Method and device for compensating ripple amplitude modulation

A technology of amplitude modulation and compensation method, which is applied in the field of pulse width modulation distortion and compensation of ripple amplitude modulation, to achieve the effects of reducing output current distortion, reducing output current oscillation, and improving output drive performance

Inactive Publication Date: 2002-11-13
EMERSON NETWORK POWER CO LTD
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Problems solved by technology

[0018] The technical problem to be solved by the present invention is how to compensate the distortion caused by the pulse width modulation of the DC bus voltage ripple, specifically, in the process of pulse width modulation, a method that can aim at the DC bus ripple and reduce the DC bus voltage as much as possible is proposed. Modulation Compensation Method and Device for Influence of Ripple Amplitude Modulation Effect on PWM Output in Frequency Converter

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  • Method and device for compensating ripple amplitude modulation
  • Method and device for compensating ripple amplitude modulation

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Embodiment Construction

[0051] Aiming at the DC bus voltage change, the present invention introduces the DC bus variation CVD into the pulse width modulation algorithm formula, that is, expresses the modulation ratio M as a function of the real-time sampled DC bus voltage CVD during the current carrier period, and requires the DC bus voltage The sampling rate is greater than 20 times the frequency of the sampled signal, and the sampling frequency of the actual system should be greater than 3000Hz to ensure that the CVD signal formed by sampling can reflect the fluctuation of the DC bus ripple. Accordingly, the above formulas (1), (2), and (3) can be rewritten as the following real-time PWM algorithm formula including bus voltage variation compensation factor: Sine PWM real-time PWM algorithm formula

[0052] t=T * SIN(a) * Um / CVD

[0053] =T * SIN(a) * [Um / Us] * Us / CVD

[0054] =T * SIN(a) * m * Us / CVD

[0055] =T * m * SIN(a) * Us / CVD (4)

[0056] in:

[0057] t: modulation puls...

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Abstract

A ripple wave amplitude modulating compensation method is first to real-time sample the DC bus voltage transient value CVD with ripple signals; according to the sampled CVD and the rated DC bus voltage value US, calculate the correction coefficient K=Us / CVD which multiplies the operation factor of pulse-width modulation before pulse-width modulation calculation to make correction compensation, ormultiply the gained pulse-width value after pulse-width modulation operation to make correction compensation; therefore to real-time sample the bus ripple wave in each carrier period to real-time correct pulse-width modulation so as to solve the problems of sine pulse-width modulation or spacing vector-width modulation distortion resulted from ripple wave amplitude modulation to lower the output current, increase output driving performance of frequency converter.

Description

technical field [0001] The present invention relates to power control technology, more particularly, to a method and device for correcting pulse width modulation distortion caused by amplitude modulation of inverter output PWM pulses due to ripple of DC bus voltage in power electronic equipment , and more particularly, to a method and apparatus for compensating for ripple amplitude modulation. Background technique [0002] In the inverter controlled by V / F, sinusoidal pulse width modulation or space vector pulse width modulation is used to realize three-phase voltage and current output, and the influence of DC bus voltage ripple is ignored. For sinusoidal pulse width modulation, any carrier The formula of the pulse width modulation algorithm in the period is: [0003] t=T * m * SIN(a) (1) where: [0004] t: modulation pulse width time; [0005] T: carrier period; [0006] M: modulation ratio [0007] (a): The angle of the current carrier [0008] For space ve...

Claims

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Application Information

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IPC IPC(8): H02M7/00
Inventor 黄金亮
Owner EMERSON NETWORK POWER CO LTD
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