Check patentability & draft patents in minutes with Patsnap Eureka AI!

Control method of virtual synchronous generator under unbalanced power grid

A virtual synchronization and control method technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve the problems of three-phase asymmetry of the output current, affecting the power quality of the grid, and disconnecting the grid-connected equipment to achieve stable switching, Effects of shortening transient time and output current balance suppression

Pending Publication Date: 2022-03-11
JIANGSU UNIV
View PDF0 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large number of grid-connected new energy power generation equipment reduces the operating burden of the grid. However, when an asymmetrical voltage drop occurs in the grid, the new energy power generation device will have three-phase asymmetric output current and power oscillation. A large number of grid-connected inverters This situation will seriously affect the power quality of the power grid, causing a large area of ​​grid-connected equipment to go off-grid, causing major disasters

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
  • Control method of virtual synchronous generator under unbalanced power grid
  • Control method of virtual synchronous generator under unbalanced power grid
  • Control method of virtual synchronous generator under unbalanced power grid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0024] A control improvement measure of VSG under unbalanced power grid. The control improvement strategy of VSG under unbalanced power grid includes outputting three-phase current balance and eliminating power oscillation; balanced current is controlled by separating negative sequence current; eliminating power oscillation is eliminated Negative sequence components of voltages combined with methods of balancing currents, including:

[0025] Under the condition of unbalanced grid voltage, the voltage and current in the d-q coordinate system can be decomposed into positive sequence and negative sequence components, as shown in formula (1)

[0026]

[0027] In the formula, the superscripts "+" and "-" represent the...

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 control method of a virtual synchronous generator under an unbalanced power grid, and belongs to the technical field of new energy based on distributed power generation. The research method of the VSG based on the ideal working condition is not suitable for the condition of asymmetrical power grid voltage with the problems of unbalanced output current, power oscillation and the like. After the operation mechanism of the VSG under the asymmetric working condition is analyzed, a new control strategy is provided. According to the method, the two problems of current imbalance and power oscillation are solved at the same time by rejecting a voltage negative-sequence component and controlling a current negative-sequence component. In addition, power grid voltage feed-forward control is provided, and impact current generated at the moment of power grid voltage drop and recovery is restrained.

Description

technical field [0001] The invention relates to the field of new energy technology of distributed power generation, in particular to a control strategy under unbalanced grid voltage conditions. Background technique [0002] The environmental problems and energy crisis caused by traditional fossil energy have become a major problem that plagues people at this stage, and distributed generation (DGs) based on renewable energy has attracted widespread attention. A large number of grid-connected new energy power generation equipment reduces the operating burden of the grid. However, when an asymmetrical voltage drop occurs in the grid, the new energy power generation device will have three-phase asymmetric output current and power oscillation. A large number of grid-connected inverters This situation will seriously affect the power quality of the power grid, causing a large area of ​​grid-connected equipment to go off-grid, causing major disasters. Therefore, it is necessary to ...

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): H02J3/38H02J3/48H02J3/50H02J3/26H02J3/24
CPCH02J3/381H02J3/48H02J3/50H02J3/26H02J3/24Y02E40/50
Inventor 孙宇新高枫施凯徐培凤任明炜蔡浩
Owner JIANGSU UNIV
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com