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Distinguishing method of sectors of voltage vectors based on SVPWM (Space Vector Pulse Width Modulation) algorithm

A technology of voltage vector and discriminant method, which is applied to electrical components, output power conversion devices, irreversible AC power input conversion to DC power output, etc., to achieve the effect of easy implementation and simple algorithm

Inactive Publication Date: 2015-01-28
泰州学院
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  • Abstract
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Problems solved by technology

[0003] The present invention provides a voltage vector sector discrimination method of SVPWM algorithm, which can solve the voltage Discrimination problem of vector sectors

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  • Distinguishing method of sectors of voltage vectors based on SVPWM (Space Vector Pulse Width Modulation) algorithm
  • Distinguishing method of sectors of voltage vectors based on SVPWM (Space Vector Pulse Width Modulation) algorithm

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Embodiment Construction

[0017] exist figure 1 In, SVPWM algorithm, 6 basic voltage vector V 1 , V 2 , V 3 , V 4 , V 5 , V 6 Divide the 360-degree voltage space into 60-degree sectors on average, a total of six sectors. When a certain voltage vector is to be synthesized U x When , first find the sector where the vector is located, and then use the two basic vectors on both sides of the sector and combine the zero vector to synthesize according to different time ratios U x , the present invention will figure 1 The voltage vector sectorization shown is described in terms of voltage vector phase sine and cosine.

[0018] The invention provides a kind of voltage vector sector discrimination method of SVPWM algorithm, and it comprises the following steps:

[0019] Step 1, in the SVPWM algorithm, the three-phase voltage u a , u b , u c Transform from the three-phase abc coordinate system to the two-phase αβ coordinate system, so that the voltage values ​​on the α and β axes can be...

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Abstract

The invention discloses a distinguishing method of sectors of voltage vectors based on an SVPWM (Space Vector Pulse Width Modulation) algorithm. The method comprises the steps of 1, converting three-phase voltage ua, ub and uc from a three-phase a, b and c coordinate system into a two-phase alpha and beta coordinate system in the SVPWM algorithm to obtain voltage values u alpha and u beta on an alpha axis and a beta axis to obtain voltage phase information as shown in the specification, 2, obtaining phase information of the voltage vectors, dividing the sectors of the voltage vectors, presenting the sectors in a voltage vector phase sine value and a voltage vector phase cosine value, and calculating a phase value sin theta expressed by voltage vector sine and a phase value cos theta expressed by voltage vector cosine: setting an equation as shown in the specification according to the voltage values u alpha and u beta obtained in Step 1 to obtain the phase value sin theta expressed by the voltage vector sine to be u alpha / m and the phase value cos theta expressed by the voltage vector cosine to be u beta / m, and 3, determining the corresponding sectors of the voltage vectors by consulting a voltage vector sector dividing table according to calculated sin theta and cos theta in Step 2.

Description

technical field [0001] The invention relates to a voltage vector sector discrimination method of an SVPWM algorithm. Background technique [0002] In the PWM pulse modulation strategy of the PWM rectifier, the SVPWM control method is widely used due to its characteristics of small output waveform distortion rate, high utilization rate of DC side voltage, fast response speed and easy digital realization. SVPWM is a control method that rotates the composite vector of the three-phase voltage along a predetermined trajectory. In the SVPWM algorithm, there are 8 voltage vectors, two of which are zero vectors, and the other 6 effective basic vectors divide the 360-degree voltage space into 60-degree sectors, a total of six sectors, using these 6 basic effective vector and 2 zero vectors, any vector within 360 degrees can be synthesized. When a certain vector is to be synthesized, it is first necessary to find the sector where the vector is located, and then use the two basic vec...

Claims

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Application Information

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IPC IPC(8): H02M7/217
CPCH02M7/02
Inventor 许胜
Owner 泰州学院
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