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

Three-phase NPC grid-connected inverter based on repeated control

A repetitive control and compound controller technology, applied in the field of three-phase NPC photovoltaic grid-connected inverters and inverters, can solve problems such as poor output current waveform quality, and achieve the effect of high waveform quality and stable system

Inactive Publication Date: 2014-03-19
JIANGSU UNIV
View PDF4 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the traditional PI control can improve the response speed of the system and ensure the stability of the output current to a certain extent; but because the photovoltaic system is easily affected by periodic disturbances such as dead zone effects and nonlinear loads, the quality of the system output current waveform is poor.

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
  • Three-phase NPC grid-connected inverter based on repeated control
  • Three-phase NPC grid-connected inverter based on repeated control
  • Three-phase NPC grid-connected inverter based on repeated control

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:

[0015] In order to solve the problems of low output waveform quality and poor stability of traditional grid-connected inverters, the present invention proposes a three-phase NPC grid-connected inverter based on repetitive control. The principle of the whole system is as follows: figure 1 shown in figure 1 In the above, when the grid-connected inverter is running, the voltage of the three-phase grid is sampled and phase-locked by the PLL phase-locking module, and the voltage phase and frequency signals are obtained as the phase and frequency of the grid-connected current; at the same time, the current of the three-phase grid is sampled, Get the d-axis and q-axis current through Clark / Park transformation, and the given grid-connected current reference i d * , i q * Composite adjustment is done by the composite controller, and the adjusted result pas...

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 three-phase NPC photovoltaic grid-connected inverter based on repeated control. The inverter is based on an NPC topology structure. A system is composed of an LC filter module, a Clark / Park transformation module, a d-axis current regulator, a q-axis current regulator, a composite controller, a Clark / Park inverse transformation module and an SVPWM space vector module, wherein the composite controller is formed by connecting a PI controller and a repetition controller in parallel. Since system grid connection is needed, the reference signal of the q-axis current regulator is zero. Compared to the prior art, the inverter provided by the invention can realize inverter unit power factor grid-connected operation, can effectively inhibit periodical interference in a photovoltaic system at the same time, and can improve the system stability and reliability.

Description

technical field [0001] The invention belongs to the application field of power electronics and relates to an inverter, in particular to a three-phase NPC photovoltaic grid-connected inverter based on repetitive control. Background technique [0002] With the development of society and the advancement of science and technology, more and more resources are consumed by human beings, and the global energy crisis and environmental pollution problems are becoming more and more serious. Solar energy has attracted more and more attention due to its advantages of cleanness, practicality, and ease of large-scale development and utilization. In a photovoltaic system, the inverter is a key factor determining the quality of the output waveform, and the three-level diode-clamped (Neutral Point Clamped, NPC) inverter has a higher switching frequency and higher device tolerance than the two-level inverter. Low voltage, good output voltage waveform, small output harmonics, etc. [0003] Th...

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): H02M7/487H02J3/38
CPCY02E10/563Y02E10/56
Inventor 郑宏蒋超许象明蒋丽琴徐星亮
Owner JIANGSU 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