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Carrier Phase Shift Pulse Width Modulation Method

A technology of pulse width modulation and carrier phase shifting, applied in the field of carrier phase shifting pulse width modulation, to achieve the effects of no complicated calculation, easy implementation, and wide application range

Active Publication Date: 2015-08-19
国电南瑞吉电新能源(南京)有限公司
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  • Abstract
  • Description
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Problems solved by technology

[0004] Regarding the even-order harmonic suppression of AC PWM, the currently available technologies are based on a method proposed by Dr. Bin Wu (Canada). For details, please refer to "High-Power Converters and AC Drives" (New Jersey: IEEE Press, Wiley -Interscience, 2006. WU Bin), but this method is only applicable to SVPWM
At present, there is no general solution to such problems

Method used

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Embodiment Construction

[0017] The technical scheme of the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.

[0018] Such as figure 1 As shown, using the traditional PWM method, the corresponding comparison values ​​at A and B are complementary, and compared with the triangular carrier to generate a PWM waveform, A time corresponds to the width of the positive pulse in the triangular carrier cycle and time B corresponds to the width of the negative pulse in the triangular carrier cycle are equal, but the two PWM waveforms are not completely symmetrical. According to the principle of mathematical Fourier decomposition, the PWM waveform contains even harmonic components.

[0019] The carrier phase-shifting pulse width modulation method of the present invent...

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Abstract

The invention discloses a carrier phase-shifting pulse width modulation method. The carrier phase-shifting pulse width modulation method is used for adjusting the phase of a triangular carrier. In the operation process of PWM, the computational process, a computational method and the comparison logic are not changed on the basis of traditional PWM, phase changes are periodically carried out on the triangular carrier, a controller carries out phase shifting with the odd number times of 180 degrees on the phase of triangular carrier at intervals of a half of a fundamental wave period or one of odd-number parts of a half of the fundamental wave period, and even harmonic in a PWM waveform can be eliminated theoretically. The carrier phase-shifting pulse width modulation method is wide in range of application, free of complex computation, easy to implement, suitable for both single-phase application and multi-phase application, suitable for PWM communication modes such as SPWM and SVPWM, and applicable to engineering popularization.

Description

technical field [0001] The invention relates to a carrier wave phase-shifting pulse width modulation method, which is suitable for various types of AC output pulse width modulation techniques and can greatly reduce even harmonics in pulse width modulation results. Background technique [0002] With the rapid development of power semiconductor devices, especially the IGBT, the application of power electronic devices is becoming more and more extensive, especially in the occasion of AC-DC conversion. In the AC system, both the power grid and the motor need to try their best to avoid the harm caused by harmonics. In principle, reducing or eliminating harmonics is an effective technical way to solve the problem of harmonic pollution. In the current AC-DC conversion device, the fully-controlled power semiconductor device usually works in the switching mode, and the PWM (pulse width modulation, pulse width modulation for short) method is the most common method. The basic principl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/48
Inventor 赵紫龙邵宜祥过亮瞿兴鸿
Owner 国电南瑞吉电新能源(南京)有限公司
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