CN107508477A - Three-phase Two-arm symmetry Three-level PWM Rectifier control method based on multimodal switchover - Google Patents

Three-phase Two-arm symmetry Three-level PWM Rectifier control method based on multimodal switchover Download PDF

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CN107508477A
CN107508477A CN201710515438.7A CN201710515438A CN107508477A CN 107508477 A CN107508477 A CN 107508477A CN 201710515438 A CN201710515438 A CN 201710515438A CN 107508477 A CN107508477 A CN 107508477A
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voltage vector
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CN107508477B (en
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李志忠
杨慧
刘东峰
童怀
李优新
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Guangdong University of Technology
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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
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc 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
    • H02M7/217—Conversion of ac power input into dc 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
    • H02M7/219—Conversion of ac power input into dc 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 in a bridge configuration
    • 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
    • H02M1/0048—Circuits or arrangements for reducing losses
    • H02M1/0054—Transistor switching losses
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)

Abstract

The invention discloses a kind of Three-phase Two-arm symmetry Three-level PWM Rectifier control method of multimodal switchover, methods described is controlled by the combination different in six different operating sectors of 18 operation modes and realized, specifically includes following steps：1) big sector N where determining Three-phase Two-arm symmetry Three-level PWM Rectifier input reference voltage vector；2) small delta-shaped region n where determining reference voltage vector, obtains three operation modes corresponding with place sector, synthesized voltage vector；3) working time of three operation modes is determined；4) switching sequence of three operation modes is generated according to the working time；5) three operation mode synthesized voltage vectors are controlled according to switching sequence, exports DC voltage.The control method of the present invention is in the case of same DC voltage is exported, and compared with SVPWM control strategies, circuit mode quantity reduces 1/3, and power switch pipe on-off times reduce 2/3, so as to effectively reduce the switching loss of Three-phase Two-arm symmetry Three-level PWM Rectifier.

Description

Three-phase Two-arm symmetry Three-level PWM Rectifier control method based on multimodal switchover
Technical field
The present invention relates to PWM rectifier control technology field, belongs to electric energy conversion application field.
Background technology
Three-phase rectifier is widely applied to electric power, electronics, led to as power electronic equipment indispensable in commercial Application Each production division of the national economies such as letter, communications and transportation, health care and the daily life of the people.However, with three The increase of commutating phase device power, and the raising of the switching frequency of power switch pipe, the switching of switching tube in pulse width modulation cycle Number increases with the raising of switching frequency so that the switching loss of power switch pipe is increasing, it has also become restricts Gao Gong One key issue of rate density rectifier development.
At present, conventional three-phase tri-level rectifier control strategy is that (full name is Space Vector Pulse to SVPWM Width Modulation, i.e. space vector pulse width modulation), (full name is Pulse Width with traditional sine pulse width modulation (PWM) for it Modulation, i.e. pulse width modulation) strategy compares, and the harmonic component of output current wave is small, and voltage stress is low, and directly The utilization rate for flowing busbar voltage is higher, it is easier to Digital Control.
Three-phase tri-level rectifier shares 27 kinds of on off states, the various combination switched according to three bridge arms, and rectifier is common Export 27 basic voltage vectors, including six big vector, six middle vectors, 12 small vectors and two zero vectors. Space voltage vector figure is divided into six 60 ° of sector, thus obtains the polar plot of each space vector in a coordinate system such as Fig. 1 It is shown.Three-phase rectifier SVPWM control strategies are to be defined on mutual deviation from mathematical angle, each phase voltage of three-phase inverter 120 ° of plane coordinates is fastened, and by three-phase input voltage Ua、Ub、UcIt is transformed into blended space vector U on complex planeref.Its In,By determining reference voltage vector UrefPlace sector, using nearest triangular vector Compositional rule determine output vector, calculate the time of each vector effect, SVPWM on off sequences obtained according to action time.
Three-phase Two-arm symmetry Three-level PWM Rectifier control strategy SVPWM uses 27 kinds of on off state Fitted reference voltage vectors, shortcoming Be switching tube in pulse width modulation cycle switching times more cause its switching loss big.The efficiency of rectified three-phase circuit mainly takes Certainly in switching tube characteristic, switching frequency, circuit structure and control strategy.Under particular switch frequency, if switching tube characteristic with And circuit structure will be it has been determined that its efficiency will be directly affected by control strategy.Therefore, to the further essence of SVPWM on off sequences Letter just seems very significant.
The content of the invention
The shortcomings that it is a primary object of the present invention to overcome prior art and deficiency, solve this by simplifying on off sequence One defect, on the basis of the switched linear system model under traditional SVPWM control strategies are modulated, carrying out system to it can control Property analysis, according to the concept of the minimum mode controllability of proposition, propose that one kind can effectively reduce three-phase rectifier switch frequency Rate and the Three-phase Two-arm symmetry Three-level PWM Rectifier control method based on 18 Mode-switchs of loss.
The control method of Three-phase Two-arm symmetry Three-level PWM Rectifier based on multimodal switchover, methods described pass through 18 work Mode combination control different in six different operating sectors is realized, is comprised the following steps：
A. big sector N where determining the reference voltage vector that Three-phase Two-arm symmetry Three-level PWM Rectifier need to input；
B. small delta-shaped region n where determining reference voltage vector, is obtained corresponding with place sector, synthesized voltage vector Three operation modes；
C. the working time of three operation modes is determined；
D. the switching sequence of three operation modes is generated according to the working time；
E. three operation mode synthesized voltage vectors are controlled according to switching sequence, it is exported three-phase PWM by circular trace The DC voltage of rectifier.
The present invention is mainly from System Controllability, in the case where ensureing that system mode is controllable, by three-phase tri-level PWM The operation mode of rectification circuit is reduced to 18 operation modes from 27, has simplified on off sequence, has reduced on-off times, from And reduce switching loss.The efficiency of rectified three-phase circuit depend primarily on switching tube characteristic, switching frequency, circuit structure and Control strategy.Most of Three-phase Two-arm symmetry Three-level PWM Rectifier efficient studies all concentrate on the optimum option of switching device and circuit is opened up The improvement flutterred, and it is of the invention under particular switch frequency, in the case of switching tube characteristic and circuit structure, from control strategy Angle improve Three-phase Two-arm symmetry Three-level PWM Rectifier efficiency.
Brief description of the drawings
Fig. 1 be in the present invention space vector in the distribution of reference axis；
Fig. 2 is 18 operation modes that the present invention applies to；
Fig. 3 is the operation interval division of the present invention；
Fig. 4 is the first sector of the present invention；
Fig. 5 a are the operation mode U of the first sector in the present invention01(100)；
Fig. 5 b are the operation mode U of the first sector in the present invention02(00-1)；
Fig. 5 c are the operation mode U of the first sector in the present invention12(10-1)；
Fig. 5 d are the operation mode U of the first sector in the present invention1(1-1-1)；
Fig. 5 e are the operation mode U of the first sector in the present invention2(11-1)；
The small delta-shaped region that Fig. 6 is the present invention judges；
Fig. 7 a are the on off sequences (18PWM) of the small delta-shaped region N1 (N2) of the first sector of the invention；
Fig. 7 b are the on off sequences (18PWM) of the small delta-shaped region N3 (N4) of the first sector of the invention；
Fig. 7 c are the small delta-shaped region N5 of the first sector of the invention on off sequences (18PWM)；
Fig. 7 d are the small delta-shaped region N6 of the first sector of the invention on off sequences (18PWM).
Embodiment
Step A is specific as follows：
The space distribution situation of 18 operation modes is illustrated in figure 2, the six work sector is in static coordinate alpha-beta In two-phase reference axis, counterclockwise it is divided into using α axles as starting point：First sector, 0~60 degree；Second sector, 60~120 Degree；3rd sector, 120~180 degree, the 4th sector, 180~240 degree；5th sector, 240~300 degree；6th sector, 240 ~360 degree.The distribution of its operation interval corresponds to shown in Fig. 3.If three-phase rectifier voltage vector Uref, give UrefAmplitude and phase Angle, in static coordinate alpha-beta two-phase reference axis, UrefComponent U thereonαAnd UβTo represent, sector is by with following formula where it (1) determine：
If X ＞ 0, m=1, otherwise m=0；If Y ＞ 0, n=1, otherwise n=0；If Z ＞ 0, p=1, otherwise p=0. S=m+2n+4p is made, then as S=3, voltage vector is located at the first sector N1；As S=1, voltage vector is located at the second sector N2；As S=5, voltage vector is located at the 3rd sector N3；As S=4, voltage vector is located at the 4th sector N4；As S=6, Voltage vector is located at the 5th sector N5；As S=2, voltage vector is located at the 6th sector N6；
Step B is specific as follows：
Second to the 6th sector shown in Fig. 2 can reach the position of the first sector by rotating a certain angle. Therefore the sector of weight analysis first is only needed, other sectors can be by that analogy.From the figure 3, it may be seen that in sector N1, ua＞ 0, ub＜ 0,uc＜ 0, thus the sense of current be A phase currents be just, B phase currents and C phase currents be negative.
Such as the distribution situation of Fig. 4 operation modes included by the first sector.
As shown in Fig. 5 a~5e, the operation mode of the first sector is respectively：Operation mode U01(100), switching tube Qb2 and Qc2 is turned on, switching tube Qa1, Qa2, Qb1 and Qc1 cut-off；Operation mode U12(10-1), switching tube Qb2 conductings, switching tube Qa1, Qa2, Qb1, Qc1 and Qc2 end；Operation mode U02(00-1), switching tube Qa1 and Qb2 conducting, switching tube Qa2, Qb1, Qc1 End with Qc2；Operation mode U1(1-1-1), switching tube Qa1, Qa2, Qb1, Qb2, Qc1 and Qc2 all end；Operation mode U2 (11-1), switching tube Qa1, Qa2, Qb1, Qb2, Qc1 and Qc2 all end.
By taking the first sector N1 as an example, as shown in fig. 6, line segment 1,2,3 and just by 1,2,3,4,5,6 this six small triangles Shape separates, therefore this three line segments can turn into small delta-shaped region n basis for estimation, and its criterion is as follows：
Criterion one：
Criterion two：
Criterion three：
Criterion four：
If criterion two is true and criterion four is true, n=1, by operation mode U100、U00-1And U000Synthesis；If criterion two It is true and criterion four is false, then n=2, by operation mode U100、U00-1And U000Synthesis；If criterion two is false and criterion three Very, then n=5, by operation mode U10-1、U00-1And U11-1Synthesis；If criterion one is true and criterion three is false, n=6, by work Make mode U100、 U10-1And U1-1-1Synthesis；It is that false and criterion one is true, n=3 that if criterion two, which is false and criterion three, by working Mode U100、U00-1And U10-1Synthesis；Otherwise if criterion two is that false and criterion three is that false and criterion one is false, n=4, by working Mode U100、U00-1And U10-1Synthesis.
Similarly, the judgement of small delta-shaped region is also in this way, its criterion is as shown in table 1 below in other five big region.
Table 1
Step C is specific as follows：
By taking the first sector N1 as an example：
If a) voltage vector UrefPositioned at small Delta Region n1 or n2, by operation mode U100、U00-1And U000Synthesis, then UrefTs=U100T100+U00-1T00-1+U000T000, wherein T100It is operation mode U100Working time, T00-1It is operation mode U00-1 Working time, T000It is operation mode U000Working time, and have Ts=T100+T00-1+T000U is setrefAngle with α axles is θ, three-phase rectifier DC bus-bar voltage are Udc, then have：
Operation mode U is determined by formula (2)100、U00-1And U000Time it is as follows：
If b) voltage vector UrefPositioned at small Delta Region n3 or n4, by operation mode U100、U10-1And U00-1Synthesis, then UrefTs=U100T100+U00-1T00-1+U10-1T10-1, wherein T100It is operation mode U100Working time, T00-1It is operation mode U00-1Working time, T10-1It is operation mode U10-1Working time, and have Ts=T100+T00-1+T10-1U is setrefWith α axles Angle is θ, and three-phase rectifier DC bus-bar voltage is Udc, then have：
Operation mode U is determined by formula (4)100、U10-1And U00-1Time it is as follows：
If c) voltage vector UrefPositioned at small Delta Region n5, by operation mode U00-1、U10-1And U11-1Synthesize, then UrefTs =U00-1T00-1+U10-1T10-1+U11-1T11-1, wherein T11-1It is operation mode U11-1Working time, T00-1It is operation mode U00-1Working time, T10-1It is operation mode U10-1Working time, and have Ts=T11-1+T00-1+T10- 1. set UrefWith α axles Angle is θ, and three-phase rectifier DC bus-bar voltage is Udc, then have：
Operation mode U is determined by formula (6)11-1、U10-1And U00-1Time it is as follows：
If d) voltage vector UrefPositioned at small Delta Region n6, by operation mode U100、U10-1And U1-1-1Synthesize, then UrefTs =U100T100+U10-1T10-1+U1-1-1T1-1-1, wherein T1-1-1It is operation mode U1-1-1Working time, T100It is operation mode U100Working time, T10-1It is operation mode U10-1Working time, and have Ts=T1-1-1+T100+T10-1U is setrefWith α axles Angle is θ, and three-phase rectifier DC bus-bar voltage is Udc, then have：
Operation mode U is determined by formula (8)1-1-1、U10-1And U100Time it is as follows：
Step D is specific as follows：
By taking the first sector N1 as an example：
If 1) voltage vector UrefDuring positioned at small Delta Region n1 or n2, switching sequence is generated as shown in Figure 7a, current period Operation mode U during beginning100It is in running order, allow operation mode U100Continuous firing T100/ 2 times reached a shown in Fig. 7 a Point, is then switched to zero vector, and zero vector continues T000/ 2 times reached b points shown in Fig. 7 a, were then switched to operation mode U00-1, operation mode U00-1Work T00-1Terminate after time, i.e., c points shown in Fig. 7 a, switch to zero vector until T000/ 2 times Terminate, i.e., d points shown in Fig. 7 a, be eventually switched to operation mode U100And work to end cycle；Such as A, B, C below Fig. 7 a Shown in the control of three-phase bridge arm, at the S1 of A phase bridge arms, become 0 from 1, i.e. switching tube Qa1 is open-minded；At the S2 of C phase bridge arms, become -1 from 0, That is switching tube Qc2 is turned off；B phase bridge arms are always maintained at constant state 0；It can be seen that in the three-phase bridge arm control of a cycle, it is preceding The switching tube Qa1 of half period A phase bridge arm is opened once, and the switching tube Qc2 shut-offs of C phase bridge arms are once；Later half cycle A phase bridge arms Switching tube Qa1 shut-off once, the switching tube Qc2 of C phase bridge arms is opened once, that is, is switched totally 4 times.
If 2) voltage vector UrefDuring positioned at small Delta Region n3 or n4, switching sequence is generated as shown in Figure 7b, current period Operation mode U during beginning100It is in running order, allow operation mode U100Continuous firing T100/ 2 times reached a shown in Fig. 7 b Point, it is then switched to operation mode U10-1, operation mode U10-1Continue T10-1/ 2 times reached b points shown in Fig. 7 b, then cut Shift to operation mode U00-1, operation mode U00-1Work T00-1Terminate after time, i.e., c points shown in Fig. 7 b, be then switched to work Make mode U10-1, operation mode U10-1Continue T10-1/ 2 times terminated, i.e., d points shown in Fig. 7 b, are eventually switched to operation mode U100And work to end cycle；As shown in A, B, C three-phase bridge arm control below Fig. 7 b, at the S1 of A phase bridge arms, become 0 from 1, That is switching tube Qa1 is open-minded；At the S2 of C phase bridge arms, become -1 from 0, i.e. switching tube Qc2 shut-offs；B phase bridge arms are always maintained at constant State 0；It can be seen that in the three-phase bridge arm control of a cycle, the switching tube Qa1 of first half cycle A phase bridge arms is opened once, C phases The switching tube Qc2 shut-offs of bridge arm are once；The switching tube Qa1 of later half cycle A phase bridge arms is turned off once, the switching tube of C phase bridge arms Qc2 is opened once, that is, is switched totally 4 times.
If 3) voltage vector UrefDuring positioned at small Delta Region n5, as shown in Figure 7 c, current period starts generation switching sequence When operation mode U00-1It is in running order, allow operation mode U00-1Continuous firing T00-1/ 2 times reached a points shown in Fig. 7 c, It is then switched to operation mode U10-1, operation mode U10-1Continue T10-1/ 2 times reached b points shown in Fig. 7 c, were then switched to Operation mode U11-1, operation mode U11-1Work T11-1Terminate after time, i.e., c points shown in Fig. 7 c, switch to operation mode U10-1Continue T10-1/ 2 times terminated, i.e., d points shown in Fig. 7 c, are eventually switched to operation mode U00-1And work to the cycle and tie Beam；As shown in A, B, C three-phase bridge arm control below Fig. 7 c, at the S1 of A phase bridge arms, it is changed into 1 from 0, i.e. switching tube Qa1 shut-offs； At the S2 of B phase bridge arms, it is changed into 1 from 0, i.e. switching tube Qb1 shut-offs；C phase bridge arms are always maintained at constant state 0；It can be seen that at one In the three-phase bridge arm control in cycle, once, the switching tube Qb1 of B phase bridge arms is closed for the switching tube Qa1 shut-offs of first half cycle A phase bridge arms Break once；The switching tube Qa1 of later half cycle A phase bridge arms is opened once, and the switching tube Qb1 of B phase bridge arms is opened once, that is, is switched Totally 4 times.
If 4) voltage vector UrefDuring positioned at small Delta Region n6, as shown in figure 7d, current period starts generation switching sequence When operation mode U100It is in running order, allow operation mode U100Continuous firing T100/ 2 times reached a points shown in Fig. 7 d, so After switch to operation mode U10-1, operation mode U10-1Continue T10-1/ 2 times reached b points shown in Fig. 7 d；It is then switched to work Make mode U1-1-1, operation mode U1-1-1Work T1-1-1Terminate after time, i.e., c points shown in Fig. 7 d；Switch to operation mode U10-1 Until T10-1/ 2 times terminated, i.e., d points shown in Fig. 7 d；It is eventually switched to operation mode U100And work to end cycle；Such as Shown in A, B, C three-phase bridge arm control below Fig. 7 d, at the S1 of B phase bridge arms, it is changed into -1 from 0, i.e. switching tube Qb1 shut-offs；C phases At the S2 of bridge arm, it is changed into -1 from 0, i.e. switching tube Qc2 shut-offs；A phase bridge arms are always maintained at constant state 1；It can be seen that in a week In the three-phase bridge arm control of phase, once, the switching tube Qc2 of C phase bridge arms is turned off for the switching tube Qb1 shut-offs of first half cycle B phase bridge arms Once；The switching tube Qb1 of later half cycle B phase bridge arms is opened once, and the switching tube Qc2 of C phase bridge arms is opened once, that is, switchs totally 4 It is secondary.
The specific embodiment of the present invention is described above.It is to be appreciated that the invention is not limited in above-mentioned Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow Ring the substantive content of the present invention.

Claims (3)

  1. A kind of 1. control method of the Three-phase Two-arm symmetry Three-level PWM Rectifier based on multimodal switchover, it is characterised in that：Methods described is led to Cross the combination control different in six different operating sectors of 18 operation modes to realize, comprise the following steps：
    A. big sector N where determining the reference voltage vector that Three-phase Two-arm symmetry Three-level PWM Rectifier need to input；
    B. small delta-shaped region n where determining reference voltage vector, obtains corresponding with place sector, synthesized voltage vector three Operation mode；
    C. the working time of three operation modes is determined；
    D. the switching sequence of three operation modes is generated according to the working time；
    E. three operation mode synthesized voltage vectors are controlled according to switching sequence, it is exported three-phase rectifier by circular trace DC voltage.
  2. 2. control method according to claim 1, it is characterised in that：The step A is specifically：
    If three-phase rectifier voltage vector Uref, give UrefAmplitude and phase angle, in static coordinate alpha-beta two-phase reference axis, Uref Component U thereonαAnd UβTo represent, sector where it with following formula (1) by being determined：
    <mrow> <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <mi>X</mi> <mo>=</mo> <msub> <mi>U</mi> <mi>&amp;beta;</mi> </msub> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mi>Y</mi> <mo>=</mo> <msqrt> <mn>3</mn> </msqrt> <msub> <mi>U</mi> <mi>&amp;alpha;</mi> </msub> <mo>-</mo> <msub> <mi>U</mi> <mi>&amp;beta;</mi> </msub> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mi>Z</mi> <mo>=</mo> <msqrt> <mn>3</mn> </msqrt> <msub> <mi>U</mi> <mi>&amp;alpha;</mi> </msub> <mo>+</mo> <msub> <mi>U</mi> <mi>&amp;beta;</mi> </msub> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow>
    If X ＞ 0, m=1, otherwise m=0；If Y ＞ 0, n=1, otherwise n=0；If Z ＞ 0, p=1, otherwise p=0；Make S =m+2n+4p, then as S=3, voltage vector is located at the first sector N1；As S=1, voltage vector is located at the second sector N2； As S=5, voltage vector is located at the 3rd sector N3；As S=4, voltage vector is located at the 4th sector N4；As S=6, voltage Vector is located at the 5th sector N5；As S=2, voltage vector is located at the 6th sector N6.
  3. 3. control method according to claim 2, it is characterised in that：The basis for estimation of step B the first sector is as follows：
    Criterion one：
    Criterion two：
    Criterion three：
    Criterion four：
    Wherein, if UrefAngle with α axles is θ, and three-phase rectifier DC bus-bar voltage is Udc。
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Cited By (2)

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CN109831136A (en) * 2019-04-12 2019-05-31 广东工业大学 A kind of driving method of three phase alternating current motor, system and device
CN109889115A (en) * 2019-04-12 2019-06-14 广东工业大学 A kind of driving method, system and the device of improved three-phase alternating current generator

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