CN113193663B - Load and mutual inductance dual-parameter identification method for magnetic coupling wireless power transmission system - Google Patents
Load and mutual inductance dual-parameter identification method for magnetic coupling wireless power transmission system Download PDFInfo
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- CN113193663B CN113193663B CN202110473412.7A CN202110473412A CN113193663B CN 113193663 B CN113193663 B CN 113193663B CN 202110473412 A CN202110473412 A CN 202110473412A CN 113193663 B CN113193663 B CN 113193663B
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2611—Measuring inductance
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
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Abstract
The invention provides a load and mutual inductance dual-parameter identification method of a magnetic coupling wireless power transmission system. When the load impedance and mutual inductance parameters are calculated, communication and complex algorithm programs are not needed, the load and mutual inductance parameters can be quickly and accurately calculated only by adjusting the system to work in a floating-frequency real eigenstate and then directly detecting the primary voltage and current, and meanwhile, high-power and high-efficiency electric energy transmission can be guaranteed.
Description
Technical Field
The invention relates to the technical field of wireless power transmission, in particular to a load and mutual inductance dual-parameter identification method for a magnetic coupling wireless power transmission system.
Background
With the development of wireless power transmission technology, the transmission performance is improved, and the increase of transmission distance becomes a hot research direction of wireless power transmission. In the practical application of the MC-WPT technology, the magnetic coupling mechanism inevitably has the conditions of offset and the like, so that the mutual inductance is changed. Meanwhile, most of the existing electric appliances adopt lithium batteries or lead storage batteries as power supply energy sources, and the equivalent resistance of the battery type load is changed in real time in the charging process. The mutual inductance and the load are important parameters influencing the performance of the MC-WPT system, and the effective identification of the mutual inductance and the load parameters of the MC-WPT system is the key for realizing the effective and accurate control of the system.
At present, the technical schemes of MC-WPT system parameter identification can be divided into two categories: one is single parameter identification and the other is dual parameter identification.
The single parameter identification is typically a load identification. The mutual inductance is assumed as a fixed value, then a corresponding system model is constructed based on impedance analysis, energy conservation, fundamental wave-harmonic wave relation and the like, and finally the load is identified. The method is complex in modeling and complex in calculation, and has extremely limited application field.
The double-parameter identification is to identify the mutual inductance and the load parameter at the same time. The existing double-parameter identification method mainly comprises two types of identification based on an intelligent algorithm and radio frequency identification. The intelligent algorithm selects a proper network structure according to the input and output quantity of the system, and realizes the identification of system parameters by using a corresponding algorithm program. The method needs a large number of iterative algorithms, so that the identification time consumption is increased, and the identification precision is reduced when the operating frequency is close to the secondary side inherent resonant frequency. The rfid is based on parameters such as real-time feedback load of communication, but the communication device will increase the circuit complexity and the cost.
Aiming at the defects of the double-parameter identification technology, in 2014, Korea Belgium flood et al provide a double-parameter (load and mutual inductance) identification method based on an S/S type MC-WPT system by disturbing the system operation frequency, wherein the condition that the system is in the normal operation frequency is defined as a normal working mode, and the system enters the identification mode after the system operation frequency is disturbed. The input voltage and the input current are respectively sampled in two modes, and then the load and mutual inductance parameter analytic expressions are respectively obtained through mathematical derivation. Although the method only needs to detect the input current and voltage of the primary side and control the duty ratio to change the output voltage according to the identified condition, the energy transmission capability of the system obviously slides down when the system is switched to the identification mode.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to overcome the defects of the prior art and provides a load and mutual inductance dual-parameter identification method for a magnetic coupling wireless power transmission system. According to the method, communication is not needed, a complex algorithm is not needed, the load and the mutual inductance value of the system can be quickly and accurately obtained only by adjusting the working frequency of the system to the real eigen frequency point and then detecting the primary side current in the state, and meanwhile stable energy transmission can be achieved in a parameter identification mode.
The technical scheme is as follows: in order to achieve the purpose, the invention provides the following technical scheme:
a method for identifying load and mutual inductance double parameters of a magnetic coupling wireless power transmission system, wherein the magnetic coupling wireless power transmission system comprises an input power supply, a primary side RLC loop and a secondary side RLC loop, and the method comprises the following steps:
(1) determining the working frequency f of the magnetic coupling wireless power transmission system in the fixed-frequency real eigenstate according to the primary RLC loop parameter and the secondary RLC loop parameter 0 ；
(2) Adjusting the output frequency f of the input power supply x Simultaneously measuring the output voltage and the output current of the primary side of the magnetic coupling wireless electric energy transmission system, and stopping adjustment when the phases of the primary side voltage and the current are the same; at this time, if f x ＝f 0 Then re-executing step (2), if f x ＜f 0 Or f x ＞f 0 If so, the magnetic coupling wireless electric energy transmission system works in a floating frequency real eigenstate;
(3) under the floating-frequency real eigenstate, measuring the input voltage and the input current of the primary side of the magnetic coupling wireless electric energy transmission system;
(4) calculating an impedance value of the load according to the following formula:
wherein R is L Representing the impedance value, u, of the load 1 、i 1 Respectively representing the output voltage and the output current, R, of the primary side of the magnetic coupling wireless power transmission system P1 、R P2 Respectively representing the internal resistance of a transmitting coil and the internal resistance of a receiving coil;
(5) calculating a coupling coefficient k:
wherein, ω is x Is f x Corresponding angular frequency, ω 0 Is f 0 The corresponding angular frequency of the frequency of,
wherein ρ represents a characteristic impedance of the magnetically coupled wireless power transfer system;
(6) according to
And calculating the mutual inductance of the magnetic coupling wireless power transmission system.
The principle of the invention is as follows: the frequency of the switching tube is adjusted, and three zero phase angular frequencies can be obtained by detecting the primary side voltage and the current. The middle one is the current common working frequency which can be directly calculated according to the inductance and the capacitance and is not changed along with the mutual inductance and the load, and the middle one is called a fixed-frequency real eigenstate.
In addition, two zero phase angle frequencies are distributed on two sides of the fixed frequency and are called floating frequency real eigenstates which change along with mutual inductance and load. The original voltage and voltage are detected, so that the system works in a frequency state smaller than or larger than the fixed-frequency real eigenfrequency, and mutual inductance and load identification are carried out.
For the load and mutual inductance dual-parameter identification method of the magnetic coupling wireless power transmission system, a plurality of optional modes are provided below, but the method is not an additional limitation to the overall scheme, and is only a further supplement or a preference.
Optionally, the input power source includes a dc voltage source and an inverter; and (2) in the step (1), the frequency of the input power supply is adjusted by adjusting the working frequency of the inverter.
Optionally, the inverter is a full-bridge inverter or a half-bridge inverter.
Has the beneficial effects that: compared with the prior art, the invention has the following advantages:
the load and mutual inductance double-parameter testing method of the magnetic coupling wireless power transmission system provided by the invention does not need communication and complex algorithm programs, only needs to adjust the system to work in a floating-frequency real eigenstate, and then directly detects the primary voltage and current, so that the load and mutual inductance parameters can be rapidly and accurately calculated, and meanwhile, high-power and high-efficiency power transmission can be ensured.
Drawings
FIG. 1 is an overall flow chart of the present invention;
fig. 2 is a circuit diagram of a magnetic coupling wireless power transmission system according to an embodiment;
fig. 3 is a flowchart according to an embodiment.
Detailed Description
The invention aims to provide a double-parameter test scheme for the load and the mutual inductance of a magnetic coupling wireless power transmission system, which can quickly and accurately obtain the load and the mutual inductance value of the system and can realize stable transmission performance in a parameter identification mode.
In view of this, the present invention provides the following specific solutions:
a double-parameter test method for load and mutual inductance of a magnetic coupling wireless power transmission system is disclosed, wherein the magnetic coupling wireless power transmission system comprises an input power supply, a primary side RLC loop and a secondary side RLC loop; the flow of the method is shown in fig. 1, and comprises the following steps:
(1) determining the working frequency f of the magnetic coupling wireless power transmission system in the fixed-frequency real eigenstate according to the primary RLC loop parameter and the secondary RLC loop parameter 0 ；
(2) Adjusting the output frequency f of the input power supply x Simultaneously measuring the output voltage and the output current of the primary side of the magnetic coupling wireless electric energy transmission system, and stopping adjustment when the phases of the primary side voltage and the current are the same; at this time, if f x ＝f 0 Then re-execute step (2), if f x ＜f 0 Or f x ＞f 0 If so, the magnetic coupling wireless power transmission system works in a floating frequency real eigenstate;
(3) under the floating-frequency real eigenstate, measuring the input voltage and the input current of the primary side of the magnetic coupling wireless electric energy transmission system;
(4) calculating an impedance value of the load according to the following formula:
wherein R is L Representing the impedance value of the load, u 1 、i 1 Respectively representing the output voltage and the output current, R, of the primary side of the magnetic coupling wireless power transmission system P1 、R P2 Respectively representing the internal resistance of a transmitting coil and the internal resistance of a receiving coil;
(5) calculating a coupling coefficient k:
wherein, ω is x Is f x Corresponding angular frequency, ω 0 Is f 0 The corresponding angular frequency of the frequency,
wherein ρ represents a characteristic impedance of the magnetically coupled wireless power transfer system;
(6) according to
And calculating the mutual inductance of the magnetic coupling wireless power transmission system.
The invention will be further described with reference to the accompanying drawings and specific embodiments. It is to be understood that the present invention may be embodied in various forms, and that there is no intention to limit the invention to the specific embodiments illustrated, but on the contrary, the intention is to cover some exemplary and non-limiting embodiments shown in the attached drawings and described below.
Example (b):
in this embodiment, a circuit diagram of a magnetic coupling wireless power transmission system is exemplarily given, and specifically, as shown in fig. 2, the whole circuit includes a direct current voltage source, a full bridge inverter, a primary RLC loop and a secondary RLC loop, which are sequentially cascaded. Wherein the output voltage value of the DC voltage source is u 1 Self-inductance L of the transmitting coil 1 Internal resistance of the transmitting coil R P1 Is transmitted back toWay compensation capacitor C 1 Self-inductance of receiving coil L 2 Internal resistance R of the receiving coil P2 And a receiving loop compensation capacitor C 2 . For the sake of calculation, in this embodiment, L is set 1 ＝L 2 ＝L，C 1 ＝C 2 C. According to the parameters of the primary RLC loop and the secondary RLC loop, the working angular frequency omega of the system in the fixed-frequency real eigenstate can be determined 0 Operating frequency f 0 And a characteristic impedance p, wherein,
f 0 ＝ω 0 /2π，
the input impedance of the system can be obtained from the KVL equation for the circuit shown in fig. 2:
wherein i 1 Representing the input current on the primary side, omega the angular frequency at which the system operates, R 2 ＝R P2 +R L ，
R L Representing the impedance value of the load and M representing the mutual inductance.
Let X 1 ＝X 2 X; when Z is eq When purely resistive, Z eq ＝R eq ，X eq When it is 0, the primary voltage is in phase with the current. Under such conditions, according to formula (1):
obtaining a solution:
changing omega to omega 0 Defined as a fixed-frequency real eigenstate, ω ═ ω + ，ω＝ω - Defined as the floating-frequency real eigenstate, the input impedance is purely resistive in both cases.
①ω＝ω 0 When the temperature of the water is higher than the set temperature,
the fixed-frequency real eigen state is the most common working mode at present, the primary side circuit and the secondary side circuit are both in a resonance state at the moment, the total input impedance is pure resistance, zero phase angle operation can be realized, and high energy efficiency transmission is ensured. However, in this operating mode, as can be seen from equation (4), the reflected impedance is determined by the load and the mutual inductance parameter, and it is difficult to directly identify the two parameters by detecting the primary voltage and the primary current.
②ω＝ω + Or ω ═ ω - When the utility model is used, the water is discharged,
R eq ＝R P1 +R P2 +R L (5)
as can be seen from equation (5), the input impedance of the system in this operating mode is completely determined by the load. Therefore, in the working mode, only the primary voltage and the primary current need to be detected, and the load resistance value can be quickly and accurately obtained, namely
On this basis, from equation (3), an expression of the coupling coefficient k can be obtained, assuming that ω is ω at this time - Then k is expressed as formula (6):
wherein:
finally, according to the formula
The mutual inductance M can be calculated.
When the system works in the floating-frequency real eigenstate, the energy efficiency expression of the system is shown as the formula (7) and the formula (8):
efficiency of
Output power
Internal resistance of coil R P1 ，R P2 The energy efficiency of the system in the floating frequency mode is very high, and the zero phase angle operation can be realized.
In summary, the floating-frequency real eigenstate can be used as a parameter identification mode, and only the operating frequency of the inverter needs to be adjusted, so that the whole system works in the floating-frequency real eigenstate, for example: adjusting the operating frequency of the inverter to less than f 0 Is marked as f - Then ω is - ＝2πf - By detecting the primary current and the switching frequency, the load and mutual inductance parameters of the system can be quickly and accurately obtained based on the formula (6) and the formula (7). And meanwhile, stable energy transmission can be ensured in the mode.
Based on the above analysis, the test flow of the load and mutual inductance parameters of the magnetic coupling wireless power transmission system shown in fig. 1 is shown in fig. 3, which is specifically as follows:
s1: inputting the input voltage u of the system to be identified 1 Self-inductance L of the transmitting coil 1 Internal resistance of the transmitting coil R P1 And a transmission loop compensation capacitor C 1 Self-inductance L of the receiving coil 2 Internal resistance R of the receiving coil P2 And a receiving loop compensation capacitor C 2 . Without loss of generality has L 1 ＝L 2 ＝L，C 1 ＝C 2 ＝C；
S2: determining the angular frequency ω of operation of the system 0 Operating frequency f 0 And a characteristic impedance p, wherein,
f 0 ＝ω 0 /2π，
s3: regulating the switching frequency f of the inverter so that it is less than the system operating frequency f 0 And the primary voltage and current are in the same phase (here, only by ω) - As an example, ω + Also possible);
s4: the switching frequency at this time is detected and recorded as f - At the time of primary side current amplitude i 1 ；
S5: by passing
Load resistance R can be obtained by calculation L ；
S6: determining angular frequency omega of parameter identification pattern - And an impedance factor alpha 0 Wherein, ω is - ＝2πf - ，
S7: by passing
Calculating a coupling coefficient k of the available system;
s8: by passing
The mutual inductance of the system can be calculated.
It is to be understood that the features listed above for the different embodiments may be combined with each other to form further embodiments within the scope of the invention, where technically feasible. Furthermore, the particular examples and embodiments of the invention described are non-limiting, and various modifications may be made in the structure, steps, and sequence set forth above without departing from the scope of the invention.
Claims (3)
1. A load and mutual inductance double-parameter identification method for a magnetic coupling wireless power transmission system, wherein the magnetic coupling wireless power transmission system comprises an input power supply, a primary side RLC loop and a secondary side RLC loop, and the method is characterized by comprising the following steps:
(1) determining the working frequency f of the magnetic coupling wireless power transmission system in the fixed-frequency real eigenstate according to the primary RLC loop parameter and the secondary RLC loop parameter 0 ；
(2) Adjusting the output frequency f of the input power supply x Simultaneously measuring the output voltage and the output current of the primary side of the magnetic coupling wireless electric energy transmission system, and stopping adjustment when the phases of the primary side voltage and the current are the same; at this time, if f x ＝f 0 Then re-execute step (2), if f x <f 0 Or f x >f 0 If so, the magnetic coupling wireless electric energy transmission system works in a floating frequency real eigenstate;
(3) under the floating-frequency real eigenstate, measuring the input voltage and the input current of the primary side of the magnetic coupling wireless electric energy transmission system;
(4) calculating an impedance value of the load according to the following formula:
wherein R is L Representing the impedance value of the load, u 1 、i 1 Respectively representing the output voltage and the output current, R, of the primary side of the magnetic coupling wireless power transmission system P1 、R P2 Respectively representing the internal resistance of a transmitting coil and the internal resistance of a receiving coil;
(5) calculating a coupling coefficient k:
wherein, ω is x Is f x Corresponding angular frequency, ω 0 Is f 0 The corresponding angular frequency of the frequency of,
wherein ρ represents a characteristic impedance of the magnetically coupled wireless power transfer system;
(6) according to
And calculating the mutual inductance of the magnetic coupling wireless power transmission system.
2. The method for identifying the load and mutual inductance of the magnetically coupled wireless power transmission system according to claim 1, wherein the input power source comprises a direct current voltage source and an inverter; and (2) in the step (1), the frequency of the input power supply is adjusted by adjusting the working frequency of the inverter.
3. The method of claim 2, wherein the inverter is a full-bridge inverter or a half-bridge inverter.
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| CN105141046A (en) * | 2015-10-26 | 2015-12-09 | 重庆大学 | SP type ICPT system load and mutual inductance identification method |
| CN107294225A (en) * | 2017-07-19 | 2017-10-24 | 重庆大学 | The IPT system loads of secondary shunt compensation and mutual inductance parameter identification method |
| CN110112841A (en) * | 2019-05-28 | 2019-08-09 | 中国电力科学研究院有限公司 | A kind of load of wireless charging system and mutual inductance parameter identification method and system |
| CN111371196A (en) * | 2020-04-16 | 2020-07-03 | 中国矿业大学 | Floating-frequency real eigenstate magnetic coupling wireless power transmission system and design method thereof |
| CN111725900A (en) * | 2020-04-16 | 2020-09-29 | 中国矿业大学 | Fixed-frequency real eigenstate magnetic coupling wireless power transmission system and design method thereof |
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|---|---|---|---|---|
| CN105141046A (en) * | 2015-10-26 | 2015-12-09 | 重庆大学 | SP type ICPT system load and mutual inductance identification method |
| CN107294225A (en) * | 2017-07-19 | 2017-10-24 | 重庆大学 | The IPT system loads of secondary shunt compensation and mutual inductance parameter identification method |
| CN110112841A (en) * | 2019-05-28 | 2019-08-09 | 中国电力科学研究院有限公司 | A kind of load of wireless charging system and mutual inductance parameter identification method and system |
| CN111371196A (en) * | 2020-04-16 | 2020-07-03 | 中国矿业大学 | Floating-frequency real eigenstate magnetic coupling wireless power transmission system and design method thereof |
| CN111725900A (en) * | 2020-04-16 | 2020-09-29 | 中国矿业大学 | Fixed-frequency real eigenstate magnetic coupling wireless power transmission system and design method thereof |
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