CN107872167A - A kind of level neutral-point-clamped current transformer Virtual Space vector modulation method of voltage-type three - Google Patents
A kind of level neutral-point-clamped current transformer Virtual Space vector modulation method of voltage-type three Download PDFInfo
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- CN107872167A CN107872167A CN201711168906.4A CN201711168906A CN107872167A CN 107872167 A CN107872167 A CN 107872167A CN 201711168906 A CN201711168906 A CN 201711168906A CN 107872167 A CN107872167 A CN 107872167A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/487—Neutral point clamped inverters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
- H02M7/53875—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with analogue control of three-phase output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
- H02M7/53875—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with analogue control of three-phase output
- H02M7/53876—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with analogue control of three-phase output based on synthesising a desired voltage vector via the selection of appropriate fundamental voltage vectors, and corresponding dwelling times
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- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a kind of level neutral-point-clamped current transformer Virtual Space vector modulation method of voltage-type three, including：Form the New Virtual vector space figure of three level NPC current transformers；Determine reference voltage vector vrefWhether in the first sector of three level NPC current transformer New Virtual vector space figures；Judge reference voltage vector vrefThe triangle at place；According to reference voltage vector vrefPlace triangle calculates the action time of each virtual vector；The action time of each actual vector is calculated according to the action time of each virtual vector；The on off state output sequence according to corresponding to the action time of each actual vector calculates vector in each triangle；According to the on off state respectively switched in each phase on the level neutral-point-clamped current transformer of on off state output sequence control voltage type corresponding to vector in each triangle three, the level neutral-point-clamped current transformer Virtual Space Vector Modulation of voltage-type three is completed, the modulator approach can realize the DC capacitor voltage undulated control of complete modulation degree, total power factor.
Description
Technical field
The invention belongs to field of power electronics, is related to a kind of Virtual Space vector modulation method, and in particular to a kind of voltage
The level neutral-point-clamped current transformer Virtual Space vector modulation method of type three.
Background technology
Compared with two traditional level current transformers, three level NPC current transformers have voltage class height, transmission power big, defeated
Go out the advantages such as irregularity of wave form is small, electromagnetic interference is low, thus be widely used in power quality analysis, direct current transportation, superconduction
Numerous occasions such as energy storage, generation of electricity by new energy.However, there is DC capacitor voltage unbalance and common mode electricity in three level NPC current transformers
(electric current) problem of pressure, if not suppressing to it, gently then causes the output characteristics of three level NPC current transformers to be deteriorated, inverter side is humorous
Ripple increase, heavy then cause the system failure, initiation equipment and human safety issues.
In recent years, many scholars are enterprising in the DC capacitor voltage fluctuation of three level NPC current transformers and common-mode voltage problem
Go research, achieve some achievements in research.In terms of voltage fluctuation of capacitor, some papers use zero-sequence component injection method, will
Zero-sequence component is injected into the reference voltage of conventional modulated strategy, achieves certain effect；Some papers pass through reasonable distribution
The action time of redundant vectors, the action time for the vector for being beneficial to DC voltage balance is allowed to grow as far as possible, also in certain journey
The unbalance condition of the DC capacitor voltage of three level NPC current transformers is improved on degree.But two major class methods can not be realized above
The DC voltage balance of complete modulation degree and total power factor is controlled, and the control in high modulation, low power factor region is imitated
Fruit is poor.Accordingly, there is scholar to propose Virtual Space Vector Modulation strategy, preferably realize complete modulation degree and total power factor
DC capacitor voltage undulated control.In terms of common-mode voltage, there is scholar to be based on three-level SPWM strategy and three level SVPWM plans
Slightly propose some corresponding common-mode voltages and suppress strategy, but can not all realize the DC capacitor of complete modulation degree and total power factor
Voltage pulsation controls.
The content of the invention
A kind of the shortcomings that it is an object of the invention to overcome above-mentioned prior art, there is provided level neutral-point-clamped of voltage-type three
Current transformer Virtual Space vector modulation method, the modulator approach can realize the DC capacitor electricity of complete modulation degree, total power factor
Press undulated control.
To reach above-mentioned purpose, the level neutral-point-clamped current transformer Virtual Space Vector Modulation of voltage-type three of the present invention
Method comprises the following steps：
1) three-phase modulations ripple is obtained according to Carrier-based PWM modulator approach；
2) by three-phase modulations ripple synthesized reference voltage vector vref；
3) space vector of the level neutral-point-clamped current transformer of voltage-type three is built, obtains 27 space vectors；
4) 27 space vectors obtained according to step 3) build some virtual vectors, and three electricity are formed further according to virtual vector
The New Virtual vector space figure of flat NPC current transformers, the New Virtual vector space figure of the three level NPC current transformers is by six
Sector form, wherein, each sector by five triangle sets that virtual vector is built into；
5) two-phase rest frame, then the reference voltage vector v that step 2) is obtained are establishedrefDecompose the static seat of two-phase
Mark is fastened；
6) reference voltage vector v is determinedrefWhether fanned the first of three level NPC current transformer New Virtual vector space figures
Qu Zhong, as reference voltage vector vrefWhen not in the first sector of three level NPC current transformer New Virtual vector space figures, then
Using rotary process by reference voltage vector vrefIt is moved to the first sector of three level NPC current transformer New Virtual vector space figures
In；
7) reference voltage vector v is judgedrefThe triangle at place；
8) according to reference voltage vector vrefPlace triangle calculates the action time of each virtual vector；
9) action time of each actual vector is calculated according to the action time of each virtual vector；
10) the on off state output sequence according to corresponding to the action time of each actual vector calculates vector in each triangle；
11) the level neutral-point-clamped of on off state output sequence control voltage type three becomes according to corresponding to vector in each triangle
The on off state respectively switched in each phase on stream device, completes the level neutral-point-clamped current transformer Virtual Space Vector Modulation of voltage-type three.
Three-phase modulations ripple is in step 1)：
Wherein, M is modulation degree, and ω is fundamental wave angular frequency, and t is the time, UaFor A phase voltages, UbFor B phase voltages, UcFor C phases
Voltage；
Reference voltage vector v in step 2)refFor：
Wherein,
The space vector V of the level neutral-point-clamped current transformer of voltage-type three is in step 3)：
Wherein, UdcFor DC side total voltage, Sa、SbAnd ScRespectively the A phases of the level neutral-point-clamped current transformer of voltage-type three, B
The on off state of phase and C phases.
The first sector of three level NPC current transformer New Virtual vector space figures of structure is in step 4)：
Wherein, VZ0For virtual zero vector, VZS1And VZS2For virtual small vector, VZm1For virtual middle vector, VZl1And VZl2For void
Intend big vector.
By reference voltage vector vrefDecomposing result in two-phase rest frame is：
Wherein, q is reference voltage vector vrefWith the angle of α axles in two-phase rest frame, VαFor reference voltage vector
vrefComponent in two-phase rest frame on α axles, VβFor reference voltage vector vrefIn two-phase rest frame on β axles
Component.
Reference voltage vector vrefOn the n-th sector of three level NPC current transformer New Virtual vector space figures, wherein,
N=ceil (q/60 °) (6)
Pass through Vα、VβAnd q value judges reference voltage vector vrefThe triangle at place, basis for estimation are：
Wherein, Va、VbWith UdcFor perunit value, s1-s55 triangles are represented respectively.
According to reference voltage vector vrefThe position of place triangle calculates the action time of each virtual vector, wherein, first
The action time of each virtual vector is respectively corresponding to each triangle in sector：
The action time of each actual vector is calculated in step 9) according to the action time of each virtual vector, wherein, calculate public
Formula is：
The concrete operations of step 10) are divided into two kinds of situations, wherein, the first situation is：As reference voltage vector vrefIt is in
During the first sector, on off state output sequence is corresponding to vector in each triangle：
s1:PON-OON-OPN-OPO-OOO-POO-PNO；
s2:PON-POO-PNO-ONO-OOO-OON-OPN；
s3:ONO-PNO-PNN-PON-POO-PON-OON-OPN；
s4:PNO-PNN-PON-PPN-OPN；
s5:OPO-OPN-OON-POO-PNO-POO-PON-PPN；
As reference voltage vector vrefWhen being not at the first sector, determined according to the corresponding relation of polar plot in each triangle
On off state output sequence corresponding to vector, wherein, the vector in the first situation is replaced using following corresponding relation, wherein,
OOO：Each sector all same；
POO (in (a))-OON (2 sector)-OPO (3 sector)-NOO (4 sector)-OOP (5 sector)-ONO (6 sector)；
OON (in (a))-OPO (2 sector)-NOO (3 sector)-OOP (4 sector)-ONO (5 sector)-POO (6 sector)；
ONO (in (a))-POO (2 sector)-OON (3 sector)-OPO (4 sector)-NOO (5 sector)-OOP (6 sector)；
OPO (in (a))-NOO (2 sector)-OOP (3 sector)-ONO (4 sector)-POO (5 sector)-OON (6 sector)；
OPN (in (a))-NPO (2 sector)-NOP (3 sector)-ONP (4 sector)-PNO (5 sector)-PON (6 sector)；
PON (in (a))-OPN (2 sector)-NPO (3 sector)-NOP (4 sector)-ONP (5 sector)-PNO (6 sector)；
PNO (in (a))-PON (2 sector)-OPN (3 sector)-NPO (4 sector)-NOP (5 sector)-ONP (6 sector)；
PNN (in (a))-PPN (2 sector)-NPN (3 sector)-NPP (4 sector)-NNP (5 sector)-PNP (6 sector)；
PPN (in (a))-NPN (2 sector)-NPP (3 sector)-NNP (4 sector)-PNP (5 sector)-PNN (6 sector).
The concrete operations of step 11) are：When x phases output state is P, S is switched1xAnd switch S2xIt is open-minded, switch S3xAnd switch
S4xShut-off, when x phases output state is O, switch S2xAnd switch S3xIt is open-minded, switch S1xAnd switch S4xShut-off, x phase output states are
During N, S is switched3xAnd switch S4xIt is open-minded, switch S1xAnd switch S2xShut-off, x=a, b, c.
The invention has the advantages that：
The level neutral-point-clamped current transformer Virtual Space vector modulation method of voltage-type three of the present invention leads in operation
Cross 27 space vectors and build some virtual vectors, the new void of three level NPC current transformers is formed further according to Virtual Space vector
Intend vector space figure, then sweared according to each sector in the New Virtual vector space figure of three level NPC current transformers with reference voltage
Measure vrefPosition relationship obtain on off state output sequence, finally according to the level of on off state output sequence control voltage type three
The on off state respectively switched in each phase on neutral-point-clamped current transformer, it is simple, convenient, complete modulation degree, total power can be realized
The DC capacitor voltage undulated control of factor, and it is capable of the common-mode voltage of effective suppression system.
Brief description of the drawings
Fig. 1 is the main circuit topology figure of the level neutral-point-clamped current transformer of voltage-type three；
Fig. 2 is the voltage vector-diagram of the level neutral-point-clamped current transformer of conventional voltage type three；
Fig. 3 is the level neutral-point-clamped current transformer New Virtual vector space figure of voltage-type three；
Fig. 4 is the division figure of the first sector interior triangular in the present invention；
Fig. 5 is the level neutral-point-clamped current transformer of voltage-type three using conventional carrier modulation strategy and to during present invention switching
Simulation result figure；
Fig. 6 a are the common-mode voltage figure of SPWM strategies；
Fig. 6 b are the common-mode voltage figure of traditional VSVPWM strategies；
Fig. 6 c are the common-mode voltage figure of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings：
With reference to figure 1, Fig. 2, Fig. 3 and Fig. 4, the level neutral-point-clamped current transformer of voltage-type three includes three-phase alternating current part, three electricity
Straight flow side External connecting part, three level NPC main circuit of converter parts, voltage sensor, current sensor, AD conversion chip and
Digital processing unit, when the level neutral-point-clamped current transformer of voltage-type three is three-level inverter structure, three-phase alternating current part is negative
Carry；When the level neutral-point-clamped current transformer of voltage-type three is the devices such as three-level rectifier, static reacance generator, three-phase alternating current
Part adds three-phase AC flat wave reactor for alternating current source；When the level neutral-point-clamped current transformer of voltage-type three is three-level inverter knot
During structure, DC side External connecting part is direct voltage source；When the level neutral-point-clamped current transformer of voltage-type three is three-level rectifier knot
During structure, DC side External connecting part is load；When the level neutral-point-clamped current transformer of voltage-type three is three level static reacance generators
When, DC side is without External connecting part；In addition, the voltage of voltage sensor detection three-phase alternating current portion voltage and each electric capacity of DC side；
Current sensor detects the electric current of each phase of AC, and voltage sensor and current sensor pass through AD conversion chip and digital processing
Device connects, and digital processing unit controls the switch of each power device in three-level current transformer by drive circuit.
The level neutral-point-clamped current transformer Virtual Space vector modulation method of voltage-type three of the present invention includes following step
Suddenly：
1) three-phase modulations ripple is obtained according to Carrier-based PWM modulator approach；
2) by three-phase modulations ripple synthesized reference voltage vector vref；
3) space vector of the level neutral-point-clamped current transformer of voltage-type three is built, obtains 27 space vectors；
4) 27 space vectors obtained according to step 3) build Virtual Space vector, obtain a virtual zero vector, six
Virtual small vector, six virtual middle vectors and six virtual big vectors, then according to a virtual zero vector, six virtual small arrows
Amount, six virtual middle vectors and six virtual big vectors form the New Virtual vector space figure of three level NPC current transformers, described
The New Virtual vector space figure of three level NPC current transformers is made up of six sectors, wherein, each sector is by each virtual vector structure
Five triangle sets built into；
5) two-phase rest frame, then the reference voltage vector v that step 2) is obtained are establishedrefDecompose in the static seat of two-phase
Mark is fastened；
6) reference voltage vector v is determinedrefWhether fanned the first of three level NPC current transformer New Virtual vector space figures
Qu Zhong, as reference voltage vector vrefWhen not in the first sector of three level NPC current transformer New Virtual vector space figures, then
Using rotary process by reference voltage vector vrefIt is moved to the first sector of three level NPC current transformer New Virtual vector space figures
In；
7) reference voltage vector v is judgedrefThe triangle at place；
8) according to reference voltage vector vrefPlace triangle calculates the action time of each virtual vector；
9) action time of each actual vector is calculated according to the action time of each virtual vector；
10) output sequence of on off state is corresponded to according to vector in each triangle of the action time of each actual vector calculating；
11) according to corresponding to vector in each triangle on off state the level neutral-point-clamped of output sequence control voltage type three
On current transformer in each phase each switching tube on off state, complete the level neutral-point-clamped current transformer Virtual Space vector of voltage-type three and adjust
System.
Three-phase modulations ripple described in step 1) are：
Wherein, M is modulation degree, and ω is fundamental wave angular frequency, and t is the time, UaFor A phase voltages, UbFor B phase voltages, UcFor C phases
Voltage；
Reference voltage vector v in step 2)refFor：
Wherein,
The space vector V of the level neutral-point-clamped current transformer of voltage-type three is in step 3)：
Wherein, UdcFor DC side total voltage, Sa、SbAnd ScRespectively the level neutral-point-clamped current transformer A phases of voltage-type three, B phases
And the on off state of C phases.
The first sector of the Virtual Space vector of structure is in step 4)：
Wherein, VZ0For virtual zero vector, VZS1And VZS2For virtual small vector, VZm1For virtual middle vector, VZl1And VZl2For void
Intend big vector.
By reference voltage vector vrefDecomposing result in two-phase rest frame is：
Wherein, q is reference voltage vector vrefWith the angle of α axles in two-phase rest frame, VαFor reference voltage vector
vrefComponent in two-phase rest frame on α axles, VβFor reference voltage vector vrefIn two-phase rest frame on β axles
Component.
Reference voltage vector vrefIn the n-th sector of three level NPC current transformer New Virtual vector space figures, wherein,
N=ceil (q/60 °) (6)
Wherein, ceil () function representation rounds up, i.e. the first sector corresponds to q ∈ (0-60 °), and the second sector corresponds to q ∈
(60 ° -120 °), the 3rd sector correspond to q ∈ (120 ° -180 °), and the 4th sector corresponds to q ∈ (180 ° -240 °), and the 5th sector is corresponding
Q ∈ (240 ° -300 °), the 6th sector correspond to q ∈ (300 ° -360 °).
In addition, work as reference voltage vector vrefNot in the first sector of three level NPC current transformer New Virtual vector space figures
When middle, then change its angle with a axles, if the angle after changing is q ', q '=q- (n-1) × 60.
With reference to figure 4, step 7) passes through Vα、VβAnd q value judges reference voltage vector vrefThe triangle at place, basis for estimation
For：
Wherein, Va、VbWith UdcFor perunit value, s1-s55 triangles are represented respectively.
According to reference voltage vector v in step 8)refThe position of place triangle calculates the action time of each virtual vector,
Wherein, the action time of each virtual vector is respectively corresponding to each triangle in the first sector：
Wherein, each virtual vector action time in the first sector when reference voltage vector is located at No. 1 triangle is：
Above formula is decomposed on a axles and b axles respectively, then had：
Then have
Above formula is solved to obtain：
The action time of each actual vector is calculated in step 9) according to the action time of each virtual vector, wherein, calculate public
Formula is：
The concrete operations of step 10) are divided into two kinds of situations, wherein, the first situation is：As reference voltage vector vrefIt is in
During the first sector, the output sequence of on off state is corresponding to vector in each triangle：
s1:PON-OON-OPN-OPO-OOO-POO-PNO；
s2:PON-POO-PNO-ONO-OOO-OON-OPN；
s3:ONO-PNO-PNN-PON-POO-PON-OON-OPN；
s4:PNO-PNN-PON-PPN-OPN；
s5:OPO-OPN-OON-POO-PNO-POO-PON-PPN；
As reference voltage vector vrefWhen being not at the first sector, determined according to the corresponding relation of polar plot in each triangle
Vector corresponds to the output sequence of on off state, wherein, the vector in the first situation is replaced using following corresponding relation, wherein,
OOO：Each sector all same；
POO (in (a))-OON (2 sector)-OPO (3 sector)-NOO (4 sector)-OOP (5 sector)-ONO (6 sector)；
OON (in (a))-OPO (2 sector)-NOO (3 sector)-OOP (4 sector)-ONO (5 sector)-POO (6 sector)；
ONO (in (a))-POO (2 sector)-OON (3 sector)-OPO (4 sector)-NOO (5 sector)-OOP (6 sector)；
OPO (in (a))-NOO (2 sector)-OOP (3 sector)-ONO (4 sector)-POO (5 sector)-OON (6 sector)；
OPN (in (a))-NPO (2 sector)-NOP (3 sector)-ONP (4 sector)-PNO (5 sector)-PON (6 sector)；
PON (in (a))-OPN (2 sector)-NPO (3 sector)-NOP (4 sector)-ONP (5 sector)-PNO (6 sector)；
PNO (in (a))-PON (2 sector)-OPN (3 sector)-NPO (4 sector)-NOP (5 sector)-ONP (6 sector)；
PNN (in (a))-PPN (2 sector)-NPN (3 sector)-NPP (4 sector)-NNP (5 sector)-PNP (6 sector)；
PPN (in (a))-NPN (2 sector)-NPP (3 sector)-NNP (4 sector)-PNP (5 sector)-PNN (6 sector).
The concrete operations of step 11) are：When x phases output state is P, S is switched1xAnd switch S2xIt is open-minded, switch S3xAnd switch
S4xShut-off, when x phases output state is O, switch S2xAnd switch S3xIt is open-minded, switch S1xAnd switch S4xShut-off, x phase output states are
During N, S is switched3xAnd switch S4xIt is open-minded, switch S1xAnd switch S2xShut-off, x=a, b, c.
System shown in Figure 1 is emulated in Matlab/Simulink softwares, setting basic parameter is as shown in table 1：
Table 1
Using Matlab/Simulink softwares, according to the key parameter in table 1, obtain in Fig. 5, Fig. 6 a, Fig. 6 b and Fig. 6 c
Simulation result, wherein, Fig. 5 initial time switches to the present invention, simulation result is by upper using traditional SPWM strategies in 0.19s
It is A phases, B phase output line voltages U successively underab, three-phase output current phase Ix, DC capacitor voltage Uc1And Uc2, can by Fig. 5
Know, when switching to the present invention, the low-frequency fluctuation of DC capacitor voltage is controlled to the scope of very little near equilibrium valve.
From the Fig. 6, the common-mode voltage maximum of traditional SPWM strategies and Virtual Space Vector Modulation strategy is
133.3V(Udc/ 3), and the present invention common-mode voltage be 66.7V (Udc/ 6), common-mode voltage reduces one compared with conventional measures
Half, serve the effect of preferable suppression common mode voltage.
Claims (10)
1. a kind of level neutral-point-clamped current transformer Virtual Space vector modulation method of voltage-type three, it is characterised in that including following
Step：
1) three-phase modulations ripple is obtained according to Carrier-based PWM modulator approach；
2) by three-phase modulations ripple synthesized reference voltage vector vref；
3) space vector of the level neutral-point-clamped current transformer of voltage-type three is built, obtains 27 space vectors；
4) 27 space vectors obtained according to step 3) build some virtual vectors, and three level are formed further according to virtual vector
The New Virtual vector space figure of NPC current transformers, the New Virtual vector space figure of the three level NPC current transformers is by six fans
District's groups into, wherein, each sector by five triangle sets that virtual vector is built into；
5) two-phase rest frame, then the reference voltage vector v that step 2) is obtained are establishedrefDecompose two-phase rest frame
On；
6) reference voltage vector v is determinedrefWhether in the first sector of three level NPC current transformer New Virtual vector space figures,
As reference voltage vector vrefWhen not in the first sector of three level NPC current transformer New Virtual vector space figures, then using rotation
Robin is by reference voltage vector vrefIt is moved in the first sector of three level NPC current transformer New Virtual vector space figures；
7) reference voltage vector v is judgedrefThe triangle at place；
8) according to reference voltage vector vrefPlace triangle calculates the action time of each virtual vector；
9) action time of each actual vector is calculated according to the action time of each virtual vector；
10) the on off state output sequence according to corresponding to the action time of each actual vector calculates vector in each triangle；
11) the level neutral-point-clamped current transformer of on off state output sequence control voltage type three according to corresponding to vector in each triangle
The on off state respectively switched in upper each phase, completes the level neutral-point-clamped current transformer Virtual Space Vector Modulation of voltage-type three.
2. the level neutral-point-clamped current transformer Virtual Space vector modulation method of voltage-type three according to claim 1, it is special
Sign is that three-phase modulations ripple is in step 1)：
<mrow>
<mfenced open = "{" close = "">
<mtable>
<mtr>
<mtd>
<mrow>
<msub>
<mi>U</mi>
<mi>a</mi>
</msub>
<mo>=</mo>
<mi>M</mi>
<mi> </mi>
<mi>s</mi>
<mi>i</mi>
<mi>n</mi>
<mrow>
<mo>(</mo>
<mi>&omega;</mi>
<mi>t</mi>
<mo>)</mo>
</mrow>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<msub>
<mi>U</mi>
<mi>b</mi>
</msub>
<mo>=</mo>
<mi>M</mi>
<mi> </mi>
<mi>s</mi>
<mi>i</mi>
<mi>n</mi>
<mrow>
<mo>(</mo>
<mi>&omega;</mi>
<mi>t</mi>
<mo>-</mo>
<mn>2</mn>
<mi>&pi;</mi>
<mo>/</mo>
<mn>3</mn>
<mo>)</mo>
</mrow>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<msub>
<mi>U</mi>
<mi>c</mi>
</msub>
<mo>=</mo>
<mi>M</mi>
<mi> </mi>
<mi>s</mi>
<mi>i</mi>
<mi>n</mi>
<mrow>
<mo>(</mo>
<mi>&omega;</mi>
<mi>t</mi>
<mo>+</mo>
<mn>2</mn>
<mi>&pi;</mi>
<mo>/</mo>
<mn>3</mn>
<mo>)</mo>
</mrow>
</mrow>
</mtd>
</mtr>
</mtable>
</mfenced>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>1</mn>
<mo>)</mo>
</mrow>
</mrow>
Wherein, M is modulation degree, and ω is fundamental wave angular frequency, and t is the time, UaFor A phase voltages, UbFor B phase voltages, UcFor C phase voltages；
Reference voltage vector v in step 2)refFor：
<mrow>
<msub>
<mi>v</mi>
<mrow>
<mi>r</mi>
<mi>e</mi>
<mi>f</mi>
</mrow>
</msub>
<mo>=</mo>
<mfrac>
<mn>2</mn>
<mn>3</mn>
</mfrac>
<mrow>
<mo>(</mo>
<msub>
<mi>U</mi>
<mi>a</mi>
</msub>
<mo>+</mo>
<msub>
<mi>&alpha;U</mi>
<mi>b</mi>
</msub>
<mo>+</mo>
<msup>
<mi>&alpha;</mi>
<mn>2</mn>
</msup>
<msub>
<mi>U</mi>
<mi>c</mi>
</msub>
<mo>)</mo>
</mrow>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>2</mn>
<mo>)</mo>
</mrow>
</mrow>
Wherein,
The space vector V of the level neutral-point-clamped current transformer of voltage-type three is in step 3)：
<mrow>
<mi>V</mi>
<mo>=</mo>
<mfrac>
<msub>
<mi>U</mi>
<mrow>
<mi>d</mi>
<mi>c</mi>
</mrow>
</msub>
<mn>3</mn>
</mfrac>
<mrow>
<mo>(</mo>
<msub>
<mi>S</mi>
<mi>a</mi>
</msub>
<mo>+</mo>
<msub>
<mi>&alpha;S</mi>
<mi>b</mi>
</msub>
<mo>+</mo>
<msup>
<mi>&alpha;</mi>
<mn>2</mn>
</msup>
<msub>
<mi>S</mi>
<mi>c</mi>
</msub>
<mo>)</mo>
</mrow>
<mo>,</mo>
<mrow>
<mo>(</mo>
<mi>&alpha;</mi>
<mo>=</mo>
<msup>
<mi>e</mi>
<mrow>
<mi>j</mi>
<mfrac>
<mn>2</mn>
<mn>3</mn>
</mfrac>
<mi>&pi;</mi>
</mrow>
</msup>
<mo>)</mo>
</mrow>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>3</mn>
<mo>)</mo>
</mrow>
</mrow>
Wherein, UdcFor DC side total voltage, Sa、SbAnd ScRespectively the A phases of the level neutral-point-clamped current transformer of voltage-type three, B phases and
The on off state of C phases.
3. the level neutral-point-clamped current transformer Virtual Space vector modulation method of voltage-type three according to claim 1, it is special
Sign is that the first sector of three level NPC current transformer New Virtual vector space figures of structure is in step 4)：
<mrow>
<mfenced open = "{" close = "">
<mtable>
<mtr>
<mtd>
<mrow>
<msub>
<mi>V</mi>
<mrow>
<mi>Z</mi>
<mn>0</mn>
</mrow>
</msub>
<mo>=</mo>
<msub>
<mi>V</mi>
<mrow>
<mi>O</mi>
<mi>O</mi>
<mi>O</mi>
</mrow>
</msub>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<msub>
<mi>V</mi>
<mrow>
<mi>Z</mi>
<mi>S</mi>
<mn>1</mn>
</mrow>
</msub>
<mo>=</mo>
<mfrac>
<mn>1</mn>
<mn>3</mn>
</mfrac>
<msub>
<mi>V</mi>
<mrow>
<mi>O</mi>
<mi>O</mi>
<mi>N</mi>
</mrow>
</msub>
<mo>+</mo>
<mfrac>
<mn>1</mn>
<mn>3</mn>
</mfrac>
<msub>
<mi>V</mi>
<mrow>
<mi>P</mi>
<mi>O</mi>
<mi>O</mi>
</mrow>
</msub>
<mo>+</mo>
<mfrac>
<mn>1</mn>
<mn>3</mn>
</mfrac>
<msub>
<mi>V</mi>
<mrow>
<mi>O</mi>
<mi>N</mi>
<mi>O</mi>
</mrow>
</msub>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<msub>
<mi>V</mi>
<mrow>
<mi>Z</mi>
<mi>S</mi>
<mn>2</mn>
</mrow>
</msub>
<mo>=</mo>
<mfrac>
<mn>1</mn>
<mn>3</mn>
</mfrac>
<msub>
<mi>V</mi>
<mrow>
<mi>O</mi>
<mi>O</mi>
<mi>N</mi>
</mrow>
</msub>
<mo>+</mo>
<mfrac>
<mn>1</mn>
<mn>3</mn>
</mfrac>
<msub>
<mi>V</mi>
<mrow>
<mi>P</mi>
<mi>O</mi>
<mi>O</mi>
</mrow>
</msub>
<mo>+</mo>
<mfrac>
<mn>1</mn>
<mn>3</mn>
</mfrac>
<msub>
<mi>V</mi>
<mrow>
<mi>O</mi>
<mi>P</mi>
<mi>O</mi>
</mrow>
</msub>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<msub>
<mi>V</mi>
<mrow>
<mi>Z</mi>
<mi>m</mi>
<mn>1</mn>
</mrow>
</msub>
<mo>=</mo>
<mfrac>
<mn>1</mn>
<mn>3</mn>
</mfrac>
<msub>
<mi>V</mi>
<mrow>
<mi>O</mi>
<mi>P</mi>
<mi>N</mi>
</mrow>
</msub>
<mo>+</mo>
<mfrac>
<mn>1</mn>
<mn>3</mn>
</mfrac>
<msub>
<mi>V</mi>
<mrow>
<mi>P</mi>
<mi>O</mi>
<mi>N</mi>
</mrow>
</msub>
<mo>+</mo>
<mfrac>
<mn>1</mn>
<mn>3</mn>
</mfrac>
<msub>
<mi>V</mi>
<mrow>
<mi>P</mi>
<mi>N</mi>
<mi>O</mi>
</mrow>
</msub>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<msub>
<mi>V</mi>
<mrow>
<mi>Z</mi>
<mi>l</mi>
<mn>1</mn>
</mrow>
</msub>
<mo>=</mo>
<msub>
<mi>V</mi>
<mrow>
<mi>P</mi>
<mi>N</mi>
<mi>N</mi>
</mrow>
</msub>
<mo>,</mo>
<msub>
<mi>V</mi>
<mrow>
<mi>Z</mi>
<mi>l</mi>
<mn>2</mn>
</mrow>
</msub>
<mo>=</mo>
<msub>
<mi>V</mi>
<mrow>
<mi>P</mi>
<mi>P</mi>
<mi>N</mi>
</mrow>
</msub>
</mrow>
</mtd>
</mtr>
</mtable>
</mfenced>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>4</mn>
<mo>)</mo>
</mrow>
</mrow>
Wherein, VZ0For virtual zero vector, VZS1And VZS2For virtual small vector, VZm1For virtual middle vector, VZl1And VZl2To be virtual big
Vector.
4. the level neutral-point-clamped current transformer Virtual Space vector modulation method of voltage-type three according to claim 1, it is special
Sign is, by reference voltage vector vrefDecomposing result in two-phase rest frame is：
<mrow>
<mfenced open = "{" close = "">
<mtable>
<mtr>
<mtd>
<mrow>
<msub>
<mi>V</mi>
<mi>&alpha;</mi>
</msub>
<mo>=</mo>
<mo>|</mo>
<msub>
<mi>v</mi>
<mrow>
<mi>r</mi>
<mi>e</mi>
<mi>f</mi>
</mrow>
</msub>
<mo>|</mo>
<mi>cos</mi>
<mi> </mi>
<mi>q</mi>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<msub>
<mi>V</mi>
<mi>&beta;</mi>
</msub>
<mo>=</mo>
<mo>|</mo>
<msub>
<mi>v</mi>
<mrow>
<mi>r</mi>
<mi>e</mi>
<mi>f</mi>
</mrow>
</msub>
<mo>|</mo>
<mi>sin</mi>
<mi> </mi>
<mi>q</mi>
</mrow>
</mtd>
</mtr>
</mtable>
</mfenced>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>5</mn>
<mo>)</mo>
</mrow>
</mrow>
Wherein, q is reference voltage vector vrefWith the angle of α axles in two-phase rest frame, VαFor reference voltage vector vrefTwo
Component in phase rest frame on α axles, VβFor reference voltage vector vrefComponent in two-phase rest frame on β axles.
5. the level neutral-point-clamped current transformer Virtual Space vector modulation method of voltage-type three according to claim 1, it is special
Sign is, reference voltage vector vrefOn the n-th sector of three level NPC current transformer New Virtual vector space figures, wherein,
N=ceil (q/60 °) (6)
6. the level neutral-point-clamped current transformer Virtual Space vector modulation method of voltage-type three according to claim 1, it is special
Sign is, passes through Vα、VβAnd q value judges reference voltage vector vrefThe triangle at place, basis for estimation are：
Wherein, Va、VbWith UdcFor perunit value, s1-s55 triangles are represented respectively.
7. the level neutral-point-clamped current transformer Virtual Space vector modulation method of voltage-type three according to claim 1, it is special
Sign is, according to reference voltage vector vrefThe position of place triangle calculates the action time of each virtual vector, wherein, first
The action time of each virtual vector is respectively corresponding to each triangle in sector：
<mrow>
<mi>k</mi>
<mo>=</mo>
<mfrac>
<mrow>
<msqrt>
<mn>3</mn>
</msqrt>
<mo>|</mo>
<msub>
<mi>V</mi>
<mrow>
<mi>r</mi>
<mi>e</mi>
<mi>f</mi>
</mrow>
</msub>
<mo>|</mo>
</mrow>
<msub>
<mi>U</mi>
<mrow>
<mi>d</mi>
<mi>c</mi>
</mrow>
</msub>
</mfrac>
</mrow>
8. the level neutral-point-clamped current transformer Virtual Space vector modulation method of voltage-type three according to claim 7, it is special
Sign is, calculates the action time of each actual vector in step 9) according to the action time of each virtual vector, wherein, calculation formula
For：
<mrow>
<mfenced open = "{" close = "">
<mtable>
<mtr>
<mtd>
<mrow>
<msub>
<mi>T</mi>
<mrow>
<mi>O</mi>
<mi>O</mi>
<mi>O</mi>
</mrow>
</msub>
<mo>=</mo>
<msub>
<mi>T</mi>
<mrow>
<mi>Z</mi>
<mn>0</mn>
</mrow>
</msub>
<mo>;</mo>
<msub>
<mi>T</mi>
<mrow>
<mi>O</mi>
<mi>O</mi>
<mi>N</mi>
</mrow>
</msub>
<mo>,</mo>
<msub>
<mi>T</mi>
<mrow>
<mi>P</mi>
<mi>O</mi>
<mi>O</mi>
</mrow>
</msub>
<mo>=</mo>
<mfrac>
<mn>1</mn>
<mn>3</mn>
</mfrac>
<msub>
<mi>T</mi>
<mrow>
<mi>Z</mi>
<mi>S</mi>
<mn>1</mn>
</mrow>
</msub>
<mo>+</mo>
<mfrac>
<mn>1</mn>
<mn>3</mn>
</mfrac>
<msub>
<mi>T</mi>
<mrow>
<mi>Z</mi>
<mi>S</mi>
<mn>2</mn>
</mrow>
</msub>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<msub>
<mi>T</mi>
<mrow>
<mi>O</mi>
<mi>N</mi>
<mi>O</mi>
</mrow>
</msub>
<mo>=</mo>
<mfrac>
<mn>1</mn>
<mn>3</mn>
</mfrac>
<msub>
<mi>T</mi>
<mrow>
<mi>Z</mi>
<mi>S</mi>
<mn>1</mn>
</mrow>
</msub>
<mo>,</mo>
<msub>
<mi>T</mi>
<mrow>
<mi>O</mi>
<mi>P</mi>
<mi>O</mi>
</mrow>
</msub>
<mo>=</mo>
<mfrac>
<mn>1</mn>
<mn>3</mn>
</mfrac>
<msub>
<mi>T</mi>
<mrow>
<mi>Z</mi>
<mi>S</mi>
<mn>2</mn>
</mrow>
</msub>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<msub>
<mi>T</mi>
<mrow>
<mi>O</mi>
<mi>P</mi>
<mi>N</mi>
</mrow>
</msub>
<mo>,</mo>
<msub>
<mi>T</mi>
<mrow>
<mi>P</mi>
<mi>O</mi>
<mi>N</mi>
</mrow>
</msub>
<mo>,</mo>
<msub>
<mi>T</mi>
<mrow>
<mi>P</mi>
<mi>N</mi>
<mi>O</mi>
</mrow>
</msub>
<mo>=</mo>
<mfrac>
<mn>1</mn>
<mn>3</mn>
</mfrac>
<msub>
<mi>T</mi>
<mrow>
<mi>Z</mi>
<mi>m</mi>
<mn>1</mn>
</mrow>
</msub>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<msub>
<mi>T</mi>
<mrow>
<mi>P</mi>
<mi>N</mi>
<mi>N</mi>
</mrow>
</msub>
<mo>=</mo>
<msub>
<mi>T</mi>
<mrow>
<mi>Z</mi>
<mi>l</mi>
<mn>1</mn>
</mrow>
</msub>
<mo>,</mo>
<msub>
<mi>T</mi>
<mrow>
<mi>P</mi>
<mi>P</mi>
<mi>N</mi>
</mrow>
</msub>
<mo>=</mo>
<msub>
<mi>T</mi>
<mrow>
<mi>Z</mi>
<mi>l</mi>
<mn>2</mn>
</mrow>
</msub>
</mrow>
</mtd>
</mtr>
</mtable>
</mfenced>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>9</mn>
<mo>)</mo>
</mrow>
</mrow>
9. the level neutral-point-clamped current transformer Virtual Space vector modulation method of voltage-type three according to claim 1, it is special
Sign is that the concrete operations of step 10) are divided into two kinds of situations, wherein, the first situation is：As reference voltage vector vrefIt is in
During the first sector, on off state output sequence is corresponding to vector in each triangle：
s1:PON-OON-OPN-OPO-OOO-POO-PNO；
s2:PON-POO-PNO-ONO-OOO-OON-OPN；
s3:ONO-PNO-PNN-PON-POO-PON-OON-OPN；
s4:PNO-PNN-PON-PPN-OPN；
s5:OPO-OPN-OON-POO-PNO-POO-PON-PPN；
As reference voltage vector vrefWhen being not at the first sector, vector in each triangle is determined according to the corresponding relation of polar plot
Corresponding on off state output sequence, wherein, the vector in the first situation is replaced using following corresponding relation, wherein,
OOO：Each sector all same；
POO (in (a))-OON (2 sector)-OPO (3 sector)-NOO (4 sector)-OOP (5 sector)-ONO (6 sector)；
OON (in (a))-OPO (2 sector)-NOO (3 sector)-OOP (4 sector)-ONO (5 sector)-POO (6 sector)；
ONO (in (a))-POO (2 sector)-OON (3 sector)-OPO (4 sector)-NOO (5 sector)-OOP (6 sector)；
OPO (in (a))-NOO (2 sector)-OOP (3 sector)-ONO (4 sector)-POO (5 sector)-OON (6 sector)；
OPN (in (a))-NPO (2 sector)-NOP (3 sector)-ONP (4 sector)-PNO (5 sector)-PON (6 sector)；
PON (in (a))-OPN (2 sector)-NPO (3 sector)-NOP (4 sector)-ONP (5 sector)-PNO (6 sector)；
PNO (in (a))-PON (2 sector)-OPN (3 sector)-NPO (4 sector)-NOP (5 sector)-ONP (6 sector)；
PNN (in (a))-PPN (2 sector)-NPN (3 sector)-NPP (4 sector)-NNP (5 sector)-PNP (6 sector)；
PPN (in (a))-NPN (2 sector)-NPP (3 sector)-NNP (4 sector)-PNP (5 sector)-PNN (6 sector).
10. the level neutral-point-clamped current transformer Virtual Space vector modulation method of voltage-type three according to claim 1, it is special
Sign is that the concrete operations of step 11) are：When x phases output state is P, S is switched1xAnd switch S2xIt is open-minded, switch S3xAnd switch
S4xShut-off, when x phases output state is O, switch S2xAnd switch S3xIt is open-minded, switch S1xAnd switch S4xShut-off, x phase output states are
During N, S is switched3xAnd switch S4xIt is open-minded, switch S1xAnd switch S2xShut-off, x=a, b, c.
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| CN108696166A (en) * | 2018-06-20 | 2018-10-23 | 合肥工业大学 | A kind of Virtual Space Vector Pulse Width Modulation method of three-level current transformer |
| EP3926811A4 (en) * | 2019-02-14 | 2022-02-23 | Mitsubishi Electric Corporation | Power conversion device |
| US11848600B2 (en) | 2019-02-14 | 2023-12-19 | Mitsubishi Electric Corporation | Power conversion device with control circuit to adjust a common mode voltage of combined output voltages |
| CN110112945A (en) * | 2019-04-28 | 2019-08-09 | 华中科技大学 | The method and system that the control of three-level inverter mid-point voltage and common-mode voltage inhibit |
| CN111181429A (en) * | 2020-01-09 | 2020-05-19 | 东北农业大学 | Three-partition-based three-level inverter neutral-point voltage balancing method and system |
| CN111181429B (en) * | 2020-01-09 | 2023-06-13 | 东北农业大学 | Balancing method and system for neutral point voltage of three-level inverter based on three partitions |
| CN111293915A (en) * | 2020-02-29 | 2020-06-16 | 天津工业大学 | Improved virtual vector modulation method for NPC inverter under neutral point potential imbalance |
| CN111293915B (en) * | 2020-02-29 | 2023-03-31 | 天津工业大学 | Improved virtual vector modulation method for NPC inverter under neutral point potential imbalance |
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