CN103095166A - Modulating method and modulating equipment of space vector pulse width - Google Patents

Modulating method and modulating equipment of space vector pulse width Download PDF

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CN103095166A
CN103095166A CN2013100374804A CN201310037480A CN103095166A CN 103095166 A CN103095166 A CN 103095166A CN 2013100374804 A CN2013100374804 A CN 2013100374804A CN 201310037480 A CN201310037480 A CN 201310037480A CN 103095166 A CN103095166 A CN 103095166A
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vector
sector
small vector
action time
negative small
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CN103095166B (en
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徐运燕
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Huawei Digital Power Technologies Co Ltd
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Huawei Technologies Co Ltd
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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

A kind of space vector pulse width modulation method and modulating equipment
Technical field
The present invention relates to control field, relate in particular to a kind of space vector pulse width modulation method and modulating equipment.
Background technology
In three-phase inverting circuit, three level topologys have been widely used in the occasions such as frequency converter, uninterruptible power supply provider, power factor correction, Static Var Compensator.SVPWM (Space Vector PWM, space vector pulse width modulation) modulation technique also is widely applied in three level topologys.In existing SVPWM modulation, the mid-point voltage symmetry is its main feature.The characteristics of symmetrical 3 level space vector are that the three dimensional vector diagram symmetry is very good, and each vector triangle is equilateral triangle, and each sector is 60 ° of symmetries, can export desirable modulation waveform.If mid-point voltage is asymmetric, can't 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 topologys, in case uneven, will produce the error of calculation, output waveform will produce distortion.In more serious situation, mid-point voltage is asymmetric, and calculating will produce gross error, and output SVPWM waveform will seriously distort.Traditional SVPWM modulation technique has utilized the characteristics of symmetric figure to complete the calculating of each vector action time just, and traditional algorithm can't be applied in the unbalanced occasion of mid-point voltage.
In addition, generally, in actual applications, algorithm must increase neutral point voltage balance and control.Be the perfect symmetry figure owing to requiring three dimensional vector diagram, inevitable requirement neutral point voltage balance control algolithm responds fast, and is higher to hardware requirement simultaneously, for example capacitance just required greatly.Due to the hysteresis of control system, particularly under the condition of system's dynamic change, the mid-point voltage imbalance can cause output waveform seriously to distort, and directly affects neutral point voltage balance and controls.
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 topologys in the asymmetric situation of mid-point voltage, make the desirable modulation waveform of space vector pulse width modulation output.
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:
Obtain the three dimensional vector diagram corresponding with voltage in described switch periods according to the voltage of three-phase inverting circuit in a switch periods;
Obtain positive small vector sector according to the positive small vector in described three dimensional vector diagram, obtain negative small vector sector 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 action time of ratio, space vector pulse width modulation is carried out in 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 that described positive small vector sector and described negative small vector sector are set comprises:
Be arranged on when carrying out space vector pulse width modulation the ratio of the shared switch periods number of the shared switch periods number in described positive small vector sector and described negative small vector sector.
In the second mode in the cards, in conjunction with the first of first aspect or first aspect mode in the cards, described according to described action time of ratio, space vector pulse width modulation is carried out in described positive small vector sector and described negative small vector sector comprise:
In a switch periods, according to described action time ratio and described switch periods, obtain the action time of each vector in described positive small vector sector; Perhaps, 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, perhaps, in described negative small vector sector, carry out space vector pulse width modulation the action time of each vector.
In the third mode in the cards, in conjunction with the first of first aspect or first aspect mode in the cards, described according to described action time of ratio, space vector pulse width modulation is carried out in described positive small vector sector and described negative small vector sector comprise:
According to the synthetic virtual vector of described ratio action time;
According to described virtual vector sectorization;
Obtain the action time of except described positive small vector and described negative small vector each vector and described virtual vector according to the sector of dividing 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, perhaps, in described negative small vector sector, carry out space vector pulse width modulation the action time of each vector.
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 xThe action time that represents described virtual vector, V +Represent described positive small vector, t +The action time that represents described positive small vector, V -Represent described negative small vector, t -The action time that represents described negative small vector.
Second aspect provides a kind of equipment, comprising:
The polar plot acquiring unit is used for obtaining the three dimensional vector diagram corresponding with voltage in described switch periods according to the voltage of three-phase inverting circuit in a switch periods;
The first sector acquiring unit, be used for positive small vector according to described three dimensional vector diagram and obtain positive small vector sector, obtain negative small vector sector 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 is used for according to described action time of ratio, and space vector pulse width modulation is carried out in described positive small vector sector and described negative small vector sector.
In the first mode in the cards, in conjunction with second aspect, during ratio, described the first sector division unit specifically is used in the action time that described positive small vector sector and described negative small vector sector are set:
Be arranged on when carrying out space vector pulse width modulation the ratio of the shared switch periods number of the shared switch periods number in described positive small vector sector and described negative small vector sector.
In the second mode in the cards, in conjunction with the first of second aspect or second aspect mode in the cards, described modulating unit comprises:
Time acquisition unit is used in a switch periods, according to described action time ratio and described switch periods, obtains the action time of each vector in described positive small vector sector; Perhaps, obtain the action time of each vector in described negative small vector sector;
Pulse modulation unit is used for the action time according to each vector of described positive small vector sector, and perhaps, in described negative small vector sector, carry out space vector pulse width modulation the action time of each vector.
In the third mode in the cards, in conjunction with the first of second aspect or second aspect mode in the cards, described modulating unit comprises:
The vector synthesis unit is used for according to the synthetic virtual vector of described ratio action time;
The second sector division unit is used for according to described virtual vector sectorization;
Described time acquisition unit is used for obtaining according to the sector of dividing according to described virtual vector action time of except described positive small vector and described negative small vector each vector and described virtual vector;
Described time acquisition unit also is used 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 is used in a switch periods, and according to the action time of each vector in described positive small vector sector, perhaps, in described negative small vector sector, carry out space vector pulse width modulation the action time of each vector.
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 xThe action time that represents described virtual vector, V +Represent described positive small vector, t +The action time that represents described positive small vector, V -Represent described negative small vector, t -The action time that represents described negative small vector.
the embodiment of the present invention provides a kind of space vector pulse width modulation method and modulating equipment, by obtain the three dimensional vector diagram corresponding with voltage in switch periods according to the voltage of three-phase inverting circuit in a switch periods, 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, and ratio action time of positive small vector sector and negative small vector sector is set, carry out space vector pulse width modulation according to ratio action time positive small vector sector and negative small vector sector, can be in three level topologys in the asymmetric situation of mid-point voltage, make the desirable modulation waveform of space vector pulse width modulation output.
Description of drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or description of the Prior Art, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
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;
Fig. 4 divides schematic diagram for a kind of space vector sector that further embodiment of this invention provides;
Fig. 5 divides schematic diagram for another space vector sector that further embodiment of this invention provides;
Fig. 6 divides schematic diagram for another space vector sector that further embodiment of this invention provides;
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, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
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 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, the advantages such as space voltage vector modulation) technology is easy to Digital Implementation, voltage utilization is high and the output waveform harmonic content is low, therefore in the three-level inverter circuit, its on off state can describe with three dimensional vector diagram.
In addition, this modulating equipment can be applied to the occasions such as inverter, UPS (Uninterruptible Power Supply, 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, obtain negative small vector sector 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 be according to ratio action time, aligns 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 obtain the three dimensional vector diagram corresponding with voltage in switch periods according to the voltage of three-phase inverting circuit in a switch periods, 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, and ratio action time of positive small vector sector and negative small vector sector is set, carry out space vector pulse width modulation according to ratio action time positive small vector sector and negative small vector sector, can be in three level topologys in the asymmetric situation of mid-point voltage, make the desirable modulation waveform of space vector pulse width modulation output.
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 voltage in switch periods according to the voltage of three-phase inverting circuit in a switch periods.
Concrete, in three-phase inverting circuit, the 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 the full symmetric three dimensional vector diagram, and when mid-point voltage was uneven, its three dimensional vector diagram was complete asymmetric figure, as shown in Figure 3.Figure can change along with the variation of mid-point voltage, when imbalance strengthens, the small vector that overlaps moves to two pole locations, be that positive small vector is close to the zero point in polar plot, negative small vector is close to the outer ring of polar plot, and the corresponding mid-point voltage of inverter circuit that will make in three-phase inverting circuit is uneven.
Under extreme case, 3 level space vector becomes two level states.Simultaneously, middle vector is not also on the position of symmetry, but to the position skew 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 be exactly the median average electric current that will control the mid point of flowing through in a control cycle be zero, 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 that the condition according to load affects neutral point voltage balance and controls, and negative small vector can be so that mid-point voltage reduces, positive small vector can be so that mid-point voltage raises, and the output line voltage of every pair of small vector generation is identical, impact for mid-point voltage is opposite, and then the key that mid-point voltage is controlled adopts suitable small vector to produce balancing capacitance voltage with regard to being.
In order to reduce the harmonic content of inverter output, three-level inverter generally adopts nearest three vector synthesis modes.At first, determine which triangle reference vector is positioned at, can judge according to azimuth information which sector reference vector is positioned at.Select space voltage vector according to nearest three vector composition rules, and the action time of calculating each vector.Can select the corresponding voltage vector of this triangular apex to come the synthesized reference vector.Wherein, reference vector can be the purpose output vector, comprises the vector length that will export and the position in three dimensional vector diagram, and is corresponding in circuit, mid-point voltage size and the deviation post that will export exactly.
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, the positive and negative small vector that does not overlap divides the I sector for different little sectors, is respectively A sector, B sector, C sector and D sector.Wherein, V refBe reference vector, its length is the size of vector, and the θ angle is the deviation angle position of reference vector.Concrete, as shown in Figure 4, can be first with positive small vector V 1+And V 2+Divide the I sector, like this, according to nearest three vector composition rules, V refCan be by vector V 1+, V 7And V 13Synthesize, i.e. summit V 1+, V 7And V 13The vector at place can come the synthesized reference vector, and the vector switch at its place can affect the balance of mid-point voltage and control.Then, as shown in Figure 5, then with negative small vector V 1-And V 2-Divide the I sector, according to nearest three vector composition rules, V refCan be 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 come the synthesized reference vector, and the vector switch at its place can affect the balance of mid-point voltage and control.
In three-phase inverting circuit, the alternating current of output is mapped in three dimensional vector diagram, in one-period, reference vector rotates in the polar plot of 0 °-360 °, like this, has obtained the vector composition rule of I sector, can obtain the balance of voltage control method of reference vector when the I sector, in like manner, when reference vector is positioned at other sectors, also can control the balance of voltage of output.
S203, modulating equipment arrange ratio action time of positive small vector sector and negative small vector sector, then carry out S204 or S206.
Concrete, after positive small vector is being divided the sector, be used for each vector of synthesized reference vector, the mid-point voltage that can raise the action time of the switch by controlling its place is controlled the deviation post of reference vector; After negative small vector is divided the sector, be used for each vector of synthesized reference vector, can reduce the deviation post that mid-point voltage is controlled reference vector by the on-off action time of controlling its place, like this, it is different being used for the impact of different vector alignment voltages of synthesized reference vector, thereby just can control the offset direction of mid-point voltage by the ratio of controlling vector action time.
S204, modulating equipment according to action time ratio and switch periods, obtain the action time of each vector in positive small vector sector in a switch periods; Perhaps, obtain the action time of each vector in negative small vector sector.
Exemplary, when reference vector was positioned at the I sector, can obtain in the following manner the action time of obtaining each vector of I sector at positive small vector place:
Due to reference vector in the I sector, can be by vector V 0, V 13And V 14Come synthetic.Obtain formula one according to the vector composition principle as follows:
t 13 = kT sin ( π 3 - θ ) t 14 = kT sin ( θ ) t 0 = T - t 13 - t 13
Wherein, t 13, t 14And t 0Represent respectively vector V 0, V 13And V 14Action time,
Figure BDA00002797405300092
T sBe switch periods, T represents vector V 0, V 13And V 14The resultant action time, k is modulation ratio, θ represents the deviation angle position of reference vector.
Like this, can obtain vector V 0, V 13And V 14Action time, then according to three vector composition rules, reference vector is taking on the summit as V 1+, V 13, V 7In the triangular sector that forms, namely can be by vector V 1+, V 13, V 7Come the synthesized reference vector, in the α β coordinate system of I sector, vector V 1+, V 13, V 7Can be by V 13And V 14Represent, obtain formula two with this as follows:
V 1 + = x 1 V 13 + y 1 V 14 V 7 = x 2 V 13 + y 2 V 14 V 13 = x 3 V 13 + y 3 V 14
Wherein, x 1, y 1The expression vector V 1+At V 13, V 14On coordinate, x 2, y 2The expression vector V 7At V 13, V 14On coordinate, x 3, y 3The expression vector V 13At V 13, V 14On coordinate.
According to formula one and formula two, formula one and formula two are united equation group and found the solution, can obtain:
t 1 + t 7 t 13 = t 13 t 14 T x 1 x 2 x 3 y 1 y 2 y 3 1 1 1 - 1
Wherein, t i+The expression vector V 1+Action time, t 7The expression vector V 7Action time, t 13The expression vector V 13Action time.
Like this, obtained resultant vector V 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 composition rules of reference vector, the action time of obtaining each vector.And then, in one-period, when reference vector is positioned at other sectors, after positive and negative small vector sectorization, can obtain the action time of other each vectors of sector, control the deviation post of mid-point voltage with this, can so that mid-point voltage is controlled neutral point voltage balance in asymmetric situation, perhaps control the skew of mid-point voltage.
S205, modulating equipment be according to the action time of each vector in positive small vector sector, and perhaps, in negative small vector sector, carry out space vector pulse width modulation the action time of each vector.
Concrete, the reference vector direction is continually varying, need to constantly obtain the action time of each vector.Switch by multiple switching, utilize space vector of voltage can directly generate three-phase pulse width modulated waveform.Wherein, the control of unbalance of neutral-point voltage position can be obtained with control loop, namely take the deviation post of mid-point voltage as target, take the current location of mid-point voltage as feedback quantity, the time scale of the output vector by PI (Proportion Integration, proportional integral) control loop is regulated the deviation post of current mid-point voltage.PI is controlled to be to lag behind and controls, and P wherein (Proportion, ratio) controls the deviation of reaction system in proportion, and in a single day deviation has appearred in system, and the ratio adjusting produces immediately regulating action and reduces deviation.Proportional action is large, can accelerate to regulate and reduce error.I (Integration, integration) controls and can make system eliminate steady-state error, improves without margin.
S206, modulating equipment are according to the synthetic virtual vector of ratio action time.
Exemplary, said method is for to come sectorization by positive small vector, come sectorization by negative small vector again, perhaps come sectorization by negative small vector, come sectorization by positive small vector again, obtain the resultant vector after sectorization, control balance or the skew of mid-point voltage by ratio action time of vector switch corresponding to resultant vector.In addition, also can be by with positive small vector and negative small vector synthetic virtual vector in proportion, other vectors by virtual vector and place, sector come sectorization.
Wherein, virtual vector can comprise with the corresponding relation of positive small vector and negative small vector: V xt x=V +t ++ V -t -, wherein, V xThe expression virtual vector, t xThe action time of expression virtual vector, V +Represent positive small vector, t +The action time that represents positive small vector, V -The negative small vector of expression, t -The action time of the negative small vector of expression.
S207, modulating equipment are according to the 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 xThe I sector can be divided into equally A sector, B sector, C sector and D sector with other small vectors.When reference vector is positioned at the C sector, can be by obtaining V 2x, V 1xAnd V 7Vector control balance or the skew of mid-point voltage action time.Like this, the sector is only once divided, and can simplify modulation algorithm, can control equally balance or the skew of mid-point voltage.
S208, modulating equipment obtain the action time of except positive small vector and negative small vector each vector and virtual vector according to the sector of dividing according to virtual vector.
Concrete, in the middle of modulation algorithm, virtual vector just is used for simplifying modulation algorithm, and in the middle of the operation of side circuit, there be not the vector switch corresponding with it in virtual vector.In reality, can carry out the balance of mid-point voltage or skew according to being used for ratio action time of each vector of the synthetic corresponding positive and negative small vector of virtual vector after dividing, its modulation algorithm and S204 are 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 be according to the corresponding relation V of virtual vector with 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 xThe expression virtual vector, V 1xRepresent virtual positive vector, V 2xExpression virtual negative vector, t xThe action time of expression virtual vector, t 1xThe action time that represents virtual positive vector, t 2xThe action time of expression 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, perhaps, in negative small vector sector, carry out space vector pulse width modulation the action time of each vector.
in sum, in three-phase inverting circuit, when mid-point voltage asymmetric, in the time of can't exporting desirable modulation waveform, corresponding in complete asymmetric 3 level space vector figure, in a switch periods, can carry out the pulse width modulation of space vector by the action time of positive small vector and ratio action time of negative small vector, each control switch mapping with three-phase inverting circuit, can be by controlling the ratio and sequence of operation action time of each switch, if export balanced voltage, can obtain balanced voltage by this modulation algorithm controls, obtain correct output waveform, if export unbalance voltage, can obtain variation by this modulation algorithm and control, can obtain correct output waveform equally, make space vector pulse width modulation can export desirable modulation waveform.
Need to prove, this modulation algorithm can be applied to the space vector pulse width modulation of three-phase tri-level inverter circuit, also can use but be not limited in I type tri-level inversion circuit and T-shaped tri-level inversion circuit.
the embodiment of the present invention provides a kind of space vector pulse width modulation method, by obtain the three dimensional vector diagram corresponding with voltage in switch periods according to the voltage of three-phase inverting circuit in a switch periods, 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, and ratio action time of positive small vector sector and negative small vector sector is set, carry out space vector pulse width modulation according to ratio action time positive small vector sector and negative small vector sector, can be in three level topologys in the asymmetric situation of mid-point voltage, make the desirable modulation waveform of space vector pulse width modulation output.
Further embodiment of this invention provides a kind of modulating equipment 01, as shown in Figure 7, comprising:
Polar plot acquiring unit 011 is used for obtaining the three dimensional vector diagram corresponding with voltage in switch periods according to the voltage of three-phase inverting circuit in a switch periods.
The first sector acquiring unit 012, be used for positive small vector according to three dimensional vector diagram and obtain positive small vector sector, obtain negative small vector sector 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 is used for according to ratio action time, aligns small vector sector and negative small vector sector and carries out space vector pulse width modulation.
Further, during ratio, the first sector division unit 012 can specifically be used in the action time that positive small vector sector and negative small vector sector are set:
Be arranged on when carrying out space vector pulse width modulation the ratio of the positive shared switch periods number in small vector sector and the shared switch periods number in negative small vector sector.
Further, as shown in Figure 8, modulating unit 013 can comprise:
Time acquisition unit 0131 is used in a switch periods, according to action time ratio and switch periods, obtains the action time of each vector in positive small vector sector; Perhaps, obtain the action time of each vector in negative small vector sector;
Pulse modulation unit 0132 is used for the action time according to each vector of positive small vector sector, and perhaps, in negative small vector sector, carry out space vector pulse width modulation the action time of each vector.
Further, as shown in Figure 9, modulating unit 013 can comprise:
Vector synthesis unit 0133 is used for according to the synthetic virtual vector of ratio action time.
The second sector division unit 0134 is used for according to the virtual vector sectorization.
Time acquisition unit 0131 is used for obtaining according to the sector of dividing according to virtual vector action time of except positive small vector and negative small vector each vector and virtual vector.
Time acquisition unit 0131 also is used 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 is used in a switch periods, and according to the action time of each vector in positive small vector sector, perhaps, in negative small vector sector, carry out space vector pulse width modulation the action time of each vector.
Further, virtual vector can comprise with the corresponding relation of positive small vector and negative small vector:
V xt x=V +t ++ V -t -, wherein, Vx represents virtual vector, t xThe action time of expression virtual vector, V +Represent positive small vector, t +The action time that represents positive small vector, V -The negative small vector of expression, t -The action time of the negative small vector of expression.
the embodiment of the present invention provides a kind of modulating equipment, by obtain the three dimensional vector diagram corresponding with voltage in switch periods according to the voltage of three-phase inverting circuit in a switch periods, 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, and ratio action time of positive small vector sector and negative small vector sector is set, carry out space vector pulse width modulation according to ratio action time positive small vector sector and negative small vector sector, can be in three level topologys in the asymmetric situation of mid-point voltage, make the desirable modulation waveform of space vector pulse width modulation output.
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 is completed mutual communication by control bus 024.
Communication interface 022 is used for and net element communication.
Processor 021 is used for executive program 025, specifically can carry out the correlation step in above-mentioned Fig. 1 or embodiment of the method shown in Figure 2.
Sampling unit 026, with inversion unit 027, sampling unit 026 is for the data message of the electric current that obtains external electrical network and the data message of voltage, and inversion unit 027 is used for carrying out this Output rusults of space vector pulse width modulation target vector, and the 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 implement one or more integrated circuits of the embodiment of the present invention.
Memory 023 is used for depositing program 025.Memory 023 may comprise the high-speed RAM memory, also may also comprise nonvolatile memory (non-volatile memory), for example at least one magnetic disc store.Program 025 specifically can comprise:
Obtain the three dimensional vector diagram corresponding with voltage in switch periods according to the voltage of three-phase inverting circuit in a switch periods;
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, 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 specific implementation of each module can referring to 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 obtain the three dimensional vector diagram corresponding with voltage in switch periods according to the voltage of three-phase inverting circuit in a switch periods, 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, and ratio action time of positive small vector sector and negative small vector sector is set, carry out space vector pulse width modulation according to ratio action time positive small vector sector and negative small vector sector, can be in three level topologys in the asymmetric situation of mid-point voltage, make the desirable modulation waveform of space vector pulse width modulation output.
In several embodiment that the application provides, should be understood that disclosed equipment and method can realize by another way.For example, apparatus embodiments described above is only schematic, for example, the division of described unit, be only that a kind of logic function is divided, during actual the realization, other dividing mode can be arranged, for example a plurality of unit or assembly can in conjunction with or can be integrated into another system, or some features can ignore, or do not carry out.Another point, shown or discussed connection each other can be by some interfaces, can be electric, machinery or other form.
In addition, in equipment and system in each embodiment of the present invention, each functional unit can be integrated in a processing unit, can be also that the independent physics of unit comprises, also can be integrated in a unit two or more unit.And each above-mentioned unit both can adopt the form of hardware to realize, the form that also can adopt hardware to add SFU software functional unit realizes.
Realize that all or part of step of said method embodiment can complete by the hardware that program command is correlated with, aforesaid program can be stored in a computer read/write memory medium, and this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: USB flash disk, portable hard drive, read-only memory (Read Only Memory, abbreviation ROM), the various media that can be program code stored such as random access memory (Random Access Memory is called for short RAM), magnetic disc or CD.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, within all should being encompassed in 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 (10)

1. a space vector pulse width modulation method, is characterized in that, comprising:
Obtain the three dimensional vector diagram corresponding with voltage in described switch periods according to the voltage of three-phase inverting circuit in a switch periods;
Obtain positive small vector sector according to the positive small vector in described three dimensional vector diagram, obtain negative small vector sector 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 action time of ratio, space vector pulse width modulation is carried out in described positive small vector sector and described negative small vector sector.
2. method according to claim 1, is characterized in that, described ratio action time that described positive small vector sector and described negative small vector sector are set comprises:
Be arranged on when carrying out space vector pulse width modulation the ratio of the shared switch periods number of the shared switch periods number in described positive small vector sector and described negative small vector sector.
3. method according to claim 1 and 2, is characterized in that, and is described according to described action time of ratio, space vector pulse width modulation carried out in described positive small vector sector and described negative small vector sector comprise:
In a switch periods, according to described action time ratio and described switch periods, obtain the action time of each vector in described positive small vector sector; Perhaps, 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, perhaps, in described negative small vector sector, carry out space vector pulse width modulation the action time of each vector.
4. method according to claim 1 and 2, is characterized in that, and is described according to described action time of ratio, space vector pulse width modulation carried out in described positive small vector sector and described negative small vector sector comprise:
According to the synthetic virtual vector of described ratio action time;
According to described virtual vector sectorization;
Obtain the action time of except described positive small vector and described negative small vector each vector and described virtual vector according to the sector of dividing according to described virtual vector;
According to described positive small vector and described negative small vector, described virtual 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, perhaps, in described negative small vector sector, carry out space vector pulse width modulation the action time of each vector.
5. method according to claim 4, is characterized in that, 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 xThe action time that represents described virtual vector, V +Represent described positive small vector, t +The action time that represents described positive small vector, V -Represent described negative small vector, t -The action time that represents described negative small vector.
6. a modulating equipment, is characterized in that, comprising:
The polar plot acquiring unit is used for obtaining the three dimensional vector diagram corresponding with voltage in described switch periods according to the voltage of three-phase inverting circuit in a switch periods;
The first sector acquiring unit, be used for positive small vector according to described three dimensional vector diagram and obtain positive small vector sector, obtain negative small vector sector 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 is used for according to described action time of ratio, and space vector pulse width modulation is carried out in described positive small vector sector and described negative small vector sector.
7. equipment according to claim 6, is characterized in that, during ratio, described the first sector division unit specifically is used in the action time that described positive small vector sector and described negative small vector sector are set:
Be arranged on when carrying out space vector pulse width modulation the ratio of the shared switch periods number of the shared switch periods number in described positive small vector sector and described negative small vector sector.
8. according to claim 6 or 7 described equipment, is characterized in that, described modulating unit comprises:
Time acquisition unit is used in a switch periods, according to described action time ratio and described switch periods, obtains the action time of each vector in described positive small vector sector; Perhaps, obtain the action time of each vector in described negative small vector sector;
Pulse modulation unit is used for the action time according to each vector of described positive small vector sector, and perhaps, in described negative small vector sector, carry out space vector pulse width modulation the action time of each vector.
9. according to claim 6 or 7 described equipment, is characterized in that, described modulating unit comprises:
The vector synthesis unit is used for according to the synthetic virtual vector of described ratio action time;
The second sector division unit is used for according to described virtual vector sectorization;
Described time acquisition unit is used for obtaining according to the sector of dividing according to described virtual vector action time of except described positive small vector and described negative small vector each vector and described virtual vector;
Described time acquisition unit also is used 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 is used in a switch periods, and according to the action time of each vector in described positive small vector sector, perhaps, in described negative small vector sector, carry out space vector pulse width modulation the action time of each vector.
10. equipment according to claim 9, is characterized in that, 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 xThe action time that represents described virtual vector, V +Represent described positive small vector, t +The action time that represents described positive small vector, V -Represent described negative small vector, t -The action time that represents described negative small vector.
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CN107196536A (en) * 2017-05-03 2017-09-22 浙江大学 A kind of three level SVPWM methods with neutral balance and common-mode voltage rejection ability
CN108054945A (en) * 2017-12-31 2018-05-18 王大方 A kind of Virtual Space Vector Pulse Width Modulation strategy of three-level inverter
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CN108390582A (en) * 2018-03-21 2018-08-10 四川大学 A kind of single-phase three-level current transformer space vector pulse width modulation optimization method
CN108390582B (en) * 2018-03-21 2019-02-22 四川大学 A kind of single-phase three-level current transformer space vector pulse width modulation optimization method

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