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Two-level dual-mode space vector over-modulation method and system

A technology of space vector and overmodulation, which is applied in the field of space vector pulse width modulation and its system, and can solve the problems of large difference between output voltage and reference voltage, complex calculation, etc.

Active Publication Date: 2012-08-01
ZHUZHOU CSR TIMES ELECTRIC CO LTD
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Problems solved by technology

[0013] The purpose of the present invention is to provide a two-level dual-mode space vector over-modulation method and its system, which overcomes the technical problems of the existing over-modulation method and its system, which are complex in calculation and have a large difference between the output voltage and the reference voltage. The realization principle and process are simple, and the output voltage and reference voltage can be kept highly consistent

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[0091] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0092] as attached figure 2 to attach Figure 17 As shown in , a specific embodiment of a two-level dual-mode space vector overmodulation method and its system of the present invention is given, and the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0093] In order to describe accurately, first define the modulation ratio M of the SVPWM reference vector:

[0094] ...

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Abstract

The invention discloses a two-level dual-mode space vector over-modulation method and a two-level dual-mode space vector over-modulation system. The over-modulation method comprises the following steps of: calculating a modulation ratio of a reference vector and an acting time of a basic vector according to a method of a linear modulation zone; determining an over-modulation zone in which the reference vector stays according to the modulation ratio to select different over-modulation modes; calculating a compensation coefficient of an over-modulation mode A if the reference vector stays at the over-modulation mode A, and correcting the acting time of the basic vector according to the acting time and the compensation coefficient of a zero vector; and calculating a compensation coefficient of an over-modulation mode B if the reference vector stays at the over-modulation mode B, and correcting an acting time of the basic vector according to the acting time and the compensation coefficient of two valid vectors. Due to the adoption of the over-modulation method and the over-modulation system, technical problems that the existing over-modulation method and over-modulation system are complicated, and difference between the output voltage and the reference voltage is large can be solved, the method and the system are simple in principle and simple to realize, and the heights of the output voltage and the reference voltage are maintained to be consistent.

Description

technical field [0001] The invention relates to a space vector pulse width modulation method and system thereof, in particular to a simple overmodulation method and system thereof for two-level space vector pulse width modulation mainly used in AC drive control systems. Background technique [0002] Pulse Width Modulation (PWM, Pulse Width Modulation) technology is a modern electrical system voltage output control method. Its principle is mainly based on the fact that when narrow pulses with equal impulse but different shapes are added to the link with inertia, the effect is basically the same, which is the principle of area equivalence. Pulse width modulation is a technology that uses this principle to modulate the width of the pulse, that is, by modulating the width of a series of pulses, the required waveform (including amplitude and phase) is equivalently obtained. Pulse Width Modulation is used in the field of AC drives. Its main function is to modulate PWM waves accor...

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Application Information

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IPC IPC(8): H02P21/00H02P27/12
Inventor 刘可安甘韦韦冯江华尚敬杨大成梅文庆
Owner ZHUZHOU CSR TIMES ELECTRIC CO LTD
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