Method and system for controlling three-phase four-wire inverter

A three-phase four-wire, control method technology, applied in the direction of irreversible DC power input conversion to AC power output, output power conversion device, electrical components, etc., can solve the problem of complex controller design process and other issues

Active Publication Date: 2017-08-18
CENT SOUTH UNIV
View PDF3 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the traditional technology, the output voltage closed-loop control is realized by designing a suitable PI co

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
  • Method and system for controlling three-phase four-wire inverter
  • Method and system for controlling three-phase four-wire inverter
  • Method and system for controlling three-phase four-wire inverter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0025] In recent years, the predictive control method has been widely used in power electronic converters; this method is simple to implement, the steps are clear, and the obtained system performance is excellent. However, this method has not been used in split capacitor three-phase four-wire inverters. Therefore, it is necessary to design a predictive control method for a three-phase four-wire inverter under load disturbances, so that the output voltage performance is excellent and the DC side voltage equalization effect is good.

[0026] The purpose of the present invention is to design a predictive control method for a three-phase four-wire inverter under load disturba...

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 provides a method and system for controlling a three-phase four-wire inverter. The method comprises the steps of 1, acquiring all on-off states of a three-phase four-wire inverter to be predicted, and building a variable relation model of the three-phase four-wire inverter at a load disturbance state; 2, acquiring a voltage change pattern of a DC-side capacitor of the three-phase four-wire inverter, and acquiring predicted values of inductor current and capacitor voltage of an output side of the three-phase four-wire inverter in the next sampling period; and 3, selecting an on-off state, which enables a cost function result value to be the minimum, from all of the on-off states in each sampling period of the three-phase four-wire inverter to act as the on-off state of the three-phase four-wire inverter in the next sampling period. According to the invention, the distortion in voltage of an output filtering capacitor under load disturbance can be effectively suppressed, the inverter is enabled to output sinusoidal asymmetric three-phase voltage, and the voltage-sharing effect at the DC side is good; and meanwhile, the DC side can be enabled to acquire a good voltage-sharing effect under the condition that capacitance values of the capacitor are inconsistent.

Description

technical field [0001] The present invention relates to the technical field of inverter control, and more specifically, to a control method and system for a three-phase four-wire inverter. Background technique [0002] At present, with the development of power electronics technology, three-phase inverters are widely used in smart grids, renewable energy systems, distributed power generation systems and other systems. When the three-phase inverter has an unbalanced load, or the inverter is connected in parallel to the unbalanced grid; usually a three-phase four-wire inverter is required, and the three-phase four-wire inverter is generally divided into two types: split capacitor type, four-arm type. In the split capacitor three-phase four-wire inverter, the midpoint of the split capacitor serves as the neutral point of the load, the neutral wire provides a channel for the zero-sequence current, and finally the neutral wire current flows into the midpoint of the split capacito...

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): H02M7/48
CPCH02M7/48H02M1/0003
Inventor 车如宇孙尧杨建粟梅万江湖刘福临赵梓亦董辉
Owner CENT SOUTH UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap