CN107359843A - Power conversion control system - Google Patents
Power conversion control system Download PDFInfo
- Publication number
- CN107359843A CN107359843A CN201710597270.9A CN201710597270A CN107359843A CN 107359843 A CN107359843 A CN 107359843A CN 201710597270 A CN201710597270 A CN 201710597270A CN 107359843 A CN107359843 A CN 107359843A
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- CN
- China
- Prior art keywords
- voltage
- shaft
- phase current
- control module
- power conversion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
- 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
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/50—Reduction of harmonics
Landscapes
- 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 system, is related to variable-frequency driving technique field.The power conversion control system generates pulse-width signal by control module according to supply voltage, busbar voltage, the phase current of input to motor and the presetting motor speed reference value that circuit parameter acquisition module gathers and transmits, so as at alternating voltage peak, controlled motor exports larger power, and near alternating voltage zero-crossing point, controlled motor exports smaller power, so that input current waveform is smaller near alternating voltage zero-crossing point, reduce current harmonics, power factor is increased, also the operating efficiency of motor is enhanced.
Description
Technical field
The present invention relates to variable-frequency driving technique field, in particular to a kind of power conversion control system.
Background technology
Compressor is a kind of driven fluid machinery that low-pressure gas is promoted to gases at high pressure, and compressor operating needs
The drive of motor.
In the prior art, the power that motor absorbs is firm power, power and alternating voltage at alternating voltage peak
Near zero-crossing point power indifference, and near zero-crossing point because Aiternating Current Voltage Ratio is relatively low, therefore zero crossing goes to capital electric current to compare
Greatly, so as to cause AC input current not to be sinusoidal waveform, power factor is relatively low, and harmonic current is bigger, causes compression electromechanical
The operating efficiency of machine is low.
The content of the invention
It is an object of the invention to provide a kind of power conversion control system, to reduce harmonic current, improves power factor.
To achieve these goals, the technical scheme that the embodiment of the present invention uses is as follows：
The embodiments of the invention provide a kind of power conversion control system, the power conversion control system includes：Circuit
Parameter collection module, drive module, control module and motor, the drive module, the circuit parameter acquisition module and institute
State control module to be sequentially connected electrically, the drive module electrically connects with the control module and the motor；
The circuit parameter acquisition module is used to gather supply voltage, busbar voltage and the input in the drive module
To the phase current of the motor, and the supply voltage, the busbar voltage and the phase current are transmitted to the control
Module；
The control module is used for according to the supply voltage, the busbar voltage, the phase current and presetting
Motor speed reference value generates pulse-width signal, and the pulse-width signal is transmitted to the drive module；
The drive module is used to control the motor operating according to the pulse-width signal.
Further, the control module be used for according to the supply voltage, the busbar voltage, the phase current and
Presetting motor speed reference value calculates q shaft voltages command value and d shaft voltage command values, and is instructed according to the q shaft voltages
Value and the d shaft voltages command value generate the pulse-width signal.
Further, the control module is used for according to the supply voltage, the phase current and the presetting electricity
Machine speed reference calculates q shaft voltage command values.
Further, the control module is used to turn according to the supply voltage, the phase current and presetting motor
Fast reference value calculates value and power reference；And pass through formula uq=Kp1*(iq_Ref-iq)+Ki1*∫(iq_Ref-iq) the dt calculating q axles
Command voltage value, wherein, uqFor q axle command voltage values, iq_RefFor q shaft current reference values, iqFor q shaft currents, Kp1To be presetting
The first proportionality coefficient, Ki1For presetting first integral coefficient.
Further, the control module is used to pass through formulaCalculate the q shaft currents ginseng
Value is examined, wherein, iq_RefFor q shaft current reference values, PRefFor value and power reference, Ud is d axle current voltages, and Uq is that q axles are currently electric
Pressure, idFor d shaft currents.
Further, the control module is used to calculate the instruction of d shaft voltages according to the busbar voltage, the phase current
Value.
Further, the control module is used to calculate the reference of d shaft currents according to the busbar voltage, the phase current
Value, and pass through formula ud=Kp3*(id_Ref-id)+Ki3*∫(id_Ref-id) the dt calculating d shaft voltages command value, wherein, udFor d
Axle command voltage value, id_RefFor d shaft current reference values, idFor d shaft currents, Kp3For the 3rd presetting proportionality coefficient, Ki3To be pre-
The third integral coefficient of setting.
Further, the control module is used to pass through formulaCalculate
The d shaft currents reference value, wherein,η is presetting voltage utilization, udcFor busbar voltage, Iq is pre-
The q shaft current specified rates of setting, ωrFor motor speed actual value, ψ is the rotor permanent magnet magnetic linkage of motor, and Ld is d axle inductances,
id_refFor d shaft current reference values.
Further, the drive module includes power circuit, rectification circuit, thin-film capacitor and inverter circuit, described
Power circuit, the rectification circuit, the thin-film capacitor and the inverter circuit are sequentially connected electrically.
Further, the circuit parameter acquisition module include supply voltage collecting unit, busbar voltage collecting unit with
And phase current collecting unit, the supply voltage collecting unit and the busbar voltage collecting unit respectively with the control mould
Block and drive module electrical connection, the phase current collecting unit electrically connect with the motor；
The supply voltage collecting unit is used to gather the supply voltage, and the supply voltage is transmitted to the control
Molding block；
The busbar voltage collecting unit is used to gather the busbar voltage, and the busbar voltage is transmitted to the control
Molding block；
The phase current collecting unit is used to gather the phase current, and the phase current is transmitted to the control mould
Block.
Power conversion control system provided in an embodiment of the present invention, adopted by control module according to circuit parameter acquisition module
Supply voltage, busbar voltage, the phase current of input to motor and the generation of presetting motor speed reference value for collecting and transmitting
Pulse-width signal, so that at alternating voltage peak, controlled motor exports larger power, and attached in alternating voltage zero-crossing point
Closely, controlled motor output smaller power, so that input current waveform is smaller near alternating voltage zero-crossing point, reduces electricity
Harmonic wave is flowed, increases power factor, also the operating efficiency of motor is enhanced.
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 functional block diagram of circuit parameter acquisition module.
Fig. 3 shows the circuit structure block diagram of drive module.
Fig. 4 shows the circuit diagram of drive module.
Icon：100- power conversion control systems；110- circuit parameter acquisition modules；112- supply voltage collecting units；
114- busbar voltage collecting units；116- phase current collecting units；120- control modules；130- drive modules；132- power supplys electricity
Road；134- rectification circuits；136- thin-film capacitors；138- inverter circuits；140- motors.
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.
Embodiment
Referring to Fig. 1, show the circuit structure block diagram of power conversion control system 100 provided in an embodiment of the present invention.Should
Power conversion control system 100 includes circuit parameter acquisition module 110, drive module 130, control module 120 and motor
140, drive module 130, circuit parameter acquisition module 110 and control module 120 are sequentially connected electrically, drive module 130 and control
Module 120 and motor 140 electrically connect.
Wherein, circuit parameter acquisition module 110 is used to gather supply voltage, busbar voltage and input to motor 140
Phase current, and supply voltage, busbar voltage, phase current are transmitted to control module 120.
Referring to Fig. 2, show the functional block diagram of circuit parameter acquisition module 110.Circuit parameter acquisition module 110 wraps
Include, supply voltage collecting unit 112, busbar voltage collecting unit 114 and phase current collecting unit 116.Wherein, supply voltage
Collecting unit 112, busbar voltage collecting unit 114 and phase current collecting unit 116 electrically connect with control module 120 respectively.
Supply voltage collecting unit 112 is used to gather power input voltage, and power input voltage is transmitted to control mould
Block 120.In a kind of preferred embodiment, the voltage transformer of supply voltage collecting unit 112, electrically connected with drive module 130.
Busbar voltage collecting unit 114 is used to gather busbar voltage, and busbar voltage is transmitted to control module 120.
Phase current collecting unit 116 is used to gather phase current, and phase current is transmitted to control module 120.A kind of excellent
In the embodiment of choosing, phase current collecting unit 116 is also Hall current sensor, is electrically connected with drive module 130 and motor 140
Connect.
Control module 120 is used for according to supply voltage, busbar voltage, phase current and presetting motor speed reference value
Pulse-width signal is generated, and pulse-width signal is transmitted to drive module 130.
Specifically, control module 120 is used to turn according to supply voltage, busbar voltage, phase current and presetting motor
Fast reference value calculates q shaft voltages command value and d shaft voltage command values, and is given birth to according to q shaft voltages command value and d shaft voltages command value
Into pulse-width signal.
Wherein, control module 120 is used to calculate q according to supply voltage, phase current and presetting motor speed reference value
Shaft voltage command value, its calculating process are as follows：
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 140, 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 140 is calculated by following formula：
θ (n)=θ (n-1)+Δ θ
Then, motor speed actual value ωrFor：
Secondly, according to presetting motor speed reference value and motor speed calculated with actual values mean power reference value
Pavr_Ref, its calculation formula is as follows：
Pavr_Ref=Kp3*(ωr_Ref-ωr)+Ki3*∫(ωr_Ref-ωr)dt
Wherein, Pavr_RefFor mean power reference value, ωr_RefFor motor speed reference value, ωrIt is actual for motor speed
Value, Kp3For the 3rd presetting proportionality coefficient, Ki3For presetting third integral coefficient.
Then, value and power reference is calculated according to mean power reference value and supply voltage：
PRef=Pavr_Ref*uac*uac
Wherein, uacFor supply voltage.
Then, q shaft current reference values are calculated according to value and power reference and phase current：
Wherein, iq_RefFor q shaft current reference values, PRefFor value and power reference, Ud is d axle current voltages, and Uq is that q axles are current
Voltage, idFor d shaft currents.
Finally, q axle command voltage values are calculated according to q shaft currents reference value and phase current：
uq=Kp1*(iq_Ref-iq)+Ki1*∫(iq_Ref-iq)dt
Wherein, uqFor q axle command voltage values, iq_RefFor q shaft current reference values, iqFor q shaft currents, Kp1For presetting
One proportionality coefficient, Ki1For presetting first integral coefficient.
Control module 120 is used to calculate d shaft voltage command values according to busbar voltage, phase current.
First, d shaft current reference values are calculated according to q shaft currents and busbar voltage：
Wherein,η is presetting voltage utilization, udcFor busbar voltage, Iq is presetting q axles
Given value of current amount, ωrFor motor speed actual value, ψ is the rotor permanent magnet magnetic linkage of motor 140, and Ld is d axle inductances.
Then, d shaft voltage command values are calculated according to d shaft currents reference value and d shaft currents：
ud=Kp2*(id_Ref-id)+Ki2*∫(id_Ref-id)dt
Wherein, udFor d axle command voltage values, id_RefFor d shaft current reference values, idFor d shaft currents, Kp2For presetting
Two proportionality coefficients, Ki2For presetting second integral coefficient.
Control module 120 is additionally operable to according to q shaft voltages command value and d shaft voltages command value generation pulse-width signal.
Specifically, pulse-width signal includes bridge conducting dutycycle information on the three-phase of motor 140, and inversion module foundation accounts for
Sky is than information on or off.It is to be appreciated that duty cycle information can be calculated by following formula：
First, the three-phase output pulse width of motor 140 is calculated according to d axle command voltage values and q axle command voltages value.
uα=ud cosθ-uq sinθ
uβ=ud sinθ+uq cosθ
uu=uα
Bridge conducting dutycycle on the three-phase of motor 140 is calculated according to three-phase output pulse width.
Referring to Fig. 3, show the circuit structure block diagram of drive module 130.Drive module 130 include power circuit 132,
Rectification circuit 134, thin-film capacitor 136 and inverter circuit 138；Wherein, power circuit 132, rectification circuit 134, thin-film capacitor
136 and inverter circuit 138 be sequentially connected electrically.
Referring to Fig. 4, show the circuit diagram of drive module 130.Wherein, power circuit 132 provides alternating current for circuit；
It is direct current that rectification circuit 134, which is used for convert alternating current,；Thin-film capacitor 136 is used to filter after the rectified rectification of circuit 134 still
So existing alternating current；Inverter circuit 138 electrically connects with control module 120, under the control of pulse-width signal, exporting
Voltage realizes the control to motor 140 to motor 140.
In summary, power conversion control system provided in an embodiment of the present invention, by control module according to circuit parameter
Supply voltage, busbar voltage, the phase current of input to motor and the presetting motor speed that acquisition module is gathered and transmitted
Reference value generates pulse-width signal, so that at alternating voltage peak, controlled motor exports larger power, and in alternating current
Press through zero crossings, controlled motor output smaller power so that input current waveform near alternating voltage zero-crossing point compared with
It is small, current harmonics is reduced, increases power factor, also the operating efficiency of motor is enhanced.
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 system, it is characterised in that the power conversion control system includes：Circuit parameter gathers mould
Block, drive module, control module and motor, the drive module, the circuit parameter acquisition module and the control module
It is sequentially connected electrically, the drive module electrically connects with the control module and the motor；
The circuit parameter acquisition module is for gathering the supply voltage in the drive module, busbar voltage and input to institute
The phase current of motor is stated, and the supply voltage, the busbar voltage and the phase current are transmitted to the control module；
The control module is used for according to the supply voltage, the busbar voltage, the phase current and presetting motor
Speed reference generates pulse-width signal, and the pulse-width signal is transmitted to the drive module；
The drive module is used to control the motor operating according to the pulse-width signal.
2. power conversion control system as claimed in claim 1, it is characterised in that the control module is used for according to the electricity
Source voltage, the busbar voltage, the phase current and presetting motor speed reference value calculate q shaft voltages command value and d
Shaft voltage command value, and generate the pulse-width signal according to the q shaft voltages command value and the d shaft voltages command value.
3. power conversion control system as claimed in claim 1, it is characterised in that the control module is used for according to the electricity
Source voltage, the phase current and the presetting motor speed reference value calculate q shaft voltage command values.
4. power conversion control system as claimed in claim 3, it is characterised in that the control module is used for according to the electricity
Source voltage, the phase current and presetting motor speed reference value calculate value and power reference, and pass through formula uq=Kp1*
(iq_Ref-iq)+Ki1*∫(iq_Ref-iq) the dt calculating q axles command voltage value, wherein, uqFor q axle command voltage values, iq_RefFor q
Shaft current reference value, iqFor q shaft currents, Kp1For the first presetting proportionality coefficient, Ki1For presetting first integral coefficient.
5. power conversion control system as claimed in claim 4, it is characterised in that the control module is used to pass through formulaThe q shaft currents reference value is calculated, wherein, iq_RefFor q shaft current reference values, PRefJoin for power
Examine value, Ud is d axle current voltages, and Uq is q axle current voltages, idFor d shaft currents.
6. power conversion control system as claimed in claim 1, it is characterised in that the control module is used for according to the mother
Line voltage, the phase current calculate d shaft voltage command values.
7. power conversion control system as claimed in claim 6, it is characterised in that the control module is used for according to the mother
Line voltage, the phase current calculate d shaft current reference values, and pass through formula ud=Kp2*(id_Ref-id)+Ki2*∫(id_Ref-id)dt
The d shaft voltages command value is calculated, wherein, udFor d axle command voltage values, id_RefFor d shaft current reference values, idFor d shaft currents,
Kp2For the second presetting proportionality coefficient, Ki2For presetting second integral coefficient.
8. power conversion control system as claimed in claim 7, it is characterised in that the control module is used to pass through formulaThe d shaft currents reference value is calculated, wherein,η is pre-
The voltage utilization of setting, udcFor busbar voltage, Iq is presetting q shaft current specified rates, ωrFor motor speed actual value, ψ
For the rotor permanent magnet magnetic linkage of motor, Ld is d axle inductances, id_refFor d shaft current reference values.
9. the power conversion control system as described in any one in claim 1-8, it is characterised in that the drive module bag
Include power circuit, rectification circuit, thin-film capacitor and inverter circuit, the power circuit, the rectification circuit, the thin-film electro
Hold and the inverter circuit is sequentially connected electrically.
10. the power conversion control system as described in any one in claim 1-8, it is characterised in that the circuit parameter
Acquisition module includes supply voltage collecting unit, busbar voltage collecting unit and phase current collecting unit, the supply voltage
Collecting unit and the busbar voltage collecting unit electrically connect with the control module and drive module respectively, the phase current
Collecting unit electrically connects with the motor；
The supply voltage collecting unit is used to gather the supply voltage, and the supply voltage is transmitted to the control mould
Block；
The busbar voltage collecting unit is used to gather the busbar voltage, and the busbar voltage is transmitted to the control mould
Block；
The phase current collecting unit is used to gather the phase current, and the phase current is transmitted to the control module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710597270.9A CN107359843B (en) | 2017-07-20 | 2017-07-20 | Power conversion control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710597270.9A CN107359843B (en) | 2017-07-20 | 2017-07-20 | Power conversion control system |
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| Publication Number | Publication Date |
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| CN107359843A true CN107359843A (en) | 2017-11-17 |
| CN107359843B CN107359843B (en) | 2018-07-31 |
Family
ID=60284574
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|---|---|---|---|
| CN201710597270.9A Active CN107359843B (en) | 2017-07-20 | 2017-07-20 | Power conversion control system |
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| CN112394236A (en) * | 2019-08-12 | 2021-02-23 | 青岛海尔空调电子有限公司 | Method for detecting electrical parameters of air conditioner compressor |
| CN112425054A (en) * | 2018-07-26 | 2021-02-26 | 伊莱克斯家用电器股份公司 | Inverter-based device and control method thereof |
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| Publication number | Publication date |
|---|---|
| CN107359843B (en) | 2018-07-31 |
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