Alternating-current/direct-current hybrid micro-grid layered control method based on electricity price

An AC-DC hybrid and layered control technology, which is applied to a single AC network with different frequencies, AC network load balancing, and power network operating system integration. Plug and play and other issues

Active Publication Date: 2016-05-04
JIANGSU DAYBRIGHT INTELLIGENT ELECTRIC CO LTD
View PDF6 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This control structure has high requirements on the central controller and communication equipment. Once a certain link fails, it may affect th

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
  • Alternating-current/direct-current hybrid micro-grid layered control method based on electricity price
  • Alternating-current/direct-current hybrid micro-grid layered control method based on electricity price
  • Alternating-current/direct-current hybrid micro-grid layered control method based on electricity price

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Embodiment 1: The bus voltage control layer connects the scattered converter units into a whole through the common DC bus, uses the DC bus voltage signal to arrange the power exchange of each unit in an orderly manner, realizes the power balance in the DC system, and ensures the DC bus voltage at the same time within reason. Such as figure 1 The illustrated embodiment converts the DC link voltage U dc The range of change is divided into 4 voltage intervals, and the voltage value of the boundary line is U from high to low. 3_H , U 2_H , U 1_H , U 1_L , U 2_L , when the DC bus voltage U dc fall into the interval [U 2_H ,U 3_H ], the bus voltage control layer works in mode 3, and the distributed generation unit switches to the slack terminal; when the DC bus voltage U dc fall into the interval [U 1_H ,U 2_H ] and interval [U 2_L ,U 1_L ], the bus voltage control layer works in mode 2, and the grid-connected converter switches to the slack terminal; when the DC...

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 an alternating-current/direct-current hybrid micro-grid layered control method based on electricity price. The control for an alternating-current/direct-current hybrid micro-grid is divided into three layers such as a converter control layer, a bus voltage control layer and a power scheduling layer. On the bottom converter control layer, all kinds of converters are divided into energy terminals and relax terminals according to control objectives thereof; on the middle bus voltage control layer, any unit in the alternating-current/direct-current hybrid micro-grid can smoothly adjust the output power of an interface converter thereof according to a direct-current bus voltage signal under a same control structure, so that dispersion autonomous operation of the alternating-current/direct-current hybrid micro-grid is realized; on the upper power scheduling layer, a grid-connected converter decides a specific operating state according to time-of-use electricity price information on an alternating-current grid side, and then the output power of an energy storage unit is changed so as to make full use of remaining capacity thereof and improve the economy and schedulability of system operation.

Description

technical field [0001] The invention relates to the technical field of distributed power generation microgrids, in particular to a hierarchical control method for AC / DC hybrid microgrids based on electricity prices. Background technique [0002] With the continuous improvement of users' attention to power supply reliability and power quality and the extensive use of various forms of renewable energy such as solar energy and wind energy, microgrids, as an effective way for distributed power to connect to the grid, have attracted widespread attention from scholars at home and abroad. . Microgrid generally refers to a small grid form that connects various distributed power sources, energy storage devices and loads through power electronic devices. isolated system running. [0003] Compared with AC microgrids, DC microgrids have many distinctive features. First of all, most distributed power sources, such as photovoltaic cells and wind generators, basically output DC power (o...

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): H02J3/02H02J3/12H02J3/28H02J3/38
CPCH02J3/02H02J3/12H02J3/28H02J3/381H02J3/388H02J2203/20H02J2310/64Y02B70/3225Y04S20/222
Inventor 王国华高明
Owner JIANGSU DAYBRIGHT INTELLIGENT ELECTRIC CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap