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A kind of AC and DC sub-microgrid control method and control method between sub-microgrid groups

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: 2022-07-05
HUAZHONG UNIV OF SCI & TECH +2
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  • 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

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  • A kind of AC and DC sub-microgrid control method and control method between sub-microgrid groups
  • A kind of AC and DC sub-microgrid control method and control method between sub-microgrid groups
  • A kind of AC and DC sub-microgrid control method and control method between sub-microgrid groups

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Experimental program
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Embodiment 1

[0043] This embodiment provides an AC sub-microgrid control method. see figure 2 , combined with Figure 5 , the AC sub-microgrid control method in this embodiment is described in detail, and 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 source and every other distributed power source, to calculate the cost of any distributed power source slightly. 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 the 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 l...

Embodiment 2

[0092] This embodiment provides a DC sub-microgrid control method. see image 3 , combined with Figure 5 , the DC sub-microgrid control method in this embodiment is described in detail. The method includes operations 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, respectively update the cost micro-increment and node voltage of any distributed power source, And calculate the difference between each update value and the corresponding analog value, and obtain the cost micro-increment deviation and node voltage deviation.

[0094] The operations performed on the cost micro-increment and the node voltage in operation S1' are the same as the operations performed on the cost micro-increment and the node voltage in the first embodiment, and are not repeated here. The updated cost delta and node voltage are:

[0095]

[0096]

[00...

Embodiment 3

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

[0120] In operation S1", the AC sub-microgrid control method is used to control each AC sub-microgrid in the sub-microgrid group, and the DC sub-microgrid control method is used to control each DC sub-microgrid in the sub-microgrid group. 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 the first embodiment, and the control process of any DC sub-microgrid is the same as that of the DC sub-microgrid in the second embodiment. The control process of the network is the same and will not be repeated here.

[0122] Further, operation S1...

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Abstract

The invention discloses an AC and DC sub-micro-grid control method and a control method between sub-micro-grid groups, belonging to the field of micro-grid and distribution network control. The secondary adjustment items of micro-increment, frequency, node voltage and reactive power distribution make the cost of each distributed power source in the AC sub-microgrid micro-increment, the reactive power is distributed proportionally, and the frequency and common bus voltage return to the reference value; At the microgrid control level, the cost micro-increment based on the discrete consistency protocol and the secondary adjustment item for node voltage distribution are introduced, so that the cost of each distributed power source in the DC sub-microgrid is micro-incremented, and the common bus voltage is restored to the reference value; At the collaborative control level between microgrids, a local control strategy of the converter is constructed based on the cost micro-incremental deviation, and a secondary adjustment term based on discrete consistency is further introduced to realize the economical distribution of power among different sub-microgrids. Realize autonomous economic control within and between sub-micro-grids.

Description

technical field [0001] The invention belongs to the field of micro-grid and distribution network control, and more particularly relates to an AC and DC sub-micro-grid control method and a control method between sub-micro-grid groups. 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, but also brought serious challenges to the safe and stable operation of the distribution network. As an effective means of accepting distributed power, microgrid has become an important way of grid-connected consumption of distributed power. 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 the control strategy between the sub-microgrid groups, so as to realize the autonomous stability and power economic distribution within ea...

Claims

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Application Information

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Patent Type & Authority Patents(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