CN103095166B - Modulating method and modulating equipment of space vector pulse width - Google Patents
Modulating method and modulating equipment of space vector pulse width Download PDFInfo
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- CN103095166B CN103095166B CN201310037480.4A CN201310037480A CN103095166B CN 103095166 B CN103095166 B CN 103095166B CN 201310037480 A CN201310037480 A CN 201310037480A CN 103095166 B CN103095166 B CN 103095166B
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Abstract
The invention provides a modulating method and modulating equipment of a space vector pulse width and relates to the field of control. The modulating method and the modulating equipment of the space vector pulse width are capable of enabling the space vector pulse width modulation to output an ideal modulation waveform under the condition that neutral-point voltage in a three-level topology is asymmetric. The modulating method includes obtaining a space vector diagram which corresponds to a voltage in a switching period according to a voltage of a three-phase inverter circuit in the switching period; obtaining a positive small vector section according to a positive small vector in the space vector diagram; obtaining a negative small vector section according to a negative small vector in the space vector diagram; setting an action time ratio of the positive small vector section and the negative small vector section; conducting space vector pulse width modulation on the positive small vector section and the negative small vector section according to the action time ratio. The modulating method and the modulating equipment of the space vector pulse width are used for space vector pulse width modulation.
Description
Technical field
The present invention relates to control field, particularly relate to a kind of space vector pulse width modulation method and modulating equipment.
Background technology
In three-phase inverting circuit, three-level topology has been widely used in the occasions such as frequency converter, uninterruptible power supply provider, power factor correction, Static Var Compensator.SVPWM (SpaceVector PWM, space vector pulse width modulation) modulation technique have also been obtained extensive use in three-level topology.In existing SVPWM modulation, mid-point voltage symmetry is its main feature.The feature of symmetrical 3 level space vector, be that three dimensional vector diagram symmetry is very good, each vector triangle is equilateral triangle, and each sector is 60 ° of symmetries, can export desirable modulation waveform.If mid-point voltage is asymmetric, then cannot export desirable modulation waveform.
Require the figure full symmetric of three dimensional vector diagram in prior art, namely require the neutral point voltage balance in three-level topology, once uneven, will produce the error of calculation, output waveform will produce distortion.When more serious, mid-point voltage is asymmetric, calculates and will produce gross error, and exporting SVPWM waveform will Severe distortion.The feature that traditional SVPWM modulation technique make use of symmetric figure is just to complete the calculating of each vector action time, and traditional algorithm cannot be applied in the unbalanced occasion of mid-point voltage.
In addition, generally, in actual applications, algorithm must increase neutral-point voltage balance.Owing to requiring that three dimensional vector diagram is perfect symmetry figure, inevitable requirement neutral-point voltage balance algorithm responds fast, simultaneously higher to hardware requirement, such as just requires greatly capacitance.Delayed due to control system, particularly under the condition of system dynamic change, mid-point voltage imbalance can cause output waveform Severe distortion, directly affects neutral-point voltage balance.
Summary of the invention
Embodiments of the invention provide a kind of space vector pulse width modulation method and modulating equipment, can, in three-level topology in the asymmetric situation of mid-point voltage, make space vector pulse width modulation export desirable modulation waveform.
For achieving the above object, embodiments of the invention adopt following technical scheme:
First aspect, provides a kind of space vector pulse width modulation method, comprising:
The three dimensional vector diagram corresponding with the voltage in described switch periods is obtained according to the voltage of three-phase inverting circuit in a switch periods;
Positive small vector sector is obtained according to the positive small vector in described three dimensional vector diagram, negative small vector sector is obtained according to the negative small vector in described three dimensional vector diagram, and ratio action time of described positive small vector sector and described negative small vector sector is set, described positive small vector makes the mid-point voltage of described three-phase inverting circuit raise, and described negative small vector makes the mid-point voltage of described three-phase inverting circuit reduce;
According to ratio described action time, space vector pulse width modulation is carried out to described positive small vector sector and described negative small vector sector.
In the first mode in the cards, in conjunction with first aspect, described ratio action time arranging described positive small vector sector and described negative small vector sector comprises:
Be arranged on when carrying out space vector pulse width modulation, the ratio of switch periods number shared by switch periods number shared by described positive small vector sector and described negative small vector sector.
In the second mode in the cards, in conjunction with the first mode in the cards of first aspect or first aspect, described according to ratio described action time, space vector pulse width modulation is carried out to described positive small vector sector and described negative small vector sector and comprises:
In a switch periods, according to ratio and described switch periods described action time, obtain the action time of each vector in described positive small vector sector; Or, obtain the action time of each vector in described negative small vector sector;
According to the action time of each vector in described positive small vector sector, or in described negative small vector sector, the action time of each vector carries out space vector pulse width modulation.
In the third mode in the cards, in conjunction with the first mode in the cards of first aspect or first aspect, described according to ratio described action time, space vector pulse width modulation is carried out to described positive small vector sector and described negative small vector sector and comprises:
According to described ratio synthesis action time virtual vector;
According to described virtual vector sectorization;
The action time of each vector and described virtual vector except described positive small vector and described negative small vector is obtained according to the sector divided according to described virtual vector;
According to described virtual vector, described positive small vector and described negative small vector, and action time of each vector and described virtual vector outside described positive small vector and described negative small vector, the corresponding relation of described virtual vector and described positive small vector and described negative small vector obtains described positive small vector and described negative small vector action time;
In a switch periods, according to the action time of each vector in described positive small vector sector, or in described negative small vector sector, the action time of each vector carries out space vector pulse width modulation.
In the 4th kind of mode in the cards, in conjunction with the third mode in the cards of first aspect or first aspect, the corresponding relation of described virtual vector and described positive small vector and described negative small vector comprises:
V
xt
x=V
+t
++ V
-t
-, wherein, V
xrepresent described virtual vector, t
xrepresent the action time of described virtual vector, V
+represent described positive small vector, t
+represent the action time of described positive small vector, V
-represent described negative small vector, t
-represent the action time of described negative small vector.
Second aspect, provides a kind of equipment, comprising:
Polar plot acquiring unit, for obtaining the three dimensional vector diagram corresponding with the voltage in described switch periods according to the voltage of three-phase inverting circuit in a switch periods;
First sector acquiring unit, for obtaining positive small vector sector according to the positive small vector in described three dimensional vector diagram, negative small vector sector is obtained according to the negative small vector in described three dimensional vector diagram, and ratio action time of described positive small vector sector and described negative small vector sector is set, described positive small vector makes the mid-point voltage of described three-phase inverting circuit raise, and described negative small vector makes the mid-point voltage of described three-phase inverting circuit reduce;
Modulating unit, for according to ratio described action time, carries out space vector pulse width modulation to described positive small vector sector and described negative small vector sector.
In the first mode in the cards, in conjunction with second aspect, when arranging ratio action time of described positive small vector sector and described negative small vector sector, described first se ctor partition unit specifically for:
Be arranged on when carrying out space vector pulse width modulation, the ratio of switch periods number shared by switch periods number shared by described positive small vector sector and described negative small vector sector.
In the second mode in the cards, in conjunction with the first mode in the cards of second aspect or second aspect, described modulating unit comprises:
Time acquisition unit, in a switch periods, according to ratio and described switch periods described action time, obtains the action time of each vector in described positive small vector sector; Or, obtain the action time of each vector in described negative small vector sector;
Pulse modulation unit, for the action time according to each vector in described positive small vector sector, or in described negative small vector sector, the action time of each vector carries out space vector pulse width modulation.
In the third mode in the cards, in conjunction with the first mode in the cards of second aspect or second aspect, described modulating unit comprises:
Vector modulation unit, for according to ratio synthesis described action time virtual vector;
Second se ctor partition unit, for according to described virtual vector sectorization;
Described time acquisition unit, for obtaining the action time of each vector and described virtual vector except described positive small vector and described negative small vector according to the sector divided according to described virtual vector;
Described time acquisition unit is also for according to described virtual vector, described positive small vector and described negative small vector, and action time of each vector and described virtual vector outside described positive small vector and described negative small vector, the corresponding relation of described virtual vector and described positive small vector and described negative small vector obtains described positive small vector and described negative small vector action time;
Described pulse modulation unit, in a switch periods, according to the action time of each vector in described positive small vector sector, or in described negative small vector sector, the action time of each vector carries out space vector pulse width modulation.
In the 4th kind of mode in the cards, in conjunction with the third mode in the cards of first aspect or first aspect, the corresponding relation of described virtual vector and described positive small vector and described negative small vector comprises:
V
xt
x=V
+t
++ V
-t
-, wherein, V
xrepresent described virtual vector, t
xrepresent the action time of described virtual vector, V
+represent described positive small vector, t
+represent the action time of described positive small vector, V
-represent described negative small vector, t
-represent the action time of described negative small vector.
The embodiment of the present invention provides a kind of space vector pulse width modulation method and modulating equipment, by obtaining the three dimensional vector diagram corresponding with the voltage in switch periods according to the voltage of three-phase inverting circuit in a switch periods, positive small vector sector is obtained according to the positive small vector in three dimensional vector diagram, negative small vector sector is obtained according to the negative small vector in three dimensional vector diagram, and ratio action time of positive small vector sector and negative small vector sector is set, space vector pulse width modulation is carried out according to ratio action time positive small vector sector and negative small vector sector, can in three-level topology in the asymmetric situation of mid-point voltage, space vector pulse width modulation is made to export desirable modulation waveform.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
A kind of space vector pulse width modulation method flow schematic diagram that Fig. 1 provides for the embodiment of the present invention;
A kind of space vector pulse width modulation method flow schematic diagram that Fig. 2 provides for further embodiment of this invention;
A kind of 3 level space vector figure that Fig. 3 provides for further embodiment of this invention;
A kind of space vector sector that Fig. 4 provides for further embodiment of this invention divides schematic diagram;
Another space vector sector that Fig. 5 provides for further embodiment of this invention divides schematic diagram;
Another space vector sector that Fig. 6 provides for further embodiment of this invention divides schematic diagram;
A kind of modulating equipment structural representation that Fig. 7 provides for further embodiment of this invention;
Another modulating equipment structural representation that Fig. 8 provides for further embodiment of this invention;
Another modulating equipment structural representation that Fig. 9 provides for further embodiment of this invention;
A kind of modulating equipment structural representation that Figure 10 provides for further embodiment of this invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The embodiment of the present invention provides a kind of space vector pulse width modulation method, as shown in Figure 1, comprising:
S101, modulating equipment obtain the three dimensional vector diagram corresponding with the voltage in switch periods according to the voltage of three-phase inverting circuit in a switch periods.
Wherein, the output performance of three-level inverter depends primarily on modulation algorithm, due to SVPWM (Space Vector Pulse Width Modulator, space voltage vector modulation) technology is easy to the advantages such as the high and output waveform harmonic content of Digital Implementation, voltage utilization is low, therefore, in three-level inverter circuit, its on off state can be described with three dimensional vector diagram.
In addition, this modulating equipment can be applied to the occasion such as inverter, UPS (Uninterruptible PowerSupply, uninterruptible power supply provider) and SVC (Static Var Compensator, static passive compensation device).
S102, modulating equipment obtain positive small vector sector according to the positive small vector in three dimensional vector diagram, negative small vector sector is obtained according to the negative small vector in three dimensional vector diagram, and ratio action time of positive small vector sector and negative small vector sector is set, positive small vector makes the mid-point voltage of three-phase inverting circuit raise, and described negative small vector makes the mid-point voltage of three-phase inverting circuit reduce.
S103, modulating equipment, according to ratio action time, align small vector sector and negative small vector sector and carry out space vector pulse width modulation.
The embodiment of the present invention provides a kind of space vector pulse width modulation method, by obtaining the three dimensional vector diagram corresponding with the voltage in switch periods according to the voltage of three-phase inverting circuit in a switch periods, positive small vector sector is obtained according to the positive small vector in three dimensional vector diagram, negative small vector sector is obtained according to the negative small vector in three dimensional vector diagram, and ratio action time of positive small vector sector and negative small vector sector is set, space vector pulse width modulation is carried out according to ratio action time positive small vector sector and negative small vector sector, can in three-level topology in the asymmetric situation of mid-point voltage, space vector pulse width modulation is made to export desirable modulation waveform.
Further embodiment of this invention provides a kind of space vector pulse width modulation method, as shown in Figure 2, comprising:
S201, modulating equipment obtain the three dimensional vector diagram corresponding with the voltage in switch periods according to the voltage of three-phase inverting circuit in a switch periods.
Concrete, in three-phase inverting circuit, three-level inverter voltage vector can be divided into large vector, middle vector, small vector and zero vector.Wherein, large vector is 6, and middle vector is 6, and small vector is 12, and zero vector is 3.In a switch periods, during neutral point voltage balance, 3 level space vector figure is full symmetric three dimensional vector diagram, and when mid-point voltage is uneven, its three dimensional vector diagram is complete asymmetric figure, as shown in Figure 3.Figure can change along with the change of mid-point voltage, when imbalance strengthens, the small vector overlapped moves to two pole locations, namely positive small vector is close for the zero point in polar plot, negative small vector is close to the outer ring of polar plot, the corresponding mid-point voltage imbalance that will make inverter circuit in three-phase inverting circuit.
Under extreme case, 3 level space vector becomes two level states.Meanwhile, middle vector also not on the position of symmetry, but offsets to the position of two long vectors.Like this, different vector processing modes, will produce different voltage vector modulating modes.
S202, modulating equipment obtain positive small vector sector according to the positive small vector in three dimensional vector diagram, obtain negative small vector sector according to the negative small vector in three dimensional vector diagram.
Wherein, the task of neutral point voltage balance is exactly control flow check to be zero through the median average electric current of mid point in a control cycle, and what make in each control cycle capacitance voltage is changed to zero.In the impact of each space vector alignment voltage, the impact of different vector alignment voltage is different, wherein, zero vector alignment voltage swing is without impact, the large vector of middle vector is to affect neutral-point voltage balance according to the condition of load, and negative small vector can make mid-point voltage reduce, positive small vector can make mid-point voltage raise, and the output line voltage of often pair of small vector generation is identical, impact for mid-point voltage is contrary, and then the key that mid-point voltage controls adopts suitable small vector to produce balanced capacitor voltage with regard to being.
In order to reduce the harmonic content that inverter exports, three-level inverter generally adopts nearest three Vector modulation modes.First, determine which triangle reference vector is positioned at, can judge which sector reference vector is positioned at according to azimuth information.According to nearest three Vector modulation rules selection space voltage vectors, and calculate the action time of each vector.The voltage vector corresponding to this triangular apex can be selected to carry out synthesized reference vector.Wherein, reference vector can for the purpose of output vector, comprise the vector length that will export and the position in three dimensional vector diagram, correspondence in circuit, the mid-point voltage size that will export exactly and deviation post.
Exemplary, when mid-point voltage is uneven, suppose that the reference vector that will export is arranged in the I sector of complete asymmetric three dimensional vector diagram, I se ctor partition in order to different little sectors, is respectively A sector, B sector, C sector and D sector by the positive and negative small vector do not overlapped.Wherein, V
reffor reference vector, its length is the size of vector, and θ angle is the deviation angle position of reference vector.Concrete, as shown in Figure 4, can first with positive small vector V
1+and V
2+divide I sector, like this, according to nearest three Vector modulation rules, V
refcan by vector V
1+, V
7and V
13synthesize, i.e. summit V
1+, V
7and V
13the vector at place can carry out synthesized reference vector, and the vector switch at its place can affect the balance control of mid-point voltage.Then, as shown in Figure 5, then with negative small vector V
1-and V
2-divide I sector, according to nearest three Vector modulation rules, V
refcan by vector V
0, V
1-and V
2-synthesize, i.e. summit V
0, V
1-and V
2-the vector at place can carry out synthesized reference vector, and the vector switch at its place can affect the balance control of mid-point voltage.
In three-phase inverting circuit, the alternating current exported is mapped in three dimensional vector diagram, in one-period, reference vector rotates in the polar plot of 0 °-360 °, like this, obtains the Vector modulation rule of I sector, the voltage balancing control method of reference vector when I sector can be obtained, in like manner, when reference vector is positioned at other sectors, also can the balance of voltage exported be controlled.
S203, modulating equipment arrange ratio action time of positive small vector sector and negative small vector sector, then perform S204 or S206.
Concrete, after positive small vector divides sector, be used for each vector of synthesized reference vector, can raise by the action time controlling the switch at its place the deviation post that mid-point voltage controls reference vector; After negative small vector divides sector, be used for each vector of synthesized reference vector, the deviation post that mid-point voltage controls reference vector can be reduced by the on-off action time controlling its place, like this, it is different for being used for the impact of different vector alignment voltages of synthesized reference vector, thus just can control the offset direction of mid-point voltage by the ratio controlling vector action time.
S204, modulating equipment, in a switch periods, according to ratio and switch periods action time, obtain the action time of each vector in positive small vector sector; Or, obtain the action time of each vector in negative small vector sector.
Exemplary, when reference vector is positioned at I sector, the action time obtaining each vector of I sector at positive small vector place can obtain in the following manner:
Because reference vector is in I sector, can by vector V
0, V
13and V
14synthesize.Formula one is obtained as follows according to Vector modulation principle:
Wherein, t
13, t
14and t
0represent vector V respectively
0, V
13and V
14action time,
t
sfor switch periods, T represents vector V
0, V
13and V
14the resultant action time, k is modulation ratio, and θ represents the deviation angle position of reference vector.
Like this, vector V can be obtained
0, V
13and V
14action time, then according to three Vector modulation rule, reference vector is taking summit as V
1+, V
13, V
7in the triangular sector of composition, namely can by vector V
1+, V
13, V
7carry out synthesized reference vector, in the α β coordinate system of I sector, vector V
1+, V
13, V
7can by V
13and V
14represent, obtain formula two with this as follows:
Wherein, x
1, y
1represent vector V
1+at V
13, V
14on coordinate, x
2, y
2represent vector V
7at V
13, V
14on coordinate, x
3, y
3represent vector V
13at V
13, V
14on coordinate.
According to formula one and formula two, formula one and formula two are combined equation group and are solved, can obtain:
Wherein, t
i+represent vector V
1+action time, t
7represent vector V
7action time, t
13represent vector V
13action time.
Like this, resultant vector V is obtained
1+, V
13, V
7action time, just can control balance or the skew of mid-point voltage.
Equally, after said method can obtain negative small vector sectorization, according to three Vector modulation rules of reference vector, obtain the action time of each vector.And then, in one-period, when reference vector is positioned at other sectors, behind positive and negative small vector sectorization, the action time of other each vectors of sector can be obtained, control the deviation post of mid-point voltage with this, mid-point voltage can be made in asymmetric situation to control neutral point voltage balance, or control the skew of mid-point voltage.
S205, modulating equipment are according to the action time of each vector in positive small vector sector, or in negative small vector sector, the action time of each vector carries out space vector pulse width modulation.
Concrete, reference vector direction is continually varying, needs the action time constantly obtaining each vector.Switched by multiple switching, utilize space vector of voltage can directly generate three-phase pulse wide modulation waveform.Wherein, the control of unbalance of neutral-point voltage position can obtain with control loop, namely with the deviation post of mid-point voltage for target, with the current location of mid-point voltage for feedback quantity, the deviation post of current midpoint voltage is regulated by the time scale of the output vector of PI (Proportion Integration, proportional integral) control loop.PI controls as Delay control, and P (Proportion, ratio) wherein controls can the deviation of reaction system in proportion, and system is once occur deviation, and proportion adjustment produces regulating action immediately to reduce deviation.Proportional action is large, can accelerate to regulate and reduce error.I (Integration, integration) controls to make system eliminate steady-state error, improves without margin.
S206, modulating equipment are according to ratio synthesis action time virtual vector.
Exemplary, said method is for come sectorization by positive small vector, sectorization is come again by negative small vector, or come sectorization by negative small vector, sectorization is come again by positive small vector, obtain the resultant vector behind sectorization, controlled balance or the skew of mid-point voltage by ratio action time of vector switch corresponding to resultant vector.In addition, also by positive small vector and negative small vector are synthesized a virtual vector in proportion, sectorization can be come by other vectors at virtual vector and place, sector.
Wherein, the corresponding relation of virtual vector and positive small vector and negative small vector can comprise: V
xt
x=V
+t
++ V
-t
-, wherein, V
xrepresent virtual vector, t
xrepresent the action time of virtual vector, V
+represent positive small vector, t
+represent the action time of positive small vector, V
-represent negative small vector, t
-represent the action time of negative small vector.
S207, modulating equipment are according to virtual vector sectorization.
Exemplary, as shown in Figure 6, if reference vector is arranged in the I sector of complete asymmetric three dimensional vector diagram, virtual vector V
xsame with other small vectors can be A sector, B sector, C sector and D sector by I se ctor partition.When reference vector is positioned at C sector, can by obtaining V
2x, V
1xand V
7vector control balance or the skew of mid-point voltage action time.Like this, sector only once divides, and can simplify modulation algorithm, can control balance or the skew of mid-point voltage equally.
S208, modulating equipment obtain the action time of each vector and virtual vector except positive small vector and negative small vector according to the sector divided according to virtual vector.
Concrete, in the middle of modulation algorithm, virtual vector is only used to simplify modulation algorithm, and in the middle of the operation of side circuit, virtual vector does not exist the vector switch corresponding with it.In reality, can according to be used for synthesizing the positive and negative small vector corresponding to virtual vector divide after each vector action time ratio to carry out the balance of mid-point voltage or skew, its modulation algorithm and S204 similar, repeat no more.
S209, modulating equipment are according to virtual vector, positive small vector and negative small vector, and action time of each vector and virtual vector outside positive small vector and negative small vector, the corresponding relation of virtual vector and positive small vector and negative small vector obtains positive small vector and negative small vector action time.
Wherein, can according to the corresponding relation V of virtual vector and positive small vector and negative small vector
xt
x=V
+t
++ V
-t
-, obtain V
1xt
1x=V
1+v
1+v
1-t
1-, V
2xt
2x=V
2+t
2++ V
2-t
2-.Wherein, V
xrepresent virtual vector, V
1xrepresent virtual positive vector, V
2xrepresent virtual negative vector, t
xrepresent the action time of virtual vector, t
1xrepresent the action time of virtual positive vector, t
2xrepresent the action time of virtual negative vector.
S210, modulating equipment are in a switch periods, and according to the action time of each vector in positive small vector sector, or in negative small vector sector, the action time of each vector carries out space vector pulse width modulation.
In sum, in three-phase inverting circuit, when mid-point voltage is asymmetric, when cannot export desirable modulation waveform, corresponding in complete asymmetric 3 level space vector figure, in a switch periods, the pulse width modulation of space vector can be carried out by ratio action time of the action time of positive small vector and negative small vector, map with each control switch of three-phase inverting circuit, can by controlling the ratio and sequence of operation action time of each switch, to export balanced voltage, balanced voltage can be obtained by this modulation algorithm to control, obtain correct output waveform, to export unbalance voltage, variation can be obtained by this modulation algorithm and controlling, correct output waveform can be obtained equally, make space vector pulse width modulation can export desirable modulation waveform.
It should be noted that, this modulation algorithm can be applied to the space vector pulse width modulation of three-phase tri-level inverter circuit, also can apply but be not limited in I type three-level inverter circuit and T-shaped three-level inverter circuit.
The embodiment of the present invention provides a kind of space vector pulse width modulation method, by obtaining the three dimensional vector diagram corresponding with the voltage in switch periods according to the voltage of three-phase inverting circuit in a switch periods, positive small vector sector is obtained according to the positive small vector in three dimensional vector diagram, negative small vector sector is obtained according to the negative small vector in three dimensional vector diagram, and ratio action time of positive small vector sector and negative small vector sector is set, space vector pulse width modulation is carried out according to ratio action time positive small vector sector and negative small vector sector, can in three-level topology in the asymmetric situation of mid-point voltage, space vector pulse width modulation is made to export desirable modulation waveform.
Further embodiment of this invention provides a kind of modulating equipment 01, as shown in Figure 7, comprising:
Polar plot acquiring unit 011, for obtaining the three dimensional vector diagram corresponding with the voltage in switch periods according to the voltage of three-phase inverting circuit in a switch periods.
First sector acquiring unit 012, for obtaining positive small vector sector according to the positive small vector in three dimensional vector diagram, negative small vector sector is obtained according to the negative small vector in three dimensional vector diagram, and ratio action time of positive small vector sector and negative small vector sector is set, positive small vector makes the mid-point voltage of three-phase inverting circuit raise, and described negative small vector makes the mid-point voltage of three-phase inverting circuit reduce.
Modulating unit 013, for according to ratio action time, aligns small vector sector and negative small vector sector and carries out space vector pulse width modulation.
Further, when arranging ratio action time of positive small vector sector and negative small vector sector, the first se ctor partition unit 012 can be specifically for:
Be arranged on when carrying out space vector pulse width modulation, the ratio of switch periods number shared by switch periods number shared by positive small vector sector and negative small vector sector.
Further, as shown in Figure 8, modulating unit 013 can comprise:
Time acquisition unit 0131, in a switch periods, according to ratio and switch periods action time, obtains the action time of each vector in positive small vector sector; Or, obtain the action time of each vector in negative small vector sector;
Pulse modulation unit 0132, for the action time according to each vector in positive small vector sector, or in negative small vector sector, the action time of each vector carries out space vector pulse width modulation.
Further, as shown in Figure 9, modulating unit 013 can comprise:
Vector modulation unit 0133, for synthesizing virtual vector according to ratio action time.
Second se ctor partition unit 0134, for according to virtual vector sectorization.
Time acquisition unit 0131, for obtaining the action time of each vector and virtual vector except positive small vector and negative small vector according to the sector divided according to virtual vector.
Time acquisition unit 0131 is also for according to virtual vector, positive small vector and negative small vector, and action time of each vector and virtual vector outside positive small vector and negative small vector, the corresponding relation of virtual vector and positive small vector and negative small vector obtains positive small vector and negative small vector action time.
Pulse modulation unit 0132, in a switch periods, according to the action time of each vector in positive small vector sector, or in negative small vector sector, the action time of each vector carries out space vector pulse width modulation.
Further, the corresponding relation of virtual vector and positive small vector and negative small vector can comprise:
V
xt
x=V
+t
++ V
-t
-, wherein, Vx represents virtual vector, t
xrepresent the action time of virtual vector, V
+represent positive small vector, t
+represent the action time of positive small vector, V
-represent negative small vector, t
-represent the action time of negative small vector.
The embodiment of the present invention provides a kind of modulating equipment, by obtaining the three dimensional vector diagram corresponding with the voltage in switch periods according to the voltage of three-phase inverting circuit in a switch periods, positive small vector sector is obtained according to the positive small vector in three dimensional vector diagram, negative small vector sector is obtained according to the negative small vector in three dimensional vector diagram, and ratio action time of positive small vector sector and negative small vector sector is set, space vector pulse width modulation is carried out according to ratio action time positive small vector sector and negative small vector sector, can in three-level topology in the asymmetric situation of mid-point voltage, space vector pulse width modulation is made to export desirable modulation waveform.
Further embodiment of this invention provides a kind of modulating equipment 02, and as shown in Figure 10, this equipment 02 comprises:
Processor (processor) 021, communication interface (Communications Interface) 022, memory (Memory) 023, control bus 024.
Processor 021, communication interface 022, memory 023 completes mutual communication by control bus 024.
Communication interface 022, for net element communication.
Processor 021, for executive program 025, specifically can perform the correlation step in the embodiment of the method shown in above-mentioned Fig. 1 or Fig. 2.
Sampling unit 026, with inversion unit 027, sampling unit 026 is for the data message of the data message and voltage that obtain the electric current of external electrical network, and inversion unit 027 is for performing this Output rusults of target vector in space vector pulse width modulation, and formation control loop obtains output voltage values.
Particularly, program 025 can comprise program code, and described program code comprises computer-managed instruction.
Processor 021 may be a central processor CPU, or specific integrated circuit ASIC (Application Specific Integrated Circuit), or is configured to the one or more integrated circuits implementing the embodiment of the present invention.
Memory 023, for depositing program 025.Memory 023 may comprise high-speed RAM memory, still may comprise nonvolatile memory (non-volatile memory), such as at least one magnetic disc store.Program 025 specifically can comprise:
The three dimensional vector diagram corresponding with the voltage in switch periods is obtained according to the voltage of three-phase inverting circuit in a switch periods;
Positive small vector sector is obtained according to the positive small vector in three dimensional vector diagram, negative small vector sector is obtained according to the negative small vector in three dimensional vector diagram, and ratio action time of positive small vector sector and negative small vector sector is set, positive small vector makes the mid-point voltage of three-phase inverting circuit raise, and described negative small vector makes the mid-point voltage of three-phase inverting circuit reduce;
According to ratio action time, align small vector sector and negative small vector sector and carry out space vector pulse width modulation.
In program 025 each module specific implementation can see Fig. 7, Fig. 8 and embodiment illustrated in fig. 9 in corresponding module, be not repeated herein.
The embodiment of the present invention provides a kind of modulating equipment, by obtaining the three dimensional vector diagram corresponding with the voltage in switch periods according to the voltage of three-phase inverting circuit in a switch periods, positive small vector sector is obtained according to the positive small vector in three dimensional vector diagram, negative small vector sector is obtained according to the negative small vector in three dimensional vector diagram, and ratio action time of positive small vector sector and negative small vector sector is set, space vector pulse width modulation is carried out according to ratio action time positive small vector sector and negative small vector sector, can in three-level topology in the asymmetric situation of mid-point voltage, space vector pulse width modulation is made to export desirable modulation waveform.
In several embodiments that the application provides, should be understood that disclosed equipment and method can realize by another way.Such as, apparatus embodiments described above is only schematic, such as, the division of described unit, be only a kind of logic function to divide, actual can have other dividing mode when realizing, such as multiple unit or assembly can in conjunction with or another system can be integrated into, or some features can be ignored, or do not perform.Another point, shown or discussed connection each other can be by some interfaces, can be electric, machinery or other form.
In addition, in the equipment in each embodiment of the present invention and system, each functional unit can be integrated in a processing unit, also can be that the independent physics of unit comprises, also can two or more unit in a unit integrated.And above-mentioned each unit both can adopt the form of hardware to realize, the form that hardware also can be adopted to add SFU software functional unit had realized.
The all or part of step realizing said method embodiment can have been come by the hardware that program command is relevant, and aforesaid program can be stored in a computer read/write memory medium, and this program, when performing, performs the step comprising said method embodiment; And aforesaid storage medium comprises: USB flash disk, portable hard drive, read-only memory (Read Only Memory, be called for short ROM), random access memory (Random Access Memory, be called for short RAM), magnetic disc or CD etc. various can be program code stored medium.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of described claim.
Claims (4)
1. a space vector pulse width modulation method, is characterized in that, comprising:
The three dimensional vector diagram corresponding with the voltage in described switch periods is obtained according to the voltage of three-phase inverting circuit in a switch periods;
Positive small vector sector is obtained according to the positive small vector in described three dimensional vector diagram, negative small vector sector is obtained according to the negative small vector in described three dimensional vector diagram, and ratio action time of described positive small vector sector and described negative small vector sector is set, described positive small vector makes the mid-point voltage of described three-phase inverting circuit raise, and described negative small vector makes the mid-point voltage of described three-phase inverting circuit reduce;
According to described ratio synthesis action time virtual vector;
According to described virtual vector sectorization;
The action time of each vector and the action time of described virtual vector except described positive small vector and described negative small vector is obtained according to the sector divided according to described virtual vector;
According to described positive small vector and described negative small vector, described virtual vector, and the action time of each vector and the action time of described virtual vector outside described positive small vector and described negative small vector, the corresponding relation of described virtual vector and described positive small vector and described negative small vector obtains described positive small vector and described negative small vector action time;
In a switch periods, according to the action time of each vector in described positive small vector sector, or in described negative small vector sector, the action time of each vector carries out space vector pulse width modulation;
Wherein, the corresponding relation of described virtual vector and described positive small vector and described negative small vector comprises:
V
xt
x=V
+t
++ V
-t
-, wherein, V
xrepresent described virtual vector, t
xrepresent the action time of described virtual vector, V
+represent described positive small vector, t
+represent the action time of described positive small vector, V
-represent described negative small vector, t
-represent the action time of described negative small vector.
2. method according to claim 1, is characterized in that, described ratio action time arranging described positive small vector sector and described negative small vector sector comprises:
Be arranged on when carrying out space vector pulse width modulation, the ratio of switch periods number shared by switch periods number shared by described positive small vector sector and described negative small vector sector.
3. a modulating equipment, is characterized in that, comprising:
Polar plot acquiring unit, for obtaining the three dimensional vector diagram corresponding with the voltage in described switch periods according to the voltage of three-phase inverting circuit in a switch periods;
First sector acquiring unit, for obtaining positive small vector sector according to the positive small vector in described three dimensional vector diagram, negative small vector sector is obtained according to the negative small vector in described three dimensional vector diagram, and ratio action time of described positive small vector sector and described negative small vector sector is set, described positive small vector makes the mid-point voltage of described three-phase inverting circuit raise, and described negative small vector makes the mid-point voltage of described three-phase inverting circuit reduce;
Vector modulation unit, for according to ratio synthesis described action time virtual vector;
Second se ctor partition unit, for according to described virtual vector sectorization;
Time acquisition unit, for obtaining the action time of each vector and the action time of described virtual vector except described positive small vector and described negative small vector according to the sector divided according to described virtual vector;
Described time acquisition unit is also for according to described virtual vector, described positive small vector and described negative small vector, and the action time of each vector and the action time of described virtual vector outside described positive small vector and described negative small vector, the corresponding relation of described virtual vector and described positive small vector and described negative small vector obtains described positive small vector and described negative small vector action time;
Pulse modulation unit, in a switch periods, according to the action time of each vector in described positive small vector sector, or in described negative small vector sector, the action time of each vector carries out space vector pulse width modulation;
Wherein, the corresponding relation of described virtual vector and described positive small vector and described negative small vector comprises:
V
xt
x=V
+t
++ V
-t
-, wherein, V
xrepresent described virtual vector, t
xrepresent the action time of described virtual vector, V
+represent described positive small vector, t
+represent the action time of described positive small vector, V
-represent described negative small vector, t
-represent the action time of described negative small vector.
4. equipment according to claim 3, is characterized in that, when arranging ratio action time of described positive small vector sector and described negative small vector sector, described first sector acquiring unit specifically for:
Be arranged on when carrying out space vector pulse width modulation, the ratio of switch periods number shared by switch periods number shared by described positive small vector sector and described negative small vector sector.
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