CN116106622A - High-frequency electric parameter measurement method and device for wireless electric energy transmission system of electric automobile - Google Patents
High-frequency electric parameter measurement method and device for wireless electric energy transmission system of electric automobile Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
- G01R22/061—Details of electronic electricity meters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
- B60L53/12—Inductive energy transfer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/06—Arrangements for measuring electric power or power factor by measuring current and voltage
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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- Y02T10/00—Road transport of goods or passengers
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Abstract
A method and a device for measuring high-frequency electric parameters of an electric automobile wireless electric energy transmission system, wherein the method comprises the following steps: under the system working condition, collecting the incoming line voltage and current of a primary induction coil in the wireless electric energy transmission system of the electric automobile in a parallel connection mode of voltage dividing resistors; wherein the value range of the single voltage dividing resistor is
m is the number of voltage dividing resistors, R 1 Z is the resistance of each voltage dividing resistor L The inductive reactance of a primary induction coil of the wireless power transmission system of the electric automobile; carrying out high-frequency parametric decomposition on the incoming voltage and current of the primary induction coil, and solving fundamental wave and harmonic signal components; instantaneous power using fundamental and various subharmonic componentsIs calculated; the instantaneous power is used to calculate the electrical energy. The problems of higher measurement cost, complex equation solving, difficult high-voltage measurement and larger errors caused by harmonic waves and skin effect in the traditional technical scheme are solved.
Description
Technical Field
The invention belongs to the technical field of electric power detection, and particularly relates to a high-frequency electric parameter measurement method and device of an electric automobile wireless electric energy transmission system.
Background art in recent years, with rapid development of informatization, automation and electronic technology and improvement of living standard of people, wireless power transmission technology has a wide application prospect with portability without physical wiring and manual replacement of batteries. The magnetic coupling type wireless power transmission technology is the most popular and mature technology at present, and has the characteristic of still being capable of transmitting high-power energy under the condition of long distance. With the development of new energy automobiles, the magnetic coupling type wireless electric energy transmission technology is applied to the field of electric automobiles, namely the wireless electric energy transmission technology of the electric automobiles. It is becoming an emerging technology that is of increasing interest to researchers.
The magnetic coupling type wireless power transmission technology realizes the transmission of power through the strong magnetic coupling resonance principle of a transmitting coil and a receiving coil. In the wireless power transmission technology of the electric automobile, in order to ensure high efficiency and stability of the operation of the coupling mechanism, the typical working frequency range of the wireless power transmission system is generally 81.39kHz-90kHz, the standard frequency is 85kHz, and the frequency is high. The detection and measurement of the high-frequency electric parameters are important to control strategies such as automatic tuning control, driving signal synchronization, energy transmission direction and the like of the wireless electric energy transmission system of the electric automobile. However, the high frequency and high voltage operating conditions of the wireless charging system of the electric vehicle also present challenges for accurate measurement of electrical parameters during energy transfer.
In the prior art, a Fourier transform algorithm is utilized for data sampling and processing, but due to the high working frequency required by the wireless electric energy transmission system of the electric automobile, only an instrument with extremely high sampling frequency can achieve better precision of measurement, so that the measurement cost is relatively high. Data sampling and processing is performed using wavelet algorithms, but they also require the support of precision instruments and high measurement costs at high operating frequencies. Fundamental and harmonic components are obtained using a bandpass filter. However, the passband range of the filter is limited by the bandwidth of the active device, and the application of the filter to wireless power transmission of an electric automobile can cause serious electric parameter measurement errors. The change of the magnetic field parameters is converted into voltage or current information, but the alternating current has stronger skin effect under the high-frequency working condition, and the non-uniformity of the magnetic field distribution can seriously influence the accuracy of electric parameter measurement. The equivalent resistance of the transformer core loss is obtained by respectively testing loop resistances of the secondary short-circuit primary pressurization, the secondary open-circuit primary pressurization, the primary short-circuit secondary pressurization and the primary open-circuit secondary pressurization and adopting an equation solving method, but the high-frequency electric parameters of the wireless electric energy transmission system of the electric automobile comprise harmonic components which are complex, and the equation solving method is difficult to obtain the relation among components and is complex to solve.
According to the technical means, if the traditional low-frequency electric signal extraction method is applied to the wireless electric energy transmission system of the electric automobile, a measuring instrument with extremely high sampling frequency is needed, and the cost is relatively high; or by the bandwidth limitations of the active devices in the band pass filter, resulting in serious measurement errors; or the magnetic field distribution is influenced by skin effect under the high-frequency working condition, and the measurement precision of the high-frequency electric parameters is seriously influenced by the non-uniformity of the magnetic field distribution; or the equation solving method is difficult to obtain the relation among the components, and the solving is complex. The conventional technical scheme is no longer suitable for the high-frequency electrical parameter measurement scenario.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a high-frequency electric parameter measuring method and device for an electric automobile wireless electric energy transmission system, solves the problems of higher measuring cost, complex equation solving, high-voltage measuring difficulty and larger errors caused by harmonic waves and skin effects in the traditional technical scheme, and provides the value range of a single divider resistor under a lower error level.
The invention adopts the following technical scheme.
The invention provides a high-frequency electric parameter measurement method of an electric automobile wireless electric energy transmission system, which comprises the following steps:
step 1, under the system working condition, collecting the incoming line voltage and current of a primary induction coil in a wireless electric energy transmission system of an electric automobile in a parallel connection mode of voltage dividing resistors; wherein the value range of the single voltage dividing resistor is
m is the number of voltage dividing resistors, R 1 Z is the resistance of each voltage dividing resistor L The inductive reactance of a primary induction coil of the wireless power transmission system of the electric automobile;
step 2, carrying out high-frequency parameter decomposition on the incoming voltage and current of the primary induction coil, and solving fundamental wave and harmonic signal components;
and 4, calculating electric energy by using the instantaneous power.
Preferably, step 1 comprises:
step 1.1, collecting the incoming line current I of the primary induction coil by using a shunt 1 ；
And 1.2, collecting the incoming line voltage U of the primary induction coil in a parallel connection mode of voltage dividing resistors.
Preferably, in step 1.2, m resistance values are used, each of which is R 1 After the resistors of the (a) are connected in series, carrying out resistance voltage division on the voltages at two ends of a primary induction coil of the wireless electric energy transmission system of the electric automobile, forming high resistance by m resistors with the same resistance value, and measuring the voltage U at two ends of a single resistor 1 Wherein m > 3, the voltage at two ends of the primary induction coil of the wireless power transmission system of the electric vehicle to be solved is U=mU 1 。
The parallel formula of the voltage dividing resistor is as follows:
wherein m is the number of divider resistors, R 1 Z is the resistance of each voltage dividing resistor L The inductive reactance of a primary induction coil of the wireless power transmission system of the electric automobile;
will induce the reactance formula Z L ＝jnωL 1 Substituting the parallel formula of the voltage dividing resistor, then:
wherein j is an imaginary symbol, n is harmonic frequency, ω is the working frequency of the wireless electric energy transmission system of the electric automobile, L 1 The inductance of the primary induction coil of the wireless power transmission system of the electric automobile.
The equivalent resistance value of the m voltage dividing resistors connected in parallel with the primary induction coil after being connected in series is close to the impedance of the primary induction coil of the wireless power transmission system, namely mR 1 //Z L ≈Z L 。
mR at fifth harmonic 1 //Z L ≥0.98Z L I.e. at error level
In the case of a single voltage dividing resistor, the value range is +.>
Preferably, the instantaneous power P is as follows:
in the method, in the process of the invention,
U 1 、U i the fundamental voltage and each subharmonic voltage components,
I 1 、I i the fundamental current and each subharmonic current components,
n is the number of the largest harmonic wave,
Preferably, the electric energy W, w= Σpdt is calculated using the instantaneous power.
The invention also provides a high-frequency electric parameter measuring device of the wireless electric energy transmission system of the electric automobile, which is used for realizing the measuring method and comprises the following steps:
the system comprises a partial pressure acquisition module, a high-frequency parameter decomposition module, an instantaneous power calculation module and an electric energy calculation module;
the partial pressure acquisition module is used for acquiring the incoming line voltage and current of a primary induction coil in the wireless electric energy transmission system of the electric automobile in a parallel connection mode of partial pressure resistors under the system working condition; wherein the value range of the single voltage dividing resistor is
m is the number of the voltage dividing resistors, R1 is the resistance value of each voltage dividing resistor, ZL is the inductance of a primary induction coil of the wireless electric energy transmission system of the electric automobile;
the high-frequency parameter decomposition module is used for carrying out high-frequency parameter decomposition on the incoming voltage and current of the primary induction coil and solving fundamental wave and harmonic signal components;
the instantaneous power calculation module is used for calculating instantaneous power P by utilizing the fundamental wave and each subharmonic component;
and the electric energy calculation module is used for calculating electric energy by utilizing the instantaneous power.
The input end of the partial pressure acquisition module is connected with the primary induction coil, the partial pressure acquisition module transmits acquired voltage and current data to the high-frequency parameter decomposition module, the high-frequency parameter decomposition module decomposes and solves the voltage and current data to obtain fundamental wave and harmonic wave components, the fundamental wave and harmonic wave components are transmitted to the instantaneous power calculation module to output instantaneous power, and the instantaneous power is transmitted to the electric energy calculation module to output electric energy.
Compared with the prior art, the invention has the beneficial effects that the use of magnetic materials can be avoided by adopting a mode of parallel connection of the divider resistors during measurement, thereby effectively avoiding the influence of harmonic waves and skin effects caused by alternating current under high-frequency working conditions caused by ferromagnetic materials and improving the measurement precision of electric parameters.
According to the method provided by the invention, the voltage divider facing the high-frequency high-voltage working condition and the higher harmonic is designed, so that the influence of the harmonic and skin effect caused by alternating current under the high-frequency working condition caused by ferromagnetic materials is avoided, and the measurement accuracy of the electric parameters is improved.
The invention measures the electric parameters under the higher harmonic wave and the fundamental wave, reduces the electric parameter measurement error, is not limited by the bandwidth of an active device in the filter, and improves the electric parameter measurement precision.
The invention does not need a measuring instrument with extremely high sampling frequency to collect high-frequency electric parameters, and reduces the measuring cost.
The method and the device solve the problem that the solving of the equation solving method is complex and the relation among the components is difficult to obtain.
The invention solves the problem that the wireless electric energy transmission system of the electric automobile is difficult to measure under the high-pressure condition.
The invention provides the reference range of the single voltage dividing resistor under the lower error level of the fifth harmonic wave, and is convenient for the measurement and reference of staff.
Drawings
FIG. 1 is a flow chart of a high-frequency electric parameter measurement method of an electric automobile wireless electric energy transmission system;
fig. 2 is a block diagram of a wireless power transmission system of an electric vehicle according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a primary high-frequency voltage measurement method of an electric vehicle wireless power transmission system according to an embodiment of the invention;
fig. 4 is a schematic diagram of a primary side voltage dividing resistor connection mode of an electric vehicle wireless power transmission system according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The embodiments described herein are merely some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art without inventive faculty, are within the scope of the invention, based on the spirit of the invention.
On the one hand, the invention provides a high-frequency electric parameter measuring method of an electric automobile wireless electric energy transmission system, as shown in fig. 1, comprising the following steps:
step 1, under the system working condition, collecting the incoming line voltage and current of a primary induction coil in a wireless electric energy transmission system of an electric automobile in a parallel connection mode of voltage dividing resistors; wherein the value range of the single voltage dividing resistor is
m is the number of voltage dividing resistors, R 1 Z is the resistance of each voltage dividing resistor L The inductive reactance of the primary induction coil of the wireless power transmission system of the electric automobile.
The structure of the wireless power transmission system of the electric automobile is shown in fig. 2, and comprises: a primary side system 1, a secondary side system 2, a measurement system 3; the primary side system l is inductively connected to the secondary side system 2.
The primary side system 1 includes: a power supply module 11, a high-frequency inverter module 12, a primary side compensation network module 13, a primary induction coil 14; the power supply module is connected with one side of the high-frequency inversion module, the other side of the high-frequency inversion module is connected with one side of the primary side compensation network module, and the other side of the primary side compensation network module is connected with the primary induction coil.
The secondary side system 2 includes: a secondary induction coil 21, a secondary side compensation network module 22, a rectifying and filtering module 23 and a load module 24; the secondary induction coil is connected with one side of the secondary side compensation network module, the other side of the secondary side compensation network module is connected with one side of the rectifying and filtering module, and the other side of the rectifying and filtering module is connected with the load module.
The primary induction coil is inductively coupled to the secondary induction coil.
The measurement system 3 includes: the partial pressure acquisition module 31, the high-frequency parameter decomposition module 32, the instantaneous power calculation module 33 and the electric energy calculation module 34; the input end of the partial pressure acquisition module is connected with the primary induction coil, the partial pressure acquisition module transmits acquired voltage and current data to the high-frequency parameter decomposition module, the high-frequency parameter decomposition module decomposes and solves the voltage and current data to obtain fundamental wave and harmonic wave components, the fundamental wave and harmonic wave components are transmitted to the instantaneous power calculation module to output instantaneous power, and the instantaneous power is transmitted to the electric energy calculation module to output electric energy.
Specifically, step 1 includes:
step 1.1, collecting the incoming line current I of the primary induction coil by using a shunt 1 ；
And 1.2, collecting the incoming line voltage U of the primary induction coil in a parallel connection mode of voltage dividing resistors.
The primary high-frequency voltage measurement method of the wireless electric energy transmission system of the electric automobile is shown in fig. 3, fig. 4 is a schematic diagram of a primary side voltage dividing resistor connection mode of the wireless electric energy transmission system of the electric automobile, and m resistance values are R 1 After the resistors of the (a) are connected in series, carrying out resistance voltage division on the voltages at two ends of a primary induction coil of the wireless electric energy transmission system of the electric automobile, forming high resistance by m resistors with the same resistance value, and measuring the voltage U at two ends of a single resistor 1 Wherein m > 3, the voltage at two ends of the primary induction coil of the wireless power transmission system of the electric vehicle to be solved is U=mU 1 ；
According to a parallel formula of the resistance:
wherein m is the number of divider resistors, R 1 Z is the resistance of each voltage dividing resistor L The inductive reactance of the primary induction coil of the wireless power transmission system of the electric automobile.
The adoption of the parallel connection mode of the voltage dividing resistors can avoid the use of magnetic materials, further effectively avoid the influence of harmonic waves and skin effect caused by alternating current under the high-frequency working condition caused by ferromagnetic materials, and improve the measurement accuracy of electric parameters.
According to the inductive reactance formula:
Z L ＝jnωL 1
wherein j is an imaginary symbol, n is harmonic frequency, ω is the working frequency of the wireless electric energy transmission system of the electric automobile, L 1 The inductance of the primary induction coil of the wireless power transmission system of the electric automobile;
substituting the inductance formula into the resistance parallel formula, then:
furthermore, in order to make the parallel voltage dividing resistors at two ends of the primary induction coil of the wireless power transmission system of the electric automobile have the smallest influence on the resonance characteristics of the system, the equivalent resistance value of the m voltage dividing resistors connected in series and then connected in parallel with the primary induction coil of the wireless power transmission system approaches to the impedance of the primary induction coil of the wireless power transmission system, namely mR 1 //Z L ≈Z L ；
Further, the method comprises the steps of,
furthermore, because the electric automobile wireless power transmission system has higher harmonic waves which are not easy to ignore under the high-frequency working condition, mR is generated when the electric automobile wireless power transmission system has five harmonic waves 1 //Z L ≥0.98Z L For reference, i.e. at a lower error level
When a single voltage is dividedThe value range of resistance is->
Step 2, carrying out high-frequency parametric decomposition on the incoming voltage and current of the primary induction coil, solving fundamental wave and harmonic signal components, and respectively marking the fundamental wave voltage and each subharmonic voltage component as U 1 、U i The fundamental wave current and each subharmonic current component are respectively marked as I 1 、I i Wherein the angle mark i corresponds to harmonic frequency, i is more than or equal to 3.
and 4, calculating electric energy W, W= [ pi ] Pdt by using the instantaneous power.
The present disclosure may be a system, method, and/or computer program product. The computer program product may include a computer readable storage medium having computer readable program instructions embodied thereon for causing a processor to implement aspects of the present disclosure.
The invention also provides a high-frequency electric parameter measuring device of the wireless electric energy transmission system of the electric automobile, which comprises: the system comprises a partial pressure acquisition module, a high-frequency parameter decomposition module, an instantaneous power calculation module and an electric energy calculation module;
the partial pressure acquisition module is used for acquiring the incoming line voltage and current of a primary induction coil in the wireless electric energy transmission system of the electric automobile in a parallel connection mode of partial pressure resistors under the system working condition; wherein the value range of the single voltage dividing resistor is
m is the number of voltage dividing resistors, R 1 Z is the resistance of each voltage dividing resistor L The inductive reactance of a primary induction coil of the wireless power transmission system of the electric automobile;
the high-frequency parameter decomposition module is used for carrying out high-frequency parameter decomposition on the incoming voltage and current of the primary induction coil and solving fundamental wave and harmonic signal components;
the instantaneous power calculation module is used for calculating instantaneous power P by utilizing the fundamental wave and each subharmonic component;
and the electric energy calculation module is used for calculating electric energy by utilizing the instantaneous power.
The computer readable storage medium may be a tangible device that can hold and store instructions for use by an instruction execution device. The computer readable storage medium may be, for example, but not limited to, an electronic storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium would include the following: portable computer disks, hard disks, random Access Memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static Random Access Memory (SRAM), portable compact disk read-only memory (CD-ROM), digital Versatile Disks (DVD), memory sticks, floppy disks, mechanical coding devices, punch cards or in-groove structures such as punch cards or grooves having instructions stored thereon, and any suitable combination of the foregoing. Computer-readable storage media, as used herein, are not to be construed as transitory signals per se, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (e.g., optical pulses through fiber optic cables), or electrical signals transmitted through wires.
The computer readable program instructions described herein may be downloaded from a computer readable storage medium to a respective computing/processing device or to an external computer or external storage device over a network, such as the internet, a local area network, a wide area network, and/or a wireless network. The network may include copper transmission cables, fiber optic transmissions, wireless transmissions, routers, firewalls, switches, gateway computers and/or edge servers. The network interface card or network interface in each computing/processing device receives computer readable program instructions from the network and forwards the computer readable program instructions for storage in a computer readable storage medium in the respective computing/processing device.
Computer program instructions for performing the operations of the present disclosure can be assembly instructions, instruction Set Architecture (ISA) instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source or object code written in any combination of one or more programming languages, including an object oriented programming language such as Smalltalk, c++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The computer readable program instructions may be executed entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of remote computers, the remote computer may be connected to the user computer through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (e.g., connected through the internet using an internet service provider). In some embodiments, aspects of the present disclosure are implemented by personalizing electronic circuitry, such as programmable logic circuitry, field Programmable Gate Arrays (FPGAs), or Programmable Logic Arrays (PLAs), with state information of computer readable program instructions, which can execute the computer readable program instructions.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution 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 skilled 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 high-frequency electric parameter measurement method of the wireless electric energy transmission system of the electric automobile is characterized by comprising the following steps of:
step 1, in the systemUnder the condition of the system working, the line incoming voltage and current of a primary induction coil in the wireless electric energy transmission system of the electric automobile are collected in a parallel connection mode of voltage dividing resistors; wherein the value range of the single voltage dividing resistor is
m is the number of voltage dividing resistors, R 1 Z is the resistance of each voltage dividing resistor L The inductive reactance of a primary induction coil of the wireless power transmission system of the electric automobile;
step 2, carrying out high-frequency parameter decomposition on the incoming voltage and current of the primary induction coil, and solving fundamental wave and harmonic signal components;
step 3, calculating instantaneous power by utilizing the fundamental wave and each subharmonic component;
and 4, calculating electric energy by using the instantaneous power.
2. The method for measuring the high-frequency electric parameters of the wireless electric energy transmission system of the electric automobile according to claim 1, comprising the following steps:
the step 1 comprises the following steps:
step 1.1, collecting the incoming line current I of the primary induction coil by using a shunt 1 ；
And 1.2, collecting the incoming line voltage U of the primary induction coil in a parallel connection mode of voltage dividing resistors.
3. The method for measuring the high-frequency electric parameters of the wireless electric energy transmission system of the electric automobile according to claim 1, comprising the following steps:
in step 1.2, m resistance values are R 1 After the resistors of the (a) are connected in series, carrying out resistance voltage division on the voltages at two ends of a primary induction coil of the wireless electric energy transmission system of the electric automobile, forming high resistance by m resistors with the same resistance value, and measuring the voltage U at two ends of a single resistor 1 Wherein m > 3, the voltage at two ends of the primary induction coil of the wireless power transmission system of the electric vehicle to be solved is U=mU 1 。
4. The method for measuring the high-frequency electric parameters of the wireless electric energy transmission system of the electric automobile according to claim 3, comprising the following steps:
the parallel formula of the voltage dividing resistor is as follows:
wherein m is the number of divider resistors, R 1 Z is the resistance of each voltage dividing resistor L The inductive reactance of a primary induction coil of the wireless power transmission system of the electric automobile;
will induce the reactance formula Z L ＝jnωL 1 Substituting the parallel formula of the voltage dividing resistor, then:
wherein j is an imaginary symbol, n is harmonic frequency, ω is the working frequency of the wireless electric energy transmission system of the electric automobile, L 1 The inductance of the primary induction coil of the wireless power transmission system of the electric automobile.
5. The method for measuring the high-frequency electric parameters of the wireless electric energy transmission system of the electric automobile according to claim 4, comprising the following steps:
the equivalent resistance value of the m voltage dividing resistors connected in parallel with the primary induction coil after being connected in series is close to the impedance of the primary induction coil of the wireless power transmission system, namely mR 1 //Z L ≈Z L 。
6. The method for measuring the high-frequency electric parameters of the wireless electric energy transmission system of the electric automobile according to claim 5, comprising the following steps:
mR at fifth harmonic 1 //Z L ≥0.98Z L I.e. at error level
In the case of a single voltage dividing resistor, the value range is +.>
7. The method for measuring the high-frequency electric parameters of the wireless electric energy transmission system of the electric automobile according to claim 1, comprising the following steps:
the instantaneous power P is as follows:
in the method, in the process of the invention,
U 1 、U i the fundamental voltage and each subharmonic voltage components,
I 1 、I i the fundamental current and each subharmonic current components,
n is the number of the largest harmonic wave,
8. The method for measuring the high-frequency electric parameters of the wireless electric energy transmission system of the electric automobile according to claim 1, comprising the following steps:
the electric energy W, w= ≡pdt is calculated using the instantaneous power.
9. A high-frequency electric parameter measuring device of an electric vehicle wireless electric energy transmission system, for implementing the method of any one of claims 1 to 8, comprising:
the system comprises a partial pressure acquisition module, a high-frequency parameter decomposition module, an instantaneous power calculation module and an electric energy calculation module;
the partial pressure acquisition module is used for acquiring the incoming line voltage and current of a primary induction coil in the wireless electric energy transmission system of the electric automobile in a parallel connection mode of partial pressure resistors under the system working condition; wherein the value range of the single voltage dividing resistor is
m is the number of voltage dividing resistors, R 1 Z is the resistance of each voltage dividing resistor L The inductive reactance of a primary induction coil of the wireless power transmission system of the electric automobile;
the high-frequency parameter decomposition module is used for carrying out high-frequency parameter decomposition on the incoming voltage and current of the primary induction coil and solving fundamental wave and harmonic signal components;
the instantaneous power calculation module is used for calculating instantaneous power P by utilizing the fundamental wave and each subharmonic component;
and the electric energy calculation module is used for calculating electric energy by utilizing the instantaneous power.
10. The device for measuring high-frequency electric parameters of the wireless electric energy transmission system of the electric automobile according to claim 9, wherein,
the input end of the partial pressure acquisition module is connected with the primary induction coil, the partial pressure acquisition module transmits acquired voltage and current data to the high-frequency parameter decomposition module, the high-frequency parameter decomposition module decomposes and solves the voltage and current data to obtain fundamental wave and harmonic wave components, the fundamental wave and harmonic wave components are transmitted to the instantaneous power calculation module to output instantaneous power, and the instantaneous power is transmitted to the electric energy calculation module to output electric energy.
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