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A self-optimizing control method for microgrid groups considering grid-connected and island operation modes

A technology of microgrid group and operation mode, which is applied in the direction of AC network circuit, AC network voltage adjustment, single-grid parallel feeding arrangement, etc. Control and maintain the effect of frequency stability

Active Publication Date: 2022-04-29
ZHEJIANG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, a distributed hierarchical control method for a single microgrid has been proposed, but the research on applying distributed control to the microgrid group system has not been in-depth

Method used

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  • A self-optimizing control method for microgrid groups considering grid-connected and island operation modes
  • A self-optimizing control method for microgrid groups considering grid-connected and island operation modes
  • A self-optimizing control method for microgrid groups considering grid-connected and island operation modes

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Embodiment

[0265] The following takes a microgrid group as an example to demonstrate coordinated control:

[0266] The topology of the microgrid group system is as follows: Figure 4 As shown, it is composed of 3 microgrids. Each microgrid is composed of 3 distributed power sources, 1 optical storage system and 3 loads. The parameters of the microgrid group system are shown in Table 1 below. The cost coefficients are shown in Table 2 below.

[0267] Table 1: Parameters of the microgrid group system

[0268]

[0269]

[0270] Table 2: Cost coefficients of various distributed power sources

[0271] DG a / [$ / (kW·h) 2 ]

b / [$ / (kW·h)] c / ($ / h) DG1 0.020 0.20 0.0400 DG2 0.013 0.16 0.0140 DG3 0.010 0.10 0.0015 DG5 0.020 0.20 0.0400 DG6 0.013 0.16 0.0140 DG7 0.010 0.10 0.0015 DG9 0.020 0.20 0.0400 DG10 0.013 0.16 0.0140 DG11 0.010 0.10 0.0015

[0272] Scenario 1: Self-optimizing control of micro...

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Abstract

The invention discloses a microgrid group self-optimization control method considering grid-connected and island operation modes. The method first communicates based on a discrete consensus algorithm, and constructs a microgrid hierarchical control framework based on droop control; and then aims at In the microgrid island operation mode, construct the self-optimizing control model of each microgrid in the microgrid group system in the island mode; then consider the coordinated control among the microgrids of the microgrid group, and construct the microgrid group system in the microgrid system. The self-optimizing control model in the grid-connected mode; finally, through the micro-grid group coordination control algorithm, the stable and economical operation of the micro-grid group system and each micro-grid in the grid-connected and island operation modes is realized. The invention enables the microgrid to maintain the voltage stability and frequency stability of the microgrid in the grid-connected mode or the island mode by relying on a simple communication network, and realizes that each distributed power supply in the microgrid distributes output according to the principle of equal micro-increase rate Self-optimizing operation, and coordinated control of each microgrid in the microgrid group.

Description

technical field [0001] The invention belongs to the field of micro-grid group operation control and provides a micro-grid group self-optimization control method considering grid-connected and isolated island operation modes. Background technique [0002] Traditional microgrid control methods mainly include centralized control, distributed control and decentralized control. Among them, distributed control can realize hierarchical control while simplifying the communication network, so it is widely used. With the development of the autonomous microgrid structure, each microgrid can coordinate with each other to form a microgrid group system to achieve the goal of increasing the renewable energy consumption rate. In order to improve the reliability, stability, and economy of the operation of the microgrid group, the microgrid system not only needs to ensure the safety and stability of a single microgrid in grid-connected and isolated modes, but also reduce system operating cos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/48H02J3/24H02J3/12
CPCH02J3/381H02J3/388H02J3/48H02J3/241H02J3/12H02J2203/20H02J2300/20H02J2300/26Y02E10/56
Inventor 杨梓锋郭创新陈晓刚
Owner ZHEJIANG UNIV
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