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Modulating method and system of 3 level space vector

A technology of space vector and modulation method, which is applied in the field of three-level space vector modulation method and system, and can solve problems such as complex calculation structure

Active Publication Date: 2009-01-07
ZHUZHOU CSR TIMES ELECTRIC CO LTD
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Problems solved by technology

[0022] In the existing technology, the calculation of the action time of the basic space vector needs to

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  • Modulating method and system of 3 level space vector
  • Modulating method and system of 3 level space vector
  • Modulating method and system of 3 level space vector

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Embodiment Construction

[0145] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0146] see Figure 4 , the flow chart of the first embodiment of the three-level space vector modulation method of the present invention.

[0147] S401: Convert the reference space vector to the first sector.

[0148] Divide the three-level voltage space vector plane into six sectors with an angle of 60 degrees, and set the sector with an angle of 60 degrees counterclockwise to the horizontal line as the first sector, and the first sector is counterclockwise The second, third, fourth, fifth, and sixth sectors are arranged in sequence.

[0149] S402: Transform the reference space vector of the first sector into an α-β coordinate system, where the α-axis coincides with the x-axis of the Cartesian coordinate system, and the β-axis ...

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Abstract

The invention discloses a modulation method of a three-level space vector, a reference space vector is converted to a first sector; the reference space vector of the first sector is converted to an alpha-beta coordinate system; the number of a triangle located by the reference space vector is obtained by the reference space vector in the alpha-beta coordinate system; a basic space vector of the reference space vector is determined and synthesized according to the number of the triangle; the action time of the basic space vector is calculated; the calculated action time is mapped into the action time of the basic space vector of the original sector. The method of the invention converts the reference space vectors of various sectors to the first sector, sums up the mapping relationship between the action time of the first section and the action time of other sectors and can direct obtain the action time of the basic space vectors of other sectors according to the mapping relationship. The method of the invention can reduce the calculation steps, so the method is both applicable to the reference space vectors under a rectangular coordinate system and a polar coordinate system.

Description

technical field [0001] The invention relates to the technical field of electrical conversion, in particular to a three-level space vector modulation method and system. Background technique [0002] According to the basic principle of space vector modulation, any space vector can be synthesized from basic space vectors. In order to minimize the space vector output harmonics, it is necessary to synthesize the three basic space vectors that are closest to the reference space vector. [0003] The three-level inverter is one of the main ways to realize the speed regulation of large-capacity, medium and high-voltage motors. see figure 1 , the distribution diagram of the basic space vector of the three-level inverter. The three-level inverter has a total of 27 basic voltage vectors, and the entire voltage space vector distribution map can be divided into 6 sectors with a total of 24 triangular areas, and any space vector will be in one of the triangles. Obviously, the basic spa...

Claims

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Application Information

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IPC IPC(8): H02M7/42H02M7/48
CPCH02M7/487H02M2007/53876H02M7/53876
Inventor 丁荣军李江红陈华国许为
Owner ZHUZHOU CSR TIMES ELECTRIC CO LTD
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