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Space vector pulse width modulation (SVPWM) method based on coordinates

A modulation method and coordinate technology, applied to control systems, control generators, vector control systems, etc., can solve problems such as heavy workload and complex algorithms, and achieve the effect of simplifying the modulation process and easy programming

Pending Publication Date: 2022-07-05
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
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  • Application Information

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Problems solved by technology

Compared with SPWM, this output method has higher utilization rate of DC power supply and smaller harmonics, but the algorithm is more complicated and the workload is larger when programming.

Method used

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  • Space vector pulse width modulation (SVPWM) method based on coordinates
  • Space vector pulse width modulation (SVPWM) method based on coordinates
  • Space vector pulse width modulation (SVPWM) method based on coordinates

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Embodiment Construction

[0032] like figure 1 As shown, the three-phase two-level inverter has a total of 3 bridge arms and 6 switch tubes, so a total of 2 3 = 8 states, corresponding to 8 basic voltage vectors (2 of which are zero vectors [111] T ,[000] T , 6 non-zero vectors [100] T ,[110] T [010] T ,[011] T [001] T ,[101] T ),like figure 2 shown;

[0033] The modulation process is as follows: first, according to the system structure such as PI / sliding mode controller, the target vector in the dq rotating coordinate system is calculated, and the target vector is divided by 2U dc / 3 Do per-unit processing, U dc is the power supply voltage, and then the target vector is expressed in coordinates as u dq =(u d ,u q );

[0034] Then according to the Park inverse transformation formula, the target vector is transformed into the αβ stationary coordinate system, and the coordinates are expressed as u αβ =(u α ,u β ), the inverse Park transformation formula is as follows:

[0035]

[00...

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Abstract

The invention discloses a coordinate-based SVPWM (Space Vector Pulse Width Modulation) method, which comprises the following steps of: (1) obtaining a target voltage vector in a dq rotating coordinate system according to a corresponding system structure, performing per unit processing, converting the target voltage vector to an alpha beta static coordinate system, and selecting two basic vectors according to a cost function; (2) the duty ratio is solved by using coordinates according to the geometrical relationship of the three; and (3) modulating and outputting an SVPWM signal according to the duty ratio and the basic vector state quantity. According to the method, a target vector is converted to a static coordinate system, a cost function is constructed, a basic vector required by synthesis of the target vector is selected through the cost function, and then a duty ratio required by synthesis is solved by converting a geometrical relationship of the vectors into an algebraic relationship between coordinates. And finally, the SVPWM signal is output by matching the on-off state corresponding to the basic vector with the duty ratio, so that the processes of sector judgment, vector decomposition, duty ratio sub-sector calculation and the like are omitted, the SVPWM modulation process is simplified, and the SVPWM modulation process is easier to realize in a programmed manner.

Description

technical field [0001] The invention relates to the technical field of PWM, in particular to a coordinate-based SVPWM modulation method. Background technique [0002] Space vector pulse width modulation technology (SVPWM) is one of the pulse width modulation technologies (PWM). The voltage vector makes the average of the output equal to the target quantity at the end of the cycle. The specific process of equivalent is: there are 6 non-zero vectors that can be output by the three-phase two-level inverter. These 6 basic vectors divide the space into 6 sectors, and the target vector at a certain time must be located in a certain In a sector, the equivalent output target vector can be combined with the two basic vectors and zero vector that constitute the sector. The action time of the two basic vectors and the zero vector is obtained through the process of vector decomposition and sector judgment, and then the action time is obtained. The time is applied twice in one cycle to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14H02P27/12H02M7/48
CPCH02P21/0003H02P21/14H02P27/12H02M7/48
Inventor 李有光谭秀菲
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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