CN109713928A - Four bridge legs dual output inverter SVPWM method under unbalanced load - Google Patents
Four bridge legs dual output inverter SVPWM method under unbalanced load Download PDFInfo
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Abstract
The invention discloses four bridge legs dual output inverter SVPWM methods under a kind of unbalanced load, its main feature is that: space vector modulation is used to the three-phase bridge arm of inverter, finds out the duty ratio of inversion 1 and each switch state of inversion 2 respectively.When controlling two groups of load neutral point voltages is corresponding inversion residual voltage, it can make two groups of inversion output loading voltages symmetrical under arbitrary load, and then acquire the duty ratio of N phase bridge arm according to the residual voltage of inversion 1 and inversion 2.Coordinated control is carried out to the duty ratio of inversion 1, inversion 2, N phase bridge arm in one cycle, can be realized to four bridge legs dual output inverter control.Make the corresponding residual voltage of the neutral point voltage of two groups of load factors, so that four bridge legs dual output inverter output loading voltage is two groups of symmetrical three phase sine voltages.
Description
Technical field
It is that four bridge legs dual output is inverse under a kind of unbalanced load the invention belongs to electronic power converter technical field
Become device SVPWM method.Output loading voltage is unbalanced when for solving the problems, such as the band unbalanced load of dual output inverter.
Background technique
Inverter, directly the converter of converting direct-current power into alternating-current power, can power as one kind to AC load.But
It can only be converted into direct current one group of three-phase alternating current output, need in wind generator system, electric car, rail locomotive traction etc.
It wants double cross stream field just to seem helpless, there is scholar to propose nine switch dual output inverse converter topologys thus, only need nine
A switch can be realized as two groups of three-phase alternating current electricity outputs.But it is merely able to be powered to the threephase load of two groups of balances.
With electrical horizontal continuous improvement, various power converter apparatus nonlinear-loads using more and more, it will lead to three
The imbalance of phase load.It is not necessarily balanced the load by two groups of threephase loads of dual output inverter power supply, can also be gone out simultaneously
The case where now causing balanced load to become unbalanced load due to extraneous factors such as temperature.So dual output inverter should have both
Load supplying can be balanced, the ability that can also power to unbalanced load.
Correlative study at this stage for dual output inverter with unbalanced load is relatively fewer.Existing research person proposes
The topological structure of four bridge legs dual output inverter.When the dual output inverter band unbalanced load of three bridge arms, load voltage is not right
Claim, there is zero sequence and negative sequence voltage.Negative sequence voltage can be corrected by modulating wave and eliminated by closed-loop control.But for
Residual voltage is helpless, is that three bridge arm dual output inverter itself topology institutes are unvanquishable.Therefore it can pass through increase
One phase bridge arm, this phase bridge arm are connectable to the neutral point of load, control the neutral point potential of load, so as to
The load voltage of three-phase symmetrical is exported in the case where unbalanced load.
Summary of the invention
The object of the present invention is to propose a kind of scientific and reasonable, strong applicability, four bridge legs under the unbalanced load to work well
Dual output inverter SVPWM method, it is intended to which solving existing dual output inverter cannot ask to what unbalanced load was powered
Topic.
Realize the object of the invention the technical solution adopted is that, four bridge legs dual output inverter under a kind of unbalanced load
SVPWM method, characterized in that it includes:
1) output end of the three-phase bridge arm of inverter is connected with two groups of threephase loads respectively, is referred to as inversion 1 and inverse
Become 2；Inversion 1 is made of three power switch above and intermediate three power switch, and inversion 2 is opened by following three power
It closes and intermediate three power switch composition, two groups of inversions shares intermediate three power switch；4th phase bridge arm of inverter it is defeated
Outlet is connect with the neutral point N of two groups of loads, and the 4th phase bridge arm of inverter is defined as N phase bridge arm；Respectively to two groups of inversions
Use space Vector Modulation calculates corresponding duty ratio；Control 1 load neutral point voltage of inversion is its corresponding inversion 1 zero
When sequence voltage, it can make 1 output loading voltage of inversion symmetrical under arbitrary load；It is right for its to control 2 load neutral point voltage of inversion
When 2 residual voltage of inversion answered, it can make 2 output loading voltage of inversion symmetrical under arbitrary load；And then according to inversion 1 and inversion
2 residual voltage acquires the duty ratio of inverter N phase bridge arm；
2) by the duty ratio of the duty ratio of inversion 1, inversion 2 corresponding voltage vector action time and sequence and N phase bridge arm
Duty ratio corresponding voltage vector action time and sequence synchronization coordinated control, with realize to four bridge legs dual output inverter control
System；Make the corresponding residual voltage of the neutral point voltage of two groups of loads, so that output loading voltage is two groups symmetrical three
Phase sinusoidal voltage.
Further, 1 residual voltage of inversion and 2 residual voltage of inversion are respectively as follows:
Wherein, urZ1For the residual voltage of inversion 1, urZ2For the residual voltage of inversion 2；Uo1For 1 output phase voltage amplitude of inversion
Value；Uo2For 2 output phase voltage magnitude of inversion；UdFor DC voltage；αo1=ωo1t、αo2=ωo2t；umax1For the output of inversion 1 three
The maximum value of phase voltage, umax2The maximum value of three-phase voltage is exported for inversion 2.
Further, the duty cycle functions of the inverter N phase bridge arm are as follows:
Wherein, dN1The duty ratio opened for the upper switch of the corresponding N phase bridge arm of inversion 1；dN2For the corresponding N phase bridge of inversion 2
The duty ratio that the middle switch of arm is opened.
Further, (1), according to space vector modulation algorithm, determines one on the basis of four bridge legs dual output inverter
In switch periods, duty ratio d that the upper switch of each voltage vector duty ratio of inversion 1 and the corresponding N phase bridge arm of inversion 1 is openedN1, with
And the duty ratio d that the middle switch of each voltage vector duty ratio of inversion 2 and the corresponding N phase bridge arm of inversion 2 is openedN2；(2) to inversion 1
Duty ratio, the duty ratio of inversion 2 corresponding voltage vector action time and corresponding with the inversion 1 N phase bridge arm of sequence on open
Close the duty ratio, the corresponding N phase bridge arm of inversion 2 opened duty ratio corresponding voltage vector action time for opening of middle switch and
Sequence synchronizes coordinated control, as long as the output voltage u of control N phase bridge armN1OAnd uN2OBeing averaged in a switch periods
Value is zero-sequence component urZ1And urZ2, then four bridge legs can be made double regardless of load is balance, uneven or nonlinear load
It is three phase sine symmetrical voltage that output inverter, which exports two groups of voltages,.
Four bridge legs dual output inverter SVPWM method can be realized two group three relatively under unbalanced load of the invention
The output voltage of title, no matter load is balance, uneven or nonlinear load, can make output voltage is three-phase symmetrical electricity
Pressure.Greatly improve dual output inverter application range.
Detailed description of the invention
Fig. 1 is four bridge legs dual output inverter topology schematic diagram under unbalanced load；
Fig. 2 is inversion 1,2 space vector of voltage of inversion and reference output voltage Vector modulation schematic diagram；
The Switch State Combination in Power Systems of Fig. 3 inverter and the schematic diagram that puts in order；
Fig. 4 is 1 three-phase output phase electricity of four bridge legs dual output inverter inversion under unbalanced load under modulator approach of the present invention
Pressure, 1 three-phase output current phase waveform diagram of inversion；
Fig. 5 is 2 three-phase output phase electricity of four bridge legs dual output inverter inversion under unbalanced load under modulator approach of the present invention
Pressure, 2 three-phase output current phase waveform diagram of inversion.
Specific embodiment
The invention will be described in further detail in the following with reference to the drawings and specific embodiments.
Four bridge legs dual output inverse converter SVPWM method, is balancing it under a kind of unbalanced load of the invention
It can guarantee output symmetrical voltage in the case where load, unbalanced load or nonlinear load.Four bridge legs are double under unbalanced load
The topological structure of output inverter is as shown in Figure 1, it is to increase by a phase bridge arm in the topology of three bridge arm dual output inverters, newly
Increased N phase bridge arm is connected to the neutral point N of two groups of threephase loads1And N2Place.U in Fig. 1dFor DC voltage, it is assumed that UdBy one point
It is two, midpoint O.uA1O、uB1O、uC1OIndicate 1 three-phase bridge arm of inversion to the voltage of O point；uA2O、uB2O、uC2OIndicate 2 three-phase of inversion
Voltage of the bridge arm to O point.uN1OAnd uN2OThe respectively voltage of the N phase bridge arm of inversion 1 and the N phase bridge arm of inversion 2 to O point, uA1N1、
uB1N1、uC1N1For the threephase load voltage of inversion 1；uA2N2、uB2N2、uC2N2For the threephase load voltage of inversion 2.
The output voltage equation of inversion 1 can be write out by figure are as follows:
It similarly can also obtain the output voltage equation of inversion 2:
U in formulaN1OAnd uN2OFor controlled amounts, respectively to the threephase load voltage u of inversion 1A1N1、uB1N1、uC1N1With inversion 2
Threephase load voltage uA2N2、uB2N2、uC2N2Carry out desired control.
Assuming that inversion 1 is with reference to three-phase output phase voltage
Inversion 2 exports phase voltage with reference to three-phase
U in formulao1、ωo1It is that inversion 1 exports the amplitude of phase voltage, output phase voltage angular frequency respectively；Uo2、ωo2It is respectively
Inversion 2 exports the amplitude of phase voltage, output phase voltage angular frequency angular frequency.
Inverter 1 and the output reference voltage vector of inversion 2 can calculate as follows:
Assuming that the output reference voltage vector of inversion 1 and inversion 2 is respectively positioned on the first sector, reference voltage vector synthesis is former
Reason is as shown in Figure 2.
Wherein, d11、d12、d10、d17The respectively duty ratio of the effective vector sum zero vector of inversion 1；d21、d22、d20、d27Point
Not Wei the effective vector sum zero vector of inversion 2 duty ratio.
In order to obtain three-phase symmetrical output voltage, it should to effective vector sum zero vector of inversion 1 and effective arrow of inversion 2
Amount and zero vector are effectively combined, and are made it under conditions of unbalanced load, are exported symmetrical three-phase output voltage.One
In a period, according to Fig. 3 inversion 1 and the corresponding switching sequence of inversion 2 can obtain 1 three-phase bridge arm of inversion to the voltage of O point and
Voltage of the 2 three-phase bridge arm of inversion to O point.
Bringing formula (7)-(8) into (9)-(10) can obtain:
α in formulao1=ωo1t、αo2=ωo2t。
The reference three-phase voltage that the three-phase bridge arm output voltage of inversion 1 subtracts inversion 1 obtains:
The reference three-phase voltage that the three-phase bridge arm output voltage of inversion 2 subtracts inversion 2 obtains:
It is obtained by formula (13)-(14):
urZA1=urZB1=urZC1=urZ1 (15)
urZA2=urZB2=urZC2=urZ2 (16)
Equally also u of the reference voltage vector in other 5 sectors can be calculated according to analytical procedure aboverZA1、
urZB1、urZC1And urZA2、urZB2、urZC2, and can obtain and the conclusion of (15)-(16) equally.
Formula (15)-(16) illustrate to remove in the output voltage by two groups of inverter three-phase bridge arms of space voltage vector modulation
Outside reference voltage, also contain residual voltage.Zero-sequence component urZ1And urZ2It can be respectively according to two groups of inverter reference voltage vectors
Amplitude and its place sector and angle determine.
From above analysis it is found that three-phase output phase voltage is not only fundamental positive sequence voltage, but also contain zero sequence
Component.When load is three-phase balancing load, the current potential of neutral point is equal to the residual voltage, so load voltage or three-phase
Symmetrical sine wave；When load is three-phase imbalance load, the current potential of neutral point is no longer just the residual voltage, load voltage
Become asymmetrical three-phase voltage.
Since four bridge legs dual output inverter N phase bridge arm is directly connected to the neutral point of load under unbalanced load, so
It can be to the neutral point voltage u of loadN1OAnd uN2OIt is controlled, wushu (13)-(14) are brought (1)-(2) into and obtained:
By formula (17)-(18) as long as the output voltage u of visible control N phase bridge armN1OAnd uN2OIn a switch periods
Average value is zero-sequence component urZ1And urZ2, then two groups can be made regardless of load is balance, uneven or nonlinear load
Output voltage is with reference to three-phase symmetrical sinusoidal voltage.
Assuming that the upper switch duty ratio of corresponding N phase bridge arm is d when inversion 1 acts onN1, then the middle duty ratio switched is
0.5-dN1.So output voltage u of N phase bridge armN1OAverage value as shown by the equation:
Work as uN1OEqual to urZ1When, the duty ratio that the upper switch of the corresponding N phase bridge arm of inversion 1 is opened can be acquired:
Assuming that the duty ratio of the middle switch of corresponding N phase bridge arm is d when inversion 2 acts onN2, then the duty ratio of lower switch
For 0.5-dN2.So output voltage u of N phase bridge armN2OAverage value as shown by the equation:
Work as uN2OEqual to urZ2When, the duty ratio that the middle switch of the corresponding N phase bridge arm of inversion 2 is opened can be acquired:
It is corresponding with inversion 1 to the duty ratio of inversion 1, the duty ratio of inversion 2 corresponding voltage vector action time and sequence
N phase bridge arm upper switch open duty ratio, the corresponding N phase bridge arm of inversion 2 the corresponding electricity of duty ratio opened of middle switch
Pressure vector action time and sequence synchronize coordinated control, as long as the output voltage u of control N phase bridge armN1OAnd uN2OAt one
Average value in switch periods is zero-sequence component urZ1And urZ2, then no matter loading to balance, uneven or nonlinear load, all
Enabling to four bridge legs dual output inverter to export two groups of voltages is three phase sine symmetrical voltage.
In order to illustrate the validity of modulator approach of the present invention, emulated with Matlab software.Simulation parameter is as follows: input
Voltage magnitude 200V, frequency 50Hz；1 three-phase output voltage amplitude of inversion is set as 50V, frequency 100Hz；Set inversion 2 three
Phase output phase voltage magnitude is 60V, frequency 50Hz；The threephase load resistance of inversion 1 is 16 Ω, 18 Ω, 20 Ω, and inductance is
12mH；The threephase load resistance of inversion 2 is 16 Ω, 18 Ω, 20 Ω, and inductance is 12mH.Simulation waveform is as shown in Figure 4 and Figure 5.
In Fig. 4, when 1 threephase load imbalance of inversion, it is three-phase symmetrical sine wave that inversion 1, which exports threephase load voltage,；By
Different in threephase load, it is asymmetric sine wave that threephase load, which exports electric current,.
In Fig. 5, when 2 threephase load imbalance of inversion, it is three-phase symmetrical sine wave that inversion 2, which exports threephase load voltage,；By
Different in threephase load, it is asymmetric sine wave that threephase load, which exports electric current,.
By the above simulation result it is found that under unbalanced load, modulator approach of the invention can guarantee dual output inversion
Device exports two groups of symmetrical sinusoidal voltages.
Although above in conjunction with attached drawing, invention has been described, and the invention is not limited to above-mentioned specific implementations
Mode, above-mentioned specific embodiment are schematically that and not restrictive, those skilled in the art open in of the invention
Under showing, in the case where not departing from invention objective, additionally it is possible to make other forms, all of these belong to the protection of the present invention.
Claims (4)
1. four bridge legs dual output inverter SVPWM method under a kind of unbalanced load, characterized in that it includes:
1) output end of the three-phase bridge arm of inverter is connected with two groups of threephase loads respectively, is referred to as inversion 1 and inversion 2；
Inversion 1 is made of three power switch above and intermediate three power switch, and inversion 2 be by following three power switch and
Intermediate three power switch composition, two groups of inversions share intermediate three power switch；The output end of 4th phase bridge arm of inverter
It is connect with the neutral point N of two groups of loads, the 4th phase bridge arm of inverter is defined as N phase bridge arm；Two groups of inversions are used respectively
Space vector modulation calculates corresponding duty ratio；Controlling 1 load neutral point voltage of inversion is its corresponding 1 zero sequence of inversion electricity
When pressure, it can make 1 output loading voltage of inversion symmetrical under arbitrary load；Controlling 2 load neutral point voltage of inversion is that its is corresponding
When 2 residual voltage of inversion, it can make 2 output loading voltage of inversion symmetrical under arbitrary load；And then according to inversion 1 and inversion 2
Residual voltage acquires the duty ratio of inverter N phase bridge arm；
2) duty ratio of the duty ratio of inversion 1, inversion 2 corresponding voltage vector action time and sequence are accounted for N phase bridge arm
Sky is than corresponding voltage vector action time and sequence synchronization coordinated control, to realize to four bridge legs dual output inverter control；
Make the corresponding residual voltage of the neutral point voltage of two groups of loads so that output loading voltage be two groups of symmetrical three-phases just
String voltage.
2. four bridge legs dual output inverter SVPWM method, feature under unbalanced load according to claim 1
It is that 1 residual voltage of inversion and 2 residual voltage of inversion are respectively as follows:
Wherein, urZ1For the residual voltage of inversion 1, urZ2For the residual voltage of inversion 2；Uo1For 1 output phase voltage magnitude of inversion；Uo2
For 2 output phase voltage magnitude of inversion；UdFor DC voltage；αo1=ωo1t、αo2=ωo2t；umax1Three-phase voltage is exported for inversion 1
Maximum value, umax2The maximum value of three-phase voltage is exported for inversion 2.
3. four bridge legs dual output inverter SVPWM method, feature under unbalanced load according to claim 2
It is the duty cycle functions of the inverter N phase bridge arm are as follows:
Wherein, dN1The duty ratio opened for the upper switch of the corresponding N phase bridge arm of inversion 1；dN2For the corresponding N phase bridge arm of inversion 2
The middle duty ratio opened.
4. four bridge legs dual output inverter SVPWM method, feature under unbalanced load according to claim 1
It is:
(1) it on the basis of four bridge legs dual output inverter, according to space vector modulation algorithm, determines in a switch periods,
The duty ratio d that each voltage vector duty ratio of inversion 1 and the upper switch of the corresponding N phase bridge arm of inversion 1 are openedN1And each electricity of inversion 2
The duty ratio d that the middle switch of pressure vector duty cycle and the corresponding N phase bridge arm of inversion 2 is openedN2；
(2) corresponding with inversion 1 to the duty ratio of inversion 1, the duty ratio of inversion 2 corresponding voltage vector action time and sequence
The corresponding voltage of duty ratio that the middle switch of duty ratio, the corresponding N phase bridge arm of inversion 2 that the upper switch of N phase bridge arm is opened is opened
Vector action time and sequence synchronize coordinated control, as long as the output voltage u of control N phase bridge armN1OAnd uN2OIt is opened at one
Closing the average value in the period is zero-sequence component urZ1And urZ2, then regardless of load is balance, uneven or nonlinear load, it can
Enough so that it is three phase sine symmetrical voltage that four bridge legs dual output inverter, which exports two groups of voltages,.
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