CN106464154A - Inverter and drive system using same - Google Patents
Inverter and drive system using same Download PDFInfo
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- CN106464154A CN106464154A CN201580024284.0A CN201580024284A CN106464154A CN 106464154 A CN106464154 A CN 106464154A CN 201580024284 A CN201580024284 A CN 201580024284A CN 106464154 A CN106464154 A CN 106464154A
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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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- Control Of Ac Motors In General (AREA)
Abstract
The present invention pertains to an inverter and a drive system using the same, in particular, a technology for reducing harmonic losses in an AC motor. The present invention addresses the problem of realizing a pulse pattern for maintaining minimization of harmonic losses in an AC motor. In order to solve this problem, the present invention provides an inverter that converts direct current to alternating current by switching, wherein the inverter is characterized by the following: n is an integer; the number of pulses per one cycle is (2n-1); and that on the basis of a modulation index, switching is performed between a first pulse pattern in which the number of pulses of voltage phases of 0-180 degrees and 180-360 degrees are respectively n and (n-1), and a second pulse pattern in which the number of pulses of voltage phases of 0-180 degrees and 180-360 degrees are respectively (n-1) and n. Due to the present invention, harmonic losses in an AC motor can be minimized, and due to this configuration, effects such as preventing degradation of material characteristics and downsizing a cooling system can be obtained.
Description
Technical field
The present invention relates to inverter and use its drive system, damaging particularly to the higher hamonic wave reducing ac motor
The technology lost.
Background technology
In order to drive ac motor efficiently, the variable speed drive of application inverter is effective.Inverter includes out
Close element, the alternating voltage of optional frequency can be applied to ac motor.But, voltage, electricity can be produced because of switch motion
Stream higher hamonic wave, the reason that become higher hamonic wave loss (magnetic hysteresis loss (Hysteresis loss), eddy current losses etc.).This
Not only make efficiency reduce, but also the material behavior of magnet, electromagnetic steel plate etc. can be made because of heat to deteriorate.Accordingly, it would be desirable 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 cycle of motor, the quantity of the voltage pulse of inverter output.By the regulation of umber of pulse, voltage high order can be suppressed
Harmonic wave, reduces higher hamonic wave loss.
In (patent document 2), to make higher hamonic wave loss divided by being worth obtained by first-harmonic electric power for minimum mode regulation arteries and veins
Rush phase place.Impulse phase is voltage-phase when being ON or OFF for the voltage pulse.When impulse phase is determined, voltage high order is humorous
Ripple is also determined, and then can ask for higher hamonic wave loss approx.Impulse phase is made to be best suitable in the way of minimizing it.
The problem points of (patent document 1) is, in the case of cannot changing umber of pulse, it is impossible to reduces higher hamonic wave and damages
Lose.Umber of pulse depends on the characteristic of the switch element of inverter or the rotary speed of ac motor, so might not
Arbitrarily change.In (patent document 2), even if umber of pulse is identical, reduces higher hamonic wave also by making impulse phase be best suitable for and damage
Lose.But, when being best suitable for of impulse phase, the minimization of higher hamonic wave loss is possible to stop, might not minimizing.
In order to make higher hamonic wave minimization of loss, need to make impulse phase be best suitable for by each pulse mode of inverter
Change, and the pulse mode after being best suitable for is compared each other.Pulse mode is joining of 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 is 0
The umber of pulse of～180 degree is：n；Voltage-phase is that the umber of pulse of 180～360 degree is：(n-1).2nd pulse mode, voltage-phase
It is that the umber of pulse of 0～180 degree is：(n-1)；Voltage-phase is that the umber of pulse of 180～360 degree is：n.Whole pulse mode quilts
It is divided into the one in the 1st pulse mode, the 2nd pulse mode.Therefore, if making the 1st pulse mode, the 2nd pulse mode respectively
Applicableization, and then select to lose less pulse mode after optimization, it becomes possible to make higher hamonic wave minimization of loss.
Prior art literature
Patent document
Patent document 1：Japanese Unexamined Patent Publication 2011-223772 publication
Patent document 2：Japanese Unexamined Patent Publication 2012-120250 publication
Non-patent literature
Non-patent literature 1：The Institution of Electrical Engineers：Motor controls engineering, Ohmsha, pp.132-152 (2007)
Content of the invention
Invention problem to be solved
The present invention relates to inverter and use its drive system, particularly realizing the high order for reducing ac motor
The pulse mode control of harmonic losses.
For solving the method for problem
In order to realize above-mentioned problem, the present invention be a kind of direct current is carried out switch motion this direct current is converted to exchange inverse
Become device, it is characterised in that：Based on index of modulation switching the 1st pulse mode and the 2nd pulse mode, the electricity of described 1st pulse mode
Pressure 0～180 degree of phase place, the umber of pulse of 180～360 degree are respectively n, (n-1), and the voltage-phase of described 2nd pulse mode 0～
180 degree, umber of pulse respectively (n-1), the n of 180～360 degree, wherein, n is integer, and the umber of pulse in each cycle is (2n-
1).
Further, the inverter of the present invention is characterised by：Change above-mentioned umber of pulse based on the fundamental frequency of inverter.
Further, the inverter of the present invention is characterised by：Switch described 1st pulse mode and described 2nd pulse mode with
The higher hamonic wave loss Wh making (formula 3) minimizes (wherein, An：N voltage higher hamonic wave, n：Overtone order, λ：Loss coefficient (0
≤λ≤2)).
Further, the inverter of the present invention is characterised by：When the described index of modulation is timing, switch to described 1st pulse
Pattern, when the described index of modulation is for, when negative, switching to described 2nd pulse mode.
Further, the inverter of the present invention is characterised by：At least one mode in as follows switches the described 1st
Pulse mode and described 2nd pulse mode, i.e.：
(1) described n is odd number and when the index of modulation is more than setting, switches to the 1st pulse mode；
(2) described n is odd number and when the index of modulation is below setting, switches to the 2nd pulse mode；
(3) described n is even number and when the index of modulation is more than setting, switches to the 2nd pulse mode；With
(4) described n is even number and when the index of modulation is below setting, switches to the 1st pulse mode.
Further, the inverter of the present invention is characterised by：In the case that described umber of pulse is more than setting, stop institute
State the switching of pulse mode.
Further, the inverter of the present invention is characterised by：Carrier wave is made to invert based on the described index of modulation.
In addition, the drive system of the present invention is characterised by：Utilize the inverter control of the present invention as drive system
The ac motor in 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 deterioration of characteristic, the effect of miniaturization etc. of cooling system.
Brief description
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 graph of a relation with impulse phase for the index of modulation of umber of pulse 3.
Fig. 7 is the graph of a relation with higher hamonic wave loss for the index of modulation of umber of pulse 3.
Fig. 8 is the graph of a relation with impulse phase for the index of modulation of umber of pulse 5.
Fig. 9 is the graph of a relation with higher hamonic wave loss for the index of modulation of umber of pulse 5.
Figure 10 is the pulse mode near umber of pulse the 3rd, the index of modulation 0%.
Figure 11 is the pulse mode near umber of pulse the 3rd, the index of modulation+100%.
Figure 12 is the structure chart of the inverter of embodiment 2.
Figure 13 is a case of movement oscillogram during the 1st carrier wave selection.
Figure 14 is a case of movement oscillogram during the 2nd carrier wave selection.
Figure 15 is the structure chart of the drive system of the inverter using embodiment 3.
Detailed description of the invention
Below, with accompanying drawing, various embodiments of the present invention are illustrated.
(embodiment 1)
With Fig. 1～Figure 11, embodiment 1 is illustrated.
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 voltage by inverter 2
Vw), flow three-phase alternating current (U phase current Iu, V phase current Iv, W phase current Iw), produces motor torque.Wherein, exchange
Motor 1 is assumed to three-phase and illustrates, but in the case of beyond three-phase too.
The quantity of state of ac motor 1 is illustrated.Fig. 2 is the polar plot of voltage, electric current.U axle represents AC electrical
The flow direction that the U phase coil of machine 1 produces.V axle and W axle are too.S axle is the axle making U axle counterclockwise 90-degree rotation.d
Axle represents the rotary shaft of ac motor 1, and its phase place is the θ on the basis of S axle.In addition, the rotary speed of d axle, 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 its voltage-phase is for S axle being
The θ v of benchmark.
Inverter 2 is converted into three-phase alternating voltage by carrying out switch motion to DC voltage VDC, and output is to exchange
Motor 1.
Current detecting unit 3 detects three-phase alternating current, and inverter control unit 5 is arrived in output.
Position-speed detection unit 4 detects rotor phase θ and rotary speed ω of ac motor 1, and inverter is arrived in output
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 exports inverter 2.Thus, the switch of inverter 2 is controlled (PWM controls), the rotation speed of ac motor 1
Degree ω converges on speed command ω*.Rotational speed command ω*Also torque instruction or current-order etc. can be replaced into.
The inscape of inverter control unit 5 be output voltage computing unit the 51st, the 1st pulse mode computing unit the 52nd,
2nd pulse mode computing unit the 53rd, pulse mode switch unit the 54th, signal computing unit the 55th, umber of pulse computing unit 56.
Hereinafter each inscape is illustrated.
Output computing unit 51 based on three-phase alternating current, rotor phase θ, rotary speed ω, calculate voltage-phase θ v and
Index of modulation Kh.For example calculate with below step.
(1) vector controlled according to non-patent literature 1, calculates motor voltage V1 and voltage-phase θ v.
(2) by motor voltage V1 is derived index of modulation Kh divided by DC voltage VDC.
After above-mentioned calculating, voltage-phase θ v is output to signal computing unit 55.In addition, index of modulation Kh is output
To the 1st pulse mode computing unit the 52nd, the 2nd pulse mode computing unit 53.
1st pulse mode computing unit the 52nd, the 2nd pulse mode computing unit 53, based on index of modulation Kh and umber of pulse Pno
Export the 1st pulse mode P1, the 2nd pulse mode P2 respectively.This for example by advance in memory storage table realize.Pulse
Number Pno is the sum of the voltage pulse in each cycle of ac motor, is odd number " Pno=according to odd symmetry described later
2n-1(n：Integer) ".In addition, pulse mode is the configuration pattern of the corresponding voltage pulse with voltage-phase θ v.Whole pulses
Pattern is divided into the 1st pulse mode, the 2nd pulse mode, and its definition is as shown in table 1.This definition is based on according to odd symmetry described later
There is not the pulse mode across 0 degree or 180 degree in property.
[table 1]
| The umber of pulse of 0 degree≤θ v≤180 degree | The umber of pulse of 180 degree≤θ v≤360 degree | |
| 1st pulse mode | n | n-1 |
| 2nd pulse mode | n-1 | n |
Fig. 3 represents pulse mode during umber of pulse 3, and Fig. 4 represents pulse mode during umber of pulse 5.The a1 of Fig. 3, Fig. 4,
A2 ... an, represents the numbering of voltage pulse.Impulse phase α the 1st, α is the 2nd ... α m (m：Integer) be voltage pulse be ON or OFF
When voltage-phase θ v.Pulse mode is typically set to satisfied (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) represents odd symmetry, has effect that the phase place unification of the higher hamonic wave comprising in pulse mode is zero.Separately
Outward, (formula 2) represents half-wave symmetry, the effect having the amplitude making even harmonic to be zero.According to their symmetry, pulse
Pattern is defined as only between 0～90 degree.Therefore, if the umber of pulse shown in Fig. 33 only determines impulse phase α 1, Fig. 4 institute
Only determining impulse phase α the 1st, α 2 in the umber of pulse 5 shown, pulse mode just is prescribed.In general, umber of pulse " Pno=
In 2n-1 ", pulse mode is specified by (n-1) individual impulse phase.
Fig. 5 represents the pulse mode during vague generalization of umber of pulse Pno.According to Fig. 5, it is known that herein below.
In (1) the 1st pulse mode P1, there is the pulse connecting with the inner side (direction comprising 90 degree) of 0 degree, 180 degree.
It in (2) the 1st pulse mode P1, is odd number " n=2p-1 (p at the n of umber of pulse " Pno=2n-1 "：Integer) " feelings
Under condition, there is the pulse comprising 90 degree.It is even number " n=2p (p at n：Integer) " in the case of, there is not the pulse across 90 degree.
The character of (3) the 2nd pulse mode P2 is contrary with the 1st pulse mode P1.
(4), when switch pulse pattern P1, P2, pulse mode (figure) changes (can not change continuously) discontinuously.
Pulse mode switch unit 54 switches the 1st pulse mode P1, the 2nd pulse based on index of modulation Kh or umber of pulse Pno
Pattern P2.Selected pulse mode Px is output to signal computing unit 55.
Signal computing unit 55 calculates signal Guvw based on voltage-phase θ v and strobe pulse pattern Px.For example
As shown in the some Q of Fig. 3, voltage-phase θ v be 90 degree and the 1st pulse mode P1 selected in the case of, signal is
OFF.Three-phase calculating is carried out to it, signal Guvw is exported inverter 2.
Umber of pulse computing unit 56 is based on the material behavior (omitting diagram) etc. of the fundamental frequency of inverter 2 or switch element, meter
Calculate umber of pulse Pno.Also the fundamental frequency of inverter 2 can be substituted (because if exchanging with rotary speed ω of ac motor 1
Motor 1 is synchronous motor, then they are consistent).By the regulation 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 best suitable for.Umber of pulse Pno is output to the 1st pulse mode the 52nd, the 2nd pulse
Pattern the 53rd, pulse mode switch unit 54.
According to foregoing, switch pulse pattern P1, P2, control inverter 2 by selected pulse mode Px in addition,
Thus drive ac motor 1.
The reason losing Wh minimum to the higher hamonic wave that can make ac motor 1 according to the present invention illustrates.
Higher hamonic wave loss Wh is the summation of the magnetic hysteresis loss being produced by electric current higher hamonic wave In or eddy current losses etc., uses
(formula 3) represents.
[formula 3]
Wherein, An：Voltage higher hamonic wave, n：Higher hamonic wave number of times, λ：Loss coefficient
Voltage higher hamonic wave An is the higher hamonic wave that pulse mode is comprised, by carrying out fft analysis to pulse mode
Ask for.Loss coefficient λ represents the frequency dependence of higher hamonic wave loss Wh, is the coefficient of less than more than 02.According to higher hamonic wave
The main cause of loss, determines as follows.
(1) λ=0：There is no frequency dependence, the situation based on copper loss
(2) λ=1：Situation based on magnetic hysteresis loss
(3) λ=2：Situation based on eddy current losses
The switching by pulse mode P1, P2 for the following presentation, makes the higher hamonic wave minimization of loss of (formula 3).
Fig. 6 is the graph of a relation 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
The free degree is only impulse phase α 1.Therefore, impulse phase α 1 uniquely determines according to index of modulation Kh.Understand for example selecting the 1st
In the case of pulse mode P1, index of modulation Kh gets over to be increased, more asymptotic 90 degree of impulse phase α 1 (the upper figure of Fig. 6).This means
In Fig. 3, the width of voltage pulse a1 increases.Otherwise, index of modulation Kh gets over and reduces, more asymptotic 0 degree of impulse phase α 1, the electricity of Fig. 3
The width of pressure pulse a1 reduces.Case above is with regard to the 2nd pulse mode too.
Fig. 7 is the graph of a relation of the index of modulation Kh and higher hamonic wave loss Wh of umber of pulse 3.Higher hamonic wave loss Wh according to
(formula 3) is asked for, and loss coefficient λ is assumed to zero.In addition, higher hamonic wave loss Wh is with the index of modulation 100% (during 1 pulsed drive)
Higher hamonic wave loss is 1 to be standardized (unit：p.u.).Interval M1, M2 of Fig. 7 represents that the high order of pulse mode P1, P2 is humorous
The ripple loss Wh interval less than the opposing party.Therefore, interval M1, M2 are able to be made by switching to pulse mode P1, P2
Higher hamonic wave minimization of loss.For example, the index of modulation 60% is included in interval M1, strobe pulse pattern P1.Now, with selection
The situation of P2 is compared, and higher hamonic wave loss Wh can be reduced 2.7p.u..Interval M1 does not apply pulse mode P2, interval
M2 does not apply pulse mode P1.Do not apply their pulse mode, be the grey parts of Fig. 6.
As shown in Figure 6, in umber of pulse 3, impulse phase α 1 uniquely determines according to index of modulation Kh, so not by pulsion phase
The free degree of position being best suitable for of α 1.Therefore, with can not be by higher hamonic wave minimization of loss by the method for being best suitable for of impulse phase.
In the present invention, by utilizing pulse mode switch unit 54 switch pulse pattern itself, higher hamonic wave minimization of loss can be made.
Fig. 8 is the graph of a relation 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 is impulse phase α the 1st, α 2 the two.Therefore, impulse phase α the 1st, α 2 is not uniquely determined by index of modulation Kh, so
Have the free degree of being best suitable for of impulse phase.Although the diagram of eliminating, more than 7 pulses too, umber of pulse is got over to be increased, the suitableeest
The free degree of combination also increases.Impulse phase shown in Fig. 8 is to come in the way of minimizing the higher hamonic wave loss Wh of (formula 3)
The result of being best suitable for.
Fig. 9 is the graph of a relation of the index of modulation Kh and higher hamonic wave loss Wh of umber of pulse 5.Understand and the pulse shown in Fig. 7
The situation of several 3 can make higher hamonic wave minimization of loss by switch pulse pattern P1, P2 equally.Pulse mode P1, P2 are
Through completing being best suitable for, in respective pulse mode, higher hamonic wave is lost by minimization.But, in order to make higher hamonic wave lose
Minimize, need to compare them, utilize pulse mode switch unit 54 to switch over.
In the case of umber of pulse more than 5, only make being best suitable for of impulse phase can not make higher hamonic wave minimization of loss, be
Because the discontinuity of pulse mode P1, P2 causes.According to Fig. 5, do not change umber of pulse, it is impossible to make pulse mode P1,
P2 changes continuously.That is, pulse mode P1, P2 can not (criterion) being best suitable in a like fashion, need the suitableeest respectively
With change and both are compared.Currently invention addresses this point, be provided with pulse mode switch unit 54.
According to foregoing, the higher hamonic wave loss Wh of ac motor 1 can be made to minimize.Add below
Bright.
The switching of pulse mode P1, P2 is not required to all implement, it is also possible to omit a part.For example, it is possible to modulation
Coefficient 0% switches over for boundary.
(1) index of modulation Kh ＞ 0：1st pulse mode P1
(2) index of modulation Kh ＜ 0：2nd pulse mode P2
In order to obtain the boundary value of interval M1, M2, need to solve with (formula 3) being best suitable for problem as object function.But
Being to need situation about switching at the index of modulation 0%, the symmetry according to pulse mode is just it is understood that be not required to
The calculating of applicableization.The reason of the 1st pulse mode P1 is selected to illustrate when below to modulation COEFFICIENT K h ＞ 0.
Figure 10 is the pulse mode near umber of pulse the 3rd, the index of modulation 0%.During the index of modulation 0%, voltage pulse a1, a2's
Width is 60 degree.In the case of making index of modulation Kh increase minutely, the width making voltage pulse a1, a2 is needed to increase Δ a.
Now, the 1st pulse mode P1 can arrange voltage pulse near 90 degree (maximum points of U phase voltage Vu).It is therefore contemplated that
The voltage higher hamonic wave of the 1st pulse mode P1 is less, and higher hamonic wave loss is also less.
Select the reason of the 2nd pulse mode during index of modulation Kh ＜ 0, illustrate as described above.
In Figure 10, in the case that umber of pulse Pno is more than 3 too.Pulse mode shown in Figure 10 is 120 degree of cycles, only
Comprise 3 overtones band compositions.In the case that ac motor 1 is three-phase, owing to 3 overtones band compositions are eliminated, so high order is humorous
Ripple loss becomes zero.Therefore, as long as impulse phase is by correctly being best suitable for, with umber of pulse Pno independently, become same with Figure 10
The pulse mode of sample.For example in the case that umber of pulse Pno is 5, when index of modulation Kh asymptotic 0% when, according to Fig. 8 understand voltage
Asymptotic 60 degree of pulse width a1 (can see voltage-phase θ v in the 2nd pulse mode P2：The width of 60 degree～90 degree 30 degree, according to
Symmetry voltage-phase θ v：The width of 60 degree～120 degree 60 degree).
The simple switching method and the matching of Fig. 7, Fig. 9 of the index of modulation 0% is illustrated.
In Fig. 7, Fig. 9, make the pulse mode that higher hamonic wave loss Wh minimizes with the index of modulation 0% for boundary, as mentioned above
Switch over.In addition, during the index of modulation 0%, higher hamonic wave loss Wh is 0, and pulse mode P1, P2 are correctly best suitable for respectively
Change.
More than according to, by with the index of modulation 0% for boundary's switch pulse pattern P1, P2, high order can be reduced simply humorous
Ripple loses.
The switching of pulse mode P1, P2 also can be only near the index of modulation ± 100%.Here, with " near " word is
Because the situation that can export the strict index of modulation ± 100% is defined in 1 pulsed drive.(table 2) expression index of modulation ±
Pulse mode switching near 100%.The n of (table 2) is identical with the n of Fig. 5, is the n of umber of pulse " Pno=2n-1 ".Below to table 2
According to illustrating.
[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
100% in the case of reduce minutely, needs to make the width of voltage pulse a1, a2 to reduce pulse width Δ a.Now, when from 90
When cutting down voltage pulse near degree, the decrement of first-harmonic composition is bigger than the decrement of higher harmonic component.Therefore, the 1st pulse mode
The higher hamonic wave loss than the 2nd pulse mode P2 for the higher hamonic wave loss of formula P1 is big.Therefore, in umber of pulse 3 (n=2), modulation system
Number+100% the 2nd pulse mode P2 selected around.For vague generalization, in Fig. 5, there is the pulse mode across the voltage pulse of 90 degree
Higher hamonic wave loss near the index of modulation+100% is little.Otherwise, there is the pulse mode of the voltage pulse not across 90 degree,
Higher hamonic wave loss near the index of modulation-100% is little.Summarize to above-mentioned, obtain the changing method of (table 2).
The changing method and the matching of Fig. 7, Fig. 9 of (table 2) is illustrated.In Fig. 7 (umber of pulse 3：N=2), in, adjusting
Near coefficient+100% processed, the higher hamonic wave loss of pulse mode P2 is less, pulse mode P1 near the index of modulation-100%
Higher hamonic wave loss is less.In addition, in Fig. 9 (umber of pulse 5：N=3) in, pulse mode P1 near the index of modulation+100%
Higher hamonic wave loss is less, and near the index of modulation-100%, the higher hamonic wave loss of pulse mode P2 is less.Above content with
The changing method of (table 2) mates.
The changing method of (table 2) also can be implemented simply.I.e., it is possible in the situation that index of modulation Kh is more than setting
Lower as the index of modulation+100% near, in the case of below setting as the index of modulation-100% near, apply (table
2).This is because, the absolute value of higher hamonic wave loss is greatly the big situation of the absolute value of the index of modulation, as long as in this situation
Under, it becomes possible to make higher hamonic wave minimization of loss.That is, higher hamonic wave loss can be efficiently reduced with few switching times.
In the case that umber of pulse is more than setting, it is also possible to stop pulse pattern P1, the switching of P2.This is because,
Umber of pulse is more, and the absolute magnitude of higher hamonic wave loss is got over and reduced.
(embodiment 2)
Hereinafter, with reference to the accompanying drawings of embodiments of the invention 2.
Figure 12 represents the structure chart of embodiments of the invention 2.Aspect wherein same as in Example 1 omits the description.Implement
In example 2, inverter control unit 3 includes the 1st carrier wave output unit the 521st, the 2nd carrier wave output unit the 531st, carrier switch unit
541st, sinewave output unit the 57th, PWM unit 58.Illustrate the switching that it is possible to implement pulse mode simply.
1st carrier wave C1 is exported carrier switch unit 541 by the 1st carrier wave output unit 521.
2nd carrier wave C2 is exported carrier switch unit 541 by the 2nd carrier wave output unit 531.
Carrier switch unit 541 switched carrier C1, C2, PWM unit 58 is arrived in output.
Sinewave output unit 57 based on index of modulation Kh by U phase voltage directive Vu*PWM unit 58 is arrived in output.
PWM unit 58 is based on selected carrier wave Cx and U phase voltage directive Vu*Pwm signal P-PWM is exported grid letter
Number computing unit.
Figure 13 is movement oscillogram during the 1st carrier wave selection.In addition, Figure 14 is movement oscillogram during the 2nd carrier wave selection.
The positive and negative symbol of carrier wave C1, C2 is contrary, switches pwm signal P-PWM by switching them.Select the situation of carrier wave C1, C2, point
Dui Yingyu not select the 1st pulse mode P1, the situation of the 2nd pulse mode P2 of embodiment 1.
Compared with the above embodiments 1, this embodiment is characterized in that, it is not necessary to by the table storage of pulse mode P1, P2
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, with reference to the accompanying drawings of embodiments of the invention 3.Figure 15 represents the structure chart of embodiments of the invention 3.Wherein
Aspect same as in Example 1 omits the description.In embodiment 3, control the driving source of the wheel 6 as vehicle 7 with inverter 2
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 reduces and becomes important topic.According to the present invention, do not change umber of pulse, i.e. do not increase inverter 2
Loss, it becomes possible to reduce ac motor 1 higher hamonic wave loss.Therefore, it is possible to make cooling system realize minimizing, simply
Change.
Description of reference numerals
1 ... ac motor
2 ... inverter unit
3 ... current detecting unit
4 ... position and speed detector unit
5 ... inverter control unit
51 ... output voltage computing unit
52 ... the 1st pulse mode computing unit
53 ... the 2nd pulse mode computing unit
531 ... the 1st carrier wave output unit
532 ... the 2nd carrier wave output unit
54 ... pulse mode switch unit
541 ... carrier switch unit
55 ... signal computing unit
56 ... umber of pulse computing unit
57 ... sinewave output unit
58 ... PWM unit
6 ... wheel
7 ... vehicle
VDC ... DC voltage
Vu, Vv, Vw ... U phase voltage, V phase voltage, W phase voltage
Vu*... U phase voltage directive
V1 ... motor voltage
Iu, Iv, Iw ... U phase current, V phase current, W phase current
θ v ... voltage-phase
θ ... rotor phase
ω*... speed command
ω ... rotary speed
Kh ... the index of modulation
P1 ... the 1st pulse mode
P2 ... the 2nd pulse mode
P-PWM ... pwm signal
C1 ... the 1st carrier wave
C2 ... the 2nd carrier wave
a1、a2、…、an：Voltage pulse
Pno ... umber of pulse.
Claims (8)
1. an inverter, its direct current is carried out switch motion this direct current is converted to exchange, described inverter is characterised by：
Based on index of modulation switching the 1st pulse mode and the 2nd pulse mode, the voltage-phase 0～180 of described 1st pulse mode
Degree, the umber of pulse of 180～360 degree are respectively n, (n-1), the voltage-phase 0～180 degree of described 2nd pulse mode, 180～360
The umber of pulse of degree is respectively (n-1), n, and wherein, n is integer, and the umber of pulse in each cycle is (2n-1).
2. inverter as claimed in claim 1, it is characterised in that：
Change described umber of pulse based on the fundamental frequency of inverter.
3. inverter as claimed in claim 1, it is characterised in that：
Switch described 1st pulse mode with described 2nd pulse mode so that the higher hamonic wave loss Wh of (formula 3) minimizes,
Wherein, An：N voltage higher hamonic wave, n：Number of times, λ：Loss coefficient (0≤λ≤2).
4. inverter as claimed in claim 1, it is characterised in that：
When the described index of modulation is timing, switch to described 1st pulse mode,
When the described index of modulation is for, when negative, switching to described 2nd pulse mode.
5. inverter as claimed in claim 1, it is characterised in that：
At least one mode in as follows switches described 1st pulse mode and described 2nd pulse mode, i.e.：
(1) described n is odd number and when the index of modulation is more than setting, switches to the 1st pulse mode；
(2) described n is odd number and when the index of modulation is below setting, switches to the 2nd pulse mode；
(3) described n is even number and when the index of modulation is more than setting, switches to the 2nd pulse mode；With
(4) described n is even number and when the index of modulation is below setting, switches to the 1st pulse mode.
6. inverter as claimed in claim 1, it is characterised in that：
In the case that described umber of pulse is more than setting, stop the switching of described pulse mode.
7. inverter as claimed in claim 1, it is characterised in that：
Carrier wave is made to invert based on the described index of modulation.
8. a drive system, it is characterised in that：
Utilize the ac motor as the driving source of drive system for the inverter control of claim 1.
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| JP2014124895A JP6239448B2 (en) | 2014-06-18 | 2014-06-18 | Inverter and drive system using the same |
| JP2014-124895 | 2014-06-18 | ||
| PCT/JP2015/059014 WO2015194225A1 (en) | 2014-06-18 | 2015-03-25 | Inverter and drive system using same |
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| CN106464154A true CN106464154A (en) | 2017-02-22 |
| CN106464154B CN106464154B (en) | 2018-09-11 |
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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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| 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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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 |
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| CN106464154B (en) | 2018-09-11 |
| WO2015194225A1 (en) | 2015-12-23 |
| JP6239448B2 (en) | 2017-11-29 |
| JP2016005378A (en) | 2016-01-12 |
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