Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A method for implementing software phase-locked loop under unbalanced conditions

A software phase-locked loop and implementation method technology, applied in the direction of electrical components, automatic power control, AC network circuits, etc., can solve the problem of losing the fundamental component of the locked power grid, and achieve the effect of stable and reliable functions

Active Publication Date: 2017-02-22
SHANGHAI UNIVERSITY OF ELECTRIC POWER
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of unbalanced three-phase power grid, due to the existence of negative sequence components and harmonic components, the conventional software phase-locked loop (Software Phase Locked Loop, SPLL) loses the ability to lock the fundamental component of the power grid

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
  • A method for implementing software phase-locked loop under unbalanced conditions
  • A method for implementing software phase-locked loop under unbalanced conditions
  • A method for implementing software phase-locked loop under unbalanced conditions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0044] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0045] Such as Figure 5 As shown, a software phase-locked loop implementation method for unbalanced conditions includes the following steps:

[0046] Step S1: Transform the abc component U on the three-phase stationary coordinate system through 3s / 2s transformation a , U b , U c Transformed into the αβ component U on the two-phase stationary coordinate system α , U β , that is, via T αβ Implement the Clark transform,

[0047]

[0048] Step S2: The αβ component U obtained in step S1 α , U β Input to the separator composed of biquad generalized integrator, filter all the ...

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 software phase-locked loop implementation method under the unbalanced condition. The software phase-locked loop implementation method comprises step 1, performing 3s / 2s transformation; step 2, inputting a transformation result to a separator which is formed by double second-order generalized integrators and filtering all of high-order harmonic waves and part of low-order harmonic waves; step 2, inputting a filtering result to positive and negative sequence cascaded DSC (Delayed Single Cancelation) and filtering the rest of the low-order harmonic waves; step 4, separating out a positive and negative sequence component of a three-phase static coordinate system through 2s / 3s transformation; step 5, obtaining a q axis positive sequence component through dq transformation; step 6, feeding the q axis positive sequence component back to a software phase-locked loop and locking the angular frequency and a phase angle of a power grid; step 7, performing feedback on the angular frequency and the phase angle. Compared with the prior art, the positive and negative sequence fundamental component of the voltage of the power grid is rapidly and accurately locked in the normal, distortion, symmetrical fault, dissymmetrical fault and frequency change state of the voltage of the power grid through the characteristics of the SOGIs (Second-Order Generalized Integrator) and the cascaded DSC.

Description

technical field [0001] The invention relates to the fields of electric energy detection and electric energy application, in particular to a software phase-locked loop implementation method under unbalanced conditions. Background technique [0002] With the wide application of non-linear electrical equipment in the power system, especially power electronic devices, the problem of power quality pollution in the power system is becoming more and more serious and affects the quality of power supply. To this end, people have proposed high voltage direct current transmission system (HVDC) based on thyristor phase control technology, static var compensator (SVC) and controllable series compensator (TCSC), static synchronous compensator (STATCOM), dynamic voltage recovery (DVR) and active power filter (APF) and other equipment based on power electronic devices to improve voltage quality. In addition, with the continuous advancement of renewable energy power generation technologies ...

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 Patents(China)
IPC IPC(8): H02J3/00H03L7/085
CPCH02J3/00H02J3/01H03L7/085
Inventor 程启明郭凯徐聪黄伟黄山张海清
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com