A Method and Device for Islanding Detection Based on Frequency Feedback Disturbance

A technology of island detection and frequency feedback, applied in circuit devices, AC network circuits, electrical components, etc., can solve the problems of easy missed detection, affecting power quality, increasing system harmonics, etc., to shorten the time and reduce the detection blind area. Effect

Active Publication Date: 2017-09-22
河南许继电力电子有限公司 +1
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The passive detection method detects the abnormal phenomenon of the voltage at the common point between the inverter and the grid (such as over / under voltage, over / under frequency), which is easy to miss
Active detection, such as disturbance detection, can overcome detection blind spots by artificially increasing disturbances, but artificial disturbances will increase system harmonics and affect power quality

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
  • A Method and Device for Islanding Detection Based on Frequency Feedback Disturbance
  • A Method and Device for Islanding Detection Based on Frequency Feedback Disturbance
  • A Method and Device for Islanding Detection Based on Frequency Feedback Disturbance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0025] The method of the present invention is applicable to the inverter interface grid-connected system, specifically, such as figure 1 A control block diagram of a photovoltaic inverter based on rotation transformation is given, and the present invention is described in detail using this system as an example.

[0026] The photovoltaic PV array of the system is connected to the grid-connected point through the output of the three-phase full-bridge inverter. i 1a , i 1b , i 1c is the three-phase current at the output terminal of the inverter; e a 、e b 、e c is the grid-side voltage for input to the PLL phase-locked loop output phase θ for i 1a , i 1b , i 1c The three-phase coordinate system of the three-phase current is rotated to the two-phase static coordinate system to realize the independent control of active current and reactive current, and fina...

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 relates to an island detection method and device based on frequency feedback disturbance, comprising: a preliminary judgment step: detecting grid parameters, and preliminary judging whether to enter the island state; a disturbance step: if entering the island state, the frequency output by the phase-locked loop and the power grid The frequency difference of the frequency is adjusted by the PI controller, which is output to the reactive current control link as the reactive current input reference value iq*+; re-judgment step: check the grid parameters again to judge whether the islanding effect really occurs. The invention combines passive islanding detection with active islanding detection, can reduce the detection blind spot of the inverter, and can detect the occurrence of the islanding phenomenon accurately and quickly; The introduction of harmonics to the grid reduces the impact of the islanding detection algorithm on the total harmonic content of the inverter output current.

Description

technical field [0001] The invention relates to an island detection method and device based on frequency feedback disturbance. Background technique [0002] With the increasing pressure on the global resource environment, energy conservation and emission reduction and resource conservation have become the trend of world economic development. Focusing on the development of green economy and strengthening energy conservation and emission reduction, we will accelerate the goal of building a resource-saving and environment-friendly society" Above. As a widely used energy source, electric energy has penetrated into all aspects of industrial production, society and people's life. At present, the power generation system composed of new energy is represented by wind power and solar grid-connected power generation; With the grid-connected power generation system, the distributed power supply will continue to supply power to the distribution network disconnected from the grid. This ph...

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): H02J3/00
Inventor 陈北海刘刚梁燕孙健芦开平李建伟黄小有郭寅远高志军
Owner 河南许继电力电子有限公司
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