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

Inverter phase sequence detection phase locking device and phase locking and phase sequence identifying method

An inverter and phase-locking technology, applied in the field of converters, can solve the problems of inverter output current distortion, inability to automatically detect phase-locking accuracy, and the influence of inverter performance, so as to reduce the influence of grid-connected current, The effect of simple and reliable hardware design and high-performance phase-locking function

Active Publication Date: 2014-07-02
SHAANXI COAL & CHEM TECH INST
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The input of the phase-locking method is the grid voltage. When the grid is impacted or distorted, the phase-locking method will be affected, resulting in the distortion of the output current of the inverter, the phase-sequence cannot be automatically detected, and the phase-locking caused by voltage distortion and other reasons Accuracy will affect the performance of the inverter

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
  • Inverter phase sequence detection phase locking device and phase locking and phase sequence identifying method
  • Inverter phase sequence detection phase locking device and phase locking and phase sequence identifying method
  • Inverter phase sequence detection phase locking device and phase locking and phase sequence identifying method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0031] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0032] see figure 1 and figure 2 As shown, the inverter phase-sequence detection and phase-locking device of the present invention includes a waveform limiting and shaping circuit connected to the three-phase power grid, which performs waveform shaping on the input alternating current and a DSP control chip for phase-sequence detection and phase-locking, It also includes a level conversion circuit connected between the waveform limiting and shaping circuit and the DSP control chip. The three-phase power grid is connected with the waveform limiting and shaping circuit, the waveform limiting and shaping circuit is connected with the level conversion circuit, and the level conversion circuit is connected with the DSP control chip.

[0033] In a specific embodiment, the waveform limiting and shaping circuit is composed of three circuits includi...

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 current phase sequence detection and phase locking device for a three-phase inverter and a phase locking and phase sequence identifying method. The device comprises a waveform amplitude limiting and shaping circuit which is used for waveform amplitude limiting and shaping of an input alternating current, a digital signal processor (DSP) control chip which is used for phase sequence detection and phase locking, and a level conversion circuit which is connected between the waveform amplitude limiting and shaping circuit and the DSP control chip. The method comprises the following steps of: determining the frequency of a power grid, and identifying phase sequence and phase locking. Based on the original inverter, the device and the method realize the automatic detection of phase sequence and phase locking by using the waveform amplitude limiting and shaping circuit and the level conversion circuit, and solve the problem of operation failure of the inverter caused by phase sequence error and output current waveform distortion of an inverter system caused by complete software phase lock.

Description

technical field [0001] The invention relates to the field of converters, in particular to a phase-sequence detection and phase-locking device for an inverter requiring grid-connection and a method for phase-locking and phase-sequence identification based on the device. Background technique [0002] Before the inverter is connected to the grid, it is necessary to detect the phase sequence of the three-phase sine wave voltage of the grid to prevent the reverse connection of the phase sequence from affecting the work of the inverter. In the inverter without phase sequence automatic detection, it is necessary to confirm the phase sequence relationship before connection to prevent phase sequence errors. In the process of inverter space vector modulation, it is necessary to obtain the electrical angle of the power grid through phase locking, which is used for coordinate transformation. Traditional phase-locking methods such as Figure 8 As shown, it samples the grid voltage throu...

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): H02M7/42
Inventor 田占元王苏健
Owner SHAANXI COAL & CHEM TECH INST
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