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Microgrid active synchronous control method based on distributed control

A technology of distributed control and active synchronization, applied in the direction of single-network parallel feeding arrangement, etc., can solve the problems of high cost, low reliability, long communication lines, etc.

Inactive Publication Date: 2016-10-12
CENT SOUTH UNIV
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Problems solved by technology

However, the communication lines for centralized control are long, costly, and unreliable, and it is impractical to apply centralized control methods to network-type microgrids with distributed micro-sources with high penetration rates.
Therefore, the grid-connected synchronous control of microgrids with distributed micro-sources with high penetration is facing great challenges.

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  • Microgrid active synchronous control method based on distributed control
  • Microgrid active synchronous control method based on distributed control
  • Microgrid active synchronous control method based on distributed control

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Embodiment Construction

[0067] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings, but is not limited thereto.

[0068] figure 1 It is a schematic diagram of the topological structure of the microgrid using distributed communication in the present invention, including several distributed micro-sources DG, n busbars, transmission lines, loads, grid-connected switches 1030, synchronous controllers 1020, and communication networks. Among the several distributed micro-sources connected in parallel between them, connected to the bus through their respective feeders, the distributed micro-sources are divided into leader micro-sources 1012 and follower micro-sources 1011, the synchronous controller 1020 is used to generate synchronous control signals, and the communication network As a distributed communication network, the synchronization control signal generated by the synchronization controller 1020 is only transmitted to the l...

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Abstract

The invention discloses a microgrid active synchronous control method based on distributed control. The method is characterized in that through the distributed control technology, system busbar voltage of a microgrid is adjusted actively through local information interaction, thereby realizing smooth transition of the microgrid from an island operation mode to a grid-connected operation mode. A synchronous correction signal generated by a synchronous controller is only transmitted to a leader microsource; the leader microsource realizes information interaction with adjacent microsources; meanwhile, other microsources exchange information with adjacent microsources thereof; and finally, all of the microsources reach conformity behavior, that is, voltage and frequency are consistent, reactive power is allocated in proportion, and the microgrid system busbar voltage is synchronous with a large power grid, thereby realizing seamless grid connection. Compared with a conventional synchronous method, the method, based on local sparse communication, does not need a complex communication network, thereby reducing cost, and improving system reliability, flexibility and redundancy. Besides, even though a distributed communication network has fault, the bottom droop control can still keep normal operation of the system.

Description

technical field [0001] The invention relates to the technical fields of distributed power generation and micro-grid, in particular to an active synchronization control method for micro-grid based on distributed control. Background technique [0002] As an effective carrier of distributed power, the microgrid includes various forms of micro sources, energy storage devices, energy conversion devices, protection devices, and load monitoring equipment. It is a small power generation system capable of self-control, protection, and management. and grid-connected two operating modes. The proposal of the microgrid provides a new and effective way to improve the reliability of power supply in the power system, effectively utilize renewable energy, and reduce environmental pollution and power loss. [0003] Large power grid refers to large total capacity, large power supply coverage area, large number of power plants feeding power to the grid in various forms, high maximum voltage le...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/42
CPCH02J3/42
Inventor 钟朝露孙尧侯小超韩华粟梅于晶荣杨建陈英柳张杰
Owner CENT SOUTH UNIV
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