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

Grid-connected control method for grid-connected inversion power supply

A technology of inverter power supply and control method, which is applied in the direction of single-network parallel feeding arrangement, etc., which can solve the problems of poor stability, poor dynamics, and slow grid-connected speed, and achieve strong stability, good dynamics, and fast grid-connected speed Effect

Inactive Publication Date: 2017-07-11
XUCHANG UNIV
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0023] Based on one or more of the above problems, the present invention provides a grid-connected control method for a grid-connected inverter power supply to solve the problem of single-phase voltage source type inverter power grid-connected with a single-phase public power grid in the prior art. Slow speed, poor stability, and poor dynamics

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
  • Grid-connected control method for grid-connected inversion power supply
  • Grid-connected control method for grid-connected inversion power supply
  • Grid-connected control method for grid-connected inversion power supply

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Embodiment 1 of the present invention provides a grid-connected control method for a grid-connected inverter power supply, wherein the inverter power supply in the grid system is connected to the common bus through an inverter unit, and operates in a parallel operation mode, such as figure 1 As shown, the method includes:

[0055] 101. Obtain the sine and cosine values ​​of the inverter power supply and the phase of the single-phase public grid;

[0056] Specifically, in this step, the phase-locked loop (feedback control circuit) is used to form the sine and cosine values ​​of the phases of the inverter power supply and the single-phase public grid, including:

[0057] After obtaining the inverter power supply and single-phase public grid voltage and frequency signals through the phase-locked loop, the frequency signals are respectively integrated to obtain the inverter power supply and single-phase public grid voltage phase signals, and then obtained by performing sine...

Embodiment 2

[0077] Embodiment 2 of the present invention provides a grid-connected control method for a grid-connected inverter power supply. In this method, the output voltage values ​​​​of the distributed power supply and the grid are calculated first, such as figure 2 Shown is a schematic diagram of the connection between the distributed power supply 1 and the grid, mainly including the distributed power supply 1, the grid-connected inverter 2, the output filter 3, the isolation transformer 4, the static switch 5 and the detection module 6, and the output current of the distributed power supply 1 After being converted into AC by the grid-connected inverter 2, it is fed into the AC grid by the static switch 5 through the output filter 3 through the isolation transformer 4.

[0078] In this embodiment, the detection module mainly includes distributed power supply and grid voltage, circuit acquisition and Clarke, Park transformation, comparison of grid voltage and grid-connected inverter vo...

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 grid-connected control method of a grid-connected inverter power supply, which includes: obtaining the sine and cosine values ​​of the inverter power supply and the phase of a single-phase public power grid; making the amplitude, phase and frequency of the reference signal of the inverter power supply follow the public power grid The amplitude, phase and frequency of the inverter power supply; compare the output voltage value of the inverter power supply with the grid voltage value to obtain the voltage comparison value between the inverter power supply and the grid voltage; when the voltage comparison value is within the preset error range , turn on the static switch and merge into the power grid. The grid-connected control method of the grid-connected inverter power supply of the present invention has the characteristics of fast grid-connected speed, strong stability, good dynamics and simple realization.

Description

technical field [0001] The invention relates to the technical field of power electronic device control, in particular to a grid-connected control method for a grid-connected inverter power supply. Background technique [0002] As environmental issues and energy issues are getting more and more attention, distributed power generation, especially renewable energy distributed power generation technology, is developing rapidly and has become the key development direction of energy supply in various countries. The traditional power grid is centralized power generation by large power plants, and the power is transmitted and distributed to scattered users through the power grid. There are problems such as large network loss and high transmission and distribution costs. Renewable energy usually has low power density and intermittent power generation. Due to the high randomness and randomness, the traditional centralized power generation method needs to occupy a large area, and becau...

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): H02J3/42
CPCH02J3/42
Inventor 郭利辉
Owner XUCHANG 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