CN106059329A - Dead-zone compensation method for frequency converter - Google Patents
Dead-zone compensation method for frequency converter Download PDFInfo
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- CN106059329A CN106059329A CN201610503256.3A CN201610503256A CN106059329A CN 106059329 A CN106059329 A CN 106059329A CN 201610503256 A CN201610503256 A CN 201610503256A CN 106059329 A CN106059329 A CN 106059329A
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- voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a dead-zone compensation method for a frequency converter. The method comprises: S01, according to an output current of a frequency converter, a corresponding compensation voltage value is generated in advanced; and S02, during the operation process, the frequency converter monitors the output current in real time and a corresponding compensation voltage value is searched based on the output current, thereby carrying out voltage compensation on a modulated voltage. According to the invention, the method has advantages of simple principle, simple and convenient operation, and good compensation effect and the like.
Description
Technical field
The invention mainly relates to Semiconductor Converting Technology field, refer in particular to a kind of frequency converter dead-time compensation method.
Background technology
At present, due to reasons such as dead band, tube voltage drop, control time delays, converter is difficult to or cannot output low frequency, particularly
Extremely low frequency sinusoidal current, and then result also in converter uncontrollable motor even load and realize low frequency and extremely low frequency normal table and transport
OK.It is presently mainly by the algorithm of some complexity or increases measurements etc. of some auxiliary and carry out dead area compensation, these compensation sides
Method is mostly can cross the online real-Time Compensation that the modes such as Theoretical Calculation are carried out.These dead-zone compensation methods are often theoretical multiple
Miscellaneous, algorithm is complicated, require real-time high-precision measure with calculate.
Summary of the invention
The technical problem to be solved in the present invention is that the technical problem existed for prior art, and the present invention provides one
Kind of principle is simple, easy and simple to handle and the obvious frequency converter dead-time compensation method of compensation effect.
For solving above-mentioned technical problem, the technical scheme that the present invention proposes is:
A kind of frequency converter dead-time compensation method, comprises the following steps:
S01, output electric current previously according to converter, generate corresponding compensation magnitude of voltage；
Output electric current, during running, is monitored by S02, converter in real time, and looks into according to output size of current
Look for the compensation magnitude of voltage of correspondence, so that modulation voltage is carried out voltage compensation.
Preferably, the detailed process of described step S01 is:
When S11, converter only export the most biphase phase voltage, ladder of phase voltage being started from scratch rises, real time record
Output modulation voltage that each ladder phase voltage is corresponding and actual current；Ladder of phase voltage being started from scratch declines, real time record
Output modulation voltage that each ladder phase voltage is corresponding and actual current；
S12, the data of record in step S11 are carried out curve fitting and obtain the curve of modulation voltage-actual current；
S13, curve to modulation voltage Yu actual current process the curve being compensated magnitude of voltage-actual current.
Preferably, the detailed process of described step S13 is:
S131, curve by modulation voltage Yu actual current obtain the curve of matching voltage-actual current:
Make UT(i)=i*k+ Δ U1(i) (1)
Wherein UTI () is modulation voltage, Δ U1I () represents the compensation magnitude of voltage that different actual current is corresponding, k is load electricity
Resistance；I is actual current；
Make UN(i)=i*k+ Δ U1 (2)
Wherein UNI () is matching voltage, Δ U1For the compensation voltage stabilization value after predetermined current；
S132, adjusted k value by curve matching and make the curve of modulation voltage-actual current and matching voltage-actual current
Curve region after predetermined current be completely superposed, so that it is determined that k value, formula (1) be compensated magnitude of voltage-reality electricity
The curve of stream.
Preferably, in step s 11, the output of converter connects the equivalent resistance sense load corresponding with actual loading.
Compared with prior art, it is an advantage of the current invention that:
The frequency converter dead-time compensation method of the present invention, by testing converter, will compensate magnitude of voltage and reality electricity
Stream sets up corresponding relation, when actual motion, compensates modulation voltage according to compensating magnitude of voltage, and its principle is simple, easily
Realize and compensation effect is obvious.
Accompanying drawing explanation
Fig. 1 is the method flow diagram of the present invention.
Fig. 2 is the equivalent circuit diagram that in the present invention, frequency converter A B phase exports.
Fig. 3 is the curve chart of modulation voltage in the present invention, matching voltage and actual current.
Fig. 4 is the curve chart compensating voltage and actual current in the present invention.
Fig. 5 is the voltage waveform view before compensating in the present invention.
Fig. 6 is the voltage waveform view after compensating in the present invention.
Detailed description of the invention
Below in conjunction with Figure of description and specific embodiment, the invention will be further described.
As shown in Figures 1 to 6, the frequency converter dead-time compensation method of the present embodiment, comprise the following steps:
S01, output electric current previously according to converter, generate corresponding compensation magnitude of voltage；
Output electric current, during running, is monitored by S02, converter in real time, and looks into according to output size of current
Look for the compensation magnitude of voltage of correspondence, so that modulation voltage is carried out voltage compensation.
In the present embodiment, the detailed process of step S01 is:
When S11, converter only export the most biphase phase voltage, ladder of phase voltage being started from scratch rises, real time record
Output modulation voltage that each ladder phase voltage is corresponding and actual current；Ladder of phase voltage being started from scratch declines, real time record
Output modulation voltage that each ladder phase voltage is corresponding and actual current；
S12, the data of record in step S11 are carried out curve fitting and obtain the curve of modulation voltage-actual current；
S13, curve to modulation voltage Yu actual current process the curve being compensated magnitude of voltage-actual current.
In the present embodiment, the detailed process of step S13 is:
S131, curve by modulation voltage Yu actual current obtain the curve of matching voltage-actual current:
Make UT(i)=i*k+ Δ U1(i) (1)
Wherein UTI () is modulation voltage, Δ U1I () represents the compensation magnitude of voltage that different actual current is corresponding, k is load electricity
Resistance；I is actual current；
Make UN(i)=i*k+ Δ U1 (2)
Wherein UNI () is matching voltage, Δ U1For the compensation voltage stabilization value after predetermined current；
S132, adjusted k value by curve matching and make the curve of modulation voltage-actual current and matching voltage-actual current
Curve region after predetermined current be completely superposed, so that it is determined that k value, formula (1) be compensated magnitude of voltage-reality electricity
The curve of stream.
It is embodied as step as follows: connecing as a example by equivalence resistance sense load by converter output, only to export AB phase electric when converter
During pressure (all pipes of C phase are all not turned on), the equivalent circuit that now frequency converter A B phase exports is as shown in Figure 2.
In the current range that load and converter allow, export positive direct-current voltages Uab, its value starts ladder from 0 and rises,
Ladder amplitude can be (can be to be fixed as one to be worth such as 5V, it is also possible to according to actual feelings according to loading condition unrestricted choice
Condition adjusts automatically), real time record each ladder output modulation voltage, actual current；At the electric current model that load and converter allow
In enclosing, export negative dc voltage Uab, its value starts ladder from 0 and rises, and ladder amplitude can be according to loading condition unrestricted choice
(can be to be fixed as a value such as-5V, it is also possible to automatically adjust according to practical situation), the output of real time record each ladder be adjusted
Voltage processed, actual current；
Record data are processed: carrying out curve fitting record data obtains modulation voltage-actual current curve (figure
Curve 1 in 3), and this curve is carried out process obtain matching voltage-actual current curve (curve 2 in Fig. 3)；Abscissa in figure
For actual current value, vertical coordinate is magnitude of voltage.
Each moment electric current is made to be: i, i.e. curve 1 numerical value corresponding with the abscissa in 2.
Corresponding modulating voltage is UTI (), this modulation voltage is phase voltage, for the magnitude of voltage of curve 1 correspondence.
Corresponding matching voltage is: UNI (), for the magnitude of voltage of curve 2 correspondence.
Following (the data in the case of following only consideration positive voltage and positive current of process of curve 2 are wherein obtained by curve 1
Reason, negative voltage is identical with processing method in the case of negative current):
Make Δ U1(i)=UT(i)-i*k
Wherein Δ U1I () is voltage compensation value corresponding during different size of current, it can be assumed that k is load resistance, electricity
It is exactly load terminal voltage that stream i is multiplied by resistance k, and therefore modulation voltage deducts load terminal voltage and is assumed that what converter itself lost
Voltage, this portion voltage namely needs the voltage compensated.
With the increase Δ U of electric current i in reality1I () can be gradually stable a value, the converter namely supposed itself damages
Dead electricity pressure has a limit value after increasing with electric current, and making this value is Δ U1。
So as Δ U1I () is at later big galvanic areas (after predetermined current), formula Δ U1(i)=UT(i)-i*k
Variable turn to:
ΔU1=UT(i)-i*k, it may be assumed that UT(i)=i*k+ Δ U1。
For distinguishing difference, redefine: UN(i)=i*k+ Δ U1
This formula homologous thread 2, Δ U1Value corresponding after curve becomes level in corresponding diagram 4.
Owing to wherein k is variable, and Δ U1It is again the variable relevant with k, it is not easy to calculate exact value, therefore intended by curve
Closing adjustment k value to make to be completely superposed with curve 2 at big galvanic areas curve 1, the purpose of this process is to confirm k value, can obtain simultaneously
Corresponding matched curve and corresponding offset and curve thereof, as shown in Figure 4.
This method is for current transformer dead band, tube voltage drop, control time delay and to carry out considered in including being supported on
Individual comprehensive compensation method.A compensation is carried out mainly for low frequency and extremely low frequency, obvious with extremely low frequency compensation effect at low frequency.
(medium-high frequency district is to need not dead area compensation), all offset datas are by testing current transformer and load together
Data process is also obtained by test.On-line sampling system during not Theoretical Calculation or current transformer run adds Theoretical Calculation,
Therefore it has singularity.This programme is to modulation voltage compensation, it is not necessary to ON time is accurately calculated and
Adjusting, algorithm easily realizes.
The Method And Principle of the present invention is simple, be not required to model accurately and theory analysis, calculating, it is not necessary to complicated algorithm, calculation
Method amount is the least, implementation is the strongest；Need not high precision electric current transducer, also without high-precision controller；Need not adjustment open
Close frequency and Dead Time, compensate not by increase and decrease ON time；Need not increase any measurement equipment；And compensate
Effect is obvious.
Below being only the preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment,
All technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that, for the art
For those of ordinary skill, some improvements and modifications without departing from the principles of the present invention, should be regarded as the protection of the present invention
Scope.
Claims (4)
1. a frequency converter dead-time compensation method, it is characterised in that comprise the following steps:
S01, output electric current previously according to converter, generate corresponding compensation magnitude of voltage；
Output electric current, during running, is monitored by S02, converter in real time, and right according to output size of current lookup
The compensation magnitude of voltage answered, to carry out voltage compensation to modulation voltage.
Frequency converter dead-time compensation method the most according to claim 1, it is characterised in that the detailed process of described step S01
For:
When S11, converter only export the most biphase phase voltage, ladder of phase voltage being started from scratch rises, and real time record is each
Output modulation voltage that ladder phase voltage is corresponding and actual current；Ladder of phase voltage being started from scratch declines, and real time record is each
Output modulation voltage that ladder phase voltage is corresponding and actual current；
S12, the data of record in step S11 are carried out curve fitting and obtain the curve of modulation voltage-actual current；
S13, curve to modulation voltage Yu actual current process the curve being compensated magnitude of voltage-actual current.
Frequency converter dead-time compensation method the most according to claim 2, it is characterised in that the detailed process of described step S13
For:
S131, curve by modulation voltage Yu actual current obtain the curve of matching voltage-actual current:
Make UT(i)=i*k+ Δ U1(i) (1)
Wherein UTI () is modulation voltage, Δ U1I () represents the compensation magnitude of voltage that different actual current is corresponding, k is load resistance；i
For actual current；
Make UN(i)=i*k+ Δ U1 (2)
Wherein UNI () is matching voltage, Δ U1For the compensation voltage stabilization value after predetermined current；
S132, by curve matching adjust k value make the curve of modulation voltage-actual current and the song of matching voltage-actual current
Line region after predetermined current is completely superposed, so that it is determined that k value, formula (1) is compensated magnitude of voltage-actual current
Curve.
4. according to the frequency converter dead-time compensation method described in Claims 2 or 3, it is characterised in that in step s 11, converter
Output connect the load of corresponding with actual loading equivalent resistance sense.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112737338A (en) * | 2020-12-10 | 2021-04-30 | 广州智光电气股份有限公司 | Voltage compensation method and voltage compensation device |
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| CN102082546A (en) * | 2009-11-27 | 2011-06-01 | 台达电子工业股份有限公司 | Device and method for pulse width modulation (PWM) dead-zone compensation of inverter |
| CN104578858A (en) * | 2015-01-15 | 2015-04-29 | 上海新时达电气股份有限公司 | Nonlinear compensation method for inverter |
| CN104811119A (en) * | 2015-04-24 | 2015-07-29 | 上海新时达电气股份有限公司 | Frequency converter dead-band compensation voltage self-learning method |
| CN104811079A (en) * | 2015-05-05 | 2015-07-29 | 上海新时达电气股份有限公司 | Dead-time compensation method and system of open-loop driver |
| CN105071734A (en) * | 2015-07-20 | 2015-11-18 | 台安科技(无锡)有限公司 | Control method for improving unsmoothness when motor current crosses zero point |
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2016
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102082546A (en) * | 2009-11-27 | 2011-06-01 | 台达电子工业股份有限公司 | Device and method for pulse width modulation (PWM) dead-zone compensation of inverter |
| CN104578858A (en) * | 2015-01-15 | 2015-04-29 | 上海新时达电气股份有限公司 | Nonlinear compensation method for inverter |
| CN104811119A (en) * | 2015-04-24 | 2015-07-29 | 上海新时达电气股份有限公司 | Frequency converter dead-band compensation voltage self-learning method |
| CN104811079A (en) * | 2015-05-05 | 2015-07-29 | 上海新时达电气股份有限公司 | Dead-time compensation method and system of open-loop driver |
| CN105071734A (en) * | 2015-07-20 | 2015-11-18 | 台安科技(无锡)有限公司 | Control method for improving unsmoothness when motor current crosses zero point |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112737338A (en) * | 2020-12-10 | 2021-04-30 | 广州智光电气股份有限公司 | Voltage compensation method and voltage compensation device |
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