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Modulation method and device for reducing ultra-high harmonic amplitude at switching frequency of converter

A technology of converter switching and switching frequency, which is applied in the output power conversion device, the conversion of AC power input to DC power output, electrical components, etc., can solve the problem of insufficient reduction in the amplitude of ultra-high harmonics.

Inactive Publication Date: 2020-03-27
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +1
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  • Description
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Problems solved by technology

Based on this, there are currently two random switching frequency PWM modulation technologies: one is hybrid random switching frequency modulation technology, which reduces the requirements for random number performance, but if the sampling rate is too high, the amplitude of ultra-high harmonics at the switching frequency The reduction is not obvious enough; the other is to add Markov chain random switching frequency modulation technology based on Markov chain in the random switching frequency. This method is more effective for the larger the state space, and the modulation process has only two states, so it brings certain limitations

Method used

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  • Modulation method and device for reducing ultra-high harmonic amplitude at switching frequency of converter
  • Modulation method and device for reducing ultra-high harmonic amplitude at switching frequency of converter
  • Modulation method and device for reducing ultra-high harmonic amplitude at switching frequency of converter

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Embodiment

[0076] This embodiment provides a modulation method for reducing the amplitude of ultra-high harmonics at the switching frequency of the converter, such as Figure 4 shown, including the following steps:

[0077] S1: Generate a set of pseudo-random sequences with uniform distribution and low correlation; the pseudo-random sequence not only has a small correlation with random signals, but also has the regularity that random signals do not have, and the generation speed is fast.

[0078] The generation method of the pseudo-random sequence is:

[0079] Step S11: Set the initial value x of the quantum logistic chaotic system 0 、y 0 ,z 0 , and system control parameters r and β;

[0080] Step S12: The initial value x in step S11 0 、y 0 ,z 0 , and the system control parameters r and β are substituted into the quantum chaotic system, such as the initial value x 0 =0.3,y 0 =0.06,z 0 =0.2, and system control parameter r=3.99, β=6.2;

[0081] middle,

[0082] get x i 、y i ,...

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Abstract

The invention relates to a modulation method and device for reducing the ultra-high-order harmonic amplitude at the switching frequency of a converter. The modulation method comprises the steps: generating a pseudo-random sequence; calculating the upper limit frequency and the lower limit frequency of the random switching frequency PWM; and generating a carrier signal and a modulation signal, andcarrying out random switching frequency PWM modulation. The random switching frequency PWM modulation can effectively reduce the amplitude of ultra-high-order harmonics at the switching frequency of the converter, and enables the ultra-high-order harmonics to be uniformly distributed in a wider frequency range, thereby inhibiting the conducted electromagnetic interference in a switching circuit, and improving the electromagnetic compatibility of a system.

Description

technical field [0001] The application belongs to the technical field of power quality assessment, and in particular relates to a modulation method and device for reducing the amplitude of ultra-high harmonics at the switching frequency of a converter. Background technique [0002] With the continuous development of power electronic power semiconductor devices, the performance requirements of power electronic devices are increasing day by day, prompting the emergence of various converters with pulse width modulation (PWM-Pulse Width Modulation) control technology. PWM modulation technology has been widely used in inverter, rectifier, chopping and frequency conversion, occupies a very important position in power electronics technology, and has laid a solid foundation for the rapid development of power electronics technology. At present, most of the converters use PWM modulation with fixed switching frequency. This fixed switching frequency PWM technology has a good suppressio...

Claims

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Application Information

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IPC IPC(8): H02M7/5387H02M7/5395
CPCH02M7/5387H02M7/5395
Inventor 郑晨刘书铭李琼林代双寅唐钰政张博王毅丁一博
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST
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