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

Subsynchronous oscillation suppression method for doubly-fed unit grid-connected system, and related device

A technology of subsynchronous oscillation and doubly-fed units, applied in circuit devices, reducing/preventing power oscillations, AC network circuits, etc., can solve problems such as large system power shortage and large power system safety accidents.

Active Publication Date: 2020-10-23
SUNGROW POWER SUPPLY CO LTD
View PDF12 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the system is disturbed, it will cause sub-synchronous oscillation of the system, which may cause a large area of ​​the entire wind farm grid-connected unit to go off-grid, resulting in a large system power deficit, which will cause a large power system safety accident

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
  • Subsynchronous oscillation suppression method for doubly-fed unit grid-connected system, and related device
  • Subsynchronous oscillation suppression method for doubly-fed unit grid-connected system, and related device
  • Subsynchronous oscillation suppression method for doubly-fed unit grid-connected system, and related device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0047] See figure 1 , Shows a schematic diagram of a doubly-fed unit grid-connected system provided by an embodiment of the application, such as figure 1 As shown, the stator winding of the doubly-fed asynchronous wind generator DGIF is directly connected to the power grid, and the rotor winding is connected to the power grid through the converter. Specifically, the rotor winding is connected to the power grid through the rotor-side converter and the grid-side converter.

[0048] In order to improve the grid connection capability and power transmission capability of wind farms, capacitor C is usually connected in series on the transmission line, but under certain conditions, this will stimulate the subsynchronous oscillation of the wind turbine and the series compensation capacitor. When a small disturbance occurs in the system, the electrical quantity of the wind turbine grid-connected system may oscillate or even diverge, resulting in a unit disconnection. When the grid-connected...

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 provides a subsynchronous oscillation suppression method for a doubly-fed unit grid-connected system, and a related device. The method comprises the following steps: obtaining a subsynchronous component in a grid-connected current, and converting the subsynchronous component of the grid-connected current to a rotor side, thereby obtaining a rotor side subsynchronous component; and feeding back the subsynchronous component of the rotor side to a current regulator of the rotor side to control the rotor current. The subsynchronous component in the grid-connected current induces thesubsynchronous component on the rotor side, and the subsynchronous component of the grid-connected current is converted to the rotor side, so compared with the prior art, the method has the advantagesthat a group of inverted sub-synchronous components are superposed on the rotor side equivalently, and the inverted sub-synchronous components can induce a group of inverted sub-synchronous components on the stator side, so that the subsynchronous components of stator current on the rotor side are counteracted, the sub-synchronous components introduced by a grid-side converter can be suppressed,and the sub-synchronous oscillation of the doubly-fed unit grid-connected system is suppressed more effectively.

Description

Technical field [0001] The invention belongs to the field of electric power technology, and in particular relates to a subsynchronous oscillation suppression method and related devices of a doubly-fed unit grid-connected system. Background technique [0002] With the increase in the penetration rate of the grid-connected wind power generation capacity in the power system, however, the reverse distribution pattern of wind resources and load centers, so large-scale and long-distance power transmission has become an effective way to utilize wind energy resources. [0003] In order to improve the grid-connected capacity and power delivery capacity of wind farms, it is usually necessary to connect capacitors in series on the transmission line to enhance the electrical connection between the wind farm and the system to increase the transmission power limit of the line, but this will stimulate wind turbines under certain conditions Subsynchronous oscillation with series compensation capac...

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): H02J3/24H02J3/38
CPCH02J3/24H02J3/381H02J2300/28
Inventor 周生孟祥志杨春源梁信信杨辉王圣明
Owner SUNGROW POWER SUPPLY 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