Transforming method of random space vector PWM strategies

A technology of random space vector and conversion method is applied in the field of realizing mutual conversion between different random space vector PWM strategies. The effect of improving efficiency

Active Publication Date: 2015-10-21
HENAN POLYTECHNIC UNIV
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Problems solved by technology

[0007] Aiming at the problems that the randomization of random space vector PWM (SVPWM) technology causes the equivalent conversion relationship of different strategies to be complicated, and the concrete realization of a large number of randomization strategies is difficult, etc., the object of the present invention is to provide a random space vector PWM strategy conversion method to solve the above problems

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Embodiment Construction

[0037] The purpose of the present invention is to provide a random space vector PWM strategy conversion method to solve the problems of complex equivalent conversion relations of different strategies caused by randomization in the randomized SVPWM technology, difficulties in implementing a large number of randomized strategies, and the like.

[0038] A random space vector PWM strategy conversion method, in the process of realizing the random space vector PWM strategy conversion, when converting the PWM strategy ST1 whose randomization dimension is M1 to the PWM strategy ST2 whose randomization dimension is M2, the process is as follows figure 2 shown, including the following steps.

[0039] S1: Generate a random number matrix RS1 of the PWM strategy ST1, the number of rows and columns of the random number matrix RS1 are M1 and N1 respectively, and calculate the down-inversion of the PWM strategy ST1 according to the generated random number matrix RS1 The voltage pulse signal ...

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Abstract

The invention discloses a transforming method of random space vector PWM strategies. When a randomized PWM strategy ST1 is transformed into a randomized PWM strategy ST2, a random number matrix of the ST1 is generated, calculation is carried out to obtain a digital signal SIG1 of an output voltage of an inverter, and a spectral characteristic value of the SIG1 is calculated; all elements of a random number matrix RS2 of the ST2 are set as unknown variables, an expression of a digital signal SIG2 of the output voltage of the inverter is calculated, and then a mathematic expression of a spectral characteristic of the SIG2 is calculated; and then a target function of transformation from the ST1 to ST2 is constructed and optimization is carried out, thereby obtaining a numerical value of the RS2. According to the technical scheme, mutual transforming between different random SVPWM strategies can be realized and the complex strategy can be transformed into the simple one; application of the random SVPWM technology and development of the new strategy can be realized conveniently; and thus the method has the great practical value.

Description

technical field [0001] The invention belongs to the technical field of AC frequency conversion, and in particular relates to a method capable of realizing mutual conversion between different random space vector PWM strategies. Background technique [0002] Inverters can convert direct current into alternating current with variable frequency and amplitude, and are widely used in daily life and industrial and agricultural production. For example, in electric vehicles, the DC output from the battery is converted to AC to drive a three-phase AC motor. Due to the simple and reliable structure, such as figure 1 The two-level three-phase voltage source inverter shown is the most widely used. However, the commonly used space vector PWM (SVPWM) technology works according to the "volt-second balance" time-average equivalent principle. In addition to the sinusoidal fundamental wave voltage, the output voltage of the inverter also contains a large number of harmonics, causing Harmoni...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48
Inventor 陈国强康件丽孙付伟
Owner HENAN POLYTECHNIC UNIV
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