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

Single-phase system phase-locked-loop-free instantaneous power calculation and phase-locked-loop-free frequency compensation algorithm

A non-phase-locked loop, frequency compensation technology, applied in the direction of irreversible AC power input conversion to DC power output, etc., can solve the problem of increasing system complexity and software and hardware design difficulties, inaccurate calculation of instantaneous power, single-phase system network Difficulties in pressure locking and other problems, to achieve the effect of small space, simple algorithm and high precision

Active Publication Date: 2014-11-05
SOUTHWEST JIAOTONG UNIV
View PDF4 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this regard, it is proposed to use a microprocessor to collect the grid-side voltage and current signals, store and delay to obtain a virtual grid-side voltage and current signal orthogonal to the grid-side voltage and current, and use it to calculate the instantaneous power of the single-phase system. However, this algorithm takes up Too much memory space, and when the voltage and current suddenly change, the instantaneous power cannot be accurately calculated
In order to realize the direct power control of the single-phase pulse rectifier, the grid-side voltage phase-locked loop is needed. However, the phase-locking of the grid voltage of the single-phase system is relatively difficult. Generally, it is necessary to realize the phase-locking of the single-phase system through a virtual signal orthogonal to the grid voltage or use Hardware phase-locked, so single-phase system network voltage phase-locked loop increases system complexity and difficulty in software and hardware design

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
  • Single-phase system phase-locked-loop-free instantaneous power calculation and phase-locked-loop-free frequency compensation algorithm
  • Single-phase system phase-locked-loop-free instantaneous power calculation and phase-locked-loop-free frequency compensation algorithm
  • Single-phase system phase-locked-loop-free instantaneous power calculation and phase-locked-loop-free frequency compensation algorithm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0033] figure 1 Shown is a block diagram of the functional division of a single-phase direct power control system without a phase-locked loop. The whole system can be divided into local sine and cosine signal calculation 01, grid side voltage and current acquisition 02, single-phase non-PLL power calculation 03, network voltage amplitude calculation 04, frequency compensation matrix component calculation 05, frequency compensation matrix 06, direct power Control 07, space vector pulse width modulation 08, voltage PI outer loop control 09, power frequency coordinate transformation 10 ten parts. The specific contents of the main parts are:

[0034] (1) Local sine and cosine signal calculation 01

[0035] Through the timing interrupt of the microcontroller, the sine and cosine signals equal to the angular frequency of the power frequency are sent out in the control cycle or sampling cycle, which is single-phase non-phase-locked loop power calculation 03, network voltage amplitu...

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 single-phase system phase-locked-loop-free instantaneous power calculation and phase-locked-loop-free frequency compensation algorithm. The algorithm mainly comprises two parts including single-phase phase-locked-loop-free power calculation (03) and frequency compensation matrix component calculation (05), the single-phase system instantaneous power calculation (03) and the frequency compensation matrix component calculation (05) can be achieved only through a local sine and cosine signal (01), a digital filter and simple operation, phase-locked loops are not needed, the design difficulty of the phase-locked loops is reduced, and the software and hardware design difficulty is further reduced.

Description

technical field [0001] The invention relates to the field of design and manufacture of a single-phase PWM converter (including a pulse rectifier and a PWM inverter) control system in the field of power electronics and power transmission. Background technique [0002] Single-phase pulse rectifiers have the advantages of bidirectional energy flow, grid side voltage and current maintain unity power factor, and DC side voltage is constant, so they are widely used in high-power traction drive systems. At present, the control algorithm of single-phase rectifier mainly includes indirect current control, hysteresis current control, transient current control and dq axis current decoupling control. [0003] In order to improve the control accuracy and dynamic performance of the rectifier, a direct power control algorithm suitable for three-phase rectifiers is proposed. This algorithm is based on the theory of instantaneous power, directly controls active power and reactive power, and ...

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): H02M7/12
Inventor 宋文胜马俊鹏熊成林冯晓云葛兴来王青元
Owner SOUTHWEST JIAOTONG UNIV
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