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Space vector pulse width modulation method and device

A technology of space vector pulse width and modulation method, applied in the field of three-level space vector pulse width modulation method and device, can solve the problems of harmonic characteristics, poor neutral point voltage balance suppression effect, underutilization of three-level, etc.

Inactive Publication Date: 2019-08-13
CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the object of the present invention is to provide a kind of space vector pulse width modulation method and device, to solve the redundant (voltage) vector pair that existing space vector pulse width modulation mode does not fully utilize three levels, harmonic characteristic and The technical problem of poor midpoint voltage balance suppression effect

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  • Space vector pulse width modulation method and device
  • Space vector pulse width modulation method and device

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Embodiment 1

[0180] As attached figure 1 Shown is the main circuit topology of an NPC three-level inverter (ie, converter 10). Attached figure 1 In, the inverter output AC voltage is realized by controlling the on and off state of the three-phase bridge arm switch tube. Taking the A-phase output as an example, the corresponding relationship between the A-phase output terminal voltage and the on-state of the switch is shown in Table 1 below (where 1 means on and 0 means off).

[0181] Table 1 Correspondence between A-phase output terminal voltage and switch on state

[0182]

[0183] Similarly, phases B and C also have the same switch state corresponding relationship described above.

[0184] Therefore, in the three-level inverter circuit of the converter 10, there are three switching states of each phase: -U dc / 2(N), 0(O), U dc / 2(P). For a three-phase symmetric system, a total of 3 3 = 27 switch states, each switch state corresponds to a basic (voltage space) vector, as attached figure 2...

Embodiment 2

[0293] As attached Figure 5 As shown, a specific embodiment of a space vector pulse width modulation device used for modulation of a converter 10 includes:

[0294] Sector judging unit 1, judging the reference voltage vector The sector

[0295] Triangular area judgment unit 2, according to the reference voltage vector Reference voltage vector for judgment of the sector in which it is located The triangular area in which it is located;

[0296] The basic vector action time calculation unit 3, according to the reference voltage vector It is in the triangular area, calculated to synthesize the reference voltage vector The action time of each basic vector;

[0297] The basic vector fitting arrangement unit 4, according to the redundant vector pair in the basic vector, make full use of s / 2 is axisymmetric distribution, and the zero vector is T s / 4 is axisymmetric distribution, and the basic vector fitting arrangement is performed, T s Is the switching period of the three-phase bridg...

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Abstract

The invention discloses a space vector pulse width modulation method and device which are used for converter modulation. The method comprises the following steps: judging a sector where a reference voltage vector is located; judging a triangular area where the reference voltage vector is located; calculating the action time of each basic vector for synthesizing the reference voltage vector according to the triangular region where the reference voltage vector is located; according to redundant vector pairs in the basic vectors, fully utilizing and symmetrically distributing the redundant vectorpairs with Ts / 2 as the axis, symmetrically distributing zero vectors with Ts / 4 as the axis, and carrying out basic vector fitting arrangement, wherein Ts is the switching period of the three-phase bridge arm switching device of the converter; and according to the action time of each basic vector and the fitting arrangement mode, obtaining a driving signal of each switch device of the three-phasebridge arm of the converter, and outputting a voltage. The technical problems that in an existing space vector pulse width modulation mode, a three-level redundant (voltage) vector pair is not fully utilized, and the harmonic characteristic and neutral-point voltage balance inhibition effect are poor can be solved.

Description

Technical field [0001] The present invention relates to the technical field of variable current control, in particular to a three-level space vector pulse width modulation method and device. Background technique [0002] In high-voltage and large-capacity power electronic conversion systems such as medium and high voltage variable frequency speed regulation, grid reactive power compensation, etc., the neutral point clamped three-level inverter is the most mature multi-level inverter currently researched and applied. One of the converter topologies. Compared with the traditional two-level inverter, the three-level inverter has the characteristics of low withstand voltage requirements for power devices and low harmonic content of the output voltage, so it has been increasingly widely used. [0003] For voltage-type inverters, the output performance of the inverter mainly depends on the modulation algorithm. Among them, the space vector modulation technology (SVPWM, Space Vector Puls...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387H02M7/5395H02M1/12
CPCH02M1/12H02M7/53875H02M7/5395H02M1/0038H02M7/53876
Inventor 许峻峰梅文庆刘勇甘韦韦胡亮许为南永辉胡仙贾岩吕永灿
Owner CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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