Combined local frequency multiplication sampling algorithm for generating SPWM waves

A sampling algorithm and combined technology, applied to controllers with pulse train output signals, electric controllers, etc., can solve the problems of inaccurate measurement of electrical measuring instruments, increase load loss, and affect power monitoring, etc., to reduce A/ D sampling work, improve real-time performance, fast operation effect

Inactive Publication Date: 2015-01-21
SUZHOU UNIV OF SCI & TECH
View PDF4 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] (1) For rotary motors, harmonics will cause torque ripple, increase power consumption (copper loss and iron loss) to cause heat generation, and may even cause vibration or resonance
In addition, harmonics will cause electromagnetic noise in motors or inverters, polluting the environment
[0004] (2) For capacitive loads, some harmonics will also make it resonate, and the harmonic current will increase, resulting in damage to the capacitor due to overload or overvoltage
[0005] (3) For the transformer, increasing its load loss, especially when resonance occurs, the harmonics will also be amplified by the transformer, which will greatly increase its loss, and even cause serious power accidents
[0006] (4) For the power system, it

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
  • Combined local frequency multiplication sampling algorithm for generating SPWM waves
  • Combined local frequency multiplication sampling algorithm for generating SPWM waves
  • Combined local frequency multiplication sampling algorithm for generating SPWM waves

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0035] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0036] refer to figure 1 and Figure 5 As shown, a combined local multiplication sampling algorithm for generating SPWM waves:

[0037] Set the modulation wave frequency by external circuit input , Modulation , carrier ratio , virtual octave interval coefficient , virtual multiplier and dead time and other parameters, start the circuit, introduce the motor stator current feedback signal, sample the feedback signal at the peak and valley moments of the triangular carrier wave, and save the value of the sampling point cumulatively (assuming the system is stable, the stator current waveform is close to a sine wave, so the sampling value can be tentatively written as ), sampling only in the positive half cycle of each modulation wave cycle;

[0038] refer to figure 2 As shown, at the zero moment of the sinusoidal modula...

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 discloses a combined local frequency multiplication sampling algorithm for generating SPWM waves. A symmetrical region is obtained with the zero point of a sine curve as the midpoint, and virtual sampling points are constructed in the region according to a linear combination mode in mathematics so that the effect of frequency multiplication can be achieved; under the situation that the number of the actual sampling points is definite, harmonic energy will gradually move in the direction of a high frequency along with the increase of the width of the region of frequency multiplication or the increase of number of frequency multiplication, and thus the energy of low-order harmonic components is reduced. According to the combined local frequency multiplication sampling algorithm for generating the SPWM waves, harmonic energy is transferred to a high-order harmonic region, the low-order harmonic components can be filtered out easily, and control signals more close to sine waves can be obtained; the algorithm is simple and easy to realize in a programming mode, and is mainly applied to rectifiers and inverters.

Description

technical field [0001] The invention belongs to the field of power electronics, and in particular relates to a combined local frequency multiplication sampling algorithm for generating SPWM waves, which is mainly used in servo motor control, inverter power supply, frequency converter, rectifier and the like. Background technique [0002] With the rapid development of microprocessor technology, computer technology, power electronics technology, automatic control theory and other related disciplines, inverters using pulse width modulation (PulseWidth Modulation, PWM) technology have become the most basic in contemporary power electronics technology. One of the devices. Since the emergence of PWM technology, PWM technology has been widely used in the fields of servo motor control, UPS, rectifiers and frequency converters due to its flexible frequency modulation and voltage regulation methods and excellent performance. So far, almost all the variable frequency speed regulators...

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): G05B11/28
Inventor 刘红俐陈健亨朱其新
Owner SUZHOU UNIV OF SCI & TECH
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