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Method for calculating action time of three vectors of three-level inverter

A technology of vector action time and action time, applied to electrical components, output power conversion devices, irreversible DC power input conversion to AC power output, etc., can solve problems such as complex calculation process and error-prone

Inactive Publication Date: 2015-07-15
SHANGHAI SURPASS SUN ELECTRIC CO LTD
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  • Application Information

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Problems solved by technology

[0018] However, the above-mentioned algorithm seems to be relatively easy to implement, but in the actual engineering application process, a large number of calculations for solving ternary linear equations are required, and the calculation process is too complicated and error-prone. Those skilled in the art unexpected

Method used

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  • Method for calculating action time of three vectors of three-level inverter
  • Method for calculating action time of three vectors of three-level inverter
  • Method for calculating action time of three vectors of three-level inverter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Embodiment 1, when the first voltage vector When it falls in the A1 small sector (a second sector) of the large sector (the first sector), the first voltage vector V in the A1 small sector ref The vector decomposition diagram after coordinate transformation, such as Figure 4 shown.

[0058] Coordinate transformation:

[0059] Method: Transform the coordinate system of the first voltage vector at this moment, specifically, the starting point of the first voltage vector is the origin, and the side (α-axis) of the initial sector extending from the starting point is taken as the horizontal axis, and a straight line (β-axis) perpendicular to the side is taken as the vertical axis to form an initial coordinate system. Connect the end point of the first voltage vector corresponding to the initial coordinate system to a vertex of the same second sector Taking the vertex as the origin and connecting the termination point to form a second voltage vector, and taking the ve...

Embodiment 2

[0085] Embodiment 2, when the first voltage vector When it falls in the small sector A2 of the large sector, the first voltage vector V in the small sector A2 red The vector decomposition diagram after coordinate transformation, such as Figure 5 shown.

[0086] Coordinate transformation: the method is the same as that in Embodiment 1, and will not be repeated here.

[0087] main, the first voltage vector Carry out coordinate transformation to get new coordinates: as the origin of coordinates, with as a coordinate axis, with The coordinate system composed of another coordinate axis is the reference coordinate system, and the second voltage vector at this moment is arrive connection

[0088] In the second voltage vector vertex, make two parallel lines, parallel to the coordinate axis and axes the new vector formed by the intersection of the two axes with is the second voltage vector Two decomposed vectors after coordinate transformation.

[0089] Thr...

Embodiment 3

[0110] Embodiment 3, when the first voltage vector When it falls in the small sector A3 of the large sector, the first voltage vector V in the small sector A3 ref The vector decomposition diagram after coordinate transformation, such as Image 6 shown.

[0111] Coordinate transformation: the method is the same as that in Embodiment 1, and will not be repeated here.

[0112] Carry out coordinate transformation on the first voltage vector to obtain new coordinates, with as the origin of coordinates, with as a coordinate axis, with The coordinate system composed of another coordinate axis is the reference coordinate system, and the second voltage vector at this moment is arrive connection

[0113] In the second voltage vector vertex, make two parallel lines parallel to the coordinate axis and axes the new vector formed by the intersection of the two axes with is the second voltage vector Two decomposed vectors after coordinate transformation.

[0114] ...

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Abstract

The invention relates to the technical field of circuit design, in particular to a method for calculating action time of three vectors of a three-level inverter. According to the method, the action time of the three vectors is calculated mainly based on the coordinate transformation and voltage-second balance principle, the calculation process is simple and flexible, calculation time is saved, calculation precision is improved, an algorithm is used for analyzing point balance speed in the three-level inverter, and the quite convenient effect can be achieved. At present, the technology is applied to a modular active power filter and is good in effect.

Description

technical field [0001] The invention relates to the technical field of circuit design, in particular to a method for calculating the action time of three vectors at three levels. Background technique [0002] In the past, the commonly used algorithm for calculating the action time of the three vectors of the three levels is: the method of solving the ternary linear equation system, among which, the algorithm implementation method of the ternary linear equation system mainly includes: [0003] Let the DC bus voltage of the main circuit be Udc, and the maximum space voltage vector be U, then U=(2 / 3)Udc, from the volt-second balance: [0004] V 1 → T 1 + V 7 → ′ T 7 ′ + V ...

Claims

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Application Information

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IPC IPC(8): H02M7/48
CPCH02M7/48H02M1/0006
Inventor 李成杰彭华良
Owner SHANGHAI SURPASS SUN ELECTRIC CO LTD
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