CN109347347A - The universal 3D-SVPWM control method of three-phase four-wire three-level inverter and control system under unbalanced load - Google Patents
The universal 3D-SVPWM control method of three-phase four-wire three-level inverter and control system under unbalanced load Download PDFInfo
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- CN109347347A CN109347347A CN201811185994.3A CN201811185994A CN109347347A CN 109347347 A CN109347347 A CN 109347347A CN 201811185994 A CN201811185994 A CN 201811185994A CN 109347347 A CN109347347 A CN 109347347A
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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
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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
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Abstract
The invention discloses a kind of universal 3D-SVPWM control method of three-phase four-wire three-level inverter under unbalanced load and control system, method is to obtain three-phase output voltage combinations of states according to the switch state of each bridge arm of three-level inverter；The amplitude transformations such as utilize three-phase output voltage being converted into α β ο coordinate system；It defines and corresponds to zero axle vector at new coordinate origin and the origin；By the three-dimensional subspace projection after coordinate translation to alpha-beta plane, Vector modulation is carried out in conjunction with zero axle vector；Vector expression is decomposed, the zero-sequence component generated by the action time compensation being adjusted to zero axle vector by asymmetric load keeps the balance of voltage output.The present invention additionally divides inside and outside subspace without the concern for redundancy small vector during space divides again, simplifies the algorithm of spatial sector division；Projection of three n-dimensional subspace ns in alpha-beta plane simultaneously is combined with zero axle vector, to avoid complicated vector selection and can calculate, have good versatility.
Description
Technical field
The present invention relates to the control technologies of Technics of Power Electronic Conversion device field, more particularly to three-phase four under unbalanced load
The universal 3D-SVPWM control method of line three-level inverter and control system.
Background technique
With the development of power electronics technology, two-level inverter is in small-power active power filtering and motor speed regulation system
It with quite mature, but is limited by power electronic devices stress levels, working frequency, in high-power industrial circle
Middle two-level inverter can not adapt to actual demand, come into being by the multi-electrical level inverter of representative of three-level inverter.
Compared with two level, three-level inverter is low with output waveform aberration rate, device voltage stress is small and system electromagnetic interference
Low advantage is therefore widely used in the fields such as power grid active power filtering, motor variable-frequency speed-regulating and power system reactive power compensation.
Three-phase four-wire system inverter has zero sequence access, can meet the applications such as unbalanced load or nonlinear load,
One of research focus as three-level inverter.Common three-phase four-wire system inverter includes the three-phase with isolating transformer
Four-wire system inverter, split capacitor formula three-phase four-wire system inverter and three-phase four-leg inverter etc., these inverters are substantially former
Reason is all to improve the ability of system processing unbalanced load by controlling power supply mid-point voltage.Traditional three electricity of three-phase three-wire system
Flat inverter generally uses dSPACE of SVPWM (SVPWM), and reference voltage vector is projected to alpha-beta coordinate system and is carried out
Modulation strategy analysis, and due to the presence of middle line in three-phase four-wire three-level inverter, zero vector cannot be simply used as
It crosses vector to be ignored, when analysis needs to consider three components of α, β and ο axis, realizes the control of zero-sequence component.Furthermore four bridge legs three
Electrical level inverter carries out vector controlled frequently as entirety in existing SVPWM control method, and algorithm complexity improves, with point
The four-wire system inverters such as condenser type control method is split there are very big difference, and existing control method can not be general, and increase is researched and analysed
Repeatability.
Summary of the invention
Goal of the invention: to solve the deficiencies in the prior art, it is inverse to provide three level of three-phase four-wire system under a kind of unbalanced load
Become the universal 3D-SVPWM control method of device.
Technical solution: for achieving the above object, the invention adopts the following technical scheme:
The universal 3D-SVPWM control method of three-phase four-wire three-level inverter under unbalanced load, including following step
It is rapid:
(1) 27 kinds of three-phase output voltage combinations of states are obtained according to the switch state of each bridge arm of three-level inverter；
(2) it the amplitude transformations such as utilizes three-phase output voltage being converted into α β ο coordinate system, obtains corresponding base vector；
(3) using the pairs of small vector in α β o three-dimensional system of coordinate as translation vector, new coordinate origin and the origin are defined
Locate corresponding zero axle vector；
(4) by 6 three-dimensional subspace projections after coordinate translation to alpha-beta plane, reference voltage sector is determined, zygote is empty
Between projection with zero axle vector, using two level space SVPWM methods determine vector sequence of operation carry out target vector synthesis,
Obtain vector calculating formula；
(5) vector expression is decomposed, the action time of zero axle vector is calculated, by the action time for adjusting the pairs of zero axle vector
The zero-sequence component generated by asymmetric load is compensated, the balance of voltage output is kept.
Further, coordinate translation is carried out by translation vector of 6 pairs of small vectors in base vector in step (3), and will be small
The terminal of vector is defined as new coordinate origin, totally 6 new coordinate origins；Then three-dimensional space locating for space vector is drawn
It is divided into 6 three n-dimensional subspace ns, is converted to two level three-dimensional space under new coordinate origin, the zero axle arrow in each two level space
Amount is projection components of the pairs of translation vector in zero axle, contrary, differ in size.
Further, the zero axle arrow in step (4) according to subspace at the projection and new coordinate origin in alpha-beta plane
Amount, the vector sequence of operation of each sector is determined using two level space SVPWM methods, lists vector calculating formula are as follows:
Wherein, U01、U02Positive and negative zero axle vector under respectively new coordinate system, UrefTarget vector is synthesized for three-phase voltage,
t1、t2、t01And t02For the action time of zero axle vector, TsFor switch periods.
Further, the vector calculating formula synthesized in step (4) is divided on three directions of α β ο coordinate system in step (5)
Solution, and zero axle breakdown is listed according to the zero axle vector at new coordinate origin, arrange to obtain t1、t2Expression formula and two level SVPWMs
It is similar, but contrary, a pair of of zero axle vector U for differing in size in three n-dimensional subspace ns01、U02Action time t01、t02No longer
Deng the action time by adjusting zero axle vector compensates zero-sequence component when achieving the purpose that unbalanced load.
Wherein, the three-phase four-wire three-level inverter which is applicable in includes: three electricity of NPC type three-phase four-wire system
Flat inverter, four bridge of NPC type three-phase four-bridge arm tri-level inverter, T-type three-phase four-wire three-level inverter and T-type three-phase
Arm three-level inverter.
A kind of control system that above-mentioned control method is applicable, including three-phase bridge arm 3D-SVPWM control module and four bridge legs
Individual control module, the three-phase bridge arm 3D-SVPWM control module prime modulation three-phase voltage and zero axle voltage obtain three-phase
Four-wire system three-level inverter target vector under unbalanced load inputs 3D-SVPWM control and carries out mesh in each component of α β ο axis
The synthesis of vector is marked, the PWM modulation wave of three-phase bridge arm is exported；Four bridge legs individual control module samples zero-axis current, through voltage
Current double-ring modulation output four bridge legs PWM modulation wave；The system is suitable for NPC type three-phase four-bridge arm tri-level inverter and T
Type three-phase four-bridge arm tri-level inverter.
The utility model has the advantages that control method of the present invention is based on α β ο coordinate system, using the pairs of small vector in base vector as translation vector
Amount is defined new coordinate origin and corresponding zero axle vector, is synthesized using the Vector modulation principle of two level SVPWM control methods
Target vector calculates separately the action time of zero axle vector, adjusts the action time compensation of the pairs of zero vector because asymmetry is negative
The zero-sequence component generated is carried, to keep the balance of voltage output.Compared with prior art, this kind of new universal 3D-SVPWM
Control method is by the unified conversion of all base vectors to two level space synthesized reference vectors under new coordinate origin, to former three level
The zero vector and redundancy small vector of output carry out unified discussion, do not need additionally to divide inside and outside subspace, simplify three-dimensional space
Between the algorithm that divides；Simultaneously at 6 sub-spaces and new coordinate origin zero axle vector definition so that the vector in each subspace
Effect has similitude with two level space SVPWM methods, to avoid complicated vector selection and can calculate.And it realizes
First three bridge arm is independently controlled with four bridge legs, first three bridge arm is modulated using 3D-SVPWM, to the load zero sequence of four bridge legs
Electric current carries out independent tracking, and the control research solved for a certain topological structure is very difficult to apply in other topological structures
Problem reduces the repeatability researched and analysed.
Detailed description of the invention
Fig. 1 is four kinds of applicable three-phase four-wire three-level inverter topology diagrams of the method for the present invention, and (a) is NPC type
Three-phase four-wire system topology is (b) NPC type three-phase four-arm topology, is (c) T-type three-phase four-wire system topology, (d) is T-type three-phase four
Bridge arm topological；
Fig. 2 is the three-phase bridge arm control block diagram for realizing the proposed 3D-SVPWM control method of the present invention；
Fig. 3 is four bridge legs independent control block diagram；
Fig. 4 is the method for the present invention flow chart；
(a) is vector distribution map of the space vector in three-dimensional space of three-level inverter in Fig. 5, (b) is space vector
In the projection of alpha-beta plane；
Fig. 6 is seven segmentation pulse sequence diagram of the first sector first community domain；
Fig. 7 is the lower voltage and current waveform that balances the load；
Fig. 8 is single-phase unbalanced load stable state output waveform figure.
Specific embodiment
Specific embodiments of the present invention are further explained with reference to the accompanying drawing, but the following contents is not used in limit
Determine protection scope of the present invention.
As shown in Figure 1, four kinds of three-phase four-wire three-level inverter topology diagrams that the present invention is applicable in include: (a)
Diode clamp (NPC) type three-phase four-wire three-level inverter, (b) NPC type three-phase four-bridge arm tri-level inverter, (c) T-type
Three-phase four-wire three-level inverter and (d) T-type three-phase four-bridge arm tri-level inverter topology, wherein (a) (c) is based on NPC
The three-phase output loading midpoint of its star-like connection is connected by type three-level inverter, (a) with the midpoint of split capacitor, uneven for band
The zero-sequence component that weighing apparatus load or nonlinear load generate provides access, (c) is added on the basis of (a) by two switching device strings
Join the four bridge legs of composition；(b) (d) is based on T-type three-level inverter, which uses two back-to-back switching device Q3、Q2
Split capacitor midpoint and voltage output point are connected, the two-way flow of electric current when realizing no-voltage output, (b) by its star-like connection
Three-phase output loading midpoint is connected with the midpoint of split capacitor, and four bridge legs (d) are added on the basis of (b).
3D-SVPWM control method proposed by the invention can be directly used for three-phase four-wire system shown in (a) (c) as shown in figure 1
Three-level inverter, (a) and (c) directlys adopt control block diagram as shown in Figure 2 in Fig. 1, to three-phase output voltage Ua、Ub、Uc
And zero axle voltage modulated, wherein zero axle voltage modulated includes capacitance voltage Uc1、Uc2Grading ring and residual voltage (Ua+Ub+Uc)/
The output quantity of two loops is superimposed the modulated signal as zero axle loop, obtains target vector at each point of ο axis of α β by 3 control rings
Amount input 3D-SVPWM control carries out the synthesis of target vector, finally obtains the PWM modulation wave of three-phase bridge arm.And to such as Fig. 1
In (b) (d) need when being controlled the dual-loop controller in conjunction with Fig. 3 voltage and current to be independently controlled four bridge legs, wherein
UoFor split capacitor mid-point voltage, U*For reference voltage, iLInductive current, the iN zero being connected for four bridge legs with split capacitor
Shaft current, iC are the electric current for flowing into split capacitor, final output UoModulation obtains the PWM modulation wave of four bridge legs, in conjunction with three-phase
The control of bridge arm solves caused three-phase electricity when each circuitry phase parameter in grid-connected or off-grid operation is inconsistent or certain mutually breaks down
Pressure exports asymmetric problem.
As shown in figure 4, the universal 3D-SVPWM control of three-phase four-wire three-level inverter under unbalanced load of the invention
Method processed, comprising the following steps:
(1) 27 kinds of three-phase output voltage combinations of states are obtained according to the switch state of each bridge arm of three-level inverter；
Since three-level inverter (by taking A phase as an example) has Q1Q2Closure, Q2Q3Closure, Q3Q4Three kinds of switch states are closed, it is fixed
Justice is P, O, N-state, and corresponding voltage output is0、Therefore the Switch State Combination in Power Systems of entire three-level inverter
Number is 33=27 kinds.
(2) it the amplitude transformations such as utilizes three-phase output voltage being converted into α β ο coordinate system, obtains corresponding base vector, and according to
Vector magnitude is divided into big vector, middle vector, small vector and zero vector；
Amplitude transformations are carried out etc. to three-phase output voltageObtain α β ο coordinate system
Interior base vector, as shown in table 1:
Table 1
Fig. 5 (a), corresponding three-dimensional space vectors figure under α β ο coordinate system are obtained after synthesis, wherein V01, V02, V03,
V04, V05 and V06 be pairs of small vector, V12, V23, V34, V45, V56 and V61 be middle vector, V1, V2, V3, V4, V5 and
V6 is big vector, and the vector at coordinate origin is zero vector, including zero axle is contrary, equal-sized a pair of of vector and width
The vector that value is zero.
(3) using the pairs of small vector in α β ο three-dimensional system of coordinate as translation vector, new coordinate origin and the origin are defined
Locate corresponding zero axle vector；
Based on α β ο three-dimensional system of coordinate, using the pairs of small vector in base vector as translation vector, the terminal for defining small vector is
Then three-dimensional space locating for space vector is divided into 6 three n-dimensional subspace ns, is converted to new coordinate origin by new coordinate origin
Under two level three-dimensional space, projection is to alpha-beta plane such as Fig. 5 (b) shown in, and subspace corresponds to and is projected as the sector I~VI, wherein A
~F is the new coordinate origin defined after carrying out coordinate translation as translation vector using small vector, the zero axle in each two level space
Vector is projection components of the pairs of translation vector in zero axle, contrary, differ in size.Extremely by the unified conversion of all base vectors
Two level spaces under new coordinate origin carry out sector division and Vector modulation, do not need additionally to divide inside and outside subspace, simplify
The algorithm that three-dimensional space divides, at the same at 6 sub-spaces and new coordinate origin zero axle vector definition so that each subspace
Interior vector effect has similitude with two level space SVPWM methods, to avoid complicated vector selection and can calculate.
(4) by 6 three-dimensional subspace projections after coordinate translation to alpha-beta plane, reference voltage sector is determined, zygote is empty
Between projection with zero axle vector, using two level space SVPWM methods carry out Vector modulation；
Since the division of three-dimensional space is not intuitive enough, 3 level space vector is projected to alpha-beta plane and divides 6 three-dimensional sons
Space, the two level three-dimensional space be converted under new coordinate origin are discussed, and the zero axle vector in each two level space is
Pairs of projection components of the translation vector in zero axle, it is contrary, differ in size.
By Fig. 5 (b) it is found that 3 level space vector is by six side ratios in the projection of alpha-beta planeRegular hexagon
Composition, intersection is divided into two, each small hexagon respectively accounts for half, can be by the throwing in plane by start vector of middle vector
Shadow is divided into I~VI totally 6 parts, and wherein A~F is the new coordinate defined after carrying out coordinate translation as translation vector using small vector
Origin, and new zero axle vector is defined at new coordinate origin, the then Vector Modulation and two in each sector, that is, subspace of plane
Level space SVPWM modulation is similar, and three level SVPWMs are converted to two level modes based on this and carry out Vector modulation.
The target vector of three level spaces and base vector are converted to two level first, table 2 reflects that target is sweared in each sector
Amount is in two level space alpha-beta axis component u'α、u'βWith three level space alpha-beta axis component uα、uβRelationship.
Table 2
In conjunction with zero axle vector of the above-mentioned two level subspace at the projection and new coordinate origin of alpha-beta plane, analogy two
Level space SVPWM control method determines the vector sequence of operation of each sector, it is known that falls in each small equilateral triangle subspace
Voltage target vector in sector differs in size by alpha-beta plane vector and new coordinate origin, contrary zero axle vector
Synthesis；The action time of zero axle vector is set to t1、t2、t01And t02, switch periods Ts, then each small equilateral triangle is fallen in
Voltage target vector calculating formula in the sector of shape subspace are as follows:
Wherein, U01、U02Positive and negative zero axle vector under respectively new coordinate system, UrefTarget vector is synthesized for three-phase voltage.
(5) vector expression is decomposed, the action time of zero axle vector is calculated, by the action time for adjusting the pairs of zero axle vector
The zero-sequence component generated by asymmetric load is compensated, the balance of voltage output is kept.
The vector calculating formula synthesized in step (4) is decomposed on three directions of α β ο coordinate system, and according to new coordinate
The zero axle vector defined at origin lists zero axle breakdown, then calculates separately in two level subspaces including zero axle vector
Each vector action time t1、t2、t01And t02, arrangement can obtain t1、t2Expression formula is similar to two level SVPWMs, as shown in table 3,
Middle variable X, Y, Z are as follows:
uα、uβIt is target vector in three level space alpha-beta axis components.
Table 3
But existing three level SVPWM control relatively, contrary in two level, three n-dimensional subspace n, a pair zero for differing in size
Axial vector U01、U02Action time t01、t02No longer impartial, therefore, it is not right that the action time by adjusting zero axle vector can compensate
The zero-sequence component for claiming load to generate.
By taking three-phase synthesis reference voltage vector is located at the first sector first community domain as an example, turn two level according to three level
Control mode determines switch periods TsInterior vector sequence of operation is POO-PON-PNN-ONN-PNN-PON-POO, according to vector meter
Formula solve differ in size in the region, contrary pairs of zero axle vector action time are as follows:
By adjusting the action time of zero axle vector in three n-dimensional subspace ns, the zero sequence generated by laod unbalance can be compensated
Component.
The present invention determines each bridge arm switching tube switch state using seven segmentation pulse trains, as shown in Fig. 6.Using above-mentioned
New universal 3D-SVPWM control method, pairs of zero axle vector action time t01、t02It is not of uniform size, so as to pass through
Adjust the zero sequence point that the action time compensation three-phase four-wire three-level inverter of the pairs of zero vector is generated by asymmetric load
Amount, keeps the balance of voltage output, achievees the purpose that compensate zero-sequence component when unbalanced load.
For T-type and NPC type topology, the control that four bridge legs are added can be independently of the three-phase under original 3D-SVPWM control
Four-wire system three-level inverter solves the problems, such as that neutral-point potential balance mentions for the lower addition four bridge legs of existing three level SVPWM control
Very big convenience is supplied.When acting on NPC type and T-type topology, it is possible to use four-wire system topology band unbalanced load, for zero sequence point
Amount provides access, and controls zero-sequence component；, it can be achieved that preceding when acting on NPC type and T-type topology that four bridge legs are added
Three bridge arms and four bridge legs independently control, and simplify the algorithm complexity of three level four bridge legs joint debuggings.
By taking T-type topology three-phase four-wire three-level inverter as an example, verifying is using the new universal 3D-SVPWM control
The feasibility of method.Simulating, verifying is carried out under three-phase balancing load to it first.Output when attached drawing 7 is three-phase balancing load
Voltage UabcWith electric current IabcWaveform diagram, three-phase, which fills, carries 4kW, it can be seen that when load balance, inverter output is stablized.
Ability of the inverter with unbalanced load under the control method is verified with degree of unbalancedness single-phase full load conditions the most serious.Attached drawing
8 carry output voltage U when 4kW for A facies tractabcWith electric current IabcWaveform diagram, three-phase voltage keeps balance in figure, verifies the controlling party
Inverter under case has preferable band unbalanced load ability.
Relatively existing common 3D-SVPWM control method, universal 3D-SVPWM control method of the invention define newly
Zero axle vector at coordinate origin swears the unified conversion of all base vectors to two level space synthesized references under new coordinate origin
Amount carries out unified discussion to the zero vector and redundancy small vector of former three level output, does not need during space divides
Consider that redundancy small vector additionally divides inside and outside subspace again, simplifies the algorithm of spatial sector division；6 three n-dimensional subspace ns simultaneously
Zero axle vector combines at the projection and new coordinate origin in alpha-beta plane, so that the vector in each sector (i.e. subspace)
Effect has similitude with two level space SVPWM methods, to avoid complicated vector selection and can calculate, have fine
Versatility.
Claims (6)
1. the universal 3D-SVPWM control method of three-phase four-wire three-level inverter under unbalanced load, which is characterized in that packet
Include following steps:
(1) 27 kinds of three-phase output voltage combinations of states are obtained according to the switch state of each bridge arm of three-level inverter；
(2) it the amplitude transformations such as utilizes three-phase output voltage being converted into α β ο coordinate system, obtains corresponding base vector；
(3) it using the pairs of small vector in α β o three-dimensional system of coordinate as translation vector, defines at new coordinate origin and the origin pair
Answer zero axle vector；
(4) 6 three-dimensional subspace projections after coordinate translation are determined reference voltage sector, thrown in conjunction with subspace to alpha-beta plane
Shadow and zero axle vector determine that vector sequence of operation carries out target vector synthesis using two level space SVPWM methods, obtain
Vector calculating formula；
(5) vector expression is decomposed, the action time of zero axle vector is calculated, the action time by adjusting the pairs of zero axle vector compensates
Because of the zero-sequence component that asymmetric load generates, the balance of voltage output is kept.
2. the universal 3D-SVPWM control of three-phase four-wire three-level inverter under unbalanced load according to claim 1
Method, it is characterised in that: carry out coordinate translation by translation vector of 6 pairs of small vectors in base vector in step (3), and by small arrow
The terminal of amount is defined as new coordinate origin, totally 6 new coordinate origins；Then three-dimensional space locating for space vector is divided
For 6 three n-dimensional subspace ns, two level three-dimensional space under new coordinate origin, the zero axle vector in each two level space are converted to
It is contrary, differ in size for projection components of the pairs of translation vector in zero axle.
3. the universal 3D-SVPWM control of three-phase four-wire three-level inverter under unbalanced load according to claim 1
Method, it is characterised in that: the zero axle arrow in step (4) according to subspace at the projection and new coordinate origin in alpha-beta plane
Amount, the vector sequence of operation of each sector is determined using two level space SVPWM methods, lists vector calculating formula are as follows:
Wherein, U01、U02Positive and negative zero axle vector under respectively new coordinate system, UrefTarget vector, t are synthesized for three-phase voltage1、
t2、t01And t02For the action time of zero axle vector, TsFor switch periods.
4. the universal 3D-SVPWM control of three-phase four-wire three-level inverter under unbalanced load according to claim 1
Method, it is characterised in that: divide the vector calculating formula synthesized in step (4) on three directions of α β ο coordinate system in step (5)
Solution, and zero axle breakdown is listed according to the zero axle vector at new coordinate origin, arrange to obtain t1、t2Expression formula and two level SVPWMs
It is similar, but contrary, a pair of of zero axle vector U for differing in size in three n-dimensional subspace ns01、U02Action time t01、t02No longer
Deng the action time by adjusting zero axle vector compensates zero-sequence component when achieving the purpose that unbalanced load.
5. the universal 3D- of three-phase four-wire three-level inverter under unbalanced load according to claim 1-4
SVPWM control method, which is characterized in that the three-phase four-wire three-level inverter that the control method is applicable in includes: NPC type three
Phase four-wire system three-level inverter, NPC type three-phase four-bridge arm tri-level inverter, T-type three-phase four-wire three-level inverter with
And T-type three-phase four-bridge arm tri-level inverter.
6. a kind of applicable control system of any one of claim 1-4 control method, which is characterized in that including three-phase bridge arm
3D-SVPWM control module and four bridge legs individual control module, the three-phase bridge arm 3D-SVPWM control module prime modulation three
Phase voltage and zero axle voltage obtain three-phase four-wire three-level inverter under unbalanced load target vector at each point of ο axis of α β
Amount, input 3D-SVPWM control carry out the synthesis of target vector, export the PWM modulation wave of three-phase bridge arm；Four bridge legs are independently controlled
Module samples zero-axis current processed exports four bridge legs PWM modulation wave through the bicyclic modulation of voltage and current；The system is suitable for NPC type
Three-phase four-bridge arm tri-level inverter and T-type three-phase four-bridge arm tri-level inverter.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110829466A (en) * | 2019-11-04 | 2020-02-21 | 郑州轻工业学院 | NPC three-level model prediction unbalance treatment method for combined switch state |
| CN110912435A (en) * | 2019-11-15 | 2020-03-24 | 中南大学 | Neutral point voltage balance control method of three-level inverter |
| CN111628671A (en) * | 2020-06-22 | 2020-09-04 | 厦门钨业股份有限公司 | Space vector modulation method and device of three-level converter |
| CN111669069A (en) * | 2020-06-02 | 2020-09-15 | 国网山西省电力公司电力科学研究院 | Control method of AC/DC bus interface converter with midpoint potential fluctuation suppression function |
| CN111900889A (en) * | 2020-07-29 | 2020-11-06 | 上海岩芯电子科技有限公司 | Neutral point potential control method for direct-current bus of three-phase four-wire three-level inverter |
| CN111953223A (en) * | 2020-08-12 | 2020-11-17 | 合肥工业大学 | Neutral point voltage balancing method for three-phase four-wire system three-level converter |
| CN112953278A (en) * | 2021-03-11 | 2021-06-11 | 青岛鼎信通讯股份有限公司 | SVPWM modulation method applied to APF |
| CN116827210A (en) * | 2023-08-24 | 2023-09-29 | 四川大学 | Three-dimensional space vector modulation method for open-winding motor |
| WO2024067836A1 (en) * | 2022-09-30 | 2024-04-04 | 上海正泰电源系统有限公司 | Voltage regulation method for three-phase four-bridge-arm three-level inverter |
| CN118074554A (en) * | 2024-02-29 | 2024-05-24 | 华中科技大学 | Neutral-point voltage balancing method of three-phase four-bridge arm three-level inverter |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102035423A (en) * | 2010-11-10 | 2011-04-27 | 上海兆能电力电子技术有限公司 | Three-phase four-wire three-level photovoltaic grid-connected connection inverter and control method thereof |
| CN103138619A (en) * | 2011-12-01 | 2013-06-05 | 苏州欧姆尼克新能源科技有限公司 | Zero-sequence component injection restraining neutral-point potential fluctuation method for three-phase three-level photovoltaic grid-connected inverter |
| CN104467005A (en) * | 2014-01-02 | 2015-03-25 | 艾伏新能源科技(上海)股份有限公司 | T-type three-level three-phase four-bridge-arm grid-connected photovoltaic power generation system and control method thereof |
| CN104506071A (en) * | 2015-01-21 | 2015-04-08 | 哈尔滨工业大学 | Suppression method for zero-sequence voltage caused by dual inverter switching dead area |
| CN105897028A (en) * | 2015-01-26 | 2016-08-24 | 北京鸿天盛达科技开发有限公司 | Voltage type synchronous inverter provided with neutral line, and control method thereof |
-
2018
- 2018-10-11 CN CN201811185994.3A patent/CN109347347B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102035423A (en) * | 2010-11-10 | 2011-04-27 | 上海兆能电力电子技术有限公司 | Three-phase four-wire three-level photovoltaic grid-connected connection inverter and control method thereof |
| CN103138619A (en) * | 2011-12-01 | 2013-06-05 | 苏州欧姆尼克新能源科技有限公司 | Zero-sequence component injection restraining neutral-point potential fluctuation method for three-phase three-level photovoltaic grid-connected inverter |
| CN104467005A (en) * | 2014-01-02 | 2015-03-25 | 艾伏新能源科技(上海)股份有限公司 | T-type three-level three-phase four-bridge-arm grid-connected photovoltaic power generation system and control method thereof |
| CN104506071A (en) * | 2015-01-21 | 2015-04-08 | 哈尔滨工业大学 | Suppression method for zero-sequence voltage caused by dual inverter switching dead area |
| CN105897028A (en) * | 2015-01-26 | 2016-08-24 | 北京鸿天盛达科技开发有限公司 | Voltage type synchronous inverter provided with neutral line, and control method thereof |
Non-Patent Citations (2)
| Title |
|---|
| WENXIN ZHAO ET AL.: ""Neutral Point Voltage Ripple Suppression for a"", 《 IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS》 * |
| 宋文祥 等: ""基于两类脉宽调制方式本质联系的三电平逆变器中点电压平衡控制的研究"", 《电工技术学报》 * |
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| CN110829466A (en) * | 2019-11-04 | 2020-02-21 | 郑州轻工业学院 | NPC three-level model prediction unbalance treatment method for combined switch state |
| CN110912435A (en) * | 2019-11-15 | 2020-03-24 | 中南大学 | Neutral point voltage balance control method of three-level inverter |
| CN111669069A (en) * | 2020-06-02 | 2020-09-15 | 国网山西省电力公司电力科学研究院 | Control method of AC/DC bus interface converter with midpoint potential fluctuation suppression function |
| CN111628671A (en) * | 2020-06-22 | 2020-09-04 | 厦门钨业股份有限公司 | Space vector modulation method and device of three-level converter |
| CN111900889B (en) * | 2020-07-29 | 2024-05-03 | 上海岩芯电子科技有限公司 | Neutral point potential control method for direct current bus of three-phase four-wire three-level inverter |
| CN111900889A (en) * | 2020-07-29 | 2020-11-06 | 上海岩芯电子科技有限公司 | Neutral point potential control method for direct-current bus of three-phase four-wire three-level inverter |
| CN111953223A (en) * | 2020-08-12 | 2020-11-17 | 合肥工业大学 | Neutral point voltage balancing method for three-phase four-wire system three-level converter |
| CN111953223B (en) * | 2020-08-12 | 2022-10-18 | 合肥工业大学 | Neutral point voltage balancing method for three-phase four-wire system three-level converter |
| CN112953278A (en) * | 2021-03-11 | 2021-06-11 | 青岛鼎信通讯股份有限公司 | SVPWM modulation method applied to APF |
| WO2024067836A1 (en) * | 2022-09-30 | 2024-04-04 | 上海正泰电源系统有限公司 | Voltage regulation method for three-phase four-bridge-arm three-level inverter |
| CN116827210B (en) * | 2023-08-24 | 2023-11-21 | 四川大学 | Three-dimensional space vector modulation method for open-winding motor |
| CN116827210A (en) * | 2023-08-24 | 2023-09-29 | 四川大学 | Three-dimensional space vector modulation method for open-winding motor |
| CN118074554A (en) * | 2024-02-29 | 2024-05-24 | 华中科技大学 | Neutral-point voltage balancing method of three-phase four-bridge arm three-level inverter |
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