CN108429469A - The sources Z dual stage matrix converter modulator approach based on Carrier-based PWM - Google Patents
The sources Z dual stage matrix converter modulator approach based on Carrier-based PWM Download PDFInfo
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- CN108429469A CN108429469A CN201810135054.7A CN201810135054A CN108429469A CN 108429469 A CN108429469 A CN 108429469A CN 201810135054 A CN201810135054 A CN 201810135054A CN 108429469 A CN108429469 A CN 108429469A
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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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
Abstract
The present invention is a kind of sources Z dual stage matrix converter modulator approach based on Carrier-based PWM, its main feature is that, for rectification stage, by the input phase voltage division at six sectors, two amplitude maximums are selected in each sector and polarity synthesizes the DC voltage of output for positive line voltage, and calculate corresponding duty ratio；The duty ratio of effective voltage vector and Zero voltage vector is calculated according to sector where reference voltage vector using space voltage vector modulation for inverse cascade；For Z source networks, straight-through voltage vector is inserted into inverse cascade zero vector with holding water, improves voltage transfer ratio.According to entire modulated process, draw power switch pwm signal figure, calculate separately out the modulated signal of six groups of power switch of modulated signal and inverse cascade of six groups of two-way power switch of rectification stage, and compared with the same triangle carrier signal, the drive signal of the drive signal and inverse cascade power switch of rectification stage two-way power switch is obtained.It calculates simple, it is easy to accomplish.
Description
Technical field
The invention belongs to the technical fields of Communication-Communication electrical energy changer, and in particular to a kind of Z based on Carrier-based PWM
Source dual stage matrix converter modulator approach.
Background technology
For dual stage matrix converter as a kind of AC-AC 2 stage converters, it is good sinusoidal waveform not only to make input and output,
Be also equipped with energy bi-directional, can four quadrant running, not need large capacity energy-storage travelling wave tube, input power factor adjustable and can be close
The advantages that seemingly reaching 1.Although advantage is numerous, its voltage transfer ratio is low, maximum be only 0.866, and output performance easily by
The influence of abnormal input, this severely limits its applications and popularization.Z source networks are extended in dual stage matrix converter,
It is proposed the sources Z dual stage matrix converter.Only increase passive element to open not increasing power using the unique pass-through state of Z source networks
Under the premise of the quantity of pass, achieve the purpose that improve voltage transfer ratio.And due to the presence of Z source networks, largely inhibit
Influence of the abnormal input to output performance.
It is mainly at present Space Vector Modulation Strategy for the sources Z dual stage matrix converter modulator approach, including rectification stage has
The space vector modulation of space vector modulation and rectification stage without zero vector of zero vector, and proposed on the basis of space vector
Maximum boosting rectifier control and mixing minimum stress control.But when the vector modulation method of application space, need to carry out complicated triangle
Function calculates, and process is complicated, is unfavorable for programming and the realization of hardware.
Invention content
The object of the present invention is to propose a kind of scientific and reasonable, strong applicability, the sources Z based on Carrier-based PWM to work well are double
Grade Modulation Strategy of Matrix Converter, it is intended to solve the problems, such as that the existing sources Z dual stage matrix converter modulation strategy is complicated.
Realize the object of the invention the technical solution adopted is that, a kind of sources Z dual stage matrix converters modulation based on Carrier-based PWM
Method, including rectification stage, inverse cascade and Z source networks, the three-phase bridge that the rectification stage is made of six groups of two-way power switch
Rectification circuit, the three-phase inverting circuit that the inverse cascade is made of six groups of power switch, the Z source networks are identical by two
Inductance and capacitance composition lattice network, it is characterised in that：
For the rectification stage, by the input phase voltage division at six sectors, two maximums are selected in each sector
And polarity synthesizes the DC voltage of output for positive line voltage, makes to be free of no-voltage in output, calculates corresponding duty ratio；
It for inverse cascade, is inserted on the basis of space voltage vector modulation and leads directly to vector, straight-through vector is introduced as the sources Z
Inverse cascade provides unique boost function；
For Z source networks, there are two kinds of operating modes：Straight-through zero-voltage state and non-straight-through zero-voltage state, then according to
According to the modulated process of rectification stage and inverse cascade, switch modulation precedence diagram is drawn, six groups of bidirectional powers of rectification stage is calculated separately out and opens
The modulated signal of six groups of power switch of modulated signal and inverse cascade of pass, and compared with the same triangle carrier signal, obtain whole
Flow the drive signal of the drive signal and inverse cascade power switch of grade two-way power switch.
Further, the triangle carrier signal amplitude is from-U1To U1Variation, carrier cycle are identical as modulation period.
Further, the sources the Z dual stage matrix converter modulator approach based on Carrier-based PWM, which is characterized in that including with
Lower step：
1) modulated signal of six groups of two-way power switch of the rectification stage is respectively：
Work as uw>When 0,
vwp=U1；vxp=-U1；vyp=-U1
Work as uw<When 0,
vwn=U1；vxn=-U1；vyn=-U1
Wherein, w, x, y ∈ { a, b, c } vwp、vxp、vyp、vwn、vxn、vynFor the modulation of six groups of two-way power switch of rectification stage
Signal；W is maximum absolute value phase in three-phase input, and x and y are other two-phase；Work as uw>When 0, x, y two-phase lower bridge arm switching pulse
Signal is complementary, uw<When 0, bridge arm switching pulse signal is complementary in x, y two-phase；
2) modulated signal of the inverse cascade is：
Wherein, VX1And VX2For the modulated signal of inverse cascade X phases；uXThe phase voltage of X phases is exported for inverse cascade；X∈{A,B,
C}；dxAnd dyFor the duty ratio of two input line voltages of synthesis DC voltage, calculation formula is：
For the DC voltage average value of rectification stage output, calculation formula is：
Wherein, UiFor the input phase voltage magnitude,
uoffsetFor bias voltage, calculation formula is：
Wherein, umax=max (uA,uB,uC),umin=min (uA,uB,uC)；
3) modulated signal of the straight-through vector is：
Wherein, Vst1~Vst7By the modulated signal for 7 straight-through vectors being inserted into inverse cascade；
4) utilize the modulated signals of six groups of two-way power switch of rectification stage, the modulated signal of six groups of power switch of inverse cascade and
The modulated signal of straight-through vector obtains control rectification stage bidirectional power and opens respectively compared with the triangle carrier signal set
The drive signal of the drive signal and inverse cascade power switch of pass.
The present invention the sources the Z dual stage matrix converter modulator approach based on Carrier-based PWM compared with space vector modulation method,
In one modulation period, the invention avoids the calculating of complicated trigonometric function, it is easy to accomplish, and ensure that good input is defeated
Go out waveform quality, has methodological science reasonable, the advantages that strong applicability, effect is good.
Description of the drawings
Fig. 1 is the sources Z dual stage matrix converter topological structure schematic diagram；
Fig. 2 is that three-phase input voltage sector divides schematic diagram；
Fig. 3 is inverse cascade space vector of voltage schematic diagram；
Fig. 4 is rectification stage and inverse cascade power switch pwm signal schematic diagram；
Fig. 5 is straight-through zero-voltage state schematic diagram；
Fig. 6 is non-straight-through zero-voltage state schematic diagram；
Fig. 7 is that Carrier-based PWM generates rectification stage pwm signal schematic diagram；
Fig. 8 is that Carrier-based PWM generates inverse cascade pwm signal schematic diagram；
Fig. 9 is under modulator approach of the present invention, and the sources Z dual stage matrix converter rectification stage exports DC voltage, the sources Z capacitance electricity
Pressure, A phases output voltage, output three-phase current, a phases input voltage and current waveform figure.
Specific implementation mode
The present invention is described in further detail in the following with reference to the drawings and specific embodiments.
Fig. 1 is the topology diagram of the sources Z dual stage matrix converter, ua、ub、ucIndicate three-phase input phase voltage；uA、uB、uC
Indicate that three-phase exports phase voltage；
First, the duty ratio of rectification stage and each vector of inverse cascade is calculated.
For rectification stage, if three-phase input phase voltage is：
6 sectors are divided by input three-phase input voltage, as shown in Figure 2.Each sector feature having the same：Its
In the absolute value of voltage of a phase be maximum value, and in addition two-phase voltage polarity is opposite.In each sector select two maximums and
Polarity synthesizes the DC voltage of output for positive line voltage.By taking the first sector as an example, uaFor positive polarity and maximum absolute value, ub、
ucPolarity is negative, so the line voltage of output is uacAnd uab, corresponding duty ratio is dxAnd dy, to make input side power factor
It is 1, and input current waveform is sine, and it is directly proportional to voltage in phase and size should to meet every phase input current.Therefore, one
In a modulation period, the amplitude of the local mean values and corresponding input phase voltage that should meet each phase input current is directly proportional,
It can thus be concluded that：
DC voltage local mean values in one modulation periodFor：
Wherein, UiFor the input phase voltage magnitude.
According to the above analysis, power switch state in each sector and DC voltage and corresponding duty such as table can be obtained
Shown in 1.
1 rectification stage power switch state of table and DC voltage
For inverse cascade, if three-phase output phase voltage is：
Fig. 3 is inverse cascade space vector of voltage schematic diagram.Assuming that reference output voltage vector is located at the first sector, according to ginseng
The composition principle of voltage vector is examined, can be in the hope of the duty ratio of each voltage vector of inverse cascade：
d0+d7=1-d1-d2
Wherein, d1And d2It is effective vector U1And U2Duty ratio；d0And d7It is zero vector U0And U7Duty ratio；It is
Output reference voltage, and
In order to obtain the input current and output voltage of three-phase symmetrical, it should to the power switch shape of rectification stage and inverse cascade
State is effectively combined.There are two state u for rectification stage tool in each modulation periodacAnd uab, duty ratio is respectively dxAnd dy。
Therefore, the power switch state of inverse cascade should also be divided into two groups, and rectification stage and the combination of inverse cascade duty ratio are as follows：
d1(x)=d1dx；d2(x)=d2dx；d0(x)=d0dx；d7(x)=d7dx (6)
d1(y)=d1dy；d2(y)=d2dy；d0(y)=d0dy；d7(y)=d7dy (7)
Rectification stage and inverse cascade power switch pwm signal are as shown in Figure 4.
For Z source networks, there are two types of working conditions：Straight-through zero-voltage state and non-straight-through zero-voltage state.Straight-through zero electricity
When pressure condition, inverse cascade is short-circuit, and all power switch in rectification stage are turned off, and DC side and alternating current input power supplying are disconnected,
Capacitance is to induction charging, inductive energy storage, and equivalent circuit is as shown in Figure 5；When non-straight-through zero-voltage state, rectification stage and Z source networks
It powers together to inverse cascade, system is made to have higher voltage transmittability, equivalent circuit as shown in Figure 6.
Define the sensitizing factor of the sources Z dual stage matrix converterWherein dstTo lead directly to duty ratio, 0≤dst≤
0.5。
In Z source networks, inductance L1=L2With capacitance C1=C2, then then there is following relationship：
The voltage transfer ratio of the sources Z dual stage matrix converter can be reduced to：
Wherein, m is modulation factor, 0≤m≤1.
According to the above analysis as can be seen that when m and B changes within the allowable range, the voltage of the sources Z dual stage matrix converter
Transfer ratio can change to 4.33 by 0, and the transfer ratio much larger than classical matrix converter changes to 0.866 by 0.
Selection isosceles triangle wave is carrier signal, and the period is identical as modulation period, and amplitude is from-U1To U1Variation, carrier wave
PWM generates rectification stage pwm signal as shown in fig. 7, it is possible thereby to deriving that carrier signal is：
Wherein, VtIt is triangle carrier signal, U1For its amplitude.
The drive signal of rectification stage is by comparing modulating wave VcnIt is obtained with triangular carrier.According to Fig. 7, Vap=U1, institute
With the upper bridge arm power switch constant conduction of a phases；Work as VcnMore than VtWhen, the conducting of c phase lower bridge arm power switch, remaining four power
Switch OFF；Work as VcnLess than VtWhen, b phase lower bridge arm power switch is held on, remaining four power switch shutdown.
In conjunction with the duty ratio calculation formula (2) of rectification stage, can obtain rectification stage power switch modulated signal is：
vap=U1；vbp=U1；vcp=U1 (11)
van=-U1；vcn=(2dx-1)U1
Wherein, b phases lower bridge arm power switch drive signal SbnWith c phase lower bridge arm power switch drive signals ScnComplementation, because
This is according to the drive signal v of c phase lower bridge arm power switchcnIt can obtain the drive signal of b, c two-phase lower bridge arm power switch.It is logical
The modulated signal for crossing six groups of two-way power switch that summarizing can obtain rectification stage is respectively：
Work as uw>When 0,
Work as uw<When 0,
Wherein, w, x, y ∈ { a, b, c } vwp、vxp、vyp、vwn、vxn、vynFor the modulation of six groups of two-way power switch of rectification stage
Signal；W is maximum absolute value phase in three-phase input, and x and y are other two-phase；Work as uw>When 0, x, y two-phase lower bridge arm switch drive
Signal is complementary, uw<When 0, bridge arm switching drive signal is complementary in x, y two-phase.
The power switch drive signal of bridge arm is compared by two modulated signals and carrier signal in the every phase of inverse cascade
It arrives, as shown in figure 8, in figure by taking A phases as an example.In conjunction with the duty ratio calculation formula (5) of inverse cascade, can be obtained by summarizing,
The modulated signal of each phase power switch of inverse cascade is：
Wherein, VX1And VX2For the modulated signal of inverse cascade X phases；uXThe phase voltage of X phases is exported for inverse cascade；X∈{A,B,
C}；dxAnd dyFor the duty ratio of two line voltages of synthesis output DC voltage.Two modulated signal VX1、VX2It can compared with carrier wave
Obtain two groups of signal SX1, SX2, the drive signal S of bridge arm power switch in X phasesXPatrolling in formula (15) can be passed through by this two groups of signals
It collects operation to obtain, the drive signal of lower bridge arm power switch and the drive signal of upper bridge arm power switch are complementary.
The length of straight-through time influences the size of inverse cascade output voltage amplitude, and pass-through state is inserted into zero vector
Any moment all has the same effect, and is inserted into straight-through proper timing so finding, can simplify calculating, makes to be based on carrier wave
The sources the Z dual stage matrix converter modulator approach of PWM is simpler.As shown in figure 8, by input and output in the first sector for,
It is inserted into pass-through state respectively within each section of zero vector action time, the drive signal of pass-through state similar with effective vector
It is relatively obtained by two modulated signals and carrier signal.With dst2For, Vst2And Vst3It is its two modulated signals,
Modulated signal is compared with carrier signal and carries out same or operation again, it can be deduced that the Carrier-based PWM modulator approach of the pass-through state.
According to Fig. 8, and convolution (3) (5) (6) (9), the modulated signal of pass-through state can be expressed as：
Vst1=(dstdx-1)U1 (16)
Vst2=(dx-dy-dstdx)U1 (17)
Vst3=(dx-dy)U1 (18)
Vst4=(dx-dy)U1 (19)
Vst5=(dx+dstdy-dy)U1 (20)
Vst6=(2dx+2dy-dstdy-1)U1 (21)
Vst7=(2dx+2dy-1)U1 (22)
Utilize the modulated signal of six groups of two-way power switch of rectification stage, the modulated signal of six groups of power switch of inverse cascade and straight
The modulated signal of logical vector obtains control rectification stage two-way power switch respectively compared with the triangle carrier signal set
Drive signal and inverse cascade power switch drive signal.
In order to illustrate the validity of modulator approach of the present invention, emulated with Matlab softwares.Simulation parameter is as follows：Input
Voltage magnitude 200V, frequency 50Hz；Output voltage amplitude is set as 275V, frequency 100Hz；Z source network inductance L1、L2It is
1mH, capacitance C1、C2It is 220 μ F；Load resistance is 16 Ω, inductance 12mH.Simulation waveform is as shown in Figure 9.Rectification stage in figure
Output DC voltage is impulse wave, and the maximum average value within a modulation period is about 346V；Z source network capacitance voltages are steady
It is scheduled on 508V or so, DC voltage is exported far above rectification stage；A phase output voltages are impulse wave, and three-phase output voltage acts on
After resistance sense load, sinusoidal three-phase symmetrical current waveform is generated；A phase input currents be sine wave, and almost with arc in phase
Position.Simulation result illustrate the sources the Z dual stage matrix converter modulator approach the present invention is based on Carrier-based PWM can guarantee it is good input and
Output performance.
Claims (3)
1. a kind of sources Z dual stage matrix converter modulator approach based on Carrier-based PWM, including rectification stage, inverse cascade and Z source networks,
The three-phase bridge rectifier circuit that the rectification stage is made of six groups of two-way power switch, the inverse cascade are opened by six groups of power
Close the three-phase inverting circuit of composition, the lattice network that the Z source networks are made of two identical inductance and capacitance, feature
It is：
For the rectification stage, by the input phase voltage division at six sectors, two maximums and pole are selected in each sector
Property for positive line voltage synthesize the DC voltage of output, make to be free of no-voltage in output, calculate corresponding duty ratio；
It for inverse cascade, is inserted on the basis of space voltage vector modulation and leads directly to vector, straight-through vector is introduced as the inversion of the sources Z
Grade provides unique boost function；
For Z source networks, there are two kinds of operating modes：Straight-through zero-voltage state and non-straight-through zero-voltage state, then according to whole
The modulated process for flowing grade and inverse cascade, draws switch modulation precedence diagram, calculates separately out six groups of two-way power switch of rectification stage
The modulated signal of six groups of power switch of modulated signal and inverse cascade, and compared with the same triangle carrier signal, obtain rectification stage
The drive signal of the drive signal and inverse cascade power switch of two-way power switch.
2. the sources the Z dual stage matrix converter modulator approach according to claim 1 based on Carrier-based PWM, it is characterised in that：Institute
Triangle carrier signal amplitude is stated from-U1To U1Variation, carrier cycle are identical as modulation period.
3. the sources the Z dual stage matrix converter modulator approach according to claim 1 based on Carrier-based PWM, which is characterized in that packet
Include following steps：
1) modulated signal of six groups of two-way power switch of the rectification stage is respectively：
Work as uw>When 0,
vwp=U1；vxp=-U1；vyp=-U1
Work as uw<When 0,
vwn=U1；vxn=-U1；vyn=-U1
Wherein, w, x, y ∈ { a, b, c } vwp、vxp、vyp、vwn、vxn、vynFor the modulated signal of six groups of two-way power switch of rectification stage；
W is maximum absolute value phase in three-phase input, and x and y are other two-phase；Work as uw>When 0, x, y two-phase lower bridge arm switching pulse signal are mutual
It mends, uw<When 0, bridge arm switching pulse signal is complementary in x, y two-phase；
2) modulated signal of the inverse cascade is：
Wherein, VX1And VX2For the modulated signal of inverse cascade X phases；uXThe phase voltage of X phases is exported for inverse cascade；X∈{A,B,C}；dx
And dyFor the duty ratio of two input line voltages of synthesis DC voltage, calculation formula is：
For the DC voltage average value of rectification stage output, calculation formula is：
Wherein, UiFor the input phase voltage magnitude,
uoffsetFor bias voltage, calculation formula is：
Wherein, umax=max (uA,uB,uC),umin=min (uA,uB,uC)；
3) modulated signal of the straight-through vector is：
Wherein, Vst1~Vst7By the modulated signal for 7 straight-through vectors being inserted into inverse cascade；
4) modulated signals of six groups of two-way power switch of rectification stage, the modulated signal of six groups of power switch of inverse cascade and straight-through are utilized
The modulated signal of vector obtains control rectification stage two-way power switch respectively compared with the triangle carrier signal set
The drive signal of drive signal and inverse cascade power switch.
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| CN112532099A (en) * | 2020-12-20 | 2021-03-19 | 东北电力大学 | Carrier PWM modulation method of double-Trans-quasi-Z source network three-level indirect matrix converter |
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| CN109067304A (en) * | 2018-09-12 | 2018-12-21 | 北京航空航天大学 | A kind of modular high-power high-voltage motor driving method and system |
| CN109067304B (en) * | 2018-09-12 | 2020-04-17 | 北京航空航天大学 | Modular high-power high-voltage motor driving method and system |
| CN111740614A (en) * | 2020-06-24 | 2020-10-02 | 东北电力大学 | Y-source two-stage matrix converter analysis method based on state space average model |
| CN112491282A (en) * | 2020-11-06 | 2021-03-12 | 东北电力大学 | Y-source two-stage matrix converter modulation method based on carrier PWM |
| CN112491282B (en) * | 2020-11-06 | 2021-10-01 | 东北电力大学 | Y-source two-stage matrix converter modulation method based on carrier PWM |
| CN112532099A (en) * | 2020-12-20 | 2021-03-19 | 东北电力大学 | Carrier PWM modulation method of double-Trans-quasi-Z source network three-level indirect matrix converter |
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