Software phase-locked loop realization method based on average filtering algorithm

A technology of software phase-locked loop and filtering algorithm, which is applied in the field of signal processing to achieve the effect of improving the overall response speed, tracking accuracy and dynamic response speed

Inactive Publication Date: 2012-07-25
NANJING APAITEK TECH
View PDF2 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the two-order IIR filter used in this paper will have a certain delay relatively speaking.

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
  • Software phase-locked loop realization method based on average filtering algorithm
  • Software phase-locked loop realization method based on average filtering algorithm
  • Software phase-locked loop realization method based on average filtering algorithm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] The software phase-locked loop realization method based on average value filter algorithm of the present invention, it comprises the following steps:

[0023] 1) For a three-phase symmetrical 380V power grid, the three-phase phase voltages are respectively u a , u b , u c , where u a =311*sin ωt,u b =311*sin(ωt-120°), u c =311*sin(ωt+120°), first rotate the DQ coordinate transformation of the three-phase grid voltage, and extract its active and reactive components according to the three-phase coordinate transformation, specifically: for the three-phase grid voltage u a , u b , u c Perform DQ coordinate transformation, D axis component

[0024] u d = 2 / 3 [ u a * sin ωt + u b * ( - 1 ...

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 software phase-locked loop realization method based on an average filtering algorithm. The method increases the response speed and realizes remarkably short dynamic response time. The software phase-locked loop realization method based on an average filtering algorithm, disclosed by the invention, comprises the following steps of: 1) firstly performing rotary DQ coordinate transformation on the voltage of a three-phase power grid, and extracting the active and inactive components according to the three-phase coordinate transformation; 2) performing average filtration on the Q-axis signal, and averaging the Q-axis in the T/6 interval to obtain the corresponding DC (direct current) flow; 3) outputting the filtered signal by an incremental PI regulator to obtain the required power-grid synchronous angle; and 4) programming by a 32-bit DSP (digital signal processor) to realize software phase lock.

Description

technical field [0001] The invention relates to a method for realizing a software phase-locked loop, in particular to a method for realizing a software phase-locked loop based on an average value filtering algorithm, and belongs to the technical field of signal processing. Background technique [0002] In recent years, power electronic devices have been widely used in power systems, various industrial sectors and household appliances. Therefore, obtaining the phase angle of the three-phase grid voltage accurately and quickly is a precondition to ensure that the whole system has good steady-state and dynamic performance. The general way to obtain the grid voltage phase angle is to first generate a signal synchronous with the grid voltage, and then obtain the phase angle through the synchronous signal. If the phase-locked loop design is not good, it will lead to the distortion of the output voltage and current of the system, and even affect the stability of the system. There...

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
Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 张东张明花跃学
Owner NANJING APAITEK 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