Microgrid transient performance intensification device and method based on cooperative control of fault current limit and quick energy storage

An energy storage device and fault current limiting technology, applied in the direction of AC network voltage adjustment, single-network parallel feeding arrangement, reducing/preventing power oscillation, etc., can solve the negative impact of micro-grid reliability and flexibility, situation differences, and Conform to the establishment of micro-grid and other issues, to achieve the effect of improving power quality level, restraining range, and ensuring safe and reliable operation

Active Publication Date: 2015-12-09
WUHAN UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The IEEE1547 standard stipulates the exit conditions for distributed power generation when the main grid fails, but after the distributed power generation is connected to the grid in the form of a microgrid, the situation is quite different.
If any external fault trig

Method used

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  • Microgrid transient performance intensification device and method based on cooperative control of fault current limit and quick energy storage
  • Microgrid transient performance intensification device and method based on cooperative control of fault current limit and quick energy storage
  • Microgrid transient performance intensification device and method based on cooperative control of fault current limit and quick energy storage

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Embodiment Construction

[0039] figure 1 Shown is a schematic structural diagram of a microgrid in an example application of the present invention. The selected microgrid contains DG units such as photovoltaic power generation and wind power generation, and each DG unit is connected to the microgrid system through an inverter device. Regarding the specific implementation of the current limiting-energy storage coordinated control method, the coordinated control involved in the present invention is described in detail by taking the magnetic flux coupling type superconducting fault current limiter and the superconducting magnetic energy storage device as the specific implementation objects. method.

[0040] figure 2 As shown, it is a structural schematic diagram of the selected fault current limiter in the example application of the present invention. This type of current limiter is a flux-coupled superconducting fault current limiter (superconducting fault current limiter, SFCL), which consists of a ...

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Abstract

The invention relates to a microgrid transient performance intensification device and method based on cooperative control of fault current limit and quick energy storage. The method comprises the following steps: a current limiter and a quick energy storage device are cooperatively controlled to promote fault crossing capability of a microgrid under some conditions, considering the difference among fault positions and interaction needs of a high penetration power when the microgrid encounters an external short circuit fault; the fault current limiter and the quick energy storage device are cooperatively controlled to ensure that the microgrid realizes smooth transition between a grid-connected mode and an island mode when such special conditions occur that as a microgrid link circuit is in short circuit, the microgrid must be disconnected from the main grid. The microgrid transient performance intensification device exerts positive effect on suppressing the microgrid power fluctuation and promoting electric energy quality so as to improve resistance capability of the microgrid to an external short circuit fault, and ensure the operation reliability of the microgrid.

Description

technical field [0001] The invention belongs to the field of electric power system and automation, and in particular relates to a micro-grid transient performance enhancement device and method based on fault current limiting-fast energy storage coordinated control, which is used to improve the robustness of high-permeability micro-grid against external short-circuit faults , to ensure its transient operation performance. Background technique [0002] Under the dual pressure of energy demand and environmental protection, both at home and abroad are focusing on the research field of distributed generation (DG) of renewable energy, and building a sustainable energy system has become the consensus and inevitable development trend of all countries. Existing research and practice results show that wind power generation, solar photovoltaic, fuel cell and other DGs connected to energy storage devices and loads to form a micro-grid operation can give full play to the efficiency and a...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/24H02J3/12
Inventor 陈磊雷雨
Owner WUHAN UNIV
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