CN107623474A - 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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- CN107623474A CN107623474A CN201711003419.2A CN201711003419A CN107623474A CN 107623474 A CN107623474 A CN 107623474A CN 201711003419 A CN201711003419 A CN 201711003419A CN 107623474 A CN107623474 A CN 107623474A
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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 according to the input current received, input voltage, phase current and presetting motor speed reference value determine inductive drop reference value, again according to phase current, input current, input voltage and busbar voltage determine 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；Dc-link capacitance only needs to store less power simultaneously, 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 and input are received to the phase current of motor；
Motor speed actual value, d shaft currents and q shaft currents are calculated according to the phase current；
Join according to the input current, the input voltage, the motor speed actual value and presetting motor speed
Examine value and determine inductive drop reference value；
According to the input current, the input voltage, the busbar voltage, the d shaft currents and the q shaft currents
Determine 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.
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 and input to the phase of motor
Electric current；
Computing unit, for calculating motor speed actual value, d shaft currents and q shaft currents according to the phase current；
Inductive drop reference value determining unit, for according to the input current, the input voltage, the motor speed
Actual value and presetting motor speed reference value determine inductive drop reference value；
Voltage specified rate determining unit, for according to the input current, the input voltage, the busbar voltage, institute
State d shaft currents and the q shaft currents 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.
Power conversion control method and device provided in an embodiment of the present invention, according to input current, the input electricity received
Pressure, phase current and presetting motor speed reference value determine inductive drop reference value, then according to phase current, input current,
Input voltage and busbar voltage determine q shaft voltages specified rate and d shaft voltage specified rates, then respectively according to inductive drop reference value
And q shaft voltages specified rate and d shaft voltages specified rate generate the first pulse-width signal, the second pulse-width signal, wherein logical
The electric current of the first pulse-width signal regulation dc-link capacitance front end is crossed, passes through the electricity of the second pulse-width signal regulation motor
Pressure, so that the power-balance of dc-link capacitance rear and front end, reduces dc-link capacitance ripple current；It is simultaneously because straight
It is of substantially equal to flow the electric current of bus capacitor front stage, therefore dc-link capacitance only needs to store less power, so as to
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 S3032 in Fig. 5.
Fig. 7 shows the particular flow sheet of step S305 in Fig. 3.
Fig. 8 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 and input are received to the phase current of motor 130.
It is to be appreciated that input current, input voltage, busbar voltage and input to the phase current of motor 130 are electricity
What road parameter collection module 110 was gathered and transmitted；In addition, in the present embodiment, inputting to the phase current of motor 130 includes u phases
Electric current iuAnd v phase currents iv。
Step S302：Inductance is determined according to input current, input voltage, phase current and presetting motor speed reference value
Voltage reference value.
Referring to Fig. 4, the particular flow sheet for step S302.Step S302 includes：
Sub-step S3021：Motor speed actual value is 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：Determine that torque current is joined according to motor speed actual value and presetting motor speed reference value
Examine value.
Specifically, by doing PI computings to the difference of motor speed actual value and presetting speed reference, it is calculated
Formula is as follows：
IT_Ref=Kp2*(Wr_Ref-Wr)+Ki2*∫(Wr_Ref-Wr)dt
Wherein, IT_RefFor torque current reference, Wr_RefFor motor speed reference value, WrFor motor speed actual value, Kp2
For the second presetting proportionality coefficient, Ki2For presetting second integral coefficient.
Sub-step S3023：Input current reference value is calculated according to torque current reference, input voltage.
Specifically, calculation formula is as described below：
iac_Ref=K*uac*IT_Ref
Wherein, iac_RefFor input current reference value, uacFor input voltage, K is presetting proportionality coefficient.
Sub-step S3024：Inductive drop reference value is determined according to torque current reference and input current reference value.
Specifically, it can determine that inductive drop refers to by doing PI computings to the difference of input current reference value and input current
Value, its calculation formula are as follows：
Uout=Kp3*(iac_Ref-iac)+Ki3*∫(iac_Ref-iac)dt
Wherein, UoutFor inductive drop reference value, iac_RefFor input current reference value, iacFor input current, Kp3It is default
The 3rd fixed proportionality coefficient, Ki3For presetting third integral coefficient.
Step S303：Q shaft voltages specified rate and d axles are determined according to input current, input voltage, busbar voltage, phase current
Voltage specified rate.
Referring to Fig. 5, the particular flow sheet for step S303.Then step S303 includes：
Sub-step S3031：Q shaft currents and d shaft currents are calculated according to phase current.
Based on sub-step S3021 description, can learn
iq=iβcosθ-iαsinθ
id=iαcosθ+iβsinθ
Sub-step S3032：Q shaft current reference values are determined according to input current, input voltage, busbar voltage.
Referring to Fig. 6, the particular flow sheet for sub-step S3032.Then sub-step S3032 includes：
Sub-step S30321：The first DC bus current is calculated according to input current, input voltage and busbar voltage.
Specifically, the first DC bus current can be calculated by following formula：
Wherein, Idc1For the first DC bus current.
It should be noted that the first DC bus current is the electric current of dc-link capacitance prime.
Sub-step S30322：The second dc bus electricity is calculated according to busbar voltage, input voltage, q shaft currents and q shaft currents
Stream.
Specifically, the second DC bus current can be calculated by following formula：
Wherein, PMotorFor power of motor, idc2For the second DC bus current.
It should be noted that the second DC bus current is the electric current of dc-link capacitance rear class.
Sub-step S30323：DC bus current is calculated according to busbar voltage and presetting busbar voltage reference value to mend
The amount of repaying.
Specifically, DC bus current compensation rate can be calculated by following PI regulative modes：
Δidc=Kp4*(Udc_Ref-udc)+Ki4*∫(Udc_Ref-udc)dt
Wherein, udcFor busbar voltage, Udc_RefFor presetting busbar voltage reference value, Δ idcMended for DC bus current
The amount of repaying, Kp4For the 4th presetting proportionality coefficient, Ki4For the 4th presetting integral coefficient.
It is to be appreciated that by carrying out PI regulations to busbar voltage, the DC bus current compensation finally drawn may be such that
Measure Δ idcMeet formula idc2=idc1-Δidc。
Sub-step S30324：Mended according to the first DC bus current, the second DC bus current and DC bus current
The amount of repaying determines q shaft current reference values.
Specifically, q shaft current reference values can be determined by PI regulative modes：
Iq_Ref=Kp1*(idc1-idc+Δidc)+Ki1*∫(idc1-idc+Δidc)dt
Wherein, Iq_RefFor q shaft current reference values, Kp1For the first presetting proportionality coefficient, Ki1For the first presetting product
Divide coefficient.
It is to be appreciated that by according to the first DC bus current, the second DC bus current and DC bus current
Compensation rate, while q shaft current reference values are determined using PI regulative modes, the electric current for flowing into dc-link capacitance is reduced, can be made
It is almost equal to obtain the electric current of dc-link capacitance front stage, so as to which dc-link capacitance need to only store less power, thus can
Substituted using the less thin-film capacitor of capacity.
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=Kp5*(Iq_Ref-Iq)+Ki5*∫(Iq_Ref-Iq)dt
Wherein, uqFor q shaft voltage specified rates, Kp5For the 5th presetting proportionality coefficient, Ki5For the 5th 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=Kp6*(Id_Ref-Id)+Ki6*∫(Id_Ref-Id)dt
Wherein, udFor d shaft voltage specified rates, Id_RefFor presetting d shaft current reference values, Kp6For the 6th presetting ratio
Example coefficient, Ki6For the 6th 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. 7, 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. 8, 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 is used to gather input current, input voltage, busbar voltage and input extremely
The phase current of motor.
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 input current, input voltage, phase current and presetting electricity
Machine speed reference determines inductive drop reference value.
Specifically, inductive drop reference value determining unit 220 is additionally operable to calculate motor speed actual value according to phase current.
Inductive drop reference value determining unit 220 is additionally operable to join according to motor speed actual value and presetting motor speed
Value determination torque current reference is examined, its calculation formula is as follows：
IT_Ref=Kp2*(Wr_Ref-Wr)+Ki2*∫(Wr_Ref-Wr)dt
Wherein, IT_RefFor torque current reference, Wr_RefFor motor speed reference value, WrFor motor speed actual value, Kp2
For the second presetting proportionality coefficient, Ki2For presetting second integral coefficient.
Inductive drop reference value determining unit 220 is additionally operable to calculate input electricity according to torque current reference, input voltage
Reference value is flowed, calculation formula is as described below：
iac_Ref=K*uac*IT_Ref
Wherein, iac_RefFor input current reference value, uacFor input voltage, K is presetting proportionality coefficient.
Inductive drop reference value determining unit 220 is additionally operable to true according to torque current reference and input current reference value
Determine inductive drop reference value, its calculation formula is as follows：
Uout=Kp3*(iac_Ref-iac)+Ki3*∫(iac_Ref-iac)dt
Wherein, UoutFor inductive drop reference value, iac_RefFor input current reference value, iacFor input current, Kp3It is default
The 3rd fixed proportionality coefficient, Ki3For presetting third integral coefficient.
It is to be appreciated that inductive drop reference value determining unit 220 can be used for performing step S302, sub-step S3021, son
Step S3022, sub-step S3023 and sub-step S3024.
Voltage specified rate determining unit 230 is used to determine q axles according to input current, input voltage, busbar voltage, phase current
Voltage specified rate and d shaft voltage specified rates.
Specifically, voltage specified rate determining unit 230 is used to calculate q shaft currents and d shaft currents according to phase current.
Voltage specified rate determining unit 230 is additionally operable to determine q shaft currents according to input current, input voltage, busbar voltage
Reference value.
First, voltage specified rate determining unit 230 is used to calculate the according to input current, input voltage and busbar voltage
One DC bus current, its calculation formula are as described below：
Wherein, Idc1For the first DC bus current.
It should be noted that the first DC bus current is the electric current of dc-link capacitance prime.
Secondly, voltage specified rate determining unit 230 is used for according to busbar voltage, input voltage, q shaft currents and q shaft currents
Calculate the second DC bus current.
Specifically, the second DC bus current can be calculated by following formula：
Wherein, PMotorFor power of motor, idc2For the second DC bus current.
Then, voltage specified rate determining unit 230 is used for according to busbar voltage and presetting busbar voltage reference value
Calculate DC bus current compensation rate.
Specifically, DC bus current compensation rate can be calculated by following PI regulative modes：
Δidc=Kp4*(Udc_Ref-udc)+Ki4*∫(Udc_Ref-udc)dt
Wherein, udcFor busbar voltage, Udc_RefFor presetting busbar voltage reference value, Δ idcMended for DC bus current
The amount of repaying, Kp4For the 4th presetting proportionality coefficient, Ki4For the 4th presetting integral coefficient.
It is to be appreciated that by carrying out PI regulations to busbar voltage, the DC bus current compensation finally drawn may be such that
Measure Δ idcMeet formula idc2=idc1-Δidc。
Finally, voltage specified rate determining unit 230 be used for according to the first DC bus current, the second DC bus current with
And DC bus current compensation rate determines q shaft current reference values.
Specifically, q shaft current reference values can be determined by PI regulative modes：
Iq_Ref=Kp1*(idc1-idc+Δidc)+Ki1*∫(idc1-idc+Δidc)dt
Wherein, Iq_RefFor q shaft current reference values, Kp1For the first presetting proportionality coefficient, Ki1For the first presetting product
Divide coefficient.
It is to be appreciated that voltage specified rate determining unit 230 is additionally operable to calculate q according to q shaft currents and q shaft currents reference value
Shaft voltage specified rate.
Voltage specified rate determining unit 230 is additionally operable to calculate d axles according to d shaft currents and presetting d shaft currents reference value
Voltage specified rate.
It is to be appreciated that voltage specified rate determining unit 230 can be used for performing step S303, sub-step S3031, sub-step
S3032, sub-step S3033, sub-step S3034, sub-step S30321, sub-step S30322, sub-step S30323 and sub-step
Rapid S30324.
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 input electricity received
Stream, input voltage, phase current and presetting motor speed reference value determine inductive drop reference value, then according to phase current,
Input current, input voltage and busbar voltage determine q shaft voltages specified rate and d shaft voltage specified rates, then respectively according to inductance
Voltage reference value and q shaft voltages specified rate and d shaft voltages specified rate generate the first pulse-width signal, the second pulsewidth modulation letter
Number, wherein adjusting the electric current of dc-link capacitance front end by the first pulse-width signal, adjusted by the second pulse-width signal
The voltage of motor is saved, so that the power-balance of dc-link capacitance rear and front end, reduces dc-link capacitance ripple current；
Simultaneously because the electric current of dc-link capacitance front stage is of substantially equal, therefore dc-link capacitance only needs to store less work(
Rate, so as to be substituted using the less thin-film capacitor of capacity.
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 and input are received to the phase current of motor；
Inductance is determined according to the input current, the input voltage, the phase current and presetting motor speed reference value
Voltage reference value；
Q shaft voltages specified rate and d are determined according to the input current, the input voltage, the busbar voltage, the phase current
Shaft voltage specified rate；
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 input current, institute
The step of input voltage, the busbar voltage and the phase current determine q shaft voltages specified rate and d shaft voltage specified rates is stated to wrap
Include：
Q shaft currents and d shaft currents are calculated according to the phase current；
Q shaft current reference values are determined according to the input current, the input voltage, the busbar voltage；
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.
3. power conversion control method according to claim 2, it is characterised in that described according to the input current, institute
State input voltage, the step of busbar voltage determines q shaft current reference values includes：
The first DC bus current is calculated according to the input current, the input voltage and the busbar voltage；
The second dc bus electricity is calculated according to the busbar voltage, the input voltage, the q shaft currents and the q shaft currents
Stream；
DC bus current compensation rate is calculated according to the busbar voltage and presetting busbar voltage reference value；
It is true according to first DC bus current, second DC bus current and the DC bus current compensation rate
Determine q shaft current reference values.
4. power conversion control method according to claim 3, it is characterised in that described according to first dc bus
The step of electric current, second DC bus current and the DC bus current compensation rate determine q shaft current reference values is wrapped
Include：
Pass through formula Iq_Ref=Kp1*(idc1-idc2+Δidc)+Ki1*∫(idc1-idc+Δidc) dt determines q shaft currents reference
Value, wherein, Iq_RefFor q shaft current reference values, idc1For the first DC bus current, idc2For the second DC bus current, Δ idc
For DC bus current compensation rate, Kp1For the first presetting proportionality coefficient, Ki1For presetting first integral coefficient.
5. power conversion control method according to claim 1, it is characterised in that described according to the input current, institute
Stating the step of input voltage, the phase current and presetting motor speed reference value determine inductive drop reference value includes：
Motor speed actual value is calculated according to the phase current；
Torque current reference is determined according to the motor speed actual value and the presetting motor speed reference value；
Input current reference value is calculated according to the torque current reference, the input voltage；
The inductive drop reference value is determined according to the torque current reference and the input current reference value.
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 and input to the phase electricity of motor
Stream；
Inductive drop reference value determining unit, for according to the input current, the input voltage, the phase current and default
Fixed motor speed reference value determines inductive drop reference value；
Voltage specified rate determining unit, for according to the input current, the input voltage, the busbar voltage, the phase
Electric current determines 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 voltage specified rate determining unit is also
For calculating q shaft currents and d shaft currents according to the phase current；
The voltage specified rate determining unit is additionally operable to true according to the input current, the input voltage, the busbar voltage
Determine 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.
8. power conversion control device according to claim 7, it is characterised in that the voltage specified rate determining unit is also
For calculating the first DC bus current according to the input current, the input voltage and the busbar voltage；
The voltage specified rate determining unit is additionally operable to according to the busbar voltage, the input voltage, the q shaft currents and institute
State q shaft currents and calculate the second DC bus current；
The voltage specified rate determining unit is additionally operable to according to the busbar voltage and presetting busbar voltage reference value meter
Calculate DC bus current compensation rate；
The voltage specified rate determining unit is additionally operable to according to first DC bus current, second DC bus current
And the DC bus current compensation rate determines q shaft current reference values.
9. power conversion control device according to claim 8, it is characterised in that the voltage specified rate determining unit is also
For passing through formula
Iq_Ref=Kp*(idc1-idc2+Δidc)+Ki*∫(idc1-idc+Δidc) dt determines the q shaft currents reference value, wherein,
Iq_RefFor q shaft current reference values, idc1For the first DC bus current, idc2For the second DC bus current, Δ idcIt is female for direct current
Line current compensation rate.
10. power conversion control device according to claim 6, it is characterised in that the inductive drop reference value determines
Unit is additionally operable to calculate motor speed actual value according to the phase current；
The inductive drop reference value determining unit is additionally operable to according to the motor speed actual value and the presetting motor
Speed reference determines torque current reference；
The inductive drop reference value determining unit is additionally operable to defeated according to the torque current reference, input voltage calculating
Enter current reference value；
The inductive drop reference value determining unit is additionally operable to according to the torque current reference and input current ginseng
Examine value and determine the inductive drop reference value.
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