CN108631576B - Power conversion circuit - Google Patents
Power conversion circuit Download PDFInfo
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- CN108631576B CN108631576B CN201710166622.5A CN201710166622A CN108631576B CN 108631576 B CN108631576 B CN 108631576B CN 201710166622 A CN201710166622 A CN 201710166622A CN 108631576 B CN108631576 B CN 108631576B
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- 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
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/425—Arrangements for improving power factor of AC input using a single converter stage both for correction of AC input power factor and generation of a high frequency AC output voltage
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- 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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
- H02P27/085—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a power conversion circuit, which comprises a rectifying module (1), an inductor (2), a capacitor (3) and an inverter circuit (4), wherein the inverter circuit (4) is connected with a motor (6), a motor control module (12), a current control module (13) and a PWM (pulse width modulation) module are sequentially connected with one another (14), a voltage detection module (5) is arranged on the capacitor (3) in parallel, the voltage detection module (5) is connected with a reference waveform calculation module (11), the reference waveform calculation module (11) is connected with the motor control module (12), and the reference waveform calculation module (11) is used for calculating the bus voltage u detected by the voltage detection module (5)dcDetermining a bus voltage reference waveform iq_waveform_Ref_dcSaid motor control module (12) being responsive to said bus voltage reference waveform iq_waveform_Ref_dcDetermining a q-axis improved torque current reference Iq_Ref_g。
Description
Technical Field
The invention relates to the field of air conditioner circuits, in particular to a power conversion circuit.
Background
In the prior art, a Field Oriented Control (FOC) technology is often used to Control the rotation speed of a motor, and a working block diagram of a power conversion circuit for controlling the rotation speed of the motor by using the FOC is shown in fig. 2, and the Control flow thereof is as follows:
1) the motor control module receives two-phase alternating current i in three-phase alternating current output from the inverter circuituAnd ivReceiving a motor rotor position angle theta detected by a position sensor on the motor, and receiving a voltage signal u of an alternating current power supplyac；
2) The motor control module stores a motor rotating speed reference value omegar_refCalculating a q-axis torque current reference value I according to the formula set (1)qRef and d-axis current reference value Id_Ref：
Wherein, Kp1、Ki1And a and b are parameters for field debugging.
3) The current control module receives a q-axis torque current reference value I sent by the motor control moduleqReference value of current of _Refand d axisdRef, and receives a two-phase alternating current iu、ivAnd receiving the motor rotor position angle theta detected by a position sensor on the motor, and calculating the q-axis voltage u according to a formula group (2)qAnd d-axis voltage ud：
Wherein, Kp2、Ki2Is a parameter for field debugging.
4) The PWM generator is used for generating a q-axis voltage u according to the received q-axis voltageqD-axis voltage udMotor rotor position angle theta and bus capacitor voltage u detected by position sensor on motordcCalculating the on-off duty ratio p of three upper bridge IGBTs of the inverter circuit according to a formula group (3)u、pvAnd pwThe three upper bridge IGBTs of the inverter circuit are respectively enabled to be according to pu、pvAnd pwThe switching states of the lower bridge IGBT and the upper bridge IGBT are opposite:
when the magnetic field orientation control technology is actually used, K should be adjusted according to engineering application conditionsp1、Kp2、Kp3、Ki1、Ki2、Ki3A and b to allow stable and reliable operation of the motor.
The Field Oriented Control (FOC) is a prior art, the related principles of the present invention are not repeated, and the related technical principles and parameter definitions can refer to but are not limited to the article "magnetic Field oriented Control principle and characteristic analysis", author: menyanjia, zhao guang, and a paper "research on field oriented control of permanent magnet synchronous motors", authors: and (7) is also referred to.
In the prior art, a Power conversion circuit of an air conditioner is shown in fig. 3, because a Load formed by an inverter circuit and a motor is a Constant Power Load (CPL), a waveform distortion exists in a complete machine input current, an input Power factor is low, and a current harmonic is large, specifically, regarding that a Constant Power Load causes a motor Power factor to become low and a current harmonic to become large, reference may be made to, but not limited to, a "bidirectional Buck/Boost converter control strategy for counteracting an influence of a negative impedance characteristic of the Constant Power Load", author: zhang Xuhui; the article "synchronous generator with constant power load stability analysis", author: high morning glory; article "a novel alternating current constant power load simulation model", author: the dungeon and Yanjun.
Disclosure of Invention
An object of the present invention is to provide a power conversion circuit, in which a load formed by an inverter circuit and a motor is a pure resistive load, so as to increase a power factor of the power conversion circuit.
Specifically, the invention is realized by the following technical scheme:
the utility model provides a power conversion circuit, power conversion circuit includes rectifier module, inductor, condenser and inverter circuit, inverter circuit is connected with the motor, and motor control module, current control module and PWM modulation module connect gradually, and voltage detection module sets up on the condenser in parallel, voltage detection module is connected with reference waveform calculation module, reference waveform calculation module is connected with motor control module, reference waveform calculation module is according to the generating line voltage u that voltage detection module detecteddcDetermining a bus voltage reference waveform iq_waveform_Ref_dcThe motor control module is used for controlling the motor according to the bus voltage reference waveform iq_waveform_Ref_dcDetermining a q-axis improved torque current reference Iq_Ref_g。
A power conversion circuit control method using the aforementioned power conversion circuit, the method comprising:
according to bus voltage udcBy the formula
Determining a reference waveform iq_waveform_Ref_dcAccording to said reference waveform iq_waveform_Ref_dcDetermining a q-axis improved torque current reference IqRef _ g, q-axis improved torque current reference IqRef g and d-axis current reference IdRef act together to control the power variation of the motor.
Preferably, the method comprises:
step 1: the reference waveform calculation module receives the bus voltage u detected by the voltage detection moduledc；
Step 2: the reference waveform calculating module calculates the reference waveform according to a formula
Determining a bus voltage reference waveform iq_waveform_Ref_dc；
And step 3: the motor control module is based on the AC voltage uacFirst phase current iuSecond phase current ivReference value omega of motor speedr_refThe position angle theta of the motor rotor is calculated to obtain a d-axis current reference value IdRef and q-axis torque current peak value reference value iq_Ref_peak；
And 4, step 4: the motor control module is according to formula Iq_Ref_g＝iq_Ref_peak*iq_waveform_Ref_dcDetermining a q-axis improved torque current reference Iq_Ref_g；
And 5: the current control module improves a torque current reference value I according to the q axisqRef g and d-axis current reference IdRef, the power variation of the motor is controlled.
Preferably, the step 3 includes:
according to formula sets
Determining a d-axis current reference value IdRef and q-axis torque current peak value reference value iq_Ref_peak。
Preferably, the step 5 includes:
step 51: the current control module improves a torque current reference value I according to the q axisqRef g and d-axis current reference IdRef, calculating to obtain a q-axis improved voltage uq_gAnd d-axis voltage ud；
Step 52: PWM modulation module improves voltage u according to q axisq_gAnd d-axis voltage udOutputting a PWM waveform meeting the requirement so thatThe circuit load appears as a purely resistive load.
Preferably, the step 51 includes:
the current control module is according to formula group
Determining q-axis improvement voltage uq_gAnd d-axis voltage ud。
Preferably, the step 52 includes:
step 521: PWM modulation module according to formula group
Determining the duty cycle p of each IGBT switch in an inverter circuitu_g、pv_gAnd pw_g；
Step 522: three upper bridge IGBTs of the inverter circuit are respectively in accordance with pu_g、pv_gAnd pw_gThe switching states of the lower bridge IGBT and the upper bridge IGBT are opposite.
The invention has the beneficial effects that: by reference of the torque current I to the q axisqAnd determining Ref to ensure that the load formed by the inverter circuit and the motor is a pure resistive load, so that the power factor of the power conversion circuit is increased.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a power conversion circuit according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating a method of magnetic field orientation control in the prior art;
fig. 3 is a schematic diagram of a power conversion circuit in the prior art.
Description of the reference numerals
To further clarify the structure and connection between the various components of the present invention, the following reference numerals are given and described.
1. A rectification module; 2. an inductor; 3. a capacitor; 4. an inverter circuit; 5. a voltage detection module; 6. a motor; 7. a voltage transformer; 82. a second current sensor; 83. a third current sensor; 9. an alternating current power supply; 11. a reference waveform calculation module; 12. a motor control module; 13. a current control module; 14. a PWM modulation module; 15. a position sensor.
The technical scheme of the invention can be more clearly understood and explained by combining the embodiment of the invention through the reference sign description.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, these information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present invention. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
The present invention will be described in detail below by way of examples.
A power conversion circuit is shown in fig. 1 and comprises a rectifying module 1, an inductor 2, a capacitor 3 and an inverter circuit 4, wherein the inductor 2 is connected with an alternating current power supply 9 in series, the capacitor 3 is connected with the rectifying module 1 in parallel, the inverter circuit 4 is connected on the capacitor 3 in parallel, the inverter circuit 4 is connected with a motor 6, three-phase alternating current output by the inverter circuit 4 is used for driving the motor 6 to operate, and a voltage transformer 7 is arranged on the alternating current power supply 9 and used for detecting alternating current voltage u on the alternating current power supply 9ac. The voltage detection module 5 is arranged on the capacitor 3 in parallel and used for detecting the bus voltage u on the capacitor 3dc. The second current sensor 82 and the third current sensor 83 are respectively provided on the electric wires of two-phase electricity among three-phase alternating currents output from the inverter circuit 4, and detect the first phase current i on the electric wiresuAnd a second phase current iv. A position sensor 15 is arranged on the motor 6 and used for detecting a motor rotor position angle theta; the reference waveform calculating module 11 is used for calculating a bus voltage u according to the bus voltagedcObtaining a bus voltage reference waveform i through calculationq_waveform_Ref_dc(ii) a The motor control module 12 is based on an alternating voltage uacFirst phase current iuSecond phase current ivMotor rotor position angle theta and motor speed reference value omegar_ref(reference value of motor speed ω)r_refMay be pre-stored in the motor control module 12 or provided to the motor control module 12 by other devices in real time as required), and the q-axis torque current reference value I is obtained by calculationqRef and d-axis current reference value Id-Ref; the current control module 13 refers to the q-axis torque current according to the q-axis torque currentqReference value of current of _Refand d axisdRef, motor rotor position angle theta and first phase current iuAnd a second phase current ivThe q-axis voltage u is obtained by calculationqAnd d-axis voltage udThe PWM module 14 receives the bus voltage u obtained by the voltage detection module 5dcAnd according to the q-axis voltage uqD-axis voltage udMotor rotor position angle theta and first phase current iuAnd a second phase current ivThe control of (3) outputs a PWM waveform with a desired duty ratio, and controls the inverter circuit 4 to output a three-phase alternating current meeting the requirement to be used by the motor 6, so that the motor 6 operates according to corresponding power.
Defining the load formed by the inverter and the motor as a circuit load, and when the circuit load is a pure resistive load, and the corresponding resistance value is R, the bus voltage applied to the circuit load is udcThe theoretical absorbed power P of the circuit load1Comprises the following steps:
according to the FOC control technique, the actual absorbed power P of the circuit load2Calculated from the following formula:
P2＝kTiqωr，
wherein: k is a radical ofTIs a torque constant, iqIs q-axis torque current, omegarThe current rotation speed of the motor.
Order to
k can be any number greater than zero, then:
it can be known that the circuit load is equivalent to a resistance value R of
Is purely resistive.
The aboveTheoretical analysis shows that when the q axis torque current iqNumerical value of and
when the values of (a) and (b) are in direct proportional correlation, the circuit load appears to be purely resistive.
In an ideal situation, when a circuit load of the power conversion circuit is a pure resistive load, a phase difference between an input current and an input voltage of the power conversion circuit is 0, that is, there is no phase difference between the input current and the input voltage, and an input power factor of the power conversion circuit is a maximum value of 1.
Therefore, the bus voltage reference waveform calculation module can calculate the bus voltage reference waveform according to a formula
Determining a bus voltage reference waveform iq_waveform_Ref_dcAnd K is any number larger than zero, and the circuit load is characterized by pure resistive load.
A method of controlling a power conversion circuit, the method comprising:
s101: the reference waveform calculation module receives the bus voltage u detected by the voltage detection moduledc。
S102: the reference waveform calculating module calculates the reference waveform according to a formula
Determining a bus voltage reference waveform iq_waveform_Ref_dc。
S103: the motor control module is based on the AC voltage uacFirst phase current iuSecond phase current ivReference value omega of motor speedr_refThe position angle theta of the motor rotor is calculated to obtain a d-axis current reference value IdRef and q-axis torque current peak value reference value iq_Ref_peak。
S104: the motor control module is according to formula Iq_Ref_g＝iq_Ref_peak*iq_waveform_Ref_dcDetermining a q-axis improved torque current reference Iq_Ref_g。
The significance of this step is to make the q axisImproving the torque current reference IqRef g satisfies the bus voltage reference waveform i in waveformq_waveform_Ref_dcIn amplitude to meet the torque current peak reference value iq_Ref_peakThe requirements of (1).
S105: the current control module improves a torque current reference value I according to the q axisqRef g and d-axis current reference IdRef, calculating to obtain a q-axis improved voltage uq_gAnd d-axis voltage ud。
S106: PWM modulation module improves voltage u according to q axisq_gAnd d-axis voltage udAnd outputting a PWM waveform meeting the requirement so that the circuit load is presented as a pure resistive load.
From the foregoing analysis, it can be seen that the q-axis torque current iqIs arranged according to the bus voltage udcThe square law of the inverter circuit and the motor is changed, so that a circuit load consisting of the inverter circuit and the motor can work in a pure resistance mode, namely, the power factor of the power conversion circuit is improved, and the power factor is close to 1.
In an embodiment of the present invention, step S103 specifically includes:
determining a d-axis current reference value I according to the formula set (4)dRef and q-axis torque current peak value reference value iq_Ref_peak：
In one embodiment of the present invention, step S105 includes: the current control module determines and calculates a q-axis improvement voltage u according to a formula set (5)q_gAnd d-axis voltage ud：
In one embodiment of the present invention, step S106 includes:
step S1061: the PWM modulation module determines the duty ratio p of each IGBT switch in the inverter circuit according to a formula group (6)u_g、pv_gAnd pw_g：
S1062: three upper bridge IGBTs of the inverter circuit are respectively in accordance with pu_g、pv_gAnd pw_gThe switching states of the lower bridge IGBT and the upper bridge IGBT are opposite.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (5)
1. The utility model provides a power conversion circuit, power conversion circuit includes rectifier module (1), inductor (2), condenser (3) and inverter circuit (4), inverter circuit (4) are connected with motor (6), and motor control module (12), current control module (13) and PWM modulation module are connected (14) in proper order, its characterized in that, voltage detection module (5) parallelly connected the setting on condenser (3), voltage detection module (5) are connected with reference waveform calculation module (11), reference waveform calculation module (11) are connected with motor control module (12), reference waveform calculation module (11) are according to the bus voltage u that voltage detection module (5) detecteddcDetermining a bus voltage reference waveform iq_waveform_Ref_dcSaid motor control module (12) being responsive to said bus voltage reference waveform iq_waveform_Ref_dcDetermining a q-axis improved torque current reference IqRef _ g; the power conversion circuit adopts the following control method:
according to bus voltage udcBy the formula
Determining a reference waveform iq_waveform_Ref_dcAccording to said reference waveform iq_waveform_Ref_dcDetermining a q-axis improved torque current reference IqRef _ g, q-axis improved torque current reference IqRef g and d-axis current reference IdRef for controlling the electric machineA power change; the method further comprises the following steps:
step 1: the reference waveform calculation module receives the bus voltage u detected by the voltage detection moduledc；
Step 2: the reference waveform calculating module calculates the reference waveform according to a formula
Determining a bus voltage reference waveform iq_waveform_Ref_dc；
And step 3: the motor control module is based on the AC voltage uacFirst phase current iuSecond phase current ivReference value omega of motor speedr_refThe position angle theta of the motor rotor is calculated to obtain a d-axis current reference value IdRef and q-axis torque current peak value reference value iq_Ref_peak；
And 4, step 4: the motor control module is according to formula Iq_Ref_g＝iq_Ref_peak*iq_waveform_Ref_dcDetermining a q-axis improved torque current reference Iq_Ref_g；
And 5: the current control module improves a torque current reference value I according to the q axisqRef g and d-axis current reference IdRef, the power variation of the motor is controlled.
2. The power conversion circuit of claim 1, wherein the step 3 comprises:
according to formula sets
Determining a d-axis current reference value IdRef and q-axis torque current peak value reference value iq_Ref_peak。
3. The power conversion circuit of claim 1, wherein the step 5 comprises:
step 51: the current control module improves a torque current reference value I according to the q axisqRef _ g andd-axis current reference value IdRef, calculating to obtain a q-axis improved voltage uq_gAnd d-axis voltage ud；
Step 52: PWM modulation module improves voltage u according to q axisq_gAnd d-axis voltage udAnd outputting a PWM waveform meeting the requirement so that the circuit load is presented as a pure resistive load.
4. The power conversion circuit of claim 3, wherein the step 51 comprises:
the current control module is according to formula group
Determining q-axis improvement voltage uq_gAnd d-axis voltage ud。
5. The power conversion circuit of claim 3, wherein the step 52 comprises:
step 521: PWM modulation module according to formula group
Determining the duty cycle p of each IGBT switch in an inverter circuitu_g、pv_gAnd pw_g；
Step 522: three upper bridge IGBTs of the inverter circuit are respectively in accordance with pu_g、pv_gAnd pw_gThe switching states of the lower bridge IGBT and the upper bridge IGBT are opposite.
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