CN106788114A - Suppress the control method and controller of compressor electric motor bit effect - Google Patents
Suppress the control method and controller of compressor electric motor bit effect Download PDFInfo
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- CN106788114A CN106788114A CN201710044023.6A CN201710044023A CN106788114A CN 106788114 A CN106788114 A CN 106788114A CN 201710044023 A CN201710044023 A CN 201710044023A CN 106788114 A CN106788114 A CN 106788114A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
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- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The present invention provides the control method and controller for suppressing compressor electric motor bit effect, including detection motor operating current；Extract the CF composition calculated in running current；CF composition according to running current calculates offset voltage；The DC bus-bar voltage that offset voltage is exported with frequency converter rectification circuit is superimposed, correction voltage is generated；Correction voltage feed back input to inversion circuit direct-flow input end；CF is equal to the frequency of alternating voltage flutter component, frequency and the converter power supply frequency positive correlation of alternating voltage flutter component.Also disclose a kind of controller.The present invention is by detecting motor operating current, determine influence of the alternating voltage flutter component to motor operating current, by extracting CF composition, and the offset voltage disturbed for bit effect is calculated according to CF composition, correction is compensated in the input of inverter circuit, so as to contrast the suppression that special efficacy is answered not increasing or have effectively achieved under conditions of changing hardware circuit.
Description
Technical field
The present invention relates to motor automatic control technology field, more particularly to a kind of control for suppressing compressor electric motor bit effect
Method processed.
Background technology
Frequency converter be using ac motor synchronous rotational speed with motor stator frequency change and change characteristic and realize
The device of motor speed adjusting operation.In existing compressor apparatus, the rotating speed of compressor electric motor is generally adjusted using frequency converter.
Conventional AC-DC-AC converter, direct current is changed into by rectification circuit by the AC power of power network, then by inverse
It is that frequency and the variable alternating current of amplitude supply alternating current generator to become circuit by DC inverter.Due to rectification circuit circuit in itself
Structure is limited, and the output of rectifying and wave-filtering is constantly present is pulsed, and this pulsation can be reflected in the output voltage of frequency converter, gone forward side by side
One step is embodied in the working voltage waveform of motor.When the pulsating volage that the frequency and rectifying and wave-filtering of the working voltage of motor are exported
Frequency it is close when, the phase angle between motor operation voltage and pulsating volage periodically changes, and week is formed in motor one end
The current perturbation of phase change, influences the work of motor.The disturbance of this mechanical periodicity is defined as bit effect.
The influence of current perturbation is generally reduced by the change of hardware configuration in the prior art, but, this would generally increase
The volume of circuit so that whole frequency converter becomes bulky complex.
The content of the invention
The present invention provides a kind of feedback, and rejection ratio special efficacy is answered under conditions of hardware configuration is not changed, and reduces
The influence of the current perturbation that bit effect is caused.
The present invention provides a kind of control method for suppressing compressor electric motor bit effect, comprises the following steps：Detection motor
Running current；
Extract the CF composition calculated in the running current；
CF composition according to the running current calculates offset voltage；
The DC bus-bar voltage that the offset voltage is exported with frequency converter rectification circuit is superimposed, correction voltage is generated；
The correction voltage feed back input to inversion circuit direct-flow input end；
The CF is equal to the frequency of alternating voltage flutter component, frequency and the change of the alternating voltage flutter component
Frequency device supply frequency positive correlation.
Further, the power supply is three-phase alternating current, further comprising the steps of：
Detection power phase；
Detect the motor operating current
Extract the CF composition calculated in a wherein phase motor operating current；
CF composition in a tested phase motor operating current calculates offset voltage.
Further, the CF composition of each period 1 detection once wherein phase of the running current.
Further, the correction voltage feed back input to the frequency converter control circuit input, the correction
The peak value of voltage is carrier voltage peak value；The control circuit is according to the PWM crest value of setting and the peak value of correction voltage
Ratio calculation machine phase voltages PWM ratio.
Further, the CF composition of the running current gets offset voltage in period 1 inner product；It is described
The DC voltage that offset voltage is exported after postponing a period 1 with frequency converter rectification circuit is superimposed, and generates correction voltage.
The control method for suppressing compressor electric motor bit effect disclosed in this invention, by detecting motor operating current,
Influence of the alternating voltage flutter component to motor operating current is calculated and isolated, the specific frequency of running current is calculated by extracting
Rate composition, and the offset voltage disturbed for bit effect is calculated according to the CF composition of running current, in inverter circuit
Input compensate correction, so as to answer not increasing or contrast special efficacy is have effectively achieved under conditions of changing hardware circuit
Suppression, optimize compressor electric motor running status.
The present invention discloses a kind of controller for suppressing compressor electric motor bit effect, including：
Current detection module, the current detection module is used to detect the running current of the motor and generate motor operation
The waveform of electric current；
Current draw module, the current draw module be used for extract and calculate the CF in the running current into
Point；
Offset voltage computing module, the offset voltage computing module be used for according to the CF of the running current into
Divide and calculate offset voltage；
Correction voltage generation module, the correction voltage generation module is used to be superimposed the offset voltage and frequency converter rectification
The DC bus-bar voltage of circuit output, generates correction voltage；
Control module, the control module be used for motor described in output control output voltage, the control module it is defeated
Enter the end input correction voltage；
The CF is equal to the frequency of alternating voltage flutter component, frequency and the change of the alternating voltage flutter component
Frequency device supply frequency positive correlation.
Further, also include：
Phase detecting module, the phase detecting module is used to detect power phase and generates the initial phase angle of power phase.
Further, in each period 1, the current detection module detects once the running current wherein
The CF composition of one phase.
Further, also include：
Modulation ratio generation module, the modulation ratio generation module is used for PWM crest value and the school according to setting
The peak computational PWM ratio of positive voltage.
Further, also include：
Time delay module, the time delay module is used to cause that the offset voltage is whole with frequency converter after postponing a period 1
The DC voltage superposition of current circuit output, generates correction voltage.
The controller for suppressing compressor electric motor bit effect disclosed in this invention, is detected by current detection module and exchanged
Influence of the mains ripple component to motor operating current, by current draw module, extracts the CF for calculating running current
Composition, the compensation disturbed for bit effect is calculated by offset voltage computing module according to the CF composition of running current
Voltage, is not increasing or have effectively achieved under conditions of changing hardware circuit the suppression that contrast special efficacy is answered, and optimization compression is electromechanical
Machine running status.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are this hairs
Some bright embodiments, for those of ordinary skill in the art, without having to pay creative labor, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the flow of the first embodiment of the control method of suppression compressor electric motor bit effect disclosed in this invention
Figure；
Fig. 2 is the flow of second embodiment of control method of suppression compressor electric motor bit effect disclosed in this invention
Figure；
Fig. 3 is that the structure of controller the first embodiment of suppression compressor electric motor bit effect disclosed in this invention is shown
Meaning block diagram；
Fig. 4 is that the structure of second embodiment of controller of suppression compressor electric motor bit effect disclosed in this invention is shown
Meaning block diagram.
Specific embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
A part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
For compressor electric motor controls used AC-DC-AC converter, the DC bus-bar voltage of frequency converter is
Obtained by rectifying and wave-filtering by AC power, and further exported to the inverter circuit of frequency converter, as the defeated of inverter circuit
Enter signal, due to the influence of the current rectifying and wave filtering circuit inherently signal processing mode of structure, so DC bus-bar voltage can not
There is alternating voltage flutter component with avoiding.The input input of these alternating voltage flutter component self frequency-changing's device inverter circuits,
The arteries and veins being similar to included in the phase voltage for causing the output of inversion circuit for driving and controlling compressor electric motor to act
Dynamic component so that the harmonic components of machine phase voltages and phase current become increasingly complex.When the stator frequency of motor, i.e. frequency converter
When the output frequency of inverter circuit is equal or close to the frequency of alternating voltage flutter component, disturbance can be generated in electronics winding
DC current or the low-down disturbance alternating current of frequency, be also formed so-called bit effect.Bit effect can be right
Motor characteristic is impacted.
Shown in Figure 1 in order to solve the above problems, the present embodiment is using following methods rejection ratio special efficacy reply motor fortune
Capable influence.When motor is in running status, the motor operating current of motor operating state is detected.Calculate and extract motor fortune
CF composition in row electric current.CF composition according to running current calculates offset voltage.By offset voltage and change
The DC bus-bar voltage superposition of frequency device rectification circuit output, generates correction voltage.Correction voltage feed back input is inverse to frequency converter
Become the direct-flow input end of circuit, the influence by feedback inhibition bit effect to motor operation.
For a more specific step, the motor that compressor is used, the supply frequency of the frequency converter of usual control is single-phase
50Hz alternating currents or 50Hz three-phase alternating currents.For one-way communication electricity, shape after frequency converter rectification circuit full-wave rectification
Into alternating voltage flutter component frequency be supply frequency twice, i.e. 100Hz.Similar, for three-phase alternating current,
The frequency of the alternating voltage flutter component formed after frequency converter rectification circuit full-wave rectification is six times of supply frequency.For few
For compressor electric motor of the number under limiting condition or off-rating using nonstandard power supply Alternating Current Power Supply, alternating voltage pulsation
The frequency of component is likely to non-integral multiple for power supply frequency of supply.The frequency of alternating voltage flutter component is with converter power supply frequently
Rate positive correlation.So, by spy signified in the CF composition for detecting the running current that motor operating current extraction is calculated
Determine frequency of the frequency equal to alternating voltage flutter component, it is generally the case that equal to the twice of industrial-frequency alternating current supply frequency, i.e.,
100Hz.It should be noted that the voltage magnitude that other higher hamonic waves are formed in alternating voltage flutter component is very small, so handing over
Higher hamonic wave in stream mains ripple component can be ignored herein.
Further, the three-phase disturbed containing bit effect can be calculated by below equation in compressor electric motor one end
The current value of motor.
Wherein, Im-meanRepresent the average amplitude of current of electric；
Im-pulsaRepresent the current amplitude of the electric current AC ripple components that motor one end alternating voltage flutter component causes；
ωDCVRepresent the frequency of alternating voltage flutter component；
α represents the phase angle of alternating voltage flutter component；
ωINVRepresent the setting angular frequency of frequency converter.
Be can be seen that by above three formula and include in the three-phase phase current of compressor electric motor non-disturbance part and disturb
Dynamic part.Wherein disturbance part specifically includes the difference of correspondence frequency converter frequency and alternating voltage flutter component frequency in phase current
Part, this part is the direct embodiment that bit effect influences on current waveform.Meanwhile, by motor one end to motor reality
Run the detection of phase current in border, it is also possible to intuitively observe the compressor electric motor three-phase phase current comprising the disturbance of bit effect
Oscillogram.
As a example by using single-phase alternating current power supply, due to by the detection to current of electric, having obtained containing than special efficacy
The three-phase phase current waveform of the motor one end that should be disturbed.Meanwhile, by waveform and the analysis to above formula, can be clearly
Disturbance of the alternating voltage flutter component to phase voltage further causes the disturbance of the phase current of compressor electric motor one end, therefore root
According to the detection current waveform under the motor actual motion state for detecting, and alternating voltage flutter component frequency, Ke Yijin
One step decomposition computation goes out the current component of the CF of correspondence alternating voltage flutter component frequency.Obtaining correspondence alternating voltage
After the current component of the CF of flutter component frequency, correspondence can be calculated using the current component with CF
The offset voltage of alternating voltage flutter component frequency, and DC bus-bar voltage is compensated by offset voltage.Will compensation electricity
The DC bus-bar voltage exported with frequency converter rectification circuit is pressed to be superimposed generation correction voltage, by feedback compensation voltage to frequency converter
The direct-flow input end of inverter circuit, reduces proportion of the alternating voltage flutter component in DC bus-bar voltage, further right
The disturbance that bit effect is formed is suppressed in the input of inversion circuit.
Analysis and explanation more than, machine phase voltages frequency are close and equal to alternating voltage flutter component frequency
When, in addition it is also necessary to determine phase angle [alpha].So, it is shown in Figure 2 when converter power supply is three-phase alternating current, power supply is detected first
Phase, is calculated the initial phase angle of power phase, then extracts the CF composition for calculating a wherein phase running current, according to
The CF composition of a tested phase current calculates offset voltage.
Because bit effect is to be superimposed to repeat increase, reduction formation to electric moter voltage, current of electric within multiple cycles
Disturbance.The cycle for defining the sine wave of electric machine phase current is the period 1.Each period 1 is detected in a running current
The CF composition of a wherein phase.And according to the CF composition of the running current that separation proposition is detected in the period 1
The offset voltage voltage of calculating, and the DC bus-bar voltage of frequency converter is mended in next cycle using offset voltage
Repay, rejection ratio special efficacy should be superimposed in next period 1 and repeat increase, reduces formation to electric moter voltage, the disturbance of electric current.
A more specific step says that offset voltage is preferably embodied as being detected using within the period 1, separates first for calculating
Running current in cycle, to time integral within the period 1, calculates.Offset voltage is fed back to the direct current of frequency converter
Bus end, with frequency converter rectification circuit export DC bus-bar voltage be superimposed, inversion circuit input to exchange
Mains ripple component is suppressed, it is to avoid bit effect causes disturbance to current of electric.
In the prior art, frequency converter output voltage modulates generation by PWM technologies.It is preferred, therefore, that by the correction
Voltage Feedback is input into the input of the control circuit of frequency converter.The peak value of correction voltage is carrier voltage peak value.Control circuit
The peak computational PWM ratio of PWM crest value and correction voltage according to setting.Control circuit is preferably integrated in frequency conversion
Pwm chip in device.
Feedback disclosed in this invention, by detecting motor operating current, calculates and separates alternating voltage pulsation
Influence of the component to motor operating current, the CF composition of running current is calculated by extracting, and according to running current
CF composition calculates the offset voltage for the disturbance of bit effect, and correction is compensated in the input of inverter circuit, from
And do not increasing or have effectively achieved under conditions of changing hardware circuit the suppression that contrast special efficacy is answered, optimization compressor electric motor fortune
Row state.
Based on the control method of above-mentioned suppression compressor electric motor bit effect, compression is suppressed the present invention discloses one kind
The controller of electromechanical machine bit effect.Shown in Figure 3, controller is specifically included：
Current detection module, the current detection module is used to detect the running current of the motor and generate motor operation
The waveform of electric current.
Current draw module, the current draw module is used for running current and motor operating current according to the motor
Waveform extracting and calculate the CF composition in the running current.
Offset voltage computing module, the offset voltage computing module is based on the CF composition according to running current
Calculate and generate offset voltage.
Correction voltage generation module, the correction voltage generation module is used to be superimposed the offset voltage and frequency converter rectification
The DC bus-bar voltage of circuit output, generates correction voltage；
And control module, the control module be used for motor described in output control output voltage, control module it is defeated
Enter end input correction voltage；
The CF is equal to the frequency of alternating voltage flutter component, frequency and the change of the alternating voltage flutter component
Frequency device supply frequency positive correlation.
It is shown in Figure 4, in order to determine the phase of running current, in the suppression compressor electric motor ratio disclosed in the present embodiment
Also include phase detecting module in the controller that special efficacy is answered, the phase detecting module is used to detect power phase and generates power supply
The initial phase angle of phase.
Controller disclosed in the present embodiment, also including modulation ratio generation module, the modulation ratio generation module is used for root
According to the PWM crest value and the peak computational PWM ratio of the correction voltage of setting, and it is input into the control module
PWM unit input.
Repeat to increase or repeat to reduce to be formed to electric moter voltage, electricity because bit effect can be superimposed within multiple cycles
The disturbance of electromechanics stream, so, in each period 1, the current detection module detects that the running current is wherein successively
The CF composition of one phase.Further, time delay module is also included in the present embodiment, the time delay module is used to cause institute
State the DC voltage exported with frequency converter rectification circuit after offset voltage postpones a period 1 to be superimposed, generate correction voltage.
To cause that contrasting special efficacy in the continuous latter period 1 should be suppressed, it is to avoid the disturbance of generation is multiple continuous first
Continuous iteration increase, is contrasted effective suppression that special efficacy is answered in cycle.
The controller for suppressing compressor electric motor bit effect disclosed in this invention, is detected by current detection module and exchanged
Influence of the mains ripple component to motor operating current, by current draw module, extracts the CF for calculating running current
Composition, the compensation disturbed for bit effect is calculated by offset voltage computing module according to the CF composition of running current
Voltage, is not increasing or have effectively achieved under conditions of changing hardware circuit the suppression that contrast special efficacy is answered, and optimization compression is electromechanical
Machine running status.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
The present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those within the art that：It still may be used
Modified with to the technical scheme described in foregoing embodiments, or equivalent is carried out to which part technical characteristic；
And these modification or replace, do not make appropriate technical solution essence depart from various embodiments of the present invention technical scheme spirit and
Scope.
Claims (10)
1. it is a kind of suppress compressor electric motor bit effect control method, it is characterised in that
Comprise the following steps：
Detection motor operating current；
Extract the CF composition calculated in the running current；
CF composition according to the running current calculates offset voltage；
The DC bus-bar voltage that the offset voltage is exported with frequency converter rectification circuit is superimposed, correction voltage is generated；
The correction voltage feed back input to inversion circuit direct-flow input end；
The CF is equal to the frequency of alternating voltage flutter component, the frequency and frequency converter of the alternating voltage flutter component
Supply frequency positive correlation.
2. it is according to claim 1 suppress compressor electric motor bit effect control method, it is characterised in that the power supply
It is three-phase alternating current, it is further comprising the steps of：
Detection power phase；
Detect the motor operating current
Extract the CF composition calculated in a wherein phase motor operating current；
CF composition in a tested phase motor operating current calculates offset voltage.
3. the control method for suppressing compressor electric motor bit effect according to claim 2, it is characterised in that each the
The CF composition of an one cycle detection once wherein phase of the running current.
4. it is according to claim 3 suppress compressor electric motor bit effect control method, it is characterised in that the correction
Voltage Feedback is input into the input of the control circuit of the frequency converter, and the peak value of the correction voltage is carrier voltage peak value；
PWM of the control circuit according to the ratio calculation machine phase voltages of the peak value of the PWM crest value and correction voltage of setting
Modulation ratio.
5. it is according to claim 4 suppress compressor electric motor bit effect control method, it is characterised in that：The operation
The CF composition of electric current gets offset voltage in period 1 inner product；After the offset voltage postpones a period 1
The DC voltage exported with frequency converter rectification circuit is superimposed, and generates correction voltage.
6. it is a kind of suppress compressor electric motor bit effect controller, it is characterised in that including：
Current detection module, the current detection module is used to detect the running current of the motor and generate motor operating current
Waveform；
Current draw module, the current draw module is used to extract and calculate the CF composition in the running current；
Offset voltage computing module, the offset voltage computing module is based on the CF composition according to the running current
Calculate offset voltage；
Correction voltage generation module, the correction voltage generation module is used to be superimposed the offset voltage and frequency converter rectified current
The DC bus-bar voltage of road output, generates correction voltage；
Control module, the control module is used for the output voltage of motor described in output control, the input of the control module
It is input into the correction voltage；
The CF is equal to the frequency of alternating voltage flutter component, the frequency and frequency converter of the alternating voltage flutter component
Supply frequency positive correlation.
7. it is according to claim 6 suppress compressor electric motor bit effect controller, it is characterised in that also include：
Phase detecting module, the phase detecting module is used to detect power phase and generates the initial phase angle of power phase.
8. it is according to claim 7 suppress compressor electric motor bit effect controller, it is characterised in that：Each first
In cycle, the current detection module detects once the CF composition of a wherein phase of the running current.
9. it is according to claim 8 suppress compressor electric motor bit effect controller, it is characterised in that also include：
Modulation ratio generation module, the modulation ratio generation module is used for according to the PWM crest value of setting and correction electricity
The peak computational PWM ratio of pressure.
10. it is according to claim 9 suppress compressor electric motor bit effect controller, it is characterised in that also include：
Time delay module, the time delay module be used to the offset voltage is postponed a period 1 after with frequency converter rectified current
The DC voltage superposition of road output, generates correction voltage.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710044023.6A CN106788114B (en) | 2017-01-19 | 2017-01-19 | Inhibit the control method and controller of compressor electric motor bit effect |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710044023.6A CN106788114B (en) | 2017-01-19 | 2017-01-19 | Inhibit the control method and controller of compressor electric motor bit effect |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110247598A (en) * | 2018-03-09 | 2019-09-17 | 宝沃汽车（中国）有限公司 | Compensation method, compensation system, electric machine controller and the electric car of alternating current generator |
| CN112311216A (en) * | 2020-10-15 | 2021-02-02 | 湖南大学 | Current transformer overcurrent suppression method and device |
| CN112769357A (en) * | 2021-01-07 | 2021-05-07 | 上海威迈斯新能源有限公司 | Direct current motor soft start control method and system |
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| CN101188387A (en) * | 2006-11-22 | 2008-05-28 | 株式会社日立制作所 | Electric power conversion device |
| US9257931B2 (en) * | 2011-01-18 | 2016-02-09 | Daikin Industries, Ltd. | Power conversion apparatus |
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| CN110247598A (en) * | 2018-03-09 | 2019-09-17 | 宝沃汽车（中国）有限公司 | Compensation method, compensation system, electric machine controller and the electric car of alternating current generator |
| CN112311216A (en) * | 2020-10-15 | 2021-02-02 | 湖南大学 | Current transformer overcurrent suppression method and device |
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| CN106788114B (en) | 2019-03-01 |
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