Grid-connected access anti-reverse-flow intelligent detection method for distributed power generation

A technology of distributed power generation and intelligent detection, which is applied in the direction of measuring current/voltage, phase angle between voltage and current, measuring devices, etc., can solve the problem of low discrimination accuracy and unsafe and stable distributed power generation system and distribution network Operation and other problems to achieve the effect of anti-backflow control and enhanced accuracy

Active Publication Date: 2014-05-07
STATE GRID CORP OF CHINA +2
View PDF4 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing distributed generation grid-connected anti-backflow detection method is not high in discrimination accuracy, and reverse power operation conditions often occur, resulting in the inability of the distributed generation system and the distribution network to operate safely and stably

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 access anti-reverse-flow intelligent detection method for distributed power generation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023] Such as figure 1 Shown, the present invention comprises the following steps:

[0024] A: Use the current collection module and the voltage collection module to collect the three-phase current and three-phase voltage of the grid-connected point.

[0025] B: Use the positive sequence current calculation module and the positive sequence voltage calculation module to digitize the three-phase current and three-phase voltage collected by the current acquisition module and the voltage acquisition module respectively, and calculate the positive sequence current and positive sequence voltage of the grid-connected point.

[0026] C: Use the reverse current discrimination module to monitor the angle difference between the positive sequence current and the positive sequence voltage in real time to determine whether a reverse power condition occurs. If a reverse power condition occurs, the reverse current discrimination module sends an instruction to the rising edge drive trip comma...

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 access anti-reverse-flow intelligent detection method for distributed power generation. The method comprises the following steps: A, the three-phase current and the three-phase voltage of a grid-connected point are acquired; B, the three-phase current and the three-phase voltage are digitally processed, and the positive-sequence current and the positive-sequence voltage of the grid-connected point are calculated; C, the angle difference between the positive-sequence current and the positive-sequence voltage is monitored, whether a reverse-power condition occurs is judged, an instruction is issued if a reverse-power condition occurs, and the method returns to step B if no reverse-power condition occurs; and D, a rising edge drive tripping command output module issues a tripping command to a circuit breaker control module to disconnect a circuit breaker of the grid-connected point. According to the method of the invention, the flow direction of output power of a distributed grid-connected power generation system can be sensitively and accurately identified, and a tripping command is issued when reverse power occurs so as to disconnect the circuit breaker of the grid-connected point.

Description

technical field [0001] The invention relates to the field of relay protection of electric power systems, in particular to an intelligent detection method for anti-backflow applied to distributed power generation grid connection. Background technique [0002] As an effective supplement to centralized power generation, distributed power generation and its system integration technology have become increasingly mature. With the continuous decline in the production price per kilowatt of electricity and the strong support at the policy level, distributed generation technology is being more and more widely used. Since the grid-connected operation of distributed power and traditional power systems will have a certain impact on the environment, economy, and power system operation, control and protection, all countries are formulating grid-connected standards for distributed power. The distributed power supply grid-connected interface device is installed at the connection between the...

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): H02H7/00H02J3/38G01R19/00G01R25/00
Inventor 杨海晶石光赵勇宋宁希王心妍魏文秀吴双惠郭红鼎张鹏远李现伟
Owner STATE GRID CORP OF CHINA
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