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

AC/DC sub-microgrid control method and inter-sub-microgrid group control method

A control method and AC sub-technology, applied in AC network circuits, AC networks with energy trade/energy transmission authority, parallel operation of DC power supplies, etc. Unable to meet the needs of economic operation of AC/DC hybrid distribution network, to achieve the effect of meeting the needs of autonomy and stability, realizing economic distribution, and realizing economic operation

Active Publication Date: 2020-12-29
HUAZHONG UNIV OF SCI & TECH +2
View PDF4 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method does not consider the economic characteristics of the DG unit when performing power distribution, and cannot realize the economic control of the microgrid, and cannot meet the economic operation requirements of the AC / DC hybrid distribution network.

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
  • AC/DC sub-microgrid control method and inter-sub-microgrid group control method
  • AC/DC sub-microgrid control method and inter-sub-microgrid group control method
  • AC/DC sub-microgrid control method and inter-sub-microgrid group control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] This embodiment provides a method for controlling an AC sub-microgrid. refer to figure 2 , combined with Figure 5 , the method for controlling the AC sub-microgrid in this embodiment is described in detail, the method includes operation S1-operation S3.

[0044] Operation S1, using the cost micro-increment difference, frequency difference, node voltage difference and reactive power difference between any distributed power and every other distributed power, the cost micro-increment of any distributed power Increment, frequency, node voltage and reactive power are updated, and the difference between each updated value and the corresponding analog value is calculated to obtain cost micro-increment deviation, frequency deviation, node voltage deviation and reactive power deviation.

[0045] According to the principle of consistency control, each distributed power source in the AC sub-microgrid interacts with adjacent distributed power sources and updates the local contr...

Embodiment 2

[0092] This embodiment provides a DC sub-microgrid control method. refer to image 3 , combined with Figure 5 , the method for controlling the DC sub-microgrid in this embodiment will be described in detail. The method includes operation S1'-operation S3'.

[0093] Operation S1′, using the cost micro-increment difference and node voltage difference between any distributed power source and every other distributed power source, update the cost micro-increment and node voltage of any distributed power source respectively, And calculate the difference between each update value and the corresponding analog value, and obtain the cost micro-increment deviation and the node voltage deviation.

[0094] The operations performed on the cost micro-increment and the node voltage in operation S1' are the same as those performed on the cost micro-increment and the node voltage in Embodiment 1, and will not be repeated here. The updated cost increments and node voltages are:

[0095] ...

Embodiment 3

[0119] This embodiment provides a control method between sub-microgrid groups. refer to Figure 4 , combined with Figure 5 , to describe in detail the control method between sub-microgrid groups in this embodiment. The method includes operation S1"-operation S2".

[0120] Operate S1″, use the AC sub-microgrid control method to control each AC sub-microgrid in the sub-microgrid group, and use the DC sub-microgrid control method to control each DC sub-microgrid in the sub-microgrid group, the AC sub-microgrid The grid and the DC sub-microgrid are interconnected through one or more bidirectional converters.

[0121] In operation S1″, the control process of any AC sub-microgrid in the sub-microgrid group is the same as that of the AC sub-microgrid in Embodiment 1, and the control process of any DC sub-microgrid is the same as that of the DC sub-microgrid in Embodiment 2. The control process of the network is the same and will not be repeated here.

[0122] Further, the opera...

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 AC / DC sub-microgrid control method and an inter-sub-microgrid group control method, and belongs to the field of microgrid and power distribution network control. The methodcomprises the steps: introducing a cost micro-increment, a frequency, a node voltage and a reactive power distribution secondary adjustment item based on a discrete consistency protocol at an AC sub-microgrid control level, enabling each distributed power supply of the AC sub-microgrid to be distributed in an equal-cost micro-increment and reactive power proportion manner, and enabling the frequency and a common bus voltage to be recovered to reference values; in a DC sub-microgrid control level, introducing a cost micro-increment based on the discrete consistency protocol and a node voltage distribution secondary adjustment item so that the cost micro-increment of each distributed power supply of the DC sub-microgrid and the voltage of a common bus are recovered to the reference values; and in an inter-sub-microgrid cooperative control level, constructing a converter local control strategy based on a cost micro-increment deviation, and further introducing a secondary adjustment item based on discrete consistency to realize economic distribution of power among different sub-microgrids. And autonomous economic control in the sub-micro-grids and among the sub-micro-grids is realized.

Description

technical field [0001] The invention belongs to the field of micro-grid and distribution network control, and more specifically relates to a control method for AC and DC sub-micro-grids and a control method between sub-micro-grids. Background technique [0002] In recent years, the rapid development of distributed generation (DG) represented by photovoltaics and wind turbines has made the distribution network more green and environmentally friendly, and at the same time it has brought severe challenges to the safe and stable operation of the distribution network. As an effective means of receiving distributed power, microgrid has become an important way of grid-connected consumption of distributed power. The AC-DC hybrid distribution network composed of multiple AC and DC sub-microgrids has also received extensive attention. The economic control strategy of the AC-DC hybrid distribution network is divided into two parts: the internal control strategy of the sub-microgrid and...

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): H02J5/00H02J3/00H02J3/38H02J3/46H02J3/50H02J1/10G06Q50/06G06F30/20
CPCH02J5/00H02J3/008H02J3/381H02J3/466H02J3/50H02J1/10G06Q50/06G06F30/20G06F2113/04Y02P80/14
Inventor 杨炜晨梁志峰李淼苗世洪张世旭刘志伟汪鹏曹侃周鲲鹏叶畅王友怀胡晓峰伊华茂吴炼孙凌
Owner HUAZHONG UNIV OF SCI & TECH