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WO2023115630A1 - Système et procédé de transmission d'énergie sans fil - Google Patents

Système et procédé de transmission d'énergie sans fil Download PDF

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Publication number
WO2023115630A1
WO2023115630A1 PCT/CN2021/143119 CN2021143119W WO2023115630A1 WO 2023115630 A1 WO2023115630 A1 WO 2023115630A1 CN 2021143119 W CN2021143119 W CN 2021143119W WO 2023115630 A1 WO2023115630 A1 WO 2023115630A1
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WIPO (PCT)
Prior art keywords
voltage
phase
matrix converter
wireless power
power transmission
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2021/143119
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English (en)
Chinese (zh)
Inventor
肖扬
杨勇
王铀程
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Suzhou University
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Suzhou University
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Filing date
Publication date
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Publication of WO2023115630A1 publication Critical patent/WO2023115630A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from AC input or output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
    • H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
    • H02M7/12—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M7/219—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration

Definitions

  • the present invention relates to the field of electronic technology, in particular to a wireless power transmission system and method.
  • Matrix converter The matrix converter is a new type of AC-AC power converter, which does not require an intermediate DC energy storage link, and can directly realize the conversion of AC phase, amplitude, frequency and other parameters.
  • Wireless power transmission refers to the conversion of electrical energy into other forms of relay energy through the transmitter, and after a certain distance is transmitted through the air, the relay energy is converted into electrical energy through the receiver to realize wireless power transmission.
  • WPT refers to wireless power transfer.
  • the purpose of the present invention is to provide a wireless power transmission system and method to solve the problem that the existing matrix converter cannot satisfy high power and has no direct load voltage/current control capability.
  • the present invention provides a wireless power transmission system and method, including:
  • Three-phase AC input terminal a three-phase matrix converter including six bidirectional switches, a transmitting terminal, a receiving terminal, and a digital signal processor;
  • the three-phase AC input terminal is used to transmit the input voltage to the three-phase matrix converter
  • the digital signal processor is used to calculate and modulate the set load voltage and the actual load voltage after detecting the grid voltage phase value, generate a PWM signal, and transmit the PWM signal to the three-phase matrix converter;
  • the three-phase matrix converter is configured to receive the PWM signal and the input voltage, control the on-off of the bidirectional switch in the three-phase matrix converter according to the PWM signal, and output a high-frequency voltage;
  • the transmitting end is used for the transmitting coil to be powered by the high-frequency voltage, so that it generates a high-frequency magnetic field under the excitation of the power supply;
  • the receiving end is used for generating current under the action of the high-frequency magnetic field.
  • the three-phase matrix converter includes:
  • each bidirectional switch includes two MOSFETs.
  • the digital signal processor includes:
  • Proportional-integral controller digital phase-locked loop, PWM generator
  • the proportional-integral controller is used to use the difference between the set load voltage and the actual load voltage as an error to generate a reference vector
  • the digital phase-locked loop is used to detect the phase value of the grid voltage and select the target sector and the effective voltage vector corresponding to the target sector in the six predefined sectors according to the phase value, so as to utilize the space
  • the vector modulation method synthesizes the reference vector to obtain the reference vector
  • each sector includes 6 effective voltage vectors and 3 zero voltage vectors;
  • the PWM generator is used to generate a PWM signal based on the driving of the reference vector, control the on-off of the six bidirectional switches in the three-phase matrix converter, and output a target high voltage corresponding to the set load voltage frequency voltage.
  • the three-phase power input terminal includes:
  • the three-phase power input is used to provide power to the wireless power transfer system
  • the input filter is used to effectively filter out a frequency point of a specific frequency in the power line or frequencies other than the frequency point to obtain a power signal of a specific frequency.
  • the transmitting end includes:
  • Transmitter compensation capacitor C T transmitter compensation inductance L f1 , transmitter coil L T ;
  • the receiver includes:
  • the receiver includes:
  • the diode rectifier bridge is used for stabilizing the DC voltage at the receiving end.
  • a wireless power transmission method comprising:
  • the coupling uses the high-frequency magnetic field to act on the receiving end, the coupling generates current to realize wireless power transmission.
  • the three-phase matrix converter includes:
  • each bidirectional switch includes two MOSFETs.
  • using the digital signal processor to detect the grid voltage phase value and then calculate and modulate the actual load voltage to obtain a PWM signal, and transmitting the PWM signal to the three-phase matrix converter includes:
  • said digital signal processor comprises a proportional-integral controller, a digital phase-locked loop and a PWM generator;
  • the difference between the set load voltage and the actual load voltage is used as an error to generate a reference vector
  • the modulation method synthesizes the reference vector to obtain the reference vector
  • the reference vector is used to drive the PWM generator to generate a PWM signal, to control the on-off of six bidirectional switches in the three-phase matrix converter, and to output the target high-frequency voltage corresponding to the set load voltage.
  • the three-phase AC input terminal is used to provide the input voltage to the three-phase matrix converter
  • the digital signal processor is used to detect the phase value of the grid voltage to Calculate and modulate the actual load voltage to obtain a PWM signal, transmit the PWM signal to the three-phase matrix converter, use the three-phase matrix converter to receive the PWM signal and the input voltage, and control the PWM signal according to the PWM signal
  • the bidirectional switch in the three-phase matrix converter is turned on and off, and a high-frequency voltage is output, and the high-frequency voltage is used to excite the transmitting end to generate a high-frequency magnetic field, and the high-frequency magnetic field is used to act on the receiving end, and the coupling generates Electric current for wireless power transmission.
  • the present invention realizes the application of high power level by controlling the on-off of the two-way switch in the matrix processor and outputting high-frequency voltages of different frequencies.
  • the load voltage calculation generates a reference vector to realize the ability to directly control the load voltage and load
  • Fig. 1 is a structural diagram of a wireless power transmission system provided by the present invention
  • Fig. 2 is the three-phase grid voltage and the corresponding sector provided by the present invention
  • Fig. 3 is a flowchart of a first specific embodiment of a wireless power transmission system provided by the present invention.
  • Fig. 4 is the direct load voltage control diagram of the digital signal processor provided by the present invention.
  • Fig. 5 is the reference vector composite figure provided by the present invention.
  • Fig. 6 is a vector sequence diagram of the power switch provided by the present invention.
  • the core of the present invention is to provide a wireless power transmission system and method. By modulating the switching state of a three-phase matrix converter, the application of high power level of wireless power transmission is satisfied, and the ability to directly control the load voltage and load current is realized.
  • a wireless power transmission system provided by the present invention includes:
  • Three-phase AC input terminal a three-phase matrix converter including six bidirectional switches, a transmitting terminal, a receiving terminal, and a digital signal processor;
  • the three-phase AC input terminal includes a three-phase power input and an input filter, the three-phase power input is used to provide three-phase power for the entire system, and the input filter is used to control the specific frequency in the power line The frequency point or frequencies other than this frequency point are effectively filtered to obtain a power signal of a specific frequency;
  • the three-phase matrix converter includes three bridge arms, the same bridge arm includes two bidirectional switches, and the three-phase power supply is converted into a high-frequency voltage by adjusting the closed state of the bidirectional switches;
  • the digital signal processor includes a proportional-integral controller, a digital phase-locked loop, and a PWM generator, and the proportional-integral controller is used to use the difference between the set load voltage and the actual load voltage as an error to generate a reference vector, so
  • the digital phase-locked loop is used to detect the grid voltage phase value and select the target sector and the effective voltage vector corresponding to the target sector in the 6 predefined sectors according to the phase value, so as to utilize the space vector
  • the modulation method synthesizes the reference vector to obtain the reference vector;
  • each sector includes 6 effective voltage vectors and 3 zero voltage vectors;
  • the PWM generator is used to generate a PWM signal based on the driving of the reference vector, control the on-off of the six bidirectional switches in the three-phase matrix converter, and output a target high voltage corresponding to the set load voltage frequency voltage.
  • the transmitting end includes a transmitting end compensation capacitor C T , a transmitting end compensation inductance L f1 , and a transmitting end transmitting coil L T ;
  • the receiving end includes a receiving end compensation capacitor C R , a receiving end compensation inductance L f2 , and a receiving end receiving coil L R ;
  • the three-phase AC input terminal is used to transmit the input voltage to the three-phase matrix converter
  • the digital signal processor is used to calculate and modulate the set load voltage and the actual load voltage after detecting the grid voltage phase value, generate a PWM signal, and transmit the PWM signal to the three-phase matrix converter;
  • the three-phase matrix converter is configured to receive the PWM signal and the input voltage, control the on-off of the bidirectional switch in the three-phase matrix converter according to the PWM signal, and output a high-frequency voltage;
  • the transmitting end is used to generate a high-frequency magnetic field under the excitation of the high-frequency voltage
  • the receiving end is used for generating current under the action of the high-frequency magnetic field.
  • the wireless power transmission system provided in this embodiment can directly realize the transformation of the phase, amplitude and frequency of alternating current, and through different voltage vectors, there are selective outputs on the transmitting coil, and the three-phase power supply can be transformed into high-frequency voltage.
  • the load voltage can be directly controlled, and the LCL type compensation is added to make the current mutual inductance of each branch less affected, the system is stable, and has better robustness.
  • the receiving end uses the diode rectifier bridge to stabilize the DC voltage.
  • Figure 3 is a flow chart of the first specific embodiment of a wireless power transmission method provided by the present invention, and the specific operation steps are as follows:
  • Step S301 using the filter to filter the high-frequency grid current for the three-phase AC power supply to obtain an input voltage
  • the wireless power transmission system proposed by the present invention introduces an LC filter, so the input voltage is obtained as:
  • u A , u B , u C are grid voltages
  • u iA , u iB , u iC are input voltages
  • R LA , R LB , R LC are resistances of input filters
  • LA , L B , L C are input
  • the inductance value of the filter, i A , i B , i C is the gate current.
  • C A , C B , and C C represent the capacitance values of the input filter.
  • Step S302 Using the digital signal processor to detect the grid voltage phase value, calculate and modulate the set load voltage and the actual load voltage to obtain a PWM signal, and transmit the PWM signal to the three-phase matrix converter;
  • the digital signal processor includes a proportional-integral controller, a digital phase-locked loop and a PWM generator;
  • the difference between the set load voltage and the actual load voltage is used as an error to generate a reference vector
  • the modulation method synthesizes the reference vector to obtain the reference vector
  • each sector and its corresponding voltage vector As shown in Table 1, each sector and its corresponding voltage vector
  • V 0 is the zero vector and V ref is the reference vector.
  • the reference vector is:
  • V ref d 1 u ab +d 2 u ac +d 0 V 0
  • the duty cycle of the voltage vector is calculated as follows:
  • m is the modulation result generated by the PI controller.
  • ⁇ g is the phase calculated by the phase-locked loop.
  • the reference vector is used to drive the PWM generator to generate a PWM signal, to control the on-off of six bidirectional switches in the three-phase matrix converter, and to output the target high-frequency voltage corresponding to the set load voltage.
  • Step S303 using the three-phase matrix converter to receive the PWM signal and the input voltage, control the on-off of the bidirectional switch in the three-phase matrix converter according to the PWM signal, and output a high-frequency voltage;
  • the switching state of the three-phase matrix converter is processed through modulation, that is, the required high-frequency voltage is output;
  • the matrix converter turns on S 1 , S 4 , turns off switches S 2 , S 3 , S 5 , and S 6 to output voltage u ab ;
  • the matrix converter turns on S 2 , S 3 , turns off switches S 1 , S 4 , S 5 , and S 6 to output voltage u ba ;
  • the three-phase matrix converter receives the PWM signal and the input voltage, controls the on-off of the bidirectional switch in the three-phase matrix converter according to the PWM signal, and outputs a high-frequency voltage;
  • the vector sequence of the power switches showing the vector arrangement of the first sector direct load voltage control.
  • two voltage vectors are placed at the beginning of a resonant cycle, and one zero-voltage vector is obtained from three zero-voltage vectors to ensure a lower number of switching states.
  • the other negative and zero vectors make up the other half of the resonant period.
  • the transmitter current can also be expressed as:
  • Step S304 Using the high-frequency voltage to excite the transmitter to generate a high-frequency magnetic field
  • Step S305 using the high-frequency magnetic field to act on the receiving end, coupling to generate current, and realizing wireless power transmission.
  • the wireless power transmission system eliminates the disadvantage of unstable electrolytic capacitors by using matrix transformation, and enhances the system power density.
  • high High-frequency voltage realizes the application of high power level.
  • the proportional-integral controller in the digital signal processor calculates the set load voltage and the actual load voltage to generate a reference vector, and realizes the ability to directly control the load voltage and load current.
  • each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same or similar parts of each embodiment can be referred to each other.
  • the description is relatively simple, and for relevant details, please refer to the description of the method part.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Ac-Ac Conversion (AREA)

Abstract

Sont divulgués dans la présente invention un système et un procédé de transmission d'énergie sans fil. Le système de transmission d'énergie sans fil comprend une extrémité d'entrée de courant alternatif triphasé, un convertisseur matriciel triphasé, une extrémité de transmission et une extrémité de réception. Le procédé de transmission d'énergie sans fil consiste à : filtrer un courant de réseau haute fréquence à partir d'une alimentation électrique en courant alternatif triphasé en utilisant un filtre, de façon à obtenir une tension d'entrée ; effectuer un calcul sur une tension de charge définie et une tension de charge réelle en utilisant un processeur de signal numérique, de façon à obtenir un signal PWM ; commander le démarrage et l'arrêt d'un convertisseur matriciel triphasé en utilisant le signal PWM et entrer la tension d'entrée dans un processeur matriciel pour obtenir une tension haute fréquence ; exciter une extrémité de transmission en utilisant la tension haute fréquence de façon à générer un champ magnétique haute fréquence ; et utiliser le champ magnétique haute fréquence pour agir sur une extrémité de réception, et générer un courant au moyen d'un couplage, de façon à obtenir une transmission d'énergie sans fil. Au moyen de la présente invention, l'application d'un niveau d'énergie élevé est obtenue en commandant le démarrage et l'arrêt d'un commutateur bidirectionnel dans un processeur matriciel ; et la capacité à commander directement une tension de charge et un courant de charge peut être obtenue au moyen d'un processeur de signal numérique.
PCT/CN2021/143119 2021-12-22 2021-12-30 Système et procédé de transmission d'énergie sans fil Ceased WO2023115630A1 (fr)

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CN202111584688.9 2021-12-22
CN202111584688.9A CN114421634A (zh) 2021-12-22 2021-12-22 一种无线电能传输系统以及方法

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