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Space vector modulation method of four-leg converter based on classification algorithm and apparatus thereof

A technology of space vector modulation and classification algorithm, which is applied to vector control systems, control electromechanical transmission devices, output power conversion devices, etc., can solve problems such as low calculation efficiency, multiple calculations, and affecting real-time control, and achieve high calculation efficiency , small amount of calculation, large theoretical innovation and the effect of application value

Inactive Publication Date: 2012-10-10
CHINA UNIV OF MINING & TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a space vector modulation method based on the classification algorithm four-leg converter, to solve the problem that the traditional three-dimensional voltage space vector modulation method needs more calculations, the calculation efficiency is low, and the real-time control is affected

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  • Space vector modulation method of four-leg converter based on classification algorithm and apparatus thereof
  • Space vector modulation method of four-leg converter based on classification algorithm and apparatus thereof
  • Space vector modulation method of four-leg converter based on classification algorithm and apparatus thereof

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Embodiment 1

[0037] Embodiment 1: the method is realized by the following technical solutions:

[0038] Step 1. From the three-phase reference voltage , , Six intermediate variables are calculated , by comparing the network to get the largest and second largest to determine the reference voltage space vector where the triangular prism;

[0039] Step 2: Carry out Clarke transformation on the input signal, from the reference voltage vector in the αβγ coordinate system The relationship with the five planes in the triangular prism determines the tetrahedron where it is located. The Clarke transformation is abbreviated as CLARK transformation;

[0040] Step 3. Definition , by combining the largest and second largest in step 1 Linear combination, computing three adjacent basic voltage space vectors , , action time , , ;

[0041] Step 4. According to the above results, switch the switching device of the converter so that the output voltage of the four-leg converter i...

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Abstract

A space vector modulation method of a four-leg converter based on a classification algorithm and an apparatus thereof belong to a four-leg converter vector modulation method. The method comprises the following steps: 1. Using three phase reference voltages vref1, vref2 and vref3 to calculate six intermediate variables nI, acquiring a maximum intermediate variable nI and a secondly maximum intermediate variable nI through a comparison network so as to determine a triangular prism where a reference voltage space vector Vref is located; 2. Carrying out clark transformation on an input signal and determining a located tetrahedron through a relation between the reference voltage space vector Vref and five planes in the triangular prism; 3. Defining n0 and calculating action time t1, t2, t3 of three adjacent basic voltage space vectors V1,V2 and V3 through linear combination with the maximum intermediate variable nI and a secondly maximum intermediate variable nI in the step 1; 4. According to above results, switching a switching device of the converter so that an output voltage of the four-leg converter is equivalent with a reference voltage. An algorithm realization process is simplified and comprises: calculating the intermediate variables; determining a maximum value and a secondly maximum value of the intermediate variables; carrying out the linear combination on the intermediate variables. The steps are intelligible. The realization is simple. Computation of the algorithm is small and real-time performance is strong.

Description

technical field [0001] The invention relates to a vector modulation method and device for a four-leg converter, in particular to a space vector modulation method and device for a four-leg converter based on a classification algorithm. Background technique [0002] The four-leg converter uses the fourth leg to control the neutral current, deal with unbalance and linear distortion problems. Voltage space vector modulation is a method widely used at present. The English abbreviation of voltage space vector modulation is SVPWM. From the perspective of the motor, it focuses on how to make the motor obtain a circular rotating magnetic field with constant amplitude, that is, sinusoidal flux. Since the SVPWM base vector of the four-leg converter is three-dimensional in space, it is also called three-dimensional voltage space vector modulation when applied to the four-leg SVPWM. The English abbreviation of three-dimensional voltage space vector modulation is 3D-SVPWM. [0003] SVPWM...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M5/458H02J3/01H02P21/00H02P21/14
CPCY02E40/40
Inventor 周娟伍小杰吴璇戴鹏于月森耿乙文张勇王子绩王超秦静
Owner CHINA UNIV OF MINING & TECH
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