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Fast three-phase space vector modulation method based on three-dimensional coordinate system

A technology of vector modulation and coordinate system, applied in the direction of output power conversion device, high-efficiency power electronic conversion, electrical components, etc., can solve the problems that multiplication, division and trigonometric function operation cannot be completely canceled, and it is not easy to expand, so as to achieve strong scalability , optimize harmonic performance, and ensure the effect of voltage

Active Publication Date: 2019-01-04
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

[0004] Aiming at the inadequacies of the above-mentioned existing SVPWM algorithm that is not easy to expand and cannot completely cancel the multiplication and division and trigonometric function operations, the present invention provides a fast three-phase space vector modulation method based on a three-dimensional coordinate system, which is suitable for three-phase multiple The level converter, the present invention has both the advantages of all the traditional fast SVPWM algorithms and realizes that there is no multiplication, division and trigonometric function operation in the whole modulation process under the three-dimensional coordinate system, and the arbitrary level of the converter is realized by simple addition and subtraction. In addition, the method of the present invention also provides some controllable factors, which can realize the optimization of switching action sequence of various three-phase multilevel converters, reduce switching loss and harmonic output; can eliminate common mode voltage, Output smoother flux linkage and ensure voltage balance within phase and voltage balance between phases

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  • Fast three-phase space vector modulation method based on three-dimensional coordinate system
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  • Fast three-phase space vector modulation method based on three-dimensional coordinate system

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[0039] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0040] The fast three-phase space vector modulation method proposed by the present invention is applicable to various converters such as three-phase diode clamped multilevel, cascaded multilevel and modularized multilevel, and the three-phase Simple coordinate transformation of the voltage makes all vectors appear in the three-dimensional coordinate system established by the present invention, so that the method proposed by the present invention has the advantages of both three-dimensional space vector modulation and two-dimensional space vector modulation. In the three-dimensional coordinate system, the method proposed by the invention can easily realize the phase voltage and the line voltage of any level. In addition, the method proposed by the invention also provides several controllable factors to further improve the multi-faceted performa...

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Abstract

A fast three-phase space vector modulation method based on a three-dimensional coordinate system belongs to the technical field of power electronics. At first, that vector is map from a two-dimensional coordinate system to a three-dimensional coordinate system by using a simple coordinate change, three modulation vectors are used to synthesize the reference voltage vector, Three modulation vectorsform a modulation triangle in the three-dimensional coordinate system, detect the closest modulation vector to the origin in the modulation triangle, calculate the three-phase switching state corresponding to the vector and map it to the three-dimensional coordinate system, and scale the reference voltage vector to simplify the multilevel vector space to the two-level vector space; Finally, the duty cycle of the three-phase switching state is calculated and compared with the triangular carrier of the converter to generate the switching driving signal. The invention can realize arbitrary leveloutput only through simple addition and subtraction operation, and has extremely strong expansibility; In addition, the present invention provides several controllable factors to improve the performance of various aspects of multilevel converters.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and relates to a modulation algorithm of a three-phase multilevel converter, especially in the application of modulation algorithms using digital chips such as FPGA and DSP as control chips. Background technique [0002] Space Vector Modulation (SVPWM) is a pulse width modulation method based on the concept of space voltage vector synthesis, which has been widely used in power electronic modulation. Its core idea is to use the different switching states of the converter as the basic action vectors, and synthesize the reference vectors according to the selected basic vectors and their specific action time. Compared with the ordinary PWM modulation algorithm, it has many outstanding advantages: high utilization rate of voltage, easy digital realization, good output waveform quality, close to sinusoidal, reasonable arrangement of space vector, can reduce switching frequency, reduce switchi...

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Application Information

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IPC IPC(8): H02M7/483H02M1/12
CPCH02M1/12H02M7/483H02M1/0048H02M1/123Y02B70/10
Inventor 舒泽亮林宏健朱磊磊闫晗姚家煊钱奕何晓琼
Owner SOUTHWEST JIAOTONG UNIV
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