CN107994758B - Space vector modulation method of nine-switch power converter - Google Patents
Space vector modulation method of nine-switch power converter Download PDFInfo
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- CN107994758B CN107994758B CN201711314058.3A CN201711314058A CN107994758B CN 107994758 B CN107994758 B CN 107994758B CN 201711314058 A CN201711314058 A CN 201711314058A CN 107994758 B CN107994758 B CN 107994758B
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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
- H02M1/00—Details of apparatus for conversion
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
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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
- 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
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Abstract
The invention provides a space vector modulation method of a nine-switch converter, which comprises the steps of judging hexagons where two reference voltage vectors are positioned by using original values of reference voltages at an upper alternating current end and a lower alternating current end; the two reference voltage vectors are respectively differenced with the hexagonal central vector, the two reference voltage vectors are converted from a voltage space vector plane of the nine-switch converter to a voltage vector space plane of the six-switch converter, the equivalent voltage vector of the six-switch converter is selected, and the action time of the equivalent voltage vector is determined; and mapping the six-switch converter voltage vector to a nine-switch converter voltage vector plane, and converting the action time of the six-switch converter voltage vector into the action time of the nine-switch converter voltage vector. The method has the advantages of easy understanding, simplification of the complexity of the modulation method of the nine-switch converter and convenience for digital realization. The method is helpful for understanding the working mechanism of the nine-switch converter, and has important practical value for the application of the nine-switch converter.
Description
Technical Field
The invention relates to a voltage space vector modulation method of a nine-switch power converter.
Background
With the continuous development of miniaturization, high reliability and low power consumption of power converters, various researchers have made a lot of work on the improvement of the topology of the power converters, and have achieved a lot of results. The nine-switch converter can realize the independent control of two three-phase current intersecting ends, compared with the traditional 12-switch back-to-back power converter, the three-phase current intersecting power converter has the advantages that switching devices and corresponding driving circuits are reduced in topological structure, the size is reduced, the power consumption of a system is reduced, and the voltage space vector plane partition of the nine-switch converter is shown in figure 1.
The nine-switch converter can simultaneously have two paths of three-phase alternating current outputs, can realize the independent control of two-phase three-phase alternating current loads, and can be operated in two modes of same-frequency operation and different-frequency operation.
Space vector modulation strategies are widely applied to control of power converters, and control of different types of power converters can be achieved by using the space vector modulation strategies, but the space vector modulation strategies of the power converters with different topological structures are different, and a voltage space vector modulation method of the nine-switch converter determines the working state of a switch device through voltage vectors of an upper alternating current output end and a lower alternating current output end together, rather than determining the switching state of the switch device through a single voltage vector in the traditional sense. Similarly, the modulation method of the nine-switch converter is also different from the modulation methods of other power converters.
Disclosure of Invention
The invention provides a space vector modulation method of a nine-switch converter and a control system thereof aiming at the working characteristics of the nine-switch converter.
In order to realize the control of the nine-switch converter under the working modes of the same frequency and different frequencies, the invention provides a voltage space vector modulation method of the nine-switch converter, which comprises the following steps:
① judging hexagons of the two reference voltage vectors by using the original values of the reference voltages of the upper and lower AC terminals;
② the two reference voltage vectors are respectively differenced with the hexagonal central voltage vector Vdc/3, the two reference voltage vectors are converted from the nine-switch converter voltage space vector plane to the six-switch converter voltage vector space plane, the six-switch converter equivalent voltage vector is selected, and the equivalent voltage vector action time is determined.
③ maps the six-switch converter voltage vector to a nine-switch converter voltage vector plane while converting the six-switch converter voltage vector on-time to a nine-switch converter voltage vector on-time.
The method has the advantages that the voltage space vector of the nine-switch converter is converted into the voltage space vector of the six-switch converter, the algorithm is easy to understand, the complexity of the modulation method of the nine-switch converter is greatly simplified, and the digitization is convenient to realize. The method is helpful for understanding the working mechanism of the nine-switch converter, has important reference value for the modulation of the multi-alternating-current-end converter, and has important practical value for the application of the nine-switch converter.
Drawings
FIG. 1 is a nine-switch converter voltage space vector plane partition;
FIG. 2 is a plane of the equivalent voltage space vector when two reference voltage vectors of the present invention are in the same sector;
FIG. 3 is a diagram of two reference voltage vectors of the present invention in the plane of the equivalent voltage space vector of the adjacent sector;
FIG. 4 is a diagram of two reference voltage vectors in the equivalent voltage space vector plane of a non-adjacent sector according to the present invention;
Detailed Description
The voltage space vector modulation method of the nine-switch converter of the invention is explained with reference to the attached drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto.
The voltage space vector modulation method of the nine-switch converter comprises the following steps:
①, judging the hexagon of two reference voltage vectors by using the original values of the upper and lower reference voltages, dividing the voltage vector space plane of the nine-switch converter into 6 sectors, wherein each sector corresponds to a hexagon which contains six voltage vectors and can be equivalent to the voltage vectors of the six-switch converter, and determining the sectors of the two reference voltages at the same time.
② the difference between the two reference voltage vectors and the hexagon center vector, converting the two reference voltage vectors from the nine-switch converter voltage space vector plane to the six-switch converter voltage vector space plane, selecting the six-switch converter equivalent voltage vector, and determining the equivalent voltage vector action time, when the two reference voltage vectors are in the same sector, reducing all the voltage vector lengths of the nine-switch voltage space vector plane to 1/2 of the original voltage vector length, and keeping the two reference voltage vectors unchanged;
two reference voltage vectors are used for respectively subtracting the central voltage vector in the hexagon in which the reference voltage vectors are positionedVdcThe voltage vector under the voltage space vector plane of the nine-switch converter is converted into the voltage vector under the voltage space vector plane of the six-switch converter through the/3;
when the two reference voltage vectors are in different sectors, the lengths of all the voltage vectors of the nine-switch voltage space vector plane are reduced to 1/4 of the length of the original voltage vector, and the two reference voltage vectors are kept unchanged;
two reference voltage vectors are used for respectively subtracting a central voltage vector V in a hexagon in which the reference voltage vectors are positioneddcAnd 6, converting the voltage vector under the voltage space vector plane of the nine-switch converter into the voltage vector under the voltage space vector plane of the six-switch converter.
③ maps the six-switch converter voltage vector to a nine-switch converter voltage vector plane while converting the six-switch converter voltage vector on-time to a nine-switch converter voltage vector on-time.
The voltage space vector modulation method of the nine-switch converter of the invention is realized by the following steps:
in the voltage space vector modulation method of the nine-switch converter, the topological structure of the nine-switch converter is provided with the voltage of a direct-current bus as VdcThe bridge arm has three working states for any bridge arm. Therefore, 27 voltage space vectors of the nine-switch converter can be obtained through the topological structure of the nine-switch converter, and the voltage space vectors of the nine-switch converter can be converted into a combination of two voltage vectors of the six-switch converter according to a voltage space vector comparison table of the nine-switch converter and the six-switch converter.
1. Dividing the nine-switch converter voltage space vector plane into 6 sectors, as shown in fig. 1, L1, L2, and L3 divide the nine-switch converter voltage space vector plane into 6 sectors, which are: i, II, III, IV, V and VI; each sector corresponds to a hexagon, and the voltage vector corresponding to each hexagon is consistent with the voltage space vector of the six-switch converter. The voltage space vector comparison table of the nine-switch converter and the six-switch converter disclosed by the invention is shown in the following table.
2. When the two reference voltage vectors are in the same sector, the nine-switch converter voltage space vector plane is reduced to the original voltage space vector plane 1/2, as shown in FIG. 2; two reference voltage vectors VU *、VL *Respectively associated with the voltage vector OO1′(VdcAnd/3) making a difference to obtain an equivalent vector V which is equivalent to a voltage vector plane of the six-switch converter from a voltage space vector plane of the nine-switch converterU *’And VL *’(ii) a V is obtained by using a six-switch converter voltage space vector modulation methodU *’And VL *’Equivalent resultant vector of, i.e. VU *’＝Tu2*V2+Tu3V3 and VL *’＝Tl1*V1+Tl2V2, wherein V2 and V3 can synthesize VU *’And the action time is respectively Tu2And Tu3(ii) a V1 and V2 can be synthesized into VL *’And the action time is respectively Tl1And Tl2。
Mapping the six-switch converter voltage vector to a nine-switch converter voltage vector plane to obtain a nine-switch converter voltage vector which may be V30, V22, V71, V72 or V20 if T isu2>Tl2The corresponding nine-switch converter voltage vectors are V30, V22, V71 and V20, and the action time of the corresponding nine-switch converter voltage vectors is Tu3、Tl2、Tl1、Tu2-Tl2(ii) a Otherwise, the corresponding nine-switch converter voltage vectors are V30, V22, V71 and V72, and the action time of the corresponding nine-switch converter voltage vectors is Tu3、Tu2、Tl1、Tl2-Tu2。
When the two reference voltage vectors are in different sectors, the nine-switch converter voltage space vector plane is reduced to the original voltage space vector plane 1/4, which is divided into the following two cases:
(1) if the sectors in which the two reference voltage vectors are located are adjacent, as shown in FIG. 3, the reference voltage vector V is madeU *And voltage vector OO2′(Vdc/6) making a difference, VL *And voltage vector OO1′(Vdc/6) making a difference to obtain an equivalent vector V which is equivalent to a voltage vector plane of the nine-switch converter to a voltage vector plane of the six-switch converterU *’And VL *’(ii) a V is obtained by using a six-switch converter voltage space vector modulation methodU *’And VL *’Equivalent resultant vector of, i.e. VU *’＝Tu3*V3+Tu4V4 and VL *’＝Tl2*V2+Tl3V3, wherein V3 and V4 can synthesize VU *’And the action time is respectively Tu3And Tu4(ii) a V2 and V3 can be synthesized into VL *’And the action time is respectively Tl2And Tl3。
Mapping the six-switch converter voltage vector to a nine-switch converter voltage space vector plane to obtain a nine-switch converter voltage vector which may be V40, V33, V72, V73 or V30 if T isu3>Tl3The corresponding nine-switch converter voltage vectors are V40, V33, V72 and V30, and the action time of the corresponding nine-switch converter voltage vectors is Tu4、Tl3、Tl2、Tu3-Tl3(ii) a Otherwise, the corresponding nine-switch converter voltage vectors are V40, V33, V72 and V73, and the action time of the corresponding nine-switch converter voltage vectors is Tu4、Tu3、Tl2、Tl3-Tu3。
(2) If the sectors in which the two reference voltage vectors are located are not adjacent, as shown in FIG. 4, the reference voltage vector V is madeU *And voltage vector OO3' do a difference, VL *And voltage vector OO1Making a difference to obtain the equivalent of a nine-switch converter voltage space vector plane to a six-switch converter voltage space vector planeEquivalent vector V of converter voltage vector planeU *’And VL *’(ii) a V is obtained by using a six-switch converter voltage space vector modulation methodU *’And VL *’Equivalent resultant vector of, i.e. VU *’＝Tu4*V4+Tu5V5 and VL *’＝Tl2*V2+Tl3V3, wherein V4 and V5 can synthesize VU *’And the action time is respectively Tu4And Tu5(ii) a V2 and V3 can be synthesized into VL *’And the action time is respectively Tl2And Tl3. Mapping the six-switch converter voltage vector to a nine-switch converter voltage vector plane to obtain nine-switch converter voltage vectors of V40, V50, V72 and V73, wherein the action time of the corresponding nine-switch converter voltage vector is Tu4、Tu5、Tl2、Tl3。
3. And (3) obtaining a nine-switch converter voltage vector represented by two six-switch vector combinations and action time of the corresponding nine-switch converter voltage vector according to the step (2), carrying out vector selection according to a vector sequence formulated by a principle of minimum change state, and decoding the switch state corresponding to each bridge arm of the nine-switch converter so as to finally obtain a drive waveform of a switch device of the nine-switch converter.
Claims (1)
1. A nine-switch converter voltage space vector modulation method is characterized in that: the nine-switch converter is used for dragging independent double loads, a voltage space vector plane of the nine-switch converter is divided into 6 sectors, the six sectors respectively correspond to a small hexagon, the small hexagon corresponding to each sector contains six voltage vectors, and the six voltage vectors can be equivalent to the voltage vectors of the six-switch converter under the constraint condition; determining sectors where two reference voltage vectors of upper and lower alternating current ends of an independent double load dragged by the nine-switch converter are located, and converting a voltage space vector plane of the nine-switch converter into a voltage space vector plane of a three-phase six-switch converter; the specific method comprises the following steps: converting a sector in which two reference voltage vectors at an upper alternating current end and a lower alternating current end of an independent double load dragged by the nine-switch converter are located into a voltage space vector plane of the three-phase six-switch converter to select an equivalent voltage vector of the three-phase six-switch converter, and determining the action time of the equivalent voltage vector under the space vector of the three-phase six-switch converter; when the two reference voltage vectors are in the same sector, the lengths of all the voltage vectors of the nine-switch voltage space vector plane are reduced to 1/2 of the length of the original voltage vector, and the two reference voltage vectors are kept unchanged; the 1/3 of the central voltage vector Vdc/3 in the hexagon where the vector is positioned, namely the direct-current bus voltage Vdc, is respectively subtracted from the two reference voltage vectors to obtain the voltage vector converted from the voltage space vector plane of the nine-switch converter to the voltage vector plane of the three-phase six-switch converter; when the two reference voltage vectors are in different sectors, the lengths of all the voltage vectors of the nine-switch voltage space vector plane are reduced to 1/4 of the length of the original voltage vector, and the two reference voltage vectors are kept unchanged; the central voltage vector Vdc/6 in the hexagon where the vector is positioned, namely 1/6 of the direct-current bus voltage Vdc, is respectively subtracted from the two reference voltage vectors to obtain a voltage vector converted from a voltage space vector plane of the nine-switch converter to a voltage vector of a voltage space vector plane of the three-phase six-switch converter; and finally, mapping the voltage vector of the three-phase six-switch converter to a voltage space vector plane of the nine-switch converter, and converting the action time of the voltage vector of the three-phase six-switch converter into the action time of the voltage vector of the nine-switch converter.
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| CN110417060B (en) * | 2019-09-06 | 2024-05-31 | 天津城建大学 | Nine-switch type double-fed fan system and control method |
| CN111245265B (en) * | 2020-03-05 | 2021-02-05 | 天津城建大学 | Nine-switch converter voltage space vector modulation method and system |
| CN111342722B (en) * | 2020-04-06 | 2022-02-15 | 华中科技大学 | Nine-switch driving system for magnetic field modulation switched reluctance motor and control method |
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| JP2008154318A (en) * | 2006-12-14 | 2008-07-03 | Meiji Univ | Nine switch inverter independently driving two ac motor units and its control method |
| CN103986356A (en) * | 2014-05-13 | 2014-08-13 | 湖南大学 | Control system and method of cascaded multi-level inverter |
| CN104320012A (en) * | 2014-11-18 | 2015-01-28 | 河南城建学院 | Five-level simplified algorithm based on three levels |
| CN105871240A (en) * | 2016-05-18 | 2016-08-17 | 天津城建大学 | Direct power control system of nine-switch converter and control method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008154318A (en) * | 2006-12-14 | 2008-07-03 | Meiji Univ | Nine switch inverter independently driving two ac motor units and its control method |
| CN103986356A (en) * | 2014-05-13 | 2014-08-13 | 湖南大学 | Control system and method of cascaded multi-level inverter |
| CN104320012A (en) * | 2014-11-18 | 2015-01-28 | 河南城建学院 | Five-level simplified algorithm based on three levels |
| CN105871240A (en) * | 2016-05-18 | 2016-08-17 | 天津城建大学 | Direct power control system of nine-switch converter and control method |
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Effective date of registration: 20230328 Address after: Building 3, Jinbige Community, No. 65 Jiefang Road, Nanguan District, Changchun City, Jilin Province, 130022 Patentee after: Kunyu Intelligent Control (Jilin) Technology Co.,Ltd. Address before: 300384 No. 26, Jing Jing Road, Xiqing District, Tianjin Patentee before: Tianjin Chengjian University |