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

Islanding and grid-connection mode online smooth switching method for flexible direct-current converter valve

A network mode and smooth switching technology, which is applied in the direction of power transmission AC network, reducing/preventing power oscillation, etc., can solve problems affecting the quality of load power supply, output voltage fluctuation, load voltage and frequency mutation, etc., to avoid modulation signal mutation, Effect of reducing current impact and improving stability

Active Publication Date: 2020-01-31
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
View PDF12 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The output power of the converter valve remains unchanged, so the load voltage and frequency will change suddenly due to power imbalance, which may cause output voltage fluctuations during switching, affecting the quality of load power supply

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
  • Islanding and grid-connection mode online smooth switching method for flexible direct-current converter valve
  • Islanding and grid-connection mode online smooth switching method for flexible direct-current converter valve
  • Islanding and grid-connection mode online smooth switching method for flexible direct-current converter valve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] The specific embodiments provided by the present invention will be described in detail below in conjunction with the accompanying drawings.

[0023] Such as figure 1 As shown in the figure, a method for smooth switching between the island and the networking mode of the flexible DC converter valve, the method includes: an active power command switching module, a reactive power command switching module, a power control module, a voltage control module and a current control module; the active power command switching module The second active power reference signal P at the output of the module ref2 and the second reactive power reference signal Q at the output terminal of the reactive power command switching module ref2 Respectively with the active power reference input terminal P of the power control module ref and reactive power given input Q ref Phase connection, the d-axis voltage given signal U of the output terminal of the power control module dref and q-axis volt...

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 an islanding and grid-connection mode online smooth switching method for a flexible direct-current converter valve. The method involves an active instruction switching module,a reactive instruction switching module, a power control module, a voltage control module and a current control module; the output end of the active power instruction switching module and the output end of the reactive power instruction switching module are connected with the active given input end and reactive given input end of the power control module respectively; the output end of the power control module is connected with the input end of the voltage control module and the input end of the active instruction switching module; the output end of the voltage control module is connected withthe input end of the current control module after being added with power grid feedforward current and passing through an amplitude limiting link; and the current control module outputs the final dq-axis voltage modulation signals of the converter valve. With the method of the invention adopted, the stability of the flexible direct current converter valve in an islanding and grid-connection operation mode switching process can be improved.

Description

technical field [0001] The invention relates to the technical field of flexible direct current transmission converter valve control, in particular to an online smooth switching method for flexible direct current converter valve islands and networking modes. Background technique [0002] Flexible HVDC converter valves have been widely used in grid asynchronous interconnection, wind power and other large-scale new energy grid connection and other fields. The converter valve usually adopts a modular multi-level structure, and multiple power modules are connected in series to form a bridge arm of the converter valve. , The six bridge arms of the converter valve are symmetrical, and each power module is composed of fully-controlled power devices (IGBT, IEGT) connected in a half-bridge or full-bridge form. Flexible HVDC converter valves can connect weak AC systems, supply power to passive networks, and increase the penetration power of wind power and other new energy sources into ...

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 Applications(China)
IPC IPC(8): H02J3/36H02J3/24
CPCH02J3/36H02J3/24Y02E60/60
Inventor 陈俊周月宾邹常跃史尤杰王国强翁海清张海涛易荣鲁挺岳伟
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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