CN110417333A - A kind of half primitive period of switching frequency segmentation random space vector pulse duration modulation method - Google Patents
A kind of half primitive period of switching frequency segmentation random space vector pulse duration modulation method Download PDFInfo
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- CN110417333A CN110417333A CN201910693974.5A CN201910693974A CN110417333A CN 110417333 A CN110417333 A CN 110417333A CN 201910693974 A CN201910693974 A CN 201910693974A CN 110417333 A CN110417333 A CN 110417333A
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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
- H02P27/085—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 wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency
Abstract
The invention discloses a kind of half primitive periods of switching frequency to be segmented random space vector pulse duration modulation method.The entire primitive period is split as former and later two half primitive periods by the novel randomized modulation, by way of introducing deviation frequency and random frequency, and both reasonable distributions size, switching frequency in the single primitive period be segmented random, to optimize switching frequency distribution, higher hamonic wave amplitude is further cut down.Method disclosed by the invention can further weaken harmonic wave near switching frequency and its integral multiple in relatively narrow switching frequency variation range, realize that higher hamonic wave is more preferably dispersed, and then the electromagnetic interference of inverter can be effectively reduced, facilitate the application and popularization of randomized modulation.
Description
Technical field
The invention discloses a kind of half primitive periods of switching frequency to be segmented random space vector pulse duration modulation method, belongs to
Technical field.
Background technique
In recent years, various advanced electrical with the fast development in the fields such as new-energy automobile, aerospace, ships propulsion
Equipment largely uses, Traditional Space Vector Pulse Width Modulation (SVPWM, Space Vector Pulse Width Modulation)
Technology bring defect is increasingly focused on, especially an Electro Magnetic Compatibility weight having become electrified field of traffic
Want inspection target.When using traditional SVPWM, output voltage generates a large amount of higher hamonic waves at switching frequency and its integral multiple, from
And a large amount of electromagnetic noises and interference are brought, influence system EMC.
Random SVPWM technology directly generates driving letter by changing switching signal period, the parameters such as pulse position at random
Number, electromagnetic interference source is controlled from source, system topology can not changed, does not increase and realizes high order under conditions of hardware cost
Harmonic wave fine dispersion in wider frequency range improves the Electro Magnetic Compatibility of system to effectively reduce electromagnetic interference.Just because of
In this way, it has received widespread attention and furthers investigate in recent years.
According to the difference for being randomized object in randomized modulation, Randomized Pulse Position modulation technique can be divided into and opened at random
Close two class of frequency modulating technology.Wherein Randomized Pulse Position modulation technique dispersion high-order harmonic ability is to be improved, and opens at random
Frequency modulating technology is closed because its good harmonic dispersion effect has obtained more extensive research.
In general, the maxima and minima of randomized switching frequency is symmetrical in the two sides of average frequency of switching, the upper limit
Then limited by switching device；If switching frequency variation range is wider, lower limit also can very little, and then current ripples is caused to increase,
Influence systematic steady state performance.Simultaneously wider switching frequency range can also bring " spectral aliasing " phenomenon so that switching frequency with
Higher hamonic wave is superimposed between twice of switching frequency, increases electromagnetic interference.In addition, being adjusted at random using digital control technology realization
When processed, usual sample frequency is consistent with switching frequency.And in randomized switching frequency modulation system, sample frequency also can be same
Step variation, if its variation range is larger, ssystem transfer function also can substantially change therewith with frequency domain characteristic, adjust accordingly device ginseng
Several designs will also consider that sample frequency variation influences.The actual effect that these above-mentioned factors can make randomized switching frequency modulate
It has a greatly reduced quality, also increases its engineer application difficulty.
Currently, about randomized switching frequency modulation research mostly be carried out in wider switching frequency range, but
In practical application, the software and hardware limitations of motor driven systems can limit switch frequency range to a certain extent, in turn
The higher hamonic wave dispersion effect for causing Stochastic Modulation to generate is bad, and application is also accordingly limited.
For this problem, the invention proposes a kind of half primitive periods of switching frequency to be segmented random space vector pulsewidth tune
Method processed, the technology can in the case where switching frequency variation range is relatively narrow, further decrease concentrate on switching frequency and its
Higher hamonic wave amplitude near integral multiple, preferably to inhibit electromagnetic noise and interference.
Summary of the invention
Goal of the invention of the invention is the deficiency for above-mentioned background technique, provides a kind of half primitive period of switching frequency
It is segmented random space vector pulse duration modulation method, the full primitive period randomized switching frequency modulator approach of tradition is improved, point
The other switching frequency independent random to two and half primitive periods, solve conventional modulated method switching frequency variation range compared with
The larger technical problem of higher hamonic wave amplitude in the case where narrow.
The present invention adopts the following technical scheme that for achieving the above object
A kind of half primitive period of switching frequency segmentation random space vector pulse duration modulation method, including following several steps:
1. firstly, being divided according to β shaft voltage vector under rest frame to the primitive period；
2. then, determining the sign bit of deviation frequency according to two and half primitive periods marked off；
3. the random frequency of next switch periods then, is calculated according to random number and deviation frequency order of magnitude
Rate；
4. then, by deviation frequency, deviation frequency sign bit, random frequency and entire primitive period average frequency of switching knot
Conjunction obtains the switching frequency of next switch periods；
5. finally, the action time of relevant voltage vector is calculated according to SVPWM algorithm and determines each switching signal.
Further, in a kind of half primitive period of switching frequency segmentation random space vector pulse duration modulation method, step 1
Method particularly includes: the β shaft voltage vector U obtained according to coordinate transformβSize the voltage fundamental period is divided into two parts, this
The voltage fundamental period is divided into U by inventionβ≤ 0 and Uβ> 0 two halves primitive period.
Further, in a kind of half primitive period of switching frequency segmentation random space vector pulse duration modulation method, step 2
Method particularly includes: define deviation frequency Δ foffsFor average frequency of switching f in half primitive periodahIt is put down in the entire primitive period
Equal switching frequency fafAbsolute value of the difference, i.e. Δ foffs=| fah-faf|.It is determined according to two and half primitive periods marked off inclined
Shift frequency rate Δ foffsSign bit signb.The present invention uses UβWhen≤0, deviation frequency sign bit signb is -1, UβWhen > 0, partially
Shift frequency rate sign bit signb is 1.
Further, in a kind of half primitive period of switching frequency segmentation random space vector pulse duration modulation method, step 3
Method particularly includes: define random frequency range delta f in half primitive periodrangeFor entire primitive period switching frequency variation range
The half of Δ f with deviation frequency Δ foffsDifference, i.e. Δ frange=Δ f/2- Δ foffs.It is calculated using linear congruential method
16 tape symbol random number Rs of next switch periods, and the random frequency Δ f of next switch periods is calculatedrand, calculation formula
For Δ frand=[Δ frange·R/215], wherein [x] is x rounding.
Further, in a kind of half primitive period of switching frequency segmentation random space vector pulse duration modulation method, step 4
Method particularly includes: by deviation frequency Δ foffs, deviation frequency sign bit signb, random frequency Δ frandWith the entire primitive period
Average frequency of switching fafIn conjunction with obtaining the switching frequency f of next switch periodsnext, calculation formula fnext=faf+Δfoffs·
signb+Δfrand。
Further, in a kind of half primitive period of switching frequency segmentation random space vector pulse duration modulation method, step 5
Method particularly includes: according to the switching frequency f of next switch periodsnext, and relevant voltage arrow is calculated according to SVPWM principle
The action time of amount simultaneously determines each switch actuating signals.
The present invention by adopting the above technical scheme, has the advantages that
(1) generated at random in the random frequency range according to determined by half period frequency shift (FS) next switch periods with
Unit frequency, when generating next switch periods switching frequency meter and half wave cycles bias internal frequency and next switch periods with
Unit frequency can reduce the height concentrated near switching frequency and its integral multiple in the case where switching frequency variation range is relatively narrow
Subharmonic amplitude.
(2) present invention generates random number using linear congruential method, and without increasing additional hardware, it is convenient to realize.
(3) technology disclosed by the invention is a kind of general technology, is suitable for three-phase and polyphase machine drive system.
Detailed description of the invention
Fig. 1 is to be segmented half primitive period of switching frequency random space vector pulse modulation technology to realize schematic diagram.
Fig. 2 is three-phase inverter basic voltage vectors distribution map.
Fig. 3 is half primitive period of switching frequency to be segmented random space vector pwm switch signal.
Fig. 4 is higher hamonic wave distribution character under presently disclosed technology.
Specific embodiment
The technical solution of invention is described in detail with reference to the accompanying drawing.
Half primitive period of switching frequency is segmented random space vector pulse modulation technology and realizes schematic diagram as shown in Figure 1, head
First the primitive period is divided according to the voltage vector that coordinate transform obtains；Then according to two and half primitive periods marked off
Determine the sign bit signb of deviation frequency；Then pseudo random number R is generated using linear congruential method.
The recurrence formula of linear congruential method is:
Rj+1≡(A×Rj+ B) (congruence M) (j=0,1,2....) (1),
Wherein, RjFor j moment value, Rj+1For j+1 moment value, A, B, M are the parameters that designer voluntarily selects, what the present invention used
Initial value is A=97, B=59, M=32768.
Then according to random number R and deviation frequency order of magnitude Δ foffsThe random frequency of current switch period is calculated
Rate Δ frand, calculation formula is Δ frand=[Δ frange·R/215]；Then by deviation frequency Δ foffs, deviation frequency sign bit
Signb, random frequency Δ foffsWith entire primitive period average frequency of switching fafIn conjunction with obtain next switch periods switch frequency
Rate fnext, calculation formula fnext=faf+Δfoffs·signb+Δfrand；It is last that corresponding electricity is calculated according to SVPWM algorithm
It presses the action time of vector and determines each switching signal.
Three bridge arms of three-phase inverter share 6 switching tubes, may all combine and share eight kinds, including 6 non-null vectors
Measure U1(001)、U2(010)、U3(011)、U4(100)、U5(101)、U6(110) and two zero vector U0(000)、U7(111), it
Be distributed in α β coordinate system it is as shown in Figure 2.If exporting a reference space voltage vector U needed at presentrefIn I sector, then
It can be indicated with two space vector of voltage adjacent with it:
In formula, θ is reference space voltage vector and α axle clamp angle, TzFor switch periods, i.e. Tz=1/fnext。T6, T4Respectively
Voltage vector U6With U4Action time.
The time that zero vector is distributed are as follows:
T0=T7=(Tz-T4-T6)/2 (3),
Mean allocation is carried out in time to two class zero vectors by above formula, to generate symmetrical pwm signal, finally
The switching signal of randomized modulation disclosed in this invention is obtained, as shown in Figure 3.
Higher hamonic wave distribution character is as shown in Figure 4 under presently disclosed technology.Wherein entire primitive period switching frequency
Variation range is 2 Δ f, deviation frequency Δ foffsRefer to average frequency of switching in half primitive period and is averaged in the entire primitive period
The difference of switching frequency, random frequency Δ frandFor the half of switching frequency variation range in half primitive period.In traditional full base
In the modulation of wave period randomized switching frequency, deviation frequency 0, random frequency is 2 Δ f.To make switching loss and switching frequency
Variation range remains unchanged, and the deviation frequency absolute value of two and half primitive periods is Δ foffs.Using disclosed in this invention
After technology, originally the randomisation process of a primitive period switching frequency was divided into two parts.In preceding half of primitive period, often
The envelope for the higher hamonic wave that a switch periods generate is the chain-dotted line in left side, average frequency of switching fs-Δfoffs, variation
Range is [fs-Δfoffs-Δfrand,fs-Δfoffs+Δfrand]；In the height that rear half of primitive period, each switch periods generate
The envelope of subharmonic is the fine line on right side, average frequency of switching fs+Δfoffs, variation range is [fs+Δfoffs-Δ
frand,fs+Δfoffs+Δfrand], it is seen then that feelings that can be relatively narrow in switching frequency variation range using disclosed method
The higher hamonic wave amplitude concentrated near switching frequency and its integral multiple is reduced under condition.
Claims (7)
1. a kind of half primitive period of switching frequency is segmented random space vector pulse duration modulation method, which is characterized in that according to static
The voltage fundamental period is divided into two half wave cycles by the zero passage situation of voltage vector component under coordinate system, according to two marked off
A half primitive period determines the sign bit of half wave cycles bias internal frequency, in half wave cycles bias internal frequency and entire primitive period
Next switch periods are generated in random frequency range in half primitive period determined by the difference of switching frequency variation range
Random frequency, meter and half wave cycles bias internal frequency and next switch on the basis of entire primitive period average frequency of switching
The random frequency in period obtains the switching frequency of next switch periods, and relevant voltage vector is calculated according to SVPWM algorithm
Action time simultaneously determines each switch in the signal of next switch periods.
2. a kind of half primitive period of switching frequency is segmented random space vector pulse duration modulation method according to claim 1,
It is characterized in that, the voltage fundamental period is divided by two half-wave weeks according to the zero passage situation of voltage vector component under rest frame
The method of phase are as follows: the voltage fundamental period is divided into Uβ≤ 0 and Uβ> 0 two and half primitive period, UβFor β shaft voltage vector.
3. a kind of half primitive period of switching frequency is segmented random space vector pulse duration modulation method according to claim 1,
It is characterized in that, the half wave cycles bias internal frequency is average frequency of switching f in half primitive periodahIt is put down in the entire primitive period
Equal switching frequency fafAbsolute value of the difference, Δ foffs=| fah-faf|, Δ foffsFor half wave cycles bias internal frequency.
4. a kind of half primitive period of switching frequency is segmented random space vector pulse duration modulation method according to claim 1,
It is characterized in that, the method for the sign bit of half wave cycles bias internal frequency is determined according to two and half primitive periods marked off are as follows: Uβ
When≤0, the sign bit signb of half wave cycles bias internal frequency is -1；UβWhen > 0, the sign bit of half wave cycles bias internal frequency
Signb is 1.
5. a kind of half primitive period of switching frequency is segmented random space vector pulse duration modulation method according to claim 1,
It is characterized in that, random frequency range is according to expression formula in half primitive period: Δ frange=Δ f/2- Δ foffsIt determines, Δ
frangeFor random frequency range in half primitive period, Δ f is entire primitive period switching frequency variation range, Δ foffsFor half-wave
Period bias internal frequency.
6. a kind of half primitive period of switching frequency is segmented random space vector pulse duration modulation method according to claim 1,
Be characterized in that, using linear congruential method half wave cycles bias internal frequency and entire primitive period switching frequency variation range difference
The random frequency of next switch periods is generated in random frequency range in identified half primitive period.
7. a kind of half primitive period of switching frequency is segmented random space vector pulse duration modulation method according to claim 1,
It is characterized in that, the switching frequency of next switch periods is according to expression formula: fnext=faf+Δfoffs·signb+ΔfrandIt determines,
fnextFor the switching frequency of next switch periods, fafFor average frequency of switching in the entire primitive period, Δ foffsFor half fundamental wave week
Phase bias internal frequency, signb are the sign bit of half primitive period bias internal frequency, Δ frandFor the random frequency of next switch periods
Rate.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112910347A (en) * | 2021-01-21 | 2021-06-04 | 西安理工大学 | Dual-random SVPWM harmonic suppression method based on Meisen rotation algorithm |
| CN113541521A (en) * | 2021-07-06 | 2021-10-22 | 辽宁工程技术大学 | Hysteresis loop random frequency spreading method in inverter random pulse width modulation selective harmonic elimination |
| CN114001448A (en) * | 2021-10-18 | 2022-02-01 | 广东美芝制冷设备有限公司 | Control method and device of air conditioner |
| GB2623136A (en) * | 2022-11-14 | 2024-04-10 | Mclaren Applied Ltd | Variable switching frequency |
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| CN109510445A (en) * | 2018-10-31 | 2019-03-22 | 华中科技大学 | A kind of inverter change switching frequency modulation method considering inductance saturated characteristic |
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| JPH05344740A (en) * | 1992-06-09 | 1993-12-24 | Toshiba Corp | Inverter unit |
| CN1841893A (en) * | 2005-03-30 | 2006-10-04 | 昂宝电子（上海）有限公司 | System and method for controlling switch frequency change in power supply transducer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112910347A (en) * | 2021-01-21 | 2021-06-04 | 西安理工大学 | Dual-random SVPWM harmonic suppression method based on Meisen rotation algorithm |
| CN113541521A (en) * | 2021-07-06 | 2021-10-22 | 辽宁工程技术大学 | Hysteresis loop random frequency spreading method in inverter random pulse width modulation selective harmonic elimination |
| CN113541521B (en) * | 2021-07-06 | 2022-07-29 | 辽宁工程技术大学 | Hysteresis loop random frequency spreading method in inverter random pulse width modulation selective harmonic elimination |
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| GB2623136A (en) * | 2022-11-14 | 2024-04-10 | Mclaren Applied Ltd | Variable switching frequency |
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