning rate, γ is the discount rate, k is the value before the kth iteration, and k+1 is the value after the kth iteration.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.

Claims (10)

1. The parameter testing method of the multi-relay WPT system is characterized by comprising the following specific steps of:
s1: initializing parameters of a multi-relay WPT system, constructing a parameter array P to be estimated and a parameter deviation array A, and constructing a two-dimensional matrix Q by using the parameter array P to be estimated and the parameter deviation array A;
s2: measuring at each operating frequency f with the operating frequency f as a variable k Input phase angle theta of multi-relay WPT system in_k The direct-current voltage Vout_k of the load component is used for obtaining an input phase angle array theta and an output voltage array V;
s3: and (3) iteratively updating elements in the two-dimensional matrix Q through the input phase angle array theta and the output voltage array V, and estimating parameters of the multi-relay WPT system through the updated elements in the two-dimensional matrix Q.
2. The method for testing parameters of a multi-relay WPT system according to claim 1, wherein the initializing parameters of the multi-relay WPT system in step S1 and constructing the parameter array P to be estimated and the parameter deviation array a comprises the following specific steps:
s1.1, setting the initial working frequency of the multi-relay WPT system as f 0 An initial estimated value of self inductance of an ith coil in q coils in a wireless energy transmission direction is L i0 The initial estimated value of the compensation capacitance of the ith coil is C i0 The initial estimated value of mutual inductance between coils is M ij0 The alternating load resistance is R Leq I, j=1, …, q, i+.j; constructing an initialization parameter array:
P 0 ＝[L 10 ,C 10 ,L 20 ,C 20 ,…L q0 ,C q0 ,M 120 ,M 130 ,…M 1q0 ,...M q-1q0 ]
the array P of parameters to be estimated is:
P＝[L 1 ,C 1 ,L 2 ,C 2 ,…L q ,C q ,M 12 ,M 13 ,…M 1q ,...M q-1q ]
s1.2, setting a parameter deviation array A:
A＝[a 1 ,a 2 ,a 3 ,…,a l ]
a i a deviation of the initial values of the parameters to be estimated is shown, coexisting in the case of a deviation.
3. The method for testing parameters of a multi-relay WPT system according to claim 1, wherein the two-dimensional matrix Q constructed in the step S1 has M rows and N columns, the number of columns N is equal to the number of elements of the array P, and the number of rows M is equal to the number of elements of the array A;
each element in the two-dimensional matrix Q represents the value of the nth parameter when the deviation of the corresponding parameter is m, and the higher the value is, the more likely the deviation exists in the parameter, and all elements of the two-dimensional matrix Q are set to 0 at the initial time.
4. The method for testing the parameters of the multi-relay WPT system according to claim 1, wherein the specific method for measuring the input phase angle array θ and the output voltage array V in step S2 comprises the following steps:
setting the frequency range [ f ] of the working operation of the multi-relay WPT system L ,f H ]The operating frequency of the power supply assembly is from f L Starting, gradually increasing to f with a step Δf H ；
At each operating frequency f k Under, measure the multi-relay WPT systemInput phase angle theta in_k DC voltage V on load assembly out_k The method comprises the steps of carrying out a first treatment on the surface of the When the frequency change process is completed once, all the measurement results form an input phase angle array θ and an output voltage array V.
5. The method for testing parameters of a multi-relay WPT system according to claim 3, wherein the specific steps of estimating the parameters in step S3 are as follows:
s3.1: setting the iteration times as W, setting the step number in each iteration as S, and setting the initial time W=1 and S=1;
s3.2: in the nth step of the kth iteration, the nth parameter of the multi-relay WPT system is iteratively updated by the nth element in the two-dimensional matrix Q, and the frequency f is calculated according to the updated parameter k System input phase angle estimation arrayAnd output voltage estimation array->
S3.3: by means of an input phase angle array θ and an output voltage array V and an input phase angle estimation arrayAnd output voltage estimation array->Calculating and updating the Q element value corresponding to the nth parameter;
s3.4: let n=n+1, repeat steps S3.2-S3.3, calculate and update the n+1th parameter and its corresponding Q element value;
s3.5: let k=k+1, if k+1>I max And selecting a deviation value corresponding to the maximum element from the nth column of the two-dimensional matrix Q to update the nth parameter, and taking the deviation value as a final parameter estimation value of the nth parameter, otherwise, returning to the step S3.2, wherein:I max is the maximum number of iterations.
6. The method for testing parameters of a multi-relay WPT system according to claim 5, wherein the calculation in step S3.2 is performed at a frequency f k System input phase angle estimation arrayAnd output voltage estimation array->The specific steps of (a) are as follows:
s3.2.1: in the nth step of the kth iteration, the nth parameter is updated:
P(n)＝P 0 (n)·(1+a k,n )
wherein a is k,n For updating the deviation of the parameter P (n), ε is a randomly generated number, ε has a value of [0,1 ]]Between epsilon 0 Is a threshold value when epsilon is greater than or equal to epsilon 0 In this case, the deviation a corresponding to the row having the largest element value in A is selected from the nth column of the two-dimensional matrix Q i Updating the nth parameter in P, otherwise, when ε is less than ε 0 At the time, a deviation a is arbitrarily selected from A s Updating the nth parameter in P;
s3.2.2: after the nth parameter P (n) in P is updated, the frequency f is calculated according to the updated parameter k System input phase angle estimation arrayAnd output voltage estimation array->
7. The method for testing the parameters of the multi-relay WPT system according to claim 5, wherein the calculating and updating the Q element value corresponding to the nth parameter in step S3.2 comprises the following specific steps:
s3.3.1: let the number of frequency points used for measurement and calculation be N f Calculating square errors h between the system input phase angle estimated value and the measured input phase angle, and between the system output voltage estimated value and the measured output voltage:
s3.3.2: calculating the k iteration, and estimating the updated gain R by the n step parameter k,n The method comprises the following steps:
s3.3.3: the deviation a of the corresponding nth column in the two-dimensional matrix Q according to the following formula k,n Is updated by elements of (a):
where α is the learning rate, γ is the discount rate, k is the value before the kth iteration, and k+1 is the value after the kth iteration.
8. A multi-relay WPT system parameter testing apparatus, which is configured to implement the multi-relay WPT system parameter testing method as claimed in claims 1 to 7, and includes a power supply assembly (1), a load assembly (2), a measurement rack (3), and an upper computer (4);
the multi-relay WPT system (5) to be tested is arranged on the measuring rack (3), the output end of the power supply assembly (1) is connected with the input end of the multi-relay WPT system (5), and the input end of the load assembly (2) is connected with the output end of the multi-relay WPT system (5);
the power supply assembly (1) comprises a first measurement recording device (104) for measuring and recording data, the load assembly (2) comprises a second measurement recording device (203) for measuring and recording data, and the first measurement recording device (104) and the second measurement recording device (203) are in data communication with the upper computer (4).
9. A multi-relay WPT system parameter testing apparatus as claimed in claim 8, wherein the power supply assembly (1) further comprises a PFC direct current power supply (101), a DC-DC converter (102) and a high frequency inverter (103);
the input of the PFC direct current power supply (101) is 220V power frequency alternating current commercial power, and the output of the PFC direct current power supply is a fixed direct current voltage serving as the input of the DC-DC converter (102); an output of the DC-DC converter (102) is connected to an input of the high frequency inverter (103); the output of the high-frequency inverter (103) is an output interface of the whole input power supply assembly (1) and is used for connecting the input end of the multi-relay WPT system; the first measuring and recording device (104) is connected to the DC input and the AC output of the high-frequency inverter (103).
The load assembly (2) further comprises a high frequency rectifier (201) and an adjustable electronic load (202);
the input end of the high-frequency rectifier (201) is an input interface of the whole output load assembly; the output end of the high-frequency rectifier (201) is connected with the input end of the adjustable electronic load (202); the second measurement recording device (203) is connected to the input of the adjustable electronic load (202).
10. The multi-relay WPT system parameter testing apparatus of claim 8, wherein the host computer (4) includes a parameter estimation module (401), a man-machine interaction module (402), and a circuit control module (403);
the input end of the parameter estimation module (401) is connected with the output ends of a first measurement recording device (104) and a second measurement recording device (203) in the input power supply assembly (1) and the load assembly (2);
the output end of the parameter estimation module (401) is connected with the input end of the man-machine interaction module (402); the output end of the man-machine interaction module (402) and the output end of the parameter estimation module (401) are connected with the input end of the circuit control module (403);
the output end of the circuit control module (403) is connected with the DC-DC converter (102), the high-frequency inverter (103), the first measurement recording device (104) and the adjustable electronic load (202) and the second measurement recording device (203) of the load assembly (2) of the input power assembly (1).
CN202311551692.4A 2023-11-21 2023-11-21 Multi-relay WPT system parameter testing method and device Pending CN117572123A (en)

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