Photovoltaic power generation grid-connected tie line pilot protection method and system based on comprehensive impedance

A photovoltaic power generation and comprehensive impedance technology, which is applied to emergency protection circuit devices, emergency protection data processing devices, electrical components, etc. The effect of high reliability and sensitivity

Inactive Publication Date: 2021-09-24
STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST +2
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method and system for longitudinal protection of photovoltaic power generation grid-connected tie line based on comprehensive impedance, whi

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
  • Photovoltaic power generation grid-connected tie line pilot protection method and system based on comprehensive impedance
  • Photovoltaic power generation grid-connected tie line pilot protection method and system based on comprehensive impedance
  • Photovoltaic power generation grid-connected tie line pilot protection method and system based on comprehensive impedance

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0020] In order to make the objects, technical solutions, and advantages of the present invention more clearly, the technical solutions in the embodiments of the present invention will be described in contemplation in the embodiments of the present invention, and will be described, and the embodiments described herein will be described. It is a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, those of ordinary skill in the art will belong to the scope of the present invention without all other embodiments obtained without creative labor.

[0021] See figure 1 Which shows a flowchart of the present application a photovoltaic power generation based on the combined impedance of the grid contact line longitudinal protection method.

[0022] like figure 1 As shown in step 1, after starting the operation member, respectively, based on the extracted pilot protection device PV grid phase voltage sample values ...

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 photovoltaic power generation grid-connected tie line pilot protection method and system based on comprehensive impedance. The method comprises the steps of respectively extracting three-phase voltage sampling values and current sampling values at two sides of a photovoltaic power generation grid-connected tie line based on a pilot protection device after a starting element acts; respectively extracting a three-phase voltage power frequency phasor and a three-phase current power frequency phasor through a fast Fourier algorithm, and calculating a differential voltage phasor and a differential current phasor according to phases; based on the differential voltage phasor and the differential current phasor, calculating three-phase comprehensive impedance in the grid-connected tie line, and taking imaginary absolute values of the three-phase comprehensive impedance respectively; respectively comparing the imaginary absolute values of the three-phase comprehensive impedance with a protection setting threshold value; and executing a corresponding protection action based on a comparison result. According to the method, internal and external faults can be distinguished without being influenced by a photovoltaic inversion control strategy, and the method has relatively high anti-transition resistance capability and high reliability and sensitivity.

Description

technical field [0001] The invention belongs to the technical field of electric power system relay protection, and in particular relates to a method and system for longitudinal protection of grid-connected tie lines of photovoltaic power generation based on comprehensive impedance. Background technique [0002] With the development of renewable energy and the implementation of a sustainable energy development strategy, photovoltaics has become a hot spot in the development of new energy due to its unique advantages. At the same time, the access of photovoltaic systems has also brought many impacts on the protection of the current power grid. The random fluctuation of photovoltaic power output and the influence of control structure and control strategy in the process of grid-connected inverter make the fault characteristics of photovoltaic system more complicated. Changes in system fault characteristics after power is connected will cause protection performance to decline, or...

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): H02H7/26H02H1/00
CPCH02H7/263H02H1/0092
Inventor 桂小智潘本仁梁振锋张妍万勇王冠南蒙天赐周仕豪
Owner STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST
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