CN106464154B - Inverter and use its drive system - Google Patents
Inverter and use its drive system Download PDFInfo
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- CN106464154B CN106464154B CN201580024284.0A CN201580024284A CN106464154B CN 106464154 B CN106464154 B CN 106464154B CN 201580024284 A CN201580024284 A CN 201580024284A CN 106464154 B CN106464154 B CN 106464154B
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
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Abstract
The present invention relates to inverter and its drive system is used, more particularly to reduces the technology of the higher hamonic wave loss of ac motor.Moreover, the project of the present invention is the pulse mode realized for keeping the minimum that the higher hamonic wave of ac motor is lost lasting.In order to realize that the above subject, the present invention are a kind of inverters being converted into exchange to direct current progress switch motion, it is characterised in that：Switch the 1st pulse mode and the 2nd pulse mode based on the index of modulation, 0~180 degree of voltage-phase, 180~360 degree of the umber of pulse of 1st pulse mode are respectively n, (n 1), 0~180 degree of voltage-phase, 180~360 degree of the umber of pulse of 2nd pulse mode are respectively (n 1), n, wherein, n is integer, and the umber of pulse in each period is (2n 1).In accordance with the invention it is possible to make the higher hamonic wave minimization of loss of ac motor.Thereby, it is possible to obtain preventing the miniaturization and other effects of the deterioration of material property, cooling system.
Description
Technical field
The present invention relates to inverter and its drive system is used, more particularly to reduces the higher hamonic wave damage of ac motor
The technology of mistake.
Background technology
In order to efficiently drive ac motor, the variable speed drive using inverter is effective.Inverter includes opening
Element is closed, the alternating voltage of optional frequency can be applied to ac motor.But it will produce voltage, electricity because of switch motion
The reason of flowing higher hamonic wave, becoming higher hamonic wave loss (magnetic hysteresis loss (Hysteresis loss), eddy current losses etc.).This
Not only efficiency is made to reduce, but also the material property of magnet, electromagnetic steel plate etc. can be made to deteriorate because of heat.Therefore, it is necessary to suitably control
The switch of inverter processed reduces higher hamonic wave loss.
In (patent document 1), switch the umber of pulse of the switch of inverter according to the index of modulation.Here, umber of pulse is exchange
In 1 period of motor, the quantity of the voltage pulse of inverter output.By the adjusting of umber of pulse, voltage high order can be inhibited
Harmonic wave reduces higher hamonic wave loss.
In (patent document 2), so that value obtained by higher hamonic wave loss divided by fundamental wave electric power is that least way provides arteries and veins
Rush phase.Impulse phase be voltage pulse be ON or OFF when voltage-phase.When impulse phase is determined, voltage high order is humorous
Wave is also determined, and then can approximatively seek higher hamonic wave loss.It is most suitable for impulse phase in a manner of minimizing it.
The problem of (patent document 1), is, in the case where that can not change umber of pulse, cannot reduce higher hamonic wave damage
It loses.Umber of pulse is dependent on the characteristic of the switch element of inverter or the rotary speed of ac motor, so may not be able to
Arbitrary change.In (patent document 2), even if umber of pulse is identical, higher hamonic wave damage is reduced also by making impulse phase be most suitable for
It loses.But impulse phase it is most suitable when, higher hamonic wave loss minimization be possible to stop, may not be able to minimizing.
In order to make higher hamonic wave minimization of loss, need to make impulse phase be most suitable for by each pulse mode of inverter
Change, and the pulse mode after most suitableization is compared each other.Pulse mode is matching for the corresponding voltage pulse of voltage-phase
Placing graphic pattern.Identical umber of pulse (2n-1, n：Integer) in, pulse mode is divided into 2 classes.1st pulse mode, voltage-phase 0
The umber of pulse of~180 degree is：n；Voltage-phase is that 180~360 degree of umber of pulse is：(n-1).2nd pulse mode, voltage-phase
It is for the umber of pulse of 0~180 degree：(n-1)；Voltage-phase is that 180~360 degree of umber of pulse is：n.Whole pulse mode quilts
It is divided into one of the 1st pulse mode, the 2nd pulse mode.Therefore, if making the 1st pulse mode, the 2nd pulse mode respectively most
Suitableization, and then smaller pulse mode is lost in selection after optimization, it will be able to make higher hamonic wave minimization of loss.
Existing technical literature
Patent document
Patent document 1：Japanese Unexamined Patent Publication 2011-223772 bulletins
Patent document 2：Japanese Unexamined Patent Publication 2012-120250 bulletins
Non-patent literature
Non-patent literature 1：The Institution of Electrical Engineers：Motor controls engineering, Ohmsha, pp.132-152 (2007)
Invention content
The subject that the invention solves
The present invention relates to inverter and its drive system is used, especially realizes the high order for reducing ac motor
The pulse mode of harmonic losses controls.
The method used for solving the problem
In order to realize that the direct current being converted to the inverse of exchange by the above subject, the present invention to be a kind of to direct current progress switch motion
Become device, it is characterised in that：Switch the 1st pulse mode and the 2nd pulse mode, the electricity of the 1st pulse mode based on the index of modulation
Pressure phase 0~180 degree, 180~360 degree of umber of pulse are respectively n, (n-1), and the voltage-phase 0 of the 2nd pulse mode~
180 degree, 180~360 degree of umber of pulse are respectively (n-1), n, wherein n is integer, and the umber of pulse in each period is (2n-
1)。
Also, the inverter of the present invention is characterized in that：Fundamental frequency based on inverter changes above-mentioned umber of pulse.
Also, the inverter of the present invention is characterized in that：Switch the 1st pulse mode and the 2nd pulse mode with
So that the higher hamonic wave of (formula 3) is lost Wh and minimizes (wherein, An：N times voltage higher hamonic wave, n：Overtone order, λ：Loss coefficient (0
≤λ≤2))。
Also, the inverter of the present invention is characterized in that：When the index of modulation be timing, be switched to the 1st pulse
Pattern is switched to the 2nd pulse mode when the index of modulation is negative.
Also, the inverter of the present invention is characterized in that：Mode switches the described 1st at least one of as follows
Pulse mode and the 2nd pulse mode, i.e.,：
(1) n is odd number and when the index of modulation is specified value or more, is switched to the 1st pulse mode；
(2) n is odd number and when the index of modulation is specified value or less, is switched to the 2nd pulse mode；
(3) n is even number and when the index of modulation is specified value or more, is switched to the 2nd pulse mode；With
(4) n is even number and when the index of modulation is specified value or less, is switched to the 1st pulse mode.
Also, the inverter of the present invention is characterized in that：In the case where the umber of pulse is specified value or more, stop institute
State the switching of pulse mode.
Also, the inverter of the present invention is characterized in that：Carrier wave is set to invert based on the index of modulation.
In addition, the drive system of the present invention is characterized in that：Using the inverter control of the present invention as drive system
The ac motor of driving source.
Invention effect
In accordance with the invention it is possible to make the higher hamonic wave minimization of loss of ac motor.Thereby, it is possible to obtain preventing material
The effect of the deterioration of characteristic, the miniaturization of cooling system etc..
Description of the drawings
Fig. 1 is the structure chart of the inverter of embodiment 1.
Fig. 2 is the polar plot of voltage, electric current.
Fig. 3 is the pulse mode of umber of pulse 3.
Fig. 4 is the pulse mode of umber of pulse 5.
Fig. 5 is the pulse mode of umber of pulse n.
Fig. 6 is the index of modulation of umber of pulse 3 and the relational graph of impulse phase.
Fig. 7 is the relational graph of the index of modulation and higher hamonic wave loss of umber of pulse 3.
Fig. 8 is the index of modulation of umber of pulse 5 and the relational graph of impulse phase.
Fig. 9 is the relational graph of the index of modulation and higher hamonic wave loss of umber of pulse 5.
Figure 10 is umber of pulse 3, the pulse mode near the index of modulation 0%.
Figure 11 is umber of pulse 3, the pulse mode near the index of modulation+100%.
Figure 12 is the structure chart of the inverter of embodiment 2.
An example of movement oscillogram when Figure 13 is the selection of the 1st carrier wave.
An example of movement oscillogram when Figure 14 is the selection of the 2nd carrier wave.
Figure 15 is the structure chart using the drive system of the inverter of embodiment 3.
Specific implementation mode
In the following, being illustrated to various embodiments of the present invention with attached drawing.
(embodiment 1)
Embodiment 1 is illustrated with Fig. 1~Figure 11.
Fig. 1 is the structure chart of the inverter of embodiment 1.
Ac motor 1 is applied in three-phase alternating voltage (U phase voltage Vu, V phase voltage Vv, W phase voltages by inverter 2
Vw), flowing three-phase alternating current (U phase current Iu, V phase current Iv, W phase current Iw) generates motor torque.Wherein, it exchanges
Motor 1 is assumed to three-phase and illustrates, but other than three-phase in the case of it is also the same.
The quantity of state of ac motor 1 is illustrated.Fig. 2 is the polar plot of voltage, electric current.U axis indicates AC electrical
The flow direction that the U phase coils of machine 1 generate.V axis and W axis are also the same.S axis is the axis for making U axis counterclockwise be rotated by 90 °.d
Axis indicates that the rotary shaft of ac motor 1, phase are the θ on the basis of S axis.In addition, the rotary speed of d axis, i.e. alternating current
The rotary speed of motivation 1 is ω.Motor voltage V1 is the resultant vector of three-phase alternating voltage, and voltage-phase is to be with S axis
The θ v of benchmark.
Inverter 2 is converted into three-phase alternating voltage by carrying out switch motion to DC voltage VDC, is output to exchange
Motor 1.
Current detecting unit 3 detects three-phase alternating current, is output to inverter control unit 5.
Position-speed detection unit 4 detects the rotor phase θ and rotary speed ω of ac motor 1, is output to inverter
Control unit 5.
Inverter control unit 5 is based on three-phase alternating current, rotor phase θ, rotary speed ω, speed command ω*, by grid
Pole signal Guvw is output to inverter 2.The switch of inverter 2 is by control (PWM is controlled), the rotation speed of ac motor 1 as a result,
Degree ω converges on speed command ω*.Rotational speed command ω*Torque instruction or current-order etc. can also be replaced into.
The inscape of inverter control unit 5 be output voltage computing unit 51, the 1st pulse mode computing unit 52,
2nd pulse mode computing unit 53, pulse mode switch unit 54, grid signal computing unit 55, umber of pulse computing unit 56.
Each integral part is illustrated below.
Export computing unit 51 be based on three-phase alternating current, rotor phase θ, rotary speed ω, calculate voltage-phase θ v and
Index of modulation Kh.Such as it is calculated with following step.
(1) according to the vector controlled of non-patent literature 1, motor voltage V1 and voltage-phase θ v is calculated.
(2) by the way that motor voltage V1 divided by DC voltage VDC are exported index of modulation Kh.
After above-mentioned calculating, voltage-phase θ v are output to grid signal computing unit 55.In addition, index of modulation Kh is exported
To the 1st pulse mode computing unit 52, the 2nd pulse mode computing unit 53.
1st pulse mode computing unit 52, the 2nd pulse mode computing unit 53 are based on index of modulation Kh and umber of pulse Pno
The 1st pulse mode P1, the 2nd pulse mode P2 are exported respectively.This is for example by the way that storage table is realized in memory in advance.Pulse
Number Pno is the sum of the voltage pulse in each period of ac motor, is odd number " Pno=according to aftermentioned odd symmetry
2n-1(n：Integer) ".In addition, pulse mode is the configuration pattern of voltage pulse corresponding with voltage-phase θ v.Whole pulses
Pattern is divided into the 1st pulse mode, the 2nd pulse mode, and definition is as shown in table 1.This definition is based on according to aftermentioned odd symmetry
Property there is no across 0 degree or 180 degree pulse mode.
[table 1]
| The umber of pulse of 0 degree≤θ v≤180 degree | The umber of pulse of 180 degree≤v≤360 degree θ | |
| 1st pulse mode | n | n-1 |
| 2nd pulse mode | n-1 | n |
Fig. 3 indicates that pulse mode when umber of pulse 3, Fig. 4 indicate pulse mode when umber of pulse 5.The a1 of Fig. 3, Fig. 4,
A2 ... an indicates the number of voltage pulse.Impulse phase α 1, α 2 ... α m (m：Integer) be voltage pulse be ON or OFF
When voltage-phase θ v.Pulse mode is generally set to meet (formula 1) and (formula 2).
[formula 1]
F (ω t)=f (π-ω t) (formula 1)
[formula 2]
F (ω t)=f (π+ω t) (formula 2)
(formula 1) indicates odd symmetry, has the phase for the higher hamonic wave that will include in pulse mode to be unified for zero effect.Separately
Outside, (formula 2) indicates half-wave symmetry, there is the effect for making the amplitude of even harmonic be zero.According to their symmetry, pulse
Pattern is defined as only between 0~90 degree.Therefore, if only determining impulse phase α 1, Fig. 4 institutes in umber of pulse shown in Fig. 33
Impulse phase α 1, α 2 are only determined in the umber of pulse 5 shown, pulse mode just is prescribed.In general, umber of pulse " Pno=
In 2n-1 ", pulse mode is provided by (n-1) a impulse phase.
Pulse mode when Fig. 5 is indicated umber of pulse Pno generalization.According to Fig. 5, it is known that the following contents.
In (1) the 1st pulse mode P1, there is the pulse to connect with the inside (direction for including 90 degree) of 0 degree, 180 degree.
It is odd number " n=2p-1 (p in the n of umber of pulse " Pno=2n-1 " in (2) the 1st pulse mode P1：Integer) " feelings
Under condition, there is the pulse for including 90 degree.It is even number " n=2p (p in n：Integer) " in the case of, the pulse across 90 degree is not present.
The property of (3) the 2nd pulse mode P2 is opposite with the 1st pulse mode P1.
(4) when switch pulse pattern P1, P2, pulse mode (figure) discontinuously changes (cannot continuously change).
Pulse mode switch unit 54 is based on index of modulation Kh or umber of pulse Pno switches the 1st pulse mode P1, the 2nd pulse
Pattern P2.Selected pulse mode Px is output to grid signal computing unit 55.
Grid signal computing unit 55 is based on voltage-phase θ v and strobe pulse pattern Px calculates grid signal Guvw.Such as
It it is 90 degree and the 1st pulse mode P1 selected in voltage-phase θ v, grid signal is as shown in the point Q of Fig. 3
OFF.Three-phase calculating is carried out to it, grid signal Guvw is output to inverter 2.
The material property (illustration omitted) etc. of fundamental frequency or switch element of the umber of pulse computing unit 56 based on inverter 2, meter
Calculate umber of pulse Pno.The fundamental frequency of inverter 2 can also be substituted with the rotary speed ω of ac motor 1 (because if exchange
Motor 1 is synchronous machine, then they are consistent).By the adjusting of umber of pulse Pno, can make inverter 2 switching losses and
The distribution of the higher hamonic wave loss of ac motor 1 is most suitable for.Umber of pulse Pno is output to the 1st pulse mode 52, the 2nd pulse
Pattern 53, pulse mode switch unit 54.
According to the above, switch pulse pattern P1, P2 controls inverter 2 by selected pulse mode Px in addition,
Thus ac motor 1 is driven.
It is illustrated to the higher hamonic wave of ac motor 1 can be made to lose the reasons why Wh is minimized according to the present invention.
Higher hamonic wave loss Wh is the summation by the electric current higher hamonic wave In magnetic hysteresis loss generated or eddy current losses etc., is used
(formula 3) indicates.
[formula 3]
Wherein, An：Voltage higher hamonic wave, n：Higher hamonic wave number, λ：Loss coefficient
Voltage higher hamonic wave An is the higher hamonic wave that pulse mode is included, by pulse mode carry out fft analysis come
It seeks.Loss coefficient λ indicates the frequency dependence of higher hamonic wave loss Wh, is 0 or more 2 coefficient below.According to higher hamonic wave
The main reason for loss, determines as follows.
(1) λ=0：There is no the case where frequency dependence, copper loss is main
(2) λ=1：The case where magnetic hysteresis loss is main
(3) λ=2：The case where eddy current losses are main
Following presentation makes the higher hamonic wave minimization of loss of (formula 3) by the switching of pulse mode P1, P2.
Fig. 6 is the relational graph of the index of modulation Kh and impulse phase α 1 of umber of pulse 3.In umber of pulse 3, the design of pulse mode
Degree of freedom is only impulse phase α 1.Therefore, impulse phase α 1 is uniquely determined according to index of modulation Kh.It understands for example in selection the 1st
In the case of pulse mode P1, index of modulation Kh more increases, impulse phase α 1 more asymptotic 90 degree (upper figure of Fig. 6).This means that
In Fig. 3, the width of voltage pulse a1 increases.Conversely, index of modulation Kh is more reduced, and 1 more asymptotic 0 degree of impulse phase α, the electricity of Fig. 3
The width of pulse a1 is pressed to reduce.Case above is also the same about the 2nd pulse mode.
Fig. 7 is the relational graph of the index of modulation Kh and higher hamonic wave loss Wh of umber of pulse 3.Higher hamonic wave lose Wh according to
(formula 3) is sought, and loss coefficient λ is assumed to zero.In addition, higher hamonic wave loses Wh with the index of modulation 100% (when 1 pulsed drive)
Higher hamonic wave loss is standardized (unit for 1：p.u.).Section M1, M2 of Fig. 7 indicates that the high order of pulse mode P1, P2 are humorous
Wave loses the sections smaller than another party Wh.Therefore, it is able to make by being switched to pulse mode P1, P2 in M1, the M2 of section
Higher hamonic wave minimization of loss.For example, the index of modulation 60% is included in the M1 of section, strobe pulse pattern P1.At this point, with selection
The case where P2, is compared, and can higher hamonic wave be lost Wh and reduce 2.7p.u..Pulse mode P2, section are not applied in the M1 of section
Pulse mode P1 is not applied in M2.Their pulse mode is not applied, is the grey parts of Fig. 6.
As shown in fig. 6, in umber of pulse 3, impulse phase α 1 is uniquely determined according to index of modulation Kh, so not by pulsion phase
The degree of freedom of position 1 most suitableization of α.Therefore, with cannot be by higher hamonic wave minimization of loss by the method for impulse phase most suitableization.
In the present invention, by using 54 switch pulse pattern of pulse mode switch unit itself, higher hamonic wave minimization of loss can be made.
Fig. 8 is the relational graph of the index of modulation Kh and higher hamonic wave loss Wh of umber of pulse 5.In umber of pulse 5, pulse mode
Design freedom be impulse phase α 1, α 2 the two.Therefore, impulse phase α 1, α 2 are not uniquely determined by index of modulation Kh, so
Have the degree of freedom of impulse phase most suitableization.Although not shown, more than 7 pulses also the same, umber of pulse more increases, most suitable
The degree of freedom of combination also increases.Impulse phase shown in Fig. 8 is come in a manner of minimizing the higher hamonic wave of (formula 3) loss Wh
The result of most suitableization.
Fig. 9 is the relational graph of the index of modulation Kh and higher hamonic wave loss Wh of umber of pulse 5.It understands and pulse shown in Fig. 7
Several 3 the case where, equally can make higher hamonic wave minimization of loss by switch pulse pattern P1, P2.Pulse mode P1, P2 are
Through completing most suitableization, in respective pulse mode, higher hamonic wave loss is by minimization.But in order to make higher hamonic wave lose
It minimizes, needs they being compared, be switched over using pulse mode switch unit 54.
In the case of 5 or more umber of pulse, only makes impulse phase most suitableization that cannot make higher hamonic wave minimization of loss, be
Because caused by the discontinuity of pulse mode P1, P2.As can be seen from FIG. 5, do not change umber of pulse, cannot make pulse mode P1,
P2 continuously changes.That is, pulse mode P1, P2 (criterion) cannot need respectively most suitable being most suitable in a like fashion
With change and the two is compared.Currently invention addresses this point, are provided with pulse mode switch unit 54.
According to the above, the higher hamonic wave of ac motor 1 can be made to lose Wh and minimized.It is added below
It is bright.
The switching of pulse mode P1, P2 do not need to whole implementations, can also omit a part.For example, can be with modulation
Coefficient 0% is that boundary switches over.
(1) index of modulation Kh ＞ 0：1st pulse mode P1
(2) index of modulation Kh ＜ 0：2nd pulse mode P2
The boundary value of section M1, M2 in order to obtain needs to solve the problems, such as most suitableization with (formula 3) is object function.But
It is that the case where the index of modulation 0% needs to switch over, can be illustrated according to the symmetry of pulse mode, not needed to most
The calculating of suitableization.The reasons why the 1st pulse mode P1 of selection, illustrates when below to modulation COEFFICIENT K h ＞ 0.
Figure 10 is umber of pulse 3, the pulse mode near the index of modulation 0%.When the index of modulation 0%, voltage pulse a1, a2's
Width is 60 degree.Keep index of modulation Kh minutely increased, needs to make the width of voltage pulse a1, a2 to increase Δ a.
At this point, voltage pulse can be nearby arranged at 90 degree (maximum points of U phase voltages Vu) in the 1st pulse mode P1.It is therefore contemplated that
The voltage higher hamonic wave of 1st pulse mode P1 is smaller, and higher hamonic wave loss is also smaller.
The reasons why 2 pulse mode is selected when index of modulation Kh ＜ 0, illustrates as described above.
In Figure 10, umber of pulse Pno is also the same in the case of being more than 3.Pulse mode shown in Fig. 10 is 120 degree of periods, only
Including 3 overtones band ingredients.In the case where ac motor 1 is three-phase, since 3 overtones band ingredients are eliminated, so high order is humorous
Wave loss becomes zero.Therefore, as long as impulse phase is by correctly most suitableization, independently with umber of pulse Pno, become same with Figure 10
The pulse mode of sample.Such as in the case where umber of pulse Pno is 5, when index of modulation Kh it is asymptotic 0% when, voltage as can be seen from FIG. 8
Asymptotic 60 degree of pulse width a1 (can see voltage-phase θ v in the 2nd pulse mode P2：30 degree of 60 degree~90 degree of width, according to
Symmetry voltage-phase θ v：60 degree of 60 degree~120 degree of width).
The simple switching method and the matching of Fig. 7, Fig. 9 of the index of modulation 0% are illustrated.
It is the pulse mode that boundary makes higher hamonic wave loss Wh minimize with the index of modulation 0%, as described above in Fig. 7, Fig. 9
It switches over.In addition, when the index of modulation 0%, it is 0 that higher hamonic wave, which loses Wh, and pulse mode P1, P2 are correctly most suitable for respectively
Change.
According to the above, by, for boundary's switch pulse pattern P1, P2, it is humorous can simply to reduce high order with the index of modulation 0%
Wave loses.
The switching of pulse mode P1, P2 can also be only near the index of modulation ± 100%.Here, with " near " word is
Because the case where capable of exporting the stringent index of modulation ± 100%, is defined in 1 pulsed drive.(table 2) expression index of modulation ±
Pulse mode switching near 100%.The n of n and Fig. 5 of (table 2) are identical, are the n of umber of pulse " Pno=2n-1 ".Below to table 2
Foundation illustrate.
[table 2]
| N=2p-1 | N=2p | |
| Near index of modulation Kh=+100% | P1 | P2 |
| Near index of modulation Kh=-100% | P2 | P1 |
Figure 11 is umber of pulse 3 (n=2), the pulse mode near the index of modulation+100%.Make index of modulation Kh from
In the case that 100% is minutely reduced, need to make the width of voltage pulse a1, a2 to reduce pulse width Δ a.At this point, working as from 90
When degree nearby cuts down voltage pulse, the decrement of fundamental wave component is bigger than the decrement of higher harmonic component.Therefore, the 1st pulse mode
It is big that the higher hamonic wave of formula P1 loses the higher hamonic wave loss than the 2nd pulse mode P2.Therefore, in umber of pulse 3 (n=2), modulation system
+ 100% the 2nd pulse mode P2 selected around of number.For generalization, in Fig. 5, there is the pulse mode across 90 degree of voltage pulse
Higher hamonic wave loss near the index of modulation+100% is small.Conversely, the pulse mode with the voltage pulse not across 90 degree,
Higher hamonic wave loss near the index of modulation -100% is small.It summarizes to above-mentioned, obtains the switching method of (table 2).
The switching method of (table 2) and the matching of Fig. 7, Fig. 9 are illustrated.In Fig. 7 (umber of pulses 3：N=2 it in), is adjusting
The higher hamonic wave loss of pulse mode P2 is smaller near coefficient+100% processed, the pulse mode P1 near the index of modulation -100%
Higher hamonic wave loss is smaller.In addition, in Fig. 9 (umber of pulses 5：N=3 in), the pulse mode P1 near the index of modulation+100%
Higher hamonic wave loss is smaller, and the higher hamonic wave loss of pulse mode P2 is smaller near the index of modulation -100%.The above content with
The switching method of (table 2) is matched.
The switching method of (table 2) can also simply be implemented.I.e., it is possible in the situation that index of modulation Kh is specified value or more
It is lower as near the index of modulation+100%, it is below as near the index of modulation -100% in specified value, using (table
2).This is because the absolute value of higher hamonic wave loss is the big situation of absolute value of the index of modulation greatly, as long as in such case
Under, it will be able to make higher hamonic wave minimization of loss.That is, higher hamonic wave loss can be efficiently reduced with few switching times.
Umber of pulse be specified value more than in the case of, can also stop pulse pattern P1, P2 switching.This is because
Umber of pulse is more, and the absolute magnitude of higher hamonic wave loss is more reduced.
(embodiment 2)
Hereinafter, being described with reference to the embodiment of the present invention 2.
Figure 12 indicates the structure chart of the embodiment of the present invention 2.Aspect wherein same as Example 1 omits the description.Implement
In example 2, inverter control unit 3 includes the 1st carrier wave output unit 521, the 2nd carrier wave output unit 531, carrier switch unit
541, sinewave output unit 57, PWM units 58.Illustrate that thus, it is possible to simply implement the switching of pulse mode.
1st carrier wave C1 is output to carrier switch unit 541 by the 1st carrier wave output unit 521.
2nd carrier wave C2 is output to carrier switch unit 541 by the 2nd carrier wave output unit 531.
Carrier switch unit 541 switched carrier C1, C2, are output to PWM units 58.
Sinewave output unit 57 is based on index of modulation Kh by U phase voltage directives Vu*It is output to PWM units 58.
PWM units 58 are based on selected carrier wave Cx and U phase voltage directives Vu*Pwm signal P-PWM is output to grid letter
Number computing unit.
Movement oscillogram when Figure 13 is the selection of the 1st carrier wave.In addition, movement oscillogram when Figure 14 is the selection of the 2nd carrier wave.
Carrier wave C1, C2 positive and negative symbol by switching them on the contrary, switch pwm signal P-PWM.The case where selecting carrier wave C1, C2, point
Not Dui Yingyu selection example 1 the 1st pulse mode P1, the 2nd pulse mode P2 the case where.
Compared with the above embodiments 1, this embodiment is characterized in that, the table of pulse mode P1, P2 need not be stored
In memory.That is, the sign-inverted of carrier wave can be made to assemble according to index of modulation Kh.Therefore, it is possible to cut down inverter control
The cost of unit 3 processed.
(embodiment 3)
Hereinafter, being described with reference to the embodiment of the present invention 3.Figure 15 indicates the structure chart of the embodiment of the present invention 3.Wherein
Aspect same as Example 1 omits the description.In embodiment 3, use the control of inverter 2 as the driving source of the wheel 6 of vehicle 7
Ac motor 1.
Ac motor 1 is incorporated in the inside of wheel 6, so the torque density of unit volume is designed to be high.Cause
This, the loss of ac motor 1, which reduces, becomes important topic.According to the present invention, do not change umber of pulse, i.e., does not increase inverter 2
Loss, it will be able to reduce ac motor 1 higher hamonic wave loss.It is minimized, simply therefore, it is possible to make cooling system realize
Change.
Reference sign
1 ... ac motor
2 ... inverter units
3 ... current detecting units
4 ... position and speed detection units
5 ... inverter control units
51 ... output voltage computing units
52 ... the 1st pulse mode computing units
53 ... the 2nd pulse mode computing units
531 ... the 1st carrier wave output units
532 ... the 2nd carrier wave output units
54 ... pulse mode switch units
541 ... carrier switch units
55 ... grid signal computing units
56 ... umber of pulse computing units
57 ... sinewave output units
58 ... PWM units
6 ... wheels
7 ... vehicles
VDC ... DC voltages
Vu, Vv, Vw ... U phase voltages, V phase voltages, W phase voltages
Vu*... U phase voltage directives
V1 ... motor voltages
Iu, Iv, Iw ... U phase currents, V phase currents, W phase currents
θ v ... voltage-phases
θ ... rotor phases
ω*... speed command
ω ... rotary speeies
Kh ... the indexes of modulation
The 1st pulse modes of P1 ...
The 2nd pulse modes of P2 ...
P-PWM ... pwm signals
The 1st carrier waves of C1 ...
The 2nd carrier waves of C2 ...
a1、a2、…、an：Voltage pulse
Pno ... umber of pulses.
Claims (5)
1. a kind of inverter carries out switch motion to direct current and the direct current is converted to exchange, the inverter is characterized in that：
Switch the 1st pulse mode and the 2nd pulse mode, the voltage-phase 0~180 of the 1st pulse mode based on the index of modulation
Degree, 180~360 degree of umber of pulse are respectively n, (n-1), 0~180 degree of voltage-phase of the 2nd pulse mode, 180~360
The umber of pulse of degree is respectively (n-1), n, wherein and n is integer, and the umber of pulse in each period is (2n-1),
Switch the 1st pulse mode to minimize with the higher hamonic wave loss Wh of formula 3 with the 2nd pulse mode,
Wherein, An：N times voltage higher hamonic wave, n：Number, λ：Loss coefficient, 0≤λ≤2.
2. inverter as described in claim 1, it is characterised in that：
Fundamental frequency based on inverter changes the umber of pulse.
3. inverter as described in claim 1, it is characterised in that：
In the case where the umber of pulse is specified value or more, stop the switching of the pulse mode.
4. inverter as described in claim 1, it is characterised in that：
Carrier wave is set to invert based on the index of modulation.
5. a kind of drive system, it is characterised in that：
Using the inverter control of claim 1 as the ac motor of the driving source of drive system.
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| JP2014-124895 | 2014-06-18 | ||
| JP2014124895A JP6239448B2 (en) | 2014-06-18 | 2014-06-18 | Inverter and drive system using the same |
| PCT/JP2015/059014 WO2015194225A1 (en) | 2014-06-18 | 2015-03-25 | Inverter and drive system using same |
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| CN106464154B true CN106464154B (en) | 2018-09-11 |
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| JP (1) | JP6239448B2 (en) |
| CN (1) | CN106464154B (en) |
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| JP6372497B2 (en) * | 2016-02-18 | 2018-08-15 | 株式会社デンソー | Inverter control device |
| JP6674804B2 (en) * | 2016-03-15 | 2020-04-01 | 株式会社日立産機システム | Motor control device and drive system |
| JP6828297B2 (en) * | 2016-08-09 | 2021-02-10 | 株式会社デンソー | Car |
| JP6500872B2 (en) | 2016-10-19 | 2019-04-17 | トヨタ自動車株式会社 | Drive and car |
| JP6439771B2 (en) | 2016-10-19 | 2018-12-19 | トヨタ自動車株式会社 | Driving device and automobile |
| JP6939693B2 (en) | 2018-04-27 | 2021-09-22 | 株式会社豊田自動織機 | Pulse pattern generator |
| JP6955221B2 (en) * | 2018-04-27 | 2021-10-27 | 株式会社豊田自動織機 | Inverter |
| JP6813074B1 (en) * | 2019-10-30 | 2021-01-13 | 株式会社明電舎 | Power conversion system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6107776A (en) * | 1998-01-30 | 2000-08-22 | Kabushiki Kaisha Toshiba | Inverter control device |
| CN101064483A (en) * | 2006-04-26 | 2007-10-31 | 日产自动车株式会社 | Device and method for controlling power converting device |
| CN101188387A (en) * | 2006-11-22 | 2008-05-28 | 株式会社日立制作所 | Electric power conversion device |
| JP2013187933A (en) * | 2012-03-06 | 2013-09-19 | Toyota Central R&D Labs Inc | Motor controller |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57196872A (en) * | 1981-05-26 | 1982-12-02 | Toshiba Corp | Controlling method of pulse width modulation control inverter |
| JPS59204469A (en) * | 1983-04-30 | 1984-11-19 | Shinano Denki Kk | Inverter device |
| JPS59216476A (en) * | 1983-05-19 | 1984-12-06 | Toyota Central Res & Dev Lab Inc | Current controlling method and device of inverter |
| JPH08331856A (en) * | 1995-05-30 | 1996-12-13 | Toshiba Corp | Power converting apparatus |
| JP4858597B2 (en) * | 2008-11-28 | 2012-01-18 | 株式会社デンソー | Rotating machine control device and manufacturing method thereof |
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- 2014-06-18 JP JP2014124895A patent/JP6239448B2/en active Active
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- 2015-03-25 CN CN201580024284.0A patent/CN106464154B/en active Active
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6107776A (en) * | 1998-01-30 | 2000-08-22 | Kabushiki Kaisha Toshiba | Inverter control device |
| CN101064483A (en) * | 2006-04-26 | 2007-10-31 | 日产自动车株式会社 | Device and method for controlling power converting device |
| CN101188387A (en) * | 2006-11-22 | 2008-05-28 | 株式会社日立制作所 | Electric power conversion device |
| JP2013187933A (en) * | 2012-03-06 | 2013-09-19 | Toyota Central R&D Labs Inc | Motor controller |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6239448B2 (en) | 2017-11-29 |
| WO2015194225A1 (en) | 2015-12-23 |
| CN106464154A (en) | 2017-02-22 |
| JP2016005378A (en) | 2016-01-12 |
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