CN107623474B - 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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- CN107623474B CN107623474B CN201711003419.2A CN201711003419A CN107623474B CN 107623474 B CN107623474 B CN 107623474B CN 201711003419 A CN201711003419 A CN 201711003419A CN 107623474 B CN107623474 B CN 107623474B
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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 voltage specified rate and d shaft voltage specified rate, the first pulse-width signal is generated according to inductive drop reference value and q shaft voltage specified rate and d shaft voltage 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, the voltage of motor is adjusted by the second pulse-width signal, 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 use the lesser thin-film capacitor substitution of capacity.
Description
Technical field
The present invention relates to variable-frequency driving technique fields, in particular to a kind of power conversion control method and device.
Background technique
China's motor ownership is big, and consumption electric energy is big, but efficiency is lower mostly.Permanent magnet synchronous motor is since it is with body
The features such as product is small, high-efficient, power factor is high, staring torque is big, heating is low, application is relatively broad.
Existing permanent magnet synchronous electric drive circuit stabilizes to DC voltage to provide to permanent magnet synchronous motor, power because
Number correction the rear ends (Power Factor Correction, PFC) be normally set up big electrolytic capacitor, but due to electrolytic capacitor before
End input power is fluctuated with alternating voltage phase, and the motor of rear end is constant power load, thus there are charge and discharges for electrolytic capacitor
Electric process, and biggish ripple current can be formed in the process, cause DC bus-bar voltage to fluctuate.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of power conversion control method and device, to solve above-mentioned ask
Topic.
To achieve the goals above, technical solution used in the embodiment of the present invention is as follows:
In a first aspect, the embodiment of the invention provides a kind of power conversion control method, the power conversion control method
Include:
Receive input current, input voltage, busbar voltage and the phase current for being input to motor；
Motor speed actual value, d shaft current and q shaft current are calculated according to the phase current；
According to the input current, the input voltage, the motor speed actual value and presetting motor speed ginseng
It examines value and determines inductive drop reference value；
According to the input current, the input voltage, the busbar voltage, the d shaft current and the q shaft current
Determine q shaft voltage specified rate and d 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 voltage specified rate and the d shaft voltage specified rate.
Second aspect, the embodiment of the invention also provides a kind of power conversion control device, the power conversion control dress
It sets and includes:
Circuit parameter receiving unit, for receiving input current, input voltage, busbar voltage and the phase for being input to motor
Electric current；
Computing unit, for calculating motor speed actual value, d shaft current and q shaft current according to the phase current；
Inductive drop reference value determination 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 determination unit, for according to the input current, the input voltage, the busbar voltage, institute
It states d shaft current and the q shaft current determines q shaft voltage specified rate and d shaft voltage specified rate；
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 voltage specified rate and the d shaft voltage 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 voltage specified rate and d shaft voltage specified rate, then respectively according to inductive drop reference value
And q shaft voltage specified rate and d shaft voltage specified rate generate the first pulse-width signal, the second pulse-width signal, wherein leading to
The electric current that the first pulse-width signal adjusts dc-link capacitance front end is crossed, the electricity of motor is adjusted by the second pulse-width signal
Pressure, so that the power-balance of dc-link capacitance rear and front end, reduces dc-link capacitance ripple current；Simultaneously because straight
The electric current for flowing bus capacitor front stage is of substantially equal, therefore dc-link capacitance only needs to store less power, so as to
It is substituted using the lesser thin-film capacitor of capacity.
To enable the above objects, features and advantages of the present invention to be clearer and more comprehensible, preferred embodiment is cited below particularly, and cooperate
Appended attached drawing, is described in detail below.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached 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 diagrams 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 specific flow chart of step S302 in Fig. 3.
Fig. 5 shows the specific flow chart of step S303 in Fig. 3.
Fig. 6 shows the specific flow chart of step S3032 in Fig. 5.
Fig. 7 shows the specific flow chart 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 system；110- circuit parameter acquisition module；120- drive module；130- motor；
The first pulse width modulation module of 140-；The first control module of 150-；The second pulse width modulation module of 160-；The second control module of 170-；
200- power conversion control device；210- circuit parameter receiving unit；220- inductive drop reference value determination unit；230- voltage
Specified rate determination unit；240- the first pulse-width signal generation unit；250- the second pulse-width signal generation unit.
Specific embodiment
Below in conjunction with attached drawing in the embodiment of the present invention, technical solution in the embodiment of the present invention carries out clear, complete
Ground description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Usually exist
The component of the embodiment of the present invention described and illustrated in attached drawing can be arranged and be designed with a variety of different configurations herein.Cause
This, is not intended to limit claimed invention to the detailed description of the embodiment of the present invention provided in the accompanying drawings below
Range, but it is merely representative of selected embodiment of the invention.Based on the embodiment of the present invention, those skilled in the art are not doing
Every other embodiment obtained under the premise of creative work out, shall fall within the protection scope of the present invention.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.Meanwhile of the invention
In description, term " first ", " second " etc. are only used for distinguishing description, are not understood to indicate or imply relative importance.
Referring to Fig. 1, showing 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 are electrically connected.
First pulse width modulation module 140 is electrically connected 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 for acquire input current, input voltage, busbar voltage, bus current with
And it is input to the phase current of motor 130, and busbar voltage, bus current, input voltage and input current are transmitted to first
Phase current, input voltage are transmitted to the second control module 170 by control module 150.
Referring to Fig. 2, the circuit diagram of power conversion control system 100 provided in an embodiment of the present invention.Power conversion control
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 are electrically connected with the second control module 170.
Wherein, power circuit provides alternating current for circuit；Rectification circuit is used to convert alternating current be direct current；Boosting electricity
Road is used to adjust the voltage value of dc-link capacitance；Dc-link capacitance, which is used to filtering, to be still had after rectified circuit rectifies
Alternating current；Inverter circuit is electrically connected 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 the first pulse-width signal is produced according to the inductive drop reference value.
First pulse width modulation module 140 is used to respond the first pulse-width signal and passes through the on-off shape for controlling booster circuit
State adjusts the electric current for being input to 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 voltage specified rate and d shaft voltage specified rate, and according to q axis
Voltage specified rate and d shaft voltage specified rate generate the second pulse-width signal.
Second pwm unit is for responding the second pulse-width signal and the on state by adjusting inverter module
Realize the control to 130 three-phase voltage of motor.
First embodiment
The embodiment of the invention provides a kind of power conversion control methods, are applied to power conversion control system 100.The function
Rate conversion control method is used for while reducing dc-link capacitance ripple, 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 the phase current for being input to motor 130 are received.
It is to be appreciated that input current, input voltage, busbar voltage and to be input to the phase current of motor 130 be electricity
Road parameter collection module 110 is acquired and is transmitted；In addition, in the present embodiment, the phase current for being input to motor 130 includes u phase
Electric current iuAnd v phase current 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, being the specific flow chart of step S302.Step S302 includes:
Sub-step S3021: motor speed actual value is calculated according to phase current.
Pass through u phase current i firstuAnd v phase current ivCalculate w phase current iw:
iw=-iu-iv
Then pass through u phase current iu, v phase current ivAnd w phase current iwIt calculates α shaft current and β shaft current, formula is as follows
It is shown:
iα=iu
The then calculation formula of q shaft current are as follows:
iq=iβcosθ-iαsinθ
The calculation formula of d shaft current are as follows:
id=iαcosθ+iβsinθ
Wherein, θ is the angle of 130 rotor permanent magnet magnetic linkage of motor, can be obtained by traditional position estimation algorithm, is counted
Calculation process is as follows:
It is first depending on d axis component and q axis component that following formula calculate counter electromotive force:
Wherein, the error of estimated angle and actual angle
Then the angle of 130 rotor permanent magnet magnetic linkage of motor 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, PI operation is done by the difference to motor speed actual value and presetting speed reference, 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, doing PI operation by the difference to input current reference value and input current can determine that inductive drop refers to
Value, 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
Fixed third proportionality coefficient, Ki3For presetting third integral coefficient.
Step S303: q shaft voltage specified rate and d axis are determined according to input current, input voltage, busbar voltage, phase current
Voltage specified rate.
Referring to Fig. 5, being the specific flow chart of step S303.Then step S303 includes:
Sub-step S3031: q shaft current and d shaft current are calculated according to phase current.
Based on the description of sub-step S3021, can learn
iq=iβcosθ-iαsinθ
id=iαcosθ+iβsinθ
Sub-step S3032: q shaft current reference value is determined according to input current, input voltage, busbar voltage.
Referring to Fig. 6, being the specific flow chart of 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 current and q shaft current
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 and is mended
The amount of repaying.
Specifically, DC bus current compensation rate can be calculated by following PI regulative mode:
Δidc=Kp4*(Udc_Ref-udc)+Ki4*∫(Udc_Ref-udc)dt
Wherein, udcFor busbar voltage, Udc_RefFor presetting busbar voltage reference value, Δ idcFor DC bus current benefit
The amount of repaying, Kp4For the 4th presetting proportionality coefficient, Ki4For the 4th presetting integral coefficient.
It is to be appreciated that may make the DC bus current finally obtained to compensate by carrying out PI adjusting to busbar voltage
Measure Δ idcMeet formula idc2=idc1-Δidc。
Sub-step S30324: it is 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 value.
Specifically, q shaft current reference value can be determined by PI regulative mode:
Iq_Ref=Kp1*(idc1-idc+Δidc)+Ki1*∫(idc1-idc+Δidc)dt
Wherein, Iq_RefFor q shaft current reference value, 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 value is determined using PI regulative mode, the electric current for flowing into dc-link capacitance is reduced, can be made
The electric current for obtaining dc-link capacitance front stage is almost equal, so that dc-link capacitance need to only store less power, thus can
It is substituted using the lesser thin-film capacitor of capacity.
Sub-step S3033: the q shaft voltage specified rate is calculated according to q shaft current and q shaft current reference value.
Specifically, q shaft voltage specified rate is calculated by following formula:
uq=Kp5*(Iq_Ref-Iq)+Ki5*∫(Iq_Ref-Iq)dt
Wherein, uqFor q shaft voltage specified rate, Kp5For the 5th presetting proportionality coefficient, Ki5For the 5th presetting integral
Coefficient.
Sub-step S3034: d shaft voltage specified rate is calculated according to d shaft current and presetting d shaft current reference value.
Specifically, d shaft voltage specified rate is calculated by following formula:
ud=Kp6*(Id_Ref-Id)+Ki6*∫(Id_Ref-Id)dt
Wherein, udFor d shaft voltage specified rate, Id_RefFor presetting d shaft current reference value, Kp6For the 6th presetting ratio
Example coefficient, Ki6For the 6th presetting integral coefficient.
In a kind of preferred embodiment, presetting d shaft current reference value is 0；When needing weak magnetic to control simultaneously, preset
Fixed d shaft current reference value 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 greater than the first presetting triangle wave amplitude, the first pulse-width signal
It is 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 voltage specified rate and d shaft voltage specified rate.
It please join figure and read Fig. 7, be the sub-step flow chart of step S305.Step S305 includes:
Sub-step S3051: three-phase output pulse width is calculated based on q shaft voltage specified rate and d shaft voltage 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: the target voltage values of U, V, W three-phase are calculated separately based on three-phase output pulse width and busbar voltage.
Specifically, the target voltage values of U, V, W three-phase pass through following formula respectively and calculate:
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 separately
U, the fiducial value of V, W three-phase.
Specifically, it is calculated by fiducial value of the following formula to U, V, W three-phase:
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: judging whether the fiducial value of U, V, W three-phase is greater than the second triangle wave amplitude respectively, if it is,
Execute sub-step S3055；If it is not, then executing sub-step S3056.
Judge whether CompU, CompV, CompW meet
Sub-step S3055: the value for determining that the second pulse-width signal corresponds to phase is 1.
For example, when meeting CompU > A, PWM_U=1；When meeting CompV > 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: the value for determining 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
When≤A, PWM_W=0.
Second embodiment
Referring to Fig. 8, a kind of power conversion control device 200 provided for present pre-ferred embodiments.It needs to illustrate
It is power conversion control device 200 provided by the present embodiment, the technical effect and above-described embodiment of basic principle and generation
Identical, to briefly describe, the present embodiment part does not refer to place, can refer to corresponding contents in the above embodiments.Power conversion
Control device 200 includes circuit parameter receiving unit 210, inductive drop reference value determination unit 220, the determining list of voltage specified rate
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 for acquiring input current, input voltage, busbar voltage and being input to
The phase current of motor.
It is to be appreciated that circuit parameter receiving unit 210 can be used for executing step S301.
Inductive drop reference value determination 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 determination unit 220 is also used to calculate motor speed actual value according to phase current.
Inductive drop reference value determination unit 220 is also used to according to motor speed actual value and presetting motor speed ginseng
It examines value and determines torque current reference, 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 determination unit 220 is also used 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 determination unit 220 is also used to true according to torque current reference and input current reference value
Determine inductive drop reference value, 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
Fixed third proportionality coefficient, Ki3For presetting third integral coefficient.
It is to be appreciated that inductive drop reference value determination unit 220 can be used for executing step S302, sub-step S3021, son
Step S3022, sub-step S3023 and sub-step S3024.
Voltage specified rate determination unit 230 is used to determine q axis according to input current, input voltage, busbar voltage, phase current
Voltage specified rate and d shaft voltage specified rate.
Specifically, voltage specified rate determination unit 230 is used to calculate q shaft current and d shaft current according to phase current.
Voltage specified rate determination unit 230 is also used to determine q shaft current according to input current, input voltage, busbar voltage
Reference value.
Firstly, voltage specified rate determination unit 230 is used to calculate the according to input current, input voltage and busbar voltage
One DC bus current, 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 determination unit 230 is used for according to busbar voltage, input voltage, q shaft current and q shaft current
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 determination 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 mode:
Δidc=Kp4*(Udc_Ref-udc)+Ki4*∫(Udc_Ref-udc)dt
Wherein, udcFor busbar voltage, Udc_RefFor presetting busbar voltage reference value, Δ idcFor DC bus current benefit
The amount of repaying, Kp4For the 4th presetting proportionality coefficient, Ki4For the 4th presetting integral coefficient.
It is to be appreciated that may make the DC bus current finally obtained to compensate by carrying out PI adjusting to busbar voltage
Measure Δ idcMeet formula idc2=idc1-Δidc。
Finally, voltage specified rate determination 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 value.
Specifically, q shaft current reference value can be determined by PI regulative mode:
Iq_Ref=Kp1*(idc1-idc+Δidc)+Ki1*∫(idc1-idc+Δidc)dt
Wherein, Iq_RefFor q shaft current reference value, Kp1For the first presetting proportionality coefficient, Ki1For the first presetting product
Divide coefficient.
It is to be appreciated that voltage specified rate determination unit 230 is also used to calculate q according to q shaft current and q shaft current reference value
Shaft voltage specified rate.
Voltage specified rate determination unit 230 is also used to calculate d axis according to d shaft current and presetting d shaft current reference value
Voltage specified rate.
It is to be appreciated that voltage specified rate determination unit 230 can be used for executing 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 executing step S304.
Second pulse-width signal generation unit 250 is used for given according to the q shaft voltage specified rate and the d shaft voltage
Amount generates the second pulse-width signal.
It is to be appreciated that the second pulse-width signal generation unit 250 can be used for executing step S305.
In conclusion 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 voltage specified rate and d shaft voltage specified rate, then respectively according to inductance
Voltage reference value and q shaft voltage specified rate and d shaft voltage 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, pass through the second pulse-width signal tune
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 function
Rate, so as to use the lesser thin-film capacitor substitution of capacity.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.It should also be noted that similar label and letter exist
Similar terms are indicated in following attached drawing, therefore, once being defined in a certain Xiang Yi attached drawing, are then not required in subsequent attached drawing
It is further defined and explained.
Claims (4)
1. a kind of power conversion control method, which is characterized in that the power conversion control method includes:
Receive input current, input voltage, busbar voltage and the phase current for being input to 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 current and d shaft current are calculated according to the phase current；
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 current and the d shaft current
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 value；
Q shaft voltage specified rate is calculated according to the q shaft current and the q shaft current reference value；
D shaft voltage specified rate is calculated according to the d shaft current and the presetting d shaft current reference value；
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 voltage specified rate and the d shaft voltage specified rate；
It is described to be compensated according to first DC bus current, second DC bus current and the DC bus current
Measuring the step of determining q shaft current reference value includes:
Pass through formula Iq_Ref=Kp1*(idc1-idc2+Δidc)+Ki1*∫(idc1-idc2+Δidc) dt determines q shaft current reference
Value, wherein Iq_RefFor q shaft current reference value, 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.
2. power conversion control method according to claim 1, which is characterized 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.
3. a kind of power conversion control device, which is characterized in that the power conversion control device includes:
Circuit parameter receiving unit, for receiving input current, input voltage, busbar voltage and the phase electricity for being input to motor
Stream；
Inductive drop reference value determination unit is used for according to the input current, the input voltage, the phase current and presets
Fixed motor speed reference value determines inductive drop reference value；
Voltage specified rate determination unit, for calculating q shaft current and d shaft current according to the phase current；
The voltage specified rate determination unit is also used to according to the input current, the input voltage and the busbar voltage
Calculate the first DC bus current；
The voltage specified rate determination unit is also used to according to the busbar voltage, the input voltage, the q shaft current and institute
It states d shaft current and calculates the second DC bus current；
The voltage specified rate determination unit is also used to according to the busbar voltage and presetting busbar voltage reference value meter
Calculate DC bus current compensation rate；
The voltage specified rate determination unit is also used to according to first DC bus current, second DC bus current
And the DC bus current compensation rate determines q shaft current reference value；
The voltage specified rate determination unit is also used to calculate q shaft voltage according to the q shaft current and the q shaft current reference value
Specified rate；
The voltage specified rate determination unit is also used to according to the d shaft current and the presetting d shaft current reference value meter
Calculate d shaft voltage specified rate；
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 being generated according to the q shaft voltage specified rate and the d shaft voltage specified rate
Second pulse-width signal；
The voltage specified rate determination unit is also used to through formula Iq_Ref=Kp1*(idc1-idc2+Δidc)+Ki1*∫(idc1-idc2
+Δidc) dt determines the q shaft current reference value, wherein Iq_RefFor q shaft current reference value, idc1For the first DC bus electricity
Stream, idc2For the second DC bus current, Δ idcFor DC bus current compensation rate, Kp1For the first presetting proportionality coefficient,
Ki1For presetting first integral coefficient.
4. power conversion control device according to claim 3, which is characterized in that the inductive drop reference value determines single
Member is also used to calculate motor speed actual value according to the phase current；
The inductive drop reference value determination unit is also used to according to the motor speed actual value and the presetting motor
Speed reference determines torque current reference；
The inductive drop reference value determination unit is also used to calculate according to the torque current reference, the input voltage defeated
Enter current reference value；
The inductive drop reference value determination unit is also used to join according to the torque current reference and the input current
It examines value and determines the inductive drop reference value.
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| CN112600405B (en) * | 2020-11-27 | 2022-07-15 | 深圳市科华恒盛科技有限公司 | Control method and device of unidirectional PFC circuit and terminal equipment |
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