Complete-period selective harmonic elimination pulse width modulation method without waveform symmetry characteristics

A technology of waveform symmetry and harmonic elimination, applied in the field of inverters, can solve the problem that the control of even harmonic amplitude and phase angle of each harmonic cannot be realized, and the control of even harmonic amplitude and phase angle cannot be realized. Problems such as limiting the applicable space of the solution

Inactive Publication Date: 2016-12-14
JILIN UNIV
View PDF5 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Theoretically, the inverter output waveform analyzed by the SHEPWM method can be arbitrary, but in practice, in order to control the harmonics and simplify the equations, it is usually assumed that the inverter phase voltage output waveform has a 1/4 cycle symmetry, which A limited condition simplifies the establishment method and solution process of nonlinear equations, but at the same time it also limits the applicable space of the solu

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Complete-period selective harmonic elimination pulse width modulation method without waveform symmetry characteristics
  • Complete-period selective harmonic elimination pulse width modulation method without waveform symmetry characteristics
  • Complete-period selective harmonic elimination pulse width modulation method without waveform symmetry characteristics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0054] The present invention will be further described in detail below in conjunction with the drawings, specific implementations and a specific embodiment.

[0055] Such as figure 1 The hardware system structure of the specific embodiment includes: input DC voltage Ei, main control module, drive circuit, single full bridge circuit, load five parts, wherein the main control module calculates and generates four SHEPWM control pulses; the drive circuit is used to generate four Drive signal; a single full bridge circuit is composed of four IGBT power devices, VT1, VT2, VT3, and VT4, which are used to convert DC voltage to AC voltage. The emitter of VT1 is connected to the collector of VT2, and the emitter of VT2 is connected to the VT4. The emitter is connected, the collector of VT4 is connected with the emitter of VT3, and the collector of VT3 is connected with the collector of VT1.

[0056] Such as figure 1 The connection mode of the schematic diagram of the hardware system structur...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a complete-period selective harmonic elimination pulse width modulation method without waveform symmetry characteristics. The method includes the following steps: generating an ideal inverter output waveform, carrying out Fourier analysis on the ideal inverter output waveform, and determining a DC component and a Fourier coefficient of the ideal waveform; making fundamental waves of a bipolarity SHEPWM wave and the ideal inverter output waveform be equal to the Fourier coefficients and the DC components of controlled harmonics to obtain a nonlinear equation set, and carrying out solution by using the nonlinear equation set to obtain a group of switch angles; and controlling the on-off of an inverter power device by the obtained switch angles so as to realize accurate control of the DC component and the fundamental wave of an inverter output signal, and the amplitudes and the phases of the controlled harmonics. According to the method provided by the invention, the 1/2 period or 1/4 period cycle symmetry constraints of the inverter voltage output waveform, the DC component and the fundamental wave of the inverter output waveform and the amplitudes and the phases of the controlled harmonics are accurately controlled to obtain waveforms meeting the requirements of output components.

Description

Technical field [0001] The invention belongs to the technical field of inverters for power electronic equipment, and specifically relates to a selective harmonic elimination pulse width modulation (Selective Harmonic Eliminated Pulse Width Modulation, SHEPWM) method with a full cycle without waveform symmetry. Background technique [0002] With the development of power electronic technology, inverters have been widely used in various power electronic devices. The PWM control method is a key technology in inverter research, which directly determines whether the power conversion goal can be achieved, and has a direct and important impact on the output voltage, current waveform quality, reduction of system switching losses, and improvement of system efficiency. . [0003] With the rapid development of power electronics technology today, various PWM control strategies applied to inverters continue to emerge. In summary, they can be divided into three main categories: (1) Carrier Pulse...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H02M1/12H02M7/5395
CPCH02M1/12H02M7/5395H02M1/0054Y02B70/10
Inventor 于生宝陈楠高丽辉黄勇陈仁辉韩月
Owner JILIN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap