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A svpwm synchronous overmodulation method

A technology of overmodulation and modulation ratio, which is applied in the field of SVPWM synchronous overmodulation, can solve problems such as inability to reach square waves, and achieve stable and efficient operation capabilities, good voltage harmonic performance, and simple modulation range

Active Publication Date: 2019-12-17
BEIJING JIAOTONG UNIV
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Problems solved by technology

Modern asynchronous modulation usually uses SVPWM modulation, however, SVPWM modulation is limited by the linear region and cannot reach square waves

Method used

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  • A svpwm synchronous overmodulation method
  • A svpwm synchronous overmodulation method
  • A svpwm synchronous overmodulation method

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Embodiment Construction

[0042] In order to illustrate the present invention more clearly, the present invention will be further described below in conjunction with preferred embodiments and accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive, and should not limit the protection scope of the present invention.

[0043] Such as Figure 1 to Figure 4 As shown, the present invention discloses a specific embodiment of a SVPWM synchronous overmodulation method. In this embodiment, taking the rail transit traction system as an example, the method includes:

[0044] S1: Determine the voltage vector in the motor vector control system, and calculate the modulation ratio and angle of the voltage vector. In this embodiment, a plurality of voltage vectors in the motor vector control system are determined, the vector starting points of the mu...

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Abstract

The invention discloses an SVPWM synchronous over-modulation method. The method comprises: a to-be-modulated voltage vector is determined and a modulation ratio and an angle of the voltage vector arecalculated; according to the modulation ratio of the voltage vector, pre modulation of the voltage vector entering an over-modulation region is carried out; acting time of the voltage vector after premodulation is calculated; and the acting force of the voltage vector is compared with a carrier cycle to obtain an acting sequence of the voltage vector. According to the invention, transition from asynchronous SVPWM modulation to square wave modulation is realized. The SVPWM synchronous over-modulation method is suitable for the application fields like the low switching frequency.

Description

technical field [0001] The invention relates to the technical field of SVPWM modulation. More specifically, it relates to a SVPWM synchronous overmodulation method. Background technique [0002] Traditionally, the method of voltage signal from asynchronous modulation to square wave modulation is asynchronous SPWM-synchronous SPWM-square wave. SPWM modulation is lower than SVPWM in terms of harmonic performance and voltage utilization. Modern asynchronous modulation usually adopts SVPWM modulation, however, SVPWM modulation is limited by the linear region and cannot reach square waves. [0003] Therefore, it is necessary to provide a new SVPWM modulation method to be able to modulate to a square wave mode. Contents of the invention [0004] An object of the present invention is to provide a SVPWM synchronous overmodulation method to realize the transition from asynchronous SVPWM modulation to square wave modulation. [0005] To achieve the above object, the present inven...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P27/12
CPCH02P27/12
Inventor 陈杰刘志刚邱瑞昌唐敬李庭
Owner BEIJING JIAOTONG UNIV
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