Space vector pulse width modulation method for multi-level inverter

A multi-level inverter, pulse width modulation technology, applied in electrical components, AC power input into DC power output, output power conversion device and other directions, to reduce coordinate transformation, avoid the effect of trigonometric function calculation

Active Publication Date: 2014-11-05
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

[0005] The 60° coordinate system modulation method expresses the space vector and the basic vector in the 60° coordinate system, and then calculates the basic vector used for the equivalent space vector and the action time of the basic vector, and determines the three-phase voltage type multilevel inverter.

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  • Space vector pulse width modulation method for multi-level inverter
  • Space vector pulse width modulation method for multi-level inverter

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Embodiment Construction

[0019] The specific implementation of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is applicable to three-phase voltage inverters with three levels or above. It should be pointed out that, if there are symbols or processes in the following that are not specifically described in detail, those skilled in the art can refer to the prior art.

[0020] figure 1It is a circuit diagram of a mid-point clamped three-level inverter. The DC side is a DC voltage source with a DC voltage E. The voltage source is connected in parallel with two voltage-dividing capacitors, the first voltage-dividing capacitor C1 and the second voltage-dividing capacitor C2. The U phase of the midpoint clamped three-level inverter consists of the first clamping diode D1, the second clamping diode D2, the first switching tube S1, the second switching tube S2, the third switching tube S3, and the fourth switching tube The anode of...

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Abstract

The invention discloses a space vector pulse width modulation method for a multi-level inverter. According to the modulation method, a region which a space vector is located at a complex plane is judged through a given three-phase voltage, different coordinate systems are selected when the space vector is located at different regions on the complex plane, a basic vector for synthesis of the space vector and the action time of the basic vector are determined, and the basic vector is in correspondence to an output state of the three-phase voltage type multi-level inverter. Compared with the traditional modulation method, the modulation method has the advantages that the all switching states corresponding to a certain basic vector can be determined by simple operation, the action time of the basic vector is easy to calculate, a large number of trigonometric function and anti-trigonometric function operation is avoided, the operation of coordinate transformation is reduced, and digital implementation is promoted.

Description

technical field [0001] The invention relates to a three-level and above three-level voltage type multilevel inverter modulation method, in particular to a three-phase voltage type multilevel inverter space vector pulse width modulation method. Background technique [0002] Space voltage vector pulse width modulation regards the inverter and the motor as one, starting from the overall output effect of the three-phase voltage, the output voltage of the three-phase inverter is synthesized into a space voltage vector on the complex plane, and through different basic vector combinations To approach the specified space voltage vector, so that the output voltage waveform is as close as possible to the ideal sinusoidal waveform. [0003] At present, researchers at home and abroad have proposed different modulation methods for the basic principles of space vector pulse width modulation. The commonly used methods are (1) Cartesian coordinate system modulation method; (2) 60° coordinat...

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Application Information

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IPC IPC(8): H02M7/487
Inventor 康龙云冯自成
Owner SOUTH CHINA UNIV OF TECH
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