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

Active energy control method for offshore wind power grid-connected system under AC fault

An offshore wind power and energy control technology, applied in power transmission AC networks, wind power generation, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., to avoid lock-up, reduce response speed requirements, and improve reliability.

Active Publication Date: 2021-10-08
HUAZHONG UNIV OF SCI & TECH
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides an active energy control method under the AC fault of the offshore wind power grid-connected system through the flexible grid, aiming at solving the DC overvoltage problem of the grid-connected system caused by the failure of the AC grid at the receiving end at a relatively low economic cost, and at the same time Significantly reduce technical requirements for communication systems and energy-consuming devices

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
  • Active energy control method for offshore wind power grid-connected system under AC fault
  • Active energy control method for offshore wind power grid-connected system under AC fault
  • Active energy control method for offshore wind power grid-connected system under AC fault

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] An active energy control method for an offshore wind power grid-connected system via a flexible direct-current system under an AC failure at the receiving end. The direct-flexible power transmission system in the grid-connected system includes DC and AC voltage stations, and the method includes:

[0067] After an AC fault occurs at the receiving end, the DC voltage station is controlled to perform passive energy recovery, so that the internal capacitor of the DC voltage station is passively charged to the first preset value of the capacitor energy;

[0068] When the capacitor energy of the DC voltage station reaches its first preset value, the DC voltage station is controlled to maintain active energy, so that the energy of the internal capacitor of the DC voltage station is kept at the first preset value, and the DC is disconnected during this period The AC switch on the AC side of the voltage station and the input energy consumption device;

[0069] After the AC fault...

Embodiment 2

[0148] A control system that executes the energy control method under the AC failure of the receiving end of the offshore wind power grid-connected system through flexible grids as described in the first embodiment above when an AC fault occurs at the receiving end of the offshore wind power grid-connected system through flexible grids. The relevant technical solutions are the same as those in Embodiment 1, and will not be repeated here.

Embodiment 3

[0150] An offshore wind power grid-connected system via a flexible direct grid. The flexible direct transmission system in the grid-connected system includes a DC voltage station and an AC voltage station. Execute the following operations described in the energy control method of the receiving end AC fault of the offshore wind power grid-connected system through flexible direct grid as described in the first embodiment: disconnect and close the AC switch; control the charging of the capacitor in the DC voltage station , Energy maintenance and energy release; Control the opening and exit of energy-consuming devices; Send commands to AC voltage stations and offshore wind turbines.

[0151] On the one hand, this system recovers excess power through capacitors, and uses the capacitors inside the converter to recover energy during the AC power grid failure period. On the other hand, it can effectively absorb the surplus power of the flexible direct transmission system and suppress t...

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 active energy control method for the receiving end of an offshore wind power grid-connected system via a flexible straight grid. During the period, control the opening and closing of the AC switch, and control the input and exit of the energy-consuming device; control the energy release of the DC voltage station to reduce the capacitor energy to the rated value; during the passive energy recovery period of the DC voltage station, control the AC voltage station Active energy recovery is carried out, so that the capacitor in the station is actively charged to the second preset value and maintained; when the capacitor energy of the DC voltage station drops to the rated value, the capacitor energy of the AC voltage station is reduced to the rated value. The invention can solve the power surplus problem caused by the AC failure of the receiving end of the offshore wind power through the flexible straight grid-connected system with a small economic cost, suppress the DC overvoltage, and greatly reduce the technical requirements for the communication system and energy-consuming devices.

Description

technical field [0001] The invention belongs to the field of power transmission and distribution of electric power systems, and more specifically relates to an active energy control method for an offshore wind power grid-connected system through flexible straight grids under AC faults. Background technique [0002] Due to the urgent need of new energy development, the flexible DC transmission technology based on Modular multilevel converter (MMC) has been developed rapidly. When the flexible direct current transmission system (hereinafter referred to as the flexible direct transmission system) is used for offshore wind power grid connection, the AC voltage station at the sending end provides an AC voltage that meets the requirements for the offshore wind farm through the AC voltage controller; The controller controls the DC voltage of the flexible direct transmission system. Since the AC voltage station at the sending end cannot control the active power injected by the offs...

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): H02J3/28H02J3/38H02J3/36H02H7/26H02H9/04H02J13/00
CPCH02H7/268H02H9/04H02J3/28H02J3/36H02J3/38H02J13/00007H02J2300/28Y02E10/76Y02E40/70Y02E60/00Y02E60/60Y02E70/30Y04S10/123Y04S10/14Y04S10/20Y04S40/121
Inventor 文劲宇周猛左文平向往林卫星
Owner HUAZHONG UNIV OF SCI & TECH
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