Unlock instant, AI-driven research and patent intelligence for your innovation.

Grid-connected impact current prediction and virtual inertia selection method containing virtual inertia model

A technology of virtual inertia and inrush current, applied in the direction of single grid parallel feeding arrangement, etc., can solve the problem that the adverse effects of grid-connected inrush current have not been solved, achieve high application value and engineering guiding significance, suppress grid-connected inrush current, The effect of the critical value calculation formula is concise and clear

Active Publication Date: 2020-04-21
XI AN JIAOTONG UNIV
View PDF8 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The virtual inertia has a positive effect on improving the dynamics of the microgrid under island operation, but its adverse effects on the grid-connected surge current have not been resolved. How to solve the impact caused by the virtual inertia is also a subject to be studied

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
  • Grid-connected impact current prediction and virtual inertia selection method containing virtual inertia model
  • Grid-connected impact current prediction and virtual inertia selection method containing virtual inertia model
  • Grid-connected impact current prediction and virtual inertia selection method containing virtual inertia model

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0035] In order to make the purpose and technical solution of the present invention clearer and easier to understand. The present invention will be further described in detail below in conjunction with the drawings and embodiments. The specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0036] The invention aims at predicting and suppressing the grid-connected impulse current based on the virtual inertia during the transient process of the grid-connected micro-grid using the droop control and virtual inertia combined control strategy.

[0037] Before introducing the specific implementation steps, first explain the variables in the formulas used as follows:

[0038] (1) J: virtual inertia value;

[0039] (2) ω inverter output angular frequency;

[0040] (3) V: output voltage amplitude of the inverter power supply;

[0041] (4) ω * and V * : Rated angular frequency of inverter power supply;

[0042] (5)V...

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 grid-connected impact current prediction and virtual inertia selection method containing a virtual inertia model. According to the method, a prediction calculation formula ofthe influence of the virtual inertia on the impact current is given for a microgrid droop control model introduced with virtual inertia based on mathematical analysis of a grid-connected transient model, and a method for suppressing the impact current by reasonably selecting a virtual inertia value is given. According to the method, the dynamic performance of the system is good, the grid-connected process is smooth and free of impact, and the method has important guiding significance and practical value for actual engineering design.

Description

technical field [0001] The invention belongs to the technical field of grid-connected control of micro-grids, and in particular relates to a grid-connected impulse current prediction method including a virtual inertia model and a virtual inertia selection method. Background technique [0002] With the rapid development of new energy sources, distributed power generation has been widely cited, which has attracted the attention of many researchers on microgrids. The microgrid can work in two modes of islanding and grid-connected, and it mainly adopts droop control. In order to obtain better dynamic performance, virtual inertia (J) is introduced into the control loop. The virtual inertia has a positive effect on improving the dynamics of the microgrid under island operation, but some adverse effects on the grid-connected impulse current have not been resolved. How to solve the impact caused by the virtual inertia is also a subject to be studied. Contents of the invention ...

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): H02J3/40
CPCH02J3/40
Inventor 易皓张枭王振雄卓放龚培娇唐启迪王瑞李建伟
Owner XI AN JIAOTONG UNIV