CN107659236A - A kind of power conversion control method and device - Google Patents
A kind of power conversion control method and device Download PDFInfo
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- CN107659236A CN107659236A CN201711003261.9A CN201711003261A CN107659236A CN 107659236 A CN107659236 A CN 107659236A CN 201711003261 A CN201711003261 A CN 201711003261A CN 107659236 A CN107659236 A CN 107659236A
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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
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/22—Current control, e.g. using a current control loop
-
- 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
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- 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
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/24—Vector control not involving the use of rotor position or rotor speed sensors
- H02P21/26—Rotor flux based control
-
- 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
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
- H02P25/022—Synchronous motors
- H02P25/024—Synchronous motors controlled by supply frequency
-
- 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
-
- 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
- H02P2205/00—Indexing scheme relating to controlling arrangements characterised by the control loops
- H02P2205/01—Current loop, i.e. comparison of the motor current with a current reference
-
- 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
- H02P2207/00—Indexing scheme relating to controlling arrangements characterised by the type of motor
- H02P2207/05—Synchronous machines, e.g. with permanent magnets or DC excitation
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The embodiment of the present invention proposes a kind of power conversion control method and device, is related to variable-frequency driving technique field.This method and device are first depending on the input current received, input voltage, busbar voltage, bus current and input to the parameters such as the phase current of motor determine inductive drop reference value, q shaft voltages specified rate and d shaft voltage specified rates, generate the first pulse-width signal according to inductive drop reference value and q shaft voltages specified rate and d shaft voltages specified rate respectively again, second pulse-width signal, the electric current of dc-link capacitance front end is wherein adjusted by the first pulse-width signal, pass through the voltage of the second pulse-width signal regulation motor, so that the power-balance of dc-link capacitance rear and front end, reduce dc-link capacitance ripple current；Simultaneously because the power of dc-link capacitance rear and front end is of substantially equal, therefore dc-link capacitance only needs to store less power, so as to be substituted using the less thin-film capacitor of capacity.
Description
Technical field
The present invention relates to variable-frequency driving technique field, in particular to a kind of power conversion control method and device.
Background technology
China's motor recoverable amount is big, and consumption electric energy is big, but mostly less efficient.Permagnetic synchronous motor has body due to it
The features such as product is small, efficiency high, power factor are high, staring torque is big, heating is low, application is relatively broad.
Existing permanent magnet synchronous electric drive circuit, DC voltage is stabilized to be provided to permagnetic synchronous motor, power because
Number correction (Power Factor Correction, PFC) rear ends have been normally set up big electrochemical capacitor, but due to electrochemical capacitor before
End input power fluctuates with alternating voltage phase, and the motor of rear end is constant power load, thus electrochemical capacitor has charge and discharge
Electric process, and larger ripple current can be formed in the process, cause DC bus-bar voltage to fluctuate.
The content of the invention
In view of this, it is an object of the invention to provide a kind of power conversion control method and device, to solve above-mentioned ask
Topic.
To achieve these goals, the technical scheme that the embodiment of the present invention uses is as follows：
In a first aspect, the embodiments of the invention provide a kind of power conversion control method, the power conversion control method
Including：
Input current, input voltage, busbar voltage, bus current and input are received to the phase current of motor；
According to the busbar voltage, the bus current, the input voltage, the input current and presetting mother
Line voltage reference value determines inductive drop reference value；
According to the phase current, the input voltage, presetting motor speed reference value and presetting d shaft currents
Reference value determines q shaft voltages specified rate and d shaft voltage specified rates；
The first pulse-width signal is generated according to the inductive drop reference value；
The second pulse-width signal is generated according to the q shaft voltages specified rate and the d shaft voltages specified rate.
Further, it is described according to the busbar voltage, the bus current, the input voltage, the input current
And presetting busbar voltage reference value the step of determining inductive drop reference value, includes：
Determine to actually enter electric current according to the busbar voltage, the bus current and the input voltage；
Input current correction value is determined according to the presetting busbar voltage reference value and the busbar voltage；
Electric current, the input current correction value and the input current are actually entered according to described in and determines the inductance electricity
Press reference value.
Further, electric current, the input current correction value and the input current are actually entered described in the foundation
The step of determining the inductive drop reference value includes：
Electric current, the input current correction value calculating current reference value are actually entered according to described in；
The inductive drop reference value is determined according to the current reference value and the input current.
Further, it is described according to the phase current, the input voltage, presetting motor speed reference value and pre-
The d shaft current reference values of setting determine that the step of q shaft voltages specified rate and d shaft voltage specified rates includes：
Motor speed actual value, d shaft currents and q shaft currents are calculated according to the phase current；
Q shaft currents are determined according to the rotary speed actual value, presetting motor speed reference value and the input voltage
Reference value；
The q shaft voltages specified rate is calculated according to the q shaft currents and the q shaft currents reference value；
The d shaft voltages specified rate is calculated according to the d shaft currents and the presetting d shaft currents reference value.
Further, the motor speed reference value according to the rotary speed actual value, presetting and the input electricity
Pressure determines that the step of q shaft current reference values includes：
Torque current is determined according to the rotary speed actual value, presetting motor speed reference value；
Determine that torque current changes waveform according to input voltage；
The q shaft currents reference value is determined according to the torque current and torque current change waveform.
Second aspect, the embodiment of the present invention additionally provide a kind of power conversion control device, the power conversion control dress
Put including：
Circuit parameter receiving unit, for receiving input current, input voltage, busbar voltage, bus current and input
To the phase current of motor；
Inductive drop reference value determining unit, for according to the busbar voltage, the bus current, the input electricity
Pressure, the input current and presetting busbar voltage reference value determine inductive drop reference value；
Voltage specified rate determining unit, for according to the phase current, the input voltage, presetting motor speed ginseng
Examine value and presetting d shaft current reference values determine q shaft voltages specified rate and d shaft voltage specified rates；
First pulse-width signal generation unit, for generating the first pulsewidth modulation letter according to the inductive drop reference value
Number；
Second pulse-width signal generation unit, for according to the q shaft voltages specified rate and the d shaft voltages specified rate
Generate the second pulse-width signal.
Further, the inductive drop reference value determining unit is used for according to the busbar voltage, the bus current
And the input voltage determines to actually enter electric current；
The inductive drop reference value determining unit is additionally operable to according to the presetting busbar voltage reference value and institute
State busbar voltage and determine input current correction value；
The inductive drop reference value determining unit is additionally operable to actually enter electric current, the input current amendment according to described in
Value and the input current determine the inductive drop reference value.
Further, the inductive drop reference value determining unit is additionally operable to actually enter electric current, described defeated according to described in
Enter electric current correction value calculating current reference value；
The inductive drop reference value determining unit is additionally operable to true according to the current reference value and the input current
The fixed inductive drop reference value.
Further, the voltage specified rate determining unit is used to calculate motor speed actual value, d according to the phase current
Shaft current and q shaft currents；
The voltage specified rate determining unit is additionally operable to according to the rotary speed actual value, presetting motor speed reference value
And the input voltage determines q shaft current reference values；
The voltage specified rate determining unit is additionally operable to calculate institute according to the q shaft currents and the q shaft currents reference value
State q shaft voltage specified rates；
The voltage specified rate determining unit is additionally operable to according to the d shaft currents and the presetting d shaft currents reference
Value calculates the d shaft voltages specified rate.
Further, the voltage specified rate determining unit is additionally operable to according to the rotary speed actual value, presetting motor
Speed reference determines torque current；
The voltage specified rate determining unit is additionally operable to determine that torque current changes waveform according to input voltage；
The voltage specified rate determining unit is additionally operable to according to the torque current and torque current change waveform
Determine the q shaft currents reference value.
Power conversion control method and device provided in an embodiment of the present invention, it is electric according to the busbar voltage, bus received
Stream, input voltage, input current and presetting busbar voltage reference value determine inductive drop reference value, then according to mutually electricity
Stream, input voltage, presetting motor speed reference value and presetting d shaft current reference values determine q shaft voltage specified rates
And d shaft voltage specified rates, then respectively according to inductive drop reference value and the generation of q shaft voltages specified rate and d shaft voltages specified rate
First pulse-width signal, the second pulse-width signal, wherein before adjusting dc-link capacitance by the first pulse-width signal
The electric current at end, by the voltage of the second pulse-width signal regulation motor, so that the work(of dc-link capacitance rear and front end
Rate balances, and reduces dc-link capacitance ripple current；Simultaneously because the power of dc-link capacitance rear and front end is of substantially equal, because
This dc-link capacitance only needs to store less power, so as to be substituted using the less thin-film capacitor of capacity.
To enable the above objects, features and advantages of the present invention to become apparent, preferred embodiment cited below particularly, and coordinate
Appended accompanying drawing, is described in detail below.
Brief description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below by embodiment it is required use it is attached
Figure is briefly described, it will be appreciated that the following drawings illustrate only certain embodiments of the present invention, therefore be not construed as pair
The restriction of scope, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to this
A little accompanying drawings obtain other related accompanying drawings.
Fig. 1 shows the circuit structure block diagram of power conversion control system provided in an embodiment of the present invention.
Fig. 2 shows the circuit diagram of power conversion control system provided in an embodiment of the present invention.
Fig. 3 shows the flow chart of power conversion control method provided in an embodiment of the present invention.
Fig. 4 shows the particular flow sheet of step S302 in Fig. 3.
Fig. 5 shows the particular flow sheet of step S303 in Fig. 3.
Fig. 6 shows the particular flow sheet of step S305 in Fig. 3.
Fig. 7 shows the functional block diagram of power conversion control device provided in an embodiment of the present invention.
Icon：100- power conversion control systems；110- circuit parameter acquisition modules；120- drive modules；130- motors；
The pulse width modulation modules of 140- first；The control modules of 150- first；The pulse width modulation modules of 160- second；The control modules of 170- second；
200- power conversion control devices；210- circuit parameter receiving units；220- inductive drop reference value determining units；230- voltages
Specified rate determining unit；240- the first pulse-width signal generation units；250- the second pulse-width signal generation units.
Embodiment
Below in conjunction with accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Ground describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.Generally exist
The component of the embodiment of the present invention described and illustrated in accompanying drawing can be configured to arrange and design with a variety of herein.Cause
This, the detailed description of the embodiments of the invention to providing in the accompanying drawings is not intended to limit claimed invention below
Scope, but it is merely representative of the selected embodiment of the present invention.Based on embodiments of the invention, those skilled in the art are not doing
The every other embodiment obtained on the premise of going out creative work, belongs to the scope of protection of the invention.
It should be noted that：Similar label and letter represents similar terms in following accompanying drawing, therefore, once a certain Xiang Yi
It is defined, then it further need not be defined and explained in subsequent accompanying drawing in individual accompanying drawing.Meanwhile the present invention's
In description, term " first ", " second " etc. are only used for distinguishing description, and it is not intended that instruction or hint relative importance.
Referring to Fig. 1, show the circuit structure block diagram of power conversion control system 100 provided in an embodiment of the present invention.
The power conversion control system 100 include circuit parameter acquisition module 110, drive module 120, the first pulse width modulation module 140,
Second pulse width modulation module 160, the first control module 150, the second control module 170 and motor 130.Drive module 120 with
Motor 130, circuit parameter acquisition module 110, the first pulse width modulation module 140, the second pulse width modulation module 160 electrically connect.
First pulse width modulation module 140 electrically connects with the first control module 150, the second pulse width modulation module 160 and the second control module
170 electrical connections.
Wherein, circuit parameter acquisition module 110 be used for gather input current, input voltage, busbar voltage, bus current with
And input to the phase current of motor 130, and busbar voltage, bus current, input voltage and input current are transmitted to first
Control module 150, phase current, input voltage are transmitted to the second control module 170.
Referring to Fig. 2, the circuit diagram of power conversion control system 100 provided in an embodiment of the present invention.Power conversion controls
System 100 includes power circuit, rectification circuit, booster circuit, dc-link capacitance and inverter circuit.Wherein, power circuit,
Rectification circuit, booster circuit, dc-link capacitance and inverter circuit are sequentially connected electrically, booster circuit and the first control module
150 electrical connections, inverter circuit electrically connect with the second control module 170.
Wherein, power circuit provides alternating current for circuit；It is direct current that rectification circuit, which is used for convert alternating current,；Boosting electricity
Road is used for the magnitude of voltage for adjusting dc-link capacitance；Dc-link capacitance is used to filter what is still had after rectified circuit rectifies
Alternating current；Inverter circuit electrically connects with control module, under the control of pulse-width signal, output voltage to motor 130,
Realize the control to motor 130.
First control module 150 is used to determine that inductive drop refers to according to phase current and presetting motor speed reference value
Value, and produce the first pulse-width signal according to the inductive drop reference value.
First pulse width modulation module 140 be used to responding the first pulse-width signal and by controlling the break-make shape of booster circuit
State regulation is inputted to the electric current of dc-link capacitance.
Second control module 170 is used for according to input current, input voltage, phase current, busbar voltage, presetting motor
Speed reference and presetting busbar voltage reference value determine q shaft voltages specified rate and d shaft voltage specified rates, and according to q axles
Voltage specified rate and d shaft voltages specified rate generate the second pulse-width signal.
Second pwm unit be used to responding the second pulse-width signal and by adjusting the conducting state of inversion module
Realize the control to the three-phase voltage of motor 130.
First embodiment
The embodiments of the invention provide a kind of power conversion control method, applied to power conversion control system 100.The work(
Rate conversion control method is used for while dc-link capacitance ripple is reduced, and realizes the driving to motor 130.Referring to Fig. 3,
For the flow chart of power conversion control method provided in an embodiment of the present invention.The power conversion control method includes：
Step S301：Input current, input voltage, busbar voltage, bus current and input are received to the phase of motor 130
Electric current.
It is to be appreciated that the phase electricity of input current, input voltage, busbar voltage, bus current and input to motor 130
Stream is that circuit parameter acquisition module 110 is gathered and transmitted；In addition, in the present embodiment, input to the phase current of motor 130
Including u phase currents iuAnd v phase currents iv。
Step S302：According to busbar voltage, bus current, input voltage, input current and presetting busbar voltage
Reference value determines inductive drop reference value.
Referring to Fig. 4, the particular flow sheet for step S302.Step S302 includes：
Sub-step S3021：Determine to actually enter electric current according to busbar voltage, bus current and input voltage.
Specifically, sub-step S3021 is calculated actually entering electric current by using following calculation formula：
Wherein, iac_Ref_0To actually enter electric current, UdcFor busbar voltage, IdcFor bus current, UacFor input voltage.
It is to be appreciated that the meaning of above-mentioned calculation formula is：According to the consumption power of dc-link capacitance rear class and
Input voltage calculates and actually enters electric current, so as to which input power make it that the power that dc-link capacitance rear class consumes is equal.
Sub-step S3022：Input current correction value is determined according to presetting busbar voltage reference value and busbar voltage.
Specifically, sub-step S3021 is calculated input current correction value by using following calculation formula：
Δiac_Ref=Kp1 *(Udc_Ref-Udc)+Ki1*∫(Udc_Ref-Udc)dt
Wherein, Δ iac_RefFor input current correction value, Udc_RefFor presetting busbar voltage reference value, Kp1It is default
The first fixed proportionality coefficient, Ki1For presetting first integral coefficient.
It is to be appreciated that by calculating input current correction value, busbar voltage and busbar voltage reference value phase can be caused
Deng to reduce error.In addition, the calculation formula can be realized by using suitable debugger, such as in the present embodiment, use
Be pi regulator.
Sub-step S3023：Determine that inductive drop is joined according to electric current, input current correction value and input current is actually entered
Examine value.
Specifically, it is first depending on actually entering electric current, input current correction value calculating current reference value, its calculation formula is such as
Shown in lower：
iac_Ref=Δ iac_Ref+iac_Ref_0
Wherein, iac_RefFor current reference value.
Then, the inductive drop reference value is determined according to current reference value and input current, its calculation formula is as follows
It is shown：
uout=Kp2*(iac_Ref-iac)+Ki2 *∫(iac_Ref-iac)dt
Wherein, uoutFor inductive drop reference value, iacFor input current, Kp2For the second presetting proportionality coefficient, Ki2For
Presetting second integral coefficient.
It is to be appreciated that inductive drop reference value is the magnitude of voltage of DC bus-bar voltage front end, due to calculating inductance electricity
The consumption power of real-time reference DC bus-bar voltage rear class during pressure reference value, thus when input to DC bus-bar voltage front end
Magnitude of voltage be by above-mentioned steps calculate inductive drop value when, the power of DC bus-bar voltage front stage is equal.
Step S303：According to phase current, input voltage, presetting motor speed reference value and presetting d axles electricity
Stream reference value determines q shaft voltages specified rate and d shaft voltage specified rates.
Referring to Fig. 5, the particular flow sheet for step S303.Then step S303 includes：
Sub-step S3031：Motor speed actual value, d shaft currents and q shaft currents are calculated according to phase current.
Pass through u phase currents i firstuAnd v phase currents ivCalculate w phase currents iw：
iw=-iu-iv
Then u phase currents i is passed throughu, v phase currents ivAnd w phase currents iwCalculate α shaft currents and β shaft currents, formula are as follows
It is shown：
iα=iu
Then the calculation formula of q shaft currents is：
iq=iβcosθ-iαsinθ
The calculation formula of d shaft currents is：
id=iαcosθ+iβsinθ
Wherein, θ is the angle of the rotor permanent magnet magnetic linkage of motor 130, can be drawn by traditional position estimation algorithm, and it is counted
Calculation process is as follows：
It is first depending on d axis components and q axis components that following formula calculate counter electromotive force：
Wherein, estimated angle and the error of actual angle
Then the angle of the rotor permanent magnet magnetic linkage of motor 130 is calculated by following formula：
θ (n)=θ (n-1)+Δ θ
Then motor speed actual value can be calculated by following formula：
Sub-step S3022：Q axles are determined according to rotary speed actual value, presetting motor speed reference value and input voltage
Current reference value.
First, torque current is determined according to rotary speed actual value, presetting motor speed reference value, its calculation formula is as follows
It is shown：
IT_Ref=Kp3*(Wr_Ref-Wr)+Ki3*∫(Wr_Ref-Wr)dt
Wherein, IT_RefFor torque current, Wr_RefFor presetting motor speed reference value, WrFor motor speed actual value,
Kp3For the 3rd presetting proportionality coefficient, Ki3For presetting third integral coefficient.
Then, determine that torque current changes waveform according to input voltage, its calculation formula is as follows：
Wherein, K is normalization coefficient, IT_WaveformChange waveform for torque current.
Finally, q shaft current reference values are determined according to torque current and torque current change waveform, its calculation formula is as follows
It is shown：
Iq_Ref=IT_Ref*IT_Waveform
Wherein, Iq_RefFor q shaft current reference values.
Sub-step S3033：The q shaft voltages specified rate is calculated according to q shaft currents and q shaft currents reference value.
Specifically, q shaft voltage specified rates are calculated by following formula：
uq=Kp4*(Iq_Ref-Iq)+Ki4*∫(Iq_Ref-Iq)dt
Wherein, uqFor q shaft voltage specified rates, Kp4For the 4th presetting proportionality coefficient, Ki4For the 4th presetting integration
Coefficient.
Sub-step S3034：D shaft voltage specified rates are calculated according to d shaft currents and presetting d shaft currents reference value.
Specifically, d shaft voltage specified rates are calculated by following formula：
ud=Kp5*(Id_Ref-Id)+Ki5*∫(Id_Ref-Id)dt
Wherein, udFor d shaft voltage specified rates, Id_RefFor presetting d shaft current reference values, Kp5For the 5th presetting ratio
Example coefficient, Ki5For the 5th presetting integral coefficient.
In a kind of preferred embodiment, presetting d shaft currents reference value is 0；When needing the weak magnetic to control simultaneously, preset
Fixed d shaft current reference values should be negative value, and size should suitably increase.
Step S304：The first pulse-width signal is generated according to inductive drop reference value.
Specifically, when inductive drop reference value is more than the first presetting triangle wave amplitude, the first pulse-width signal
For 1；When inductive drop reference value is less than or equal to the first presetting triangle wave amplitude, the first pulse-width signal is 0.
Step S305：The second pulse-width signal is generated according to q shaft voltages specified rate and d shaft voltages specified rate.
It please join figure and read Fig. 6, be step S305 sub-step flow chart.Step S305 includes：
Sub-step S3051：Three-phase output pulse width is calculated based on q shaft voltages specified rate and d shaft voltages specified rate.
uα=udcosθ-uqsinθ
uβ=udsinθ+uqcosθ
uu=uα
Wherein, uu、uv、uwThe respectively three-phase output pulse width of motor 130.
Sub-step S3052：Calculate the target voltage values of U, V, W three-phase respectively based on three-phase output pulse width and busbar voltage.
Specifically, the target voltage values of U, V, W three-phase are calculated by following formula respectively：
Wherein, UU-N、UV-N、UU-NThe respectively target voltage values of U, V, W three-phase.
Sub-step S3053：Target voltage values and the second presetting triangle wave amplitude based on U, V, W three-phase calculate respectively
U, the fiducial value of V, W three-phase.
Specifically, the fiducial value of U, V, W three-phase is calculated by following formula：
CompU=A*uU-N/udc
CompV=A*uV-N/udc
CompW=A*uW-N/udc
Wherein, CompU, CompV, CompW are respectively the fiducial value of U, V, W three-phase, and A is the second presetting triangle wave amplitude
Value.
Sub-step S3054：Judge whether the fiducial value of U, V, W three-phase is more than the second triangle wave amplitude respectively, if it is,
Perform sub-step S3055；If it is not, then perform sub-step S3056.
Judge whether CompU, CompV, CompW meet
Sub-step S3055：Determine that the value that the second pulse-width signal corresponds to phase is 1.
Meet CompU for example, working as>During A, PWM_U=1；When meeting CompV>During A, PWM_V=1；When meeting CompW>A
When, PWM_W=1.
Wherein, PWM_U, PWM_V and PWM_W are respectively the output of pulse-width signal U, V, W three-phase.
Sub-step S3056：Determine that the value that the second pulse-width signal corresponds to phase is 0.
For example, when meeting CompU≤A, PWM_U=0；When meeting CompV≤A, PWM_V=0；When meeting CompW
During≤A, PWM_W=0.
Second embodiment
A kind of referring to Fig. 7, power conversion control device 200 provided for present pre-ferred embodiments.Need what is illustrated
It is the power conversion control device 200 that the present embodiment is provided, its general principle and caused technique effect and above-described embodiment
Identical, to briefly describe, the present embodiment part does not refer to part, refers to corresponding contents in the above embodiments.Power conversion
Control device 200 includes circuit parameter receiving unit 210, inductive drop reference value determining unit 220, voltage specified rate and determines list
First 230, first pulse-width signal generation unit 240 and the second pulse-width signal generation unit 250.
Wherein, circuit parameter receiving unit 210 be used for gather input current, input voltage, busbar voltage, bus current with
And input to the phase current of motor 130.
It is to be appreciated that circuit parameter receiving unit 210 can be used for performing step S301.
Inductive drop reference value determining unit 220 is used for according to the busbar voltage, the bus current, the input electricity
Pressure, the input current and presetting busbar voltage reference value determine inductive drop reference value.
Specifically, inductive drop reference value determining unit 220 is additionally operable to according to busbar voltage, bus current and input electricity
Pressure determination actually enters electric current；According to presetting busbar voltage reference value and busbar voltage determine input current correction value with
And determine inductive drop reference value according to electric current, input current correction value and input current is actually entered.
It is to be appreciated that inductive drop reference value determining unit 220 can be used for performing step S302.
Voltage specified rate determining unit 230 is used for according to the phase current, the input voltage, presetting motor speed
Reference value and presetting d shaft current reference values determine q shaft voltages specified rate and d shaft voltage specified rates.
Specifically, voltage specified rate determining unit 230 is used to calculate motor speed actual value, d shaft currents according to phase current
And q shaft currents；Determine that q shaft currents refer to according to rotary speed actual value, presetting motor speed reference value and input voltage
Value；The q shaft voltages specified rate is calculated according to the q shaft currents and q shaft currents reference value；According to d shaft currents and presetting d
Shaft current reference value calculates d shaft voltage specified rates.
It is to be appreciated that voltage specified rate determining unit 230 can be used for performing step S303.
First pulse-width signal generation unit 240 is used to generate the first pulsewidth modulation according to the inductive drop reference value
Signal.
It is to be appreciated that the first pulse-width signal generation unit 240 can be used for performing step S304.
Second pulse-width signal generation unit 250 is used to give according to the q shaft voltages specified rate and the d shaft voltages
Amount the second pulse-width signal of generation.
It is to be appreciated that the second pulse-width signal generation unit 250 can be used for performing step S305.
In summary, power conversion control method and device provided in an embodiment of the present invention, according to the bus electricity received
Pressure, bus current, input voltage, input current and presetting busbar voltage reference value determine inductive drop reference value, then
Q axles electricity is determined according to phase current, input voltage, presetting motor speed reference value and presetting d shaft current reference values
Specified rate and d shaft voltage specified rates are pressed, then is given respectively according to inductive drop reference value and q shaft voltages specified rate and d shaft voltages
The first pulse-width signal, the second pulse-width signal are quantitatively generated, wherein it is female to adjust direct current by the first pulse-width signal
The electric current of line capacitance front end, by the voltage of the second pulse-width signal regulation motor, so that before and after dc-link capacitance
The power-balance at both ends, reduce dc-link capacitance ripple current；Simultaneously because the power base of dc-link capacitance rear and front end
This is equal, therefore dc-link capacitance only needs to store less power, so as to be replaced using the less thin-film capacitor of capacity
Generation.
It should be noted that herein, such as first and second or the like relational terms are used merely to a reality
Body or operation make a distinction with another entity or operation, and not necessarily require or imply and deposited between these entities or operation
In any this actual relation or order.Moreover, term " comprising ", "comprising" or its any other variant are intended to
Nonexcludability includes, so that process, method, article or equipment including a series of elements not only will including those
Element, but also the other element including being not expressly set out, or it is this process, method, article or equipment also to include
Intrinsic key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that
Other identical element also be present in process, method, article or equipment including the key element.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.It should be noted that：Similar label and letter exists
Similar terms is represented in following accompanying drawing, therefore, once being defined in a certain Xiang Yi accompanying drawing, is then not required in subsequent accompanying drawing
It is further defined and explained.
Claims (10)
1. a kind of power conversion control method, it is characterised in that the power conversion control method includes：
Input current, input voltage, busbar voltage, bus current and input are received to the phase current of motor；
According to the busbar voltage, the bus current, the input voltage, the input current and presetting bus electricity
Pressure reference value determines inductive drop reference value
Referred to according to the phase current, the input voltage, presetting motor speed reference value and presetting d shaft currents
Value determines q shaft voltages specified rate and d shaft voltage specified rates；
The first pulse-width signal is generated according to the inductive drop reference value；
The second pulse-width signal is generated according to the q shaft voltages specified rate and the d shaft voltages specified rate.
2. power conversion control method according to claim 1, it is characterised in that described according to the busbar voltage, institute
State bus current, the input voltage, the input current and presetting busbar voltage reference value and determine that inductive drop is joined
The step of examining value includes：
Determine to actually enter electric current according to the busbar voltage, the bus current and the input voltage；
Input current correction value is determined according to the presetting busbar voltage reference value and the busbar voltage；
Electric current, the input current correction value and the input current are actually entered according to described in and determines the inductive drop ginseng
Examine value.
3. power conversion control method according to claim 2, it is characterised in that actually enter electricity described in the foundation
The step of stream, the input current correction value and the input current determine the inductive drop reference value includes：
Electric current, the input current correction value calculating current reference value are actually entered according to described in；
The inductive drop reference value is determined according to the current reference value and the input current.
4. power conversion control method according to claim 1, it is characterised in that it is described according to the phase current, it is described
Input voltage, presetting motor speed reference value and presetting d shaft current reference values determine q shaft voltages specified rate and d
The step of shaft voltage specified rate, includes：
Motor speed actual value, d shaft currents and q shaft currents are calculated according to the phase current；
Determine that q shaft currents refer to according to the rotary speed actual value, presetting motor speed reference value and the input voltage
Value；
The q shaft voltages specified rate is calculated according to the q shaft currents and the q shaft currents reference value；
The d shaft voltages specified rate is calculated according to the d shaft currents and the presetting d shaft currents reference value.
5. power conversion control method according to claim 4, it is characterised in that it is described according to the rotary speed actual value,
Presetting motor speed reference value and the input voltage determine that the step of q shaft current reference values includes：
Torque current is determined according to the rotary speed actual value, presetting motor speed reference value；
Determine that torque current changes waveform according to input voltage；
The q shaft currents reference value is determined according to the torque current and torque current change waveform.
6. a kind of power conversion control device, it is characterised in that the power conversion control device includes：
Circuit parameter receiving unit, for receiving input current, input voltage, busbar voltage, bus current and input to electricity
The phase current of machine；
Inductive drop reference value determining unit, for according to the busbar voltage, the bus current, the input voltage, institute
State input current and presetting busbar voltage reference value determines inductive drop reference value；
Voltage specified rate determining unit, for according to the phase current, the input voltage, presetting motor speed reference value
And presetting d shaft current reference values determine q shaft voltages specified rate and d shaft voltage specified rates；
First pulse-width signal generation unit, for generating the first pulse-width signal according to the inductive drop reference value；
Second pulse-width signal generation unit, for according to the q shaft voltages specified rate and d shaft voltages specified rate generation
Second pulse-width signal.
7. power conversion control device according to claim 6, it is characterised in that the inductive drop reference value determines single
Member is used to determine to actually enter electric current according to the busbar voltage, the bus current and the input voltage；
The inductive drop reference value determining unit is additionally operable to according to the presetting busbar voltage reference value and the mother
Line voltage determines input current correction value；
The inductive drop reference value determining unit be additionally operable to according to described in actually enter electric current, the input current correction value with
And the input current determines the inductive drop reference value.
8. power conversion control device according to claim 7, it is characterised in that the inductive drop reference value determines single
Member is additionally operable to actually enter electric current, the input current correction value calculating current reference value according to described in；
The inductive drop reference value determining unit is additionally operable to determine institute according to the current reference value and the input current
State inductive drop reference value.
9. power conversion control device according to claim 6, it is characterised in that the voltage specified rate determining unit is used
According to phase current calculating motor speed actual value, d shaft currents and q shaft currents；
The voltage specified rate determining unit be additionally operable to according to the rotary speed actual value, presetting motor speed reference value and
The input voltage determines q shaft current reference values；
The voltage specified rate determining unit is additionally operable to calculate the q axles according to the q shaft currents and the q shaft currents reference value
Voltage specified rate；
The voltage specified rate determining unit is additionally operable to according to the d shaft currents and the presetting d shaft current reference value meters
Calculate the d shaft voltages specified rate.
10. power conversion control device according to claim 9, it is characterised in that the voltage specified rate determining unit
It is additionally operable to determine torque current according to the rotary speed actual value, presetting motor speed reference value；
The voltage specified rate determining unit is additionally operable to determine that torque current changes waveform according to input voltage；
The voltage specified rate determining unit is additionally operable to determine according to the torque current and torque current change waveform
The q shaft currents reference value.
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| CN201711003261.9A CN107659236B (en) | 2017-10-24 | 2017-10-24 | A kind of power conversion control method and device |
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| CN112910333A (en) * | 2021-02-06 | 2021-06-04 | 广东希塔变频技术有限公司 | Control method, device and circuit for motor drive and variable frequency air conditioner |
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| CN107659236B (en) | 2018-11-13 |
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